CN111165273B - Culture method and culture medium for high-yield selenium-rich cordyceps militaris - Google Patents

Culture method and culture medium for high-yield selenium-rich cordyceps militaris Download PDF

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CN111165273B
CN111165273B CN202010118155.0A CN202010118155A CN111165273B CN 111165273 B CN111165273 B CN 111165273B CN 202010118155 A CN202010118155 A CN 202010118155A CN 111165273 B CN111165273 B CN 111165273B
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cordyceps militaris
culture medium
culturing
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CN111165273A (en
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姬晓娜
谢朝晖
鲁铁
廖春丽
高建民
李冰冰
江行
连林地
孙冰冰
任宇翔
孙琳萱
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Chen Dong
Chen Xiaoyun
Chen Zhifeng
Ma Wenjun
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Henan University of Urban Construction
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G18/00Cultivation of mushrooms
    • A01G18/20Culture media, e.g. compost
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G18/00Cultivation of mushrooms
    • A01G18/40Cultivation of spawn
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G18/00Cultivation of mushrooms
    • A01G18/50Inoculation of spawn
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G18/00Cultivation of mushrooms
    • A01G18/60Cultivation rooms; Equipment therefor
    • A01G18/69Arrangements for managing the environment, e.g. sprinklers

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  • Environmental Sciences (AREA)
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Abstract

The invention belongs to the technical field of biology, and particularly relates to a method for culturing high-yield selenium-rich cordyceps militaris, which comprises the following steps: s1, plate culture; s2, liquid fermentation culture; s3, hypha culture; s4, color conversion culture; s5, culturing stroma; s6, culturing sporocarp. The invention also provides a liquid fermentation culture medium and a solid culture medium for high-yield selenium-rich cordyceps militaris. The invention improves the output, selenium content and adenosine content of the cordyceps militaris.

Description

Culture method and culture medium for high-yield selenium-rich cordyceps militaris
Technical Field
The invention belongs to the technical field of biology, and particularly relates to a culture method and a culture medium for high-yield selenium-rich cordyceps militaris.
Background
Cordyceps militaris (Cordyceps militaris) also called Cordyceps militaris and Cordyceps militaris, belong to the phylum Eumycota, Ascomycotina, Pyrenomycetes, Clavicipitales, Clavipitaceae, genus Cordyceps, are heterogeneous with Cordyceps sinensis, and are the model species of Cordyceps genus. A large number of researches show that the pharmacological action of cordyceps militaris is very similar to that of cordyceps sinensis, the content and SOD activity of medicinal components of cordycepic acid, cordyceps polysaccharide, cordycepin and the like are higher than those of the cordyceps sinensis, and the cordyceps militaris and cordyceps militaris and cordyceps militaris extract has the effects of resisting tumors, resisting fatigue, reducing blood sugar, resisting bacteria, diminishing inflammation, improving immunity, tonifying lung yin, kidney yang, treating kidney deficiency and the like, and has obvious curative effects on chronic bronchitis and pulmonary heart disease of the old.
The Cordyceps militaris has a relatively wide host range, but has low specificity, is mainly parasitic on larvae, imagoes and pupae of insects such as Lepidoptera, Diptera and Coleoptera, mainly Lepidoptera, and is divided into 11 families of 3 meshes and 19 families. Cordyceps militaris is mainly distributed in tropical and subtropical areas and cold and warm climatic zones. The distribution is more in france, germany, the united kingdom in europe and the united states and canada in north america; the natural resources in China are rich and are found in provinces such as Liaoning, Shaanxi, Shanxi, Anhui, Sichuan, Guizhou, Yunnan, Hubei, Hunan, Jilin, Henan, Guangdong, Guangxi, Shandong, Jiangsu, Gansu and Fujian. Cordyceps militaris grows mainly in the middle and shallow mountains with sufficient sunlight and high humidity, and the stroma is usually differentiated in late summer and early autumn every year.
Selenium is an indispensable trace element in human body, can remove excessive oxygen free radicals in human body, effectively prevents the selenium element from being destroyed by lipid peroxidation of cell membranes, is a trace element necessary for human body, and has physiological functions of oxidation resistance and aging resistance. Based on the medicinal value of cordyceps militaris and the importance of selenium to human bodies, the artificial culture of selenium-rich cordyceps militaris is of great significance.
The application publication date is 2018, 7 and 20, and the application publication number is CN108300667A, which discloses a method for fermentation culture of selenium-rich cordyceps militaris, and the method comprises the steps of adding inorganic selenium and phosphate into a culture medium when the pH of the culture medium of selenium-rich fermented cordyceps militaris hyphae is 8; provided that the inorganic selenium and the phosphate are not added simultaneously. The invention avoids the adverse effect in the fermentation culture of the cordyceps militaris by effectively applying phosphate and sulfate, improves the enrichment efficiency and ensures the safety of the product.
The invention discloses a Chinese patent with an authorization notice date of 2019, 7 and 26 and an authorization notice number of CN106544277B, which discloses a method for preparing cordyceps militaris sporocarp products, and comprises the following steps: (a1) culturing Cordyceps militaris strains by using a seed strengthening culture medium to obtain a seed strengthening culture; (a2) inoculating the seed enhanced culture obtained in the step (a1) into a liquid seed culture medium for culture to obtain liquid seeds; (a3) inoculating the liquid seeds obtained in the step (a2) to a selenium-rich culture medium of the sporocarp for culture to obtain the cordyceps militaris sporocarp. The invention utilizes the selenium-rich yeast powder as an organic nitrogen source for culturing the cordyceps militaris strain sporocarp and provides a selenium source, thereby improving the utilization rate and the absorption rate of selenium and greatly enhancing the selenium content in the sporocarp.
The application publication date is 2018, 12 and 7, and the application publication number is CN108934781A, which discloses a high-yield culture medium for selenium-rich cordyceps militaris, and the culture medium comprises: silkworm chrysalis, glucose, buckwheat bran, peptone, phosphate, inorganic selenium, selenium-rich vinasse, selenium-rich yeast, vitamin B complex and water.
The technical schemes disclosed above all have a certain effect of increasing the selenium content in cordyceps militaris, but the selenium content and the yield are not ideal.
Disclosure of Invention
The invention provides a culture method of high-yield selenium-rich cordyceps militaris, which is used for improving the yield, selenium content and adenosine content of the cordyceps militaris.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for culturing high-yield selenium-rich cordyceps militaris is characterized by comprising the following steps:
s1, plate culture: inoculating the cordyceps militaris strain to a PDA culture medium, and culturing for 12-18 days at 18-25 ℃;
s2, liquid fermentation culture: inoculating the strains with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture for 7-15 days at the temperature of 20-28 ℃ and at the speed of 120-180 r/min to obtain liquid strains;
s3, hypha culture: inoculating the liquid strain to a solid culture medium according to the weight ratio of 8-14%, and culturing for 4-12 days at the temperature of 15-25 ℃ under the conditions of light protection, no oxygen and air relative humidity of 50-75% to obtain hyphae;
s4, color conversion culture: culturing the hyphae for 7-12 days under the conditions that the temperature is 16-25 ℃, the illumination intensity is 150-300 Lx, the illumination time is 10-16 h/d, and the relative humidity of air is 70-90%;
s5, stroma culture: culturing the color-transfer cultured hyphae for 8-18 days under the conditions that the temperature is 18-25 ℃, the illumination intensity is 200-400 Lx, the illumination time is 6-12 h/d, ventilation is carried out for 20-30 min every 4-6 h, and the relative air humidity is 75-95% to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing the fruiting body for 30-40 days under the conditions that the temperature is 19-28 ℃, the illumination intensity is 200-400 Lx, the illumination time is 6-12 h/d, ventilation is kept, and the relative humidity of air is 75-90%.
In the method for culturing high-yield selenium-rich cordyceps militaris provided by the invention, preferably, the liquid fermentation medium is mainly prepared from the following raw materials in percentage by weight: 2-8% of glucose, 0.1-0.6% of monopotassium phosphate, 0.03-0.3% of magnesium sulfate, 0.6-1.9% of peptone, 2-7% of yeast extract, 0-0.009% of vitamin B10.001 and the balance of water.
In the method for culturing high-yield selenium-rich cordyceps militaris provided by the invention, preferably, the solid culture medium is prepared from the following raw materials in parts by weight: 30-80 parts of rice, 5-15 parts of sorghum, 3-14 parts of bran, 0.1-0.6 part of monopotassium phosphate, 0.03-0.25 part of magnesium sulfate, 1-5 parts of cane sugar, 0.1-0.8 part of peptone, 0.2-2.0 parts of yeast powder, 0. 10.001-0.008 part of vitamin B and 80-170 parts of water, and meanwhile, the solid culture medium further comprises 0.1-2.5 parts of selenium yeast or 0.1-2.5 parts of sodium selenite.
In the method for culturing high-yield selenium-rich cordyceps militaris provided by the invention, preferably, the liquid fermentation medium further comprises the following raw materials in percentage by weight: 0.05-0.2% of ginkgo leaf extract.
In the culture method of high-yield selenium-rich cordyceps militaris provided by the invention, more preferably, the solid culture medium further comprises the following raw materials in parts by weight: 0.01 to 0.15 portion of tabasheer.
On the other hand, the technical problem to be solved by the invention is to provide a liquid fermentation medium and a solid culture medium for culturing cordyceps militaris, which are used for improving the yield and the selenium content of the cordyceps militaris.
The liquid fermentation medium is mainly prepared from the following raw materials in percentage by weight: 2-8% of glucose, 0.1-0.6% of monopotassium phosphate, 0.03-0.3% of magnesium sulfate, 0.6-1.9% of peptone, 2-7% of yeast extract, 0-0.009% of vitamin B10.001 and the balance of water. Preferably, the liquid fermentation medium is mainly prepared from the following raw materials in percentage by weight: 2-4% of glucose, 0.15-0.3% of monopotassium phosphate, 0.05-0.1% of magnesium sulfate, 0.6-1.2% of peptone, 2-4% of yeast extract, 10.002-0.004% of vitamin B and the balance of water. Further preferably, the liquid fermentation medium is mainly prepared from the following raw materials in percentage by weight: 3% of glucose, 0.3% of potassium dihydrogen phosphate, 0.08% of magnesium sulfate, 1% of peptone, 2.5% of yeast, vitamin B10.003% and the balance of water.
In the liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris provided by the invention, the liquid fermentation culture medium preferably further comprises the following raw materials in percentage by weight: 0.05-0.2% of ginkgo leaf extract.
The solid culture medium is mainly prepared from the following raw materials in parts by weight: 30-80 parts of rice, 5-15 parts of sorghum, 3-14 parts of bran, 0.1-0.6 part of monopotassium phosphate, 0.03-0.25 part of magnesium sulfate, 1-5 parts of cane sugar, 0.1-0.8 part of peptone, 0.2-2.0 parts of yeast powder, 0. 10.001-0.008 part of vitamin B and 80-170 parts of water, and meanwhile, the solid culture medium further comprises 0.1-2.5 parts of selenium yeast or 0.1-2.5 parts of sodium selenite. Preferably, the solid culture medium is mainly prepared from the following raw materials in parts by weight: 40-60 parts of rice, 5-8 parts of sorghum, 5-8 parts of bran, 0.1-0.2 part of monopotassium phosphate, 0.05-0.1 part of magnesium sulfate, 1.25-2.5 parts of cane sugar, 0.2-0.4 part of peptone, 0.5-1.0 part of yeast powder and 10.002-0.004 part of vitamin B, and meanwhile, the solid culture medium further comprises 0.25-1.5 parts of selenium yeast or 0.25-1.5 parts of sodium selenite. Further preferably, the solid medium is mainly prepared from the following raw materials in parts by weight: 52 parts of rice, 7 parts of sorghum, 6 parts of bran, 0.1 part of monopotassium phosphate, 0.07 part of magnesium sulfate, 1.5 parts of cane sugar, 0.35 part of peptone, 0.7 part of yeast powder and 0.78 part of vitamin B10.003, and meanwhile, the solid culture medium further comprises 0.6 part of selenium yeast or 0.6 part of sodium selenite.
In the solid culture medium for high-yield selenium-rich cordyceps militaris provided by the invention, the solid culture medium preferably further comprises the following raw materials in parts by weight: 0.01 to 0.15 portion of tabasheer.
Concretio silicea Bambusae seu Schizostachyi is dried block of secretion in stem of Gramineae plant such as Bambusa textilis McClure or Schiostachiyum chinensis Rendle. In the present invention, the concretio silicea bambusae is ground into powder for use.
Compared with the prior art, the invention has the following beneficial technical effects:
the temperature adopted in the hypha culture stage is 15-25 ℃, the light is protected, the oxygen is not contained, the relative humidity of air is 50-75%, the temperature adopted in the color transfer culture stage is 16-25 ℃, the illumination intensity is 150-300 Lx, the illumination time is 10-16 h/d, the oxygen is not contained, the relative humidity of air is 70-90%, the temperature adopted in the stroma culture stage is 16-25 ℃, the illumination intensity is 150-300 Lx, the illumination time is 10-16 h/d, the oxygen is not contained, the relative humidity of air is 70-90%, the temperature adopted in the sporophore culture stage is 19-28 ℃, the illumination intensity is 200-400 Lx, the illumination time is 6-12 h/d, the ventilation is kept, and the relative humidity of air is 75-90%, so that the cordyceps militaris has good growth vigor.
The wheat bran added into the solid culture medium has the effects of increasing the yield of cordyceps militaris, enabling fruiting bodies to grow sturdy and enabling color and luster to be better, and the ginkgo leaf extract added into the liquid fermentation culture medium has the effect of further increasing the yield of cordyceps militaris. The yield of the cordyceps militaris reaches more than 60.6 g/bottle.
The concretio silicea bambusae is added into the solid culture medium to promote the enrichment of selenium element in cordyceps militaris, and the glossy privet fruit is added into the solid culture medium to further promote the enrichment of selenium element in cordyceps militaris, wherein the selenium content of cordyceps militaris reaches over 19.319mg/kg and is up to 29.553 mg/kg.
The adenosine content of the cordyceps militaris reaches 2.15 mg/g. The ginkgo leaf extract is added into the liquid fermentation culture medium and the tabasheer is added into the solid culture medium, so that the synergistic effect is realized on the improvement of the adenosine content of the cordyceps militaris, and the adenosine content is up to 3.19 mg/g.
Drawings
FIG. 1 is a bar graph of the average output, average selenium content and average adenosine content of each group of Cordyceps militaris in the present invention;
FIG. 2 is a bar graph of the average output of each group of Cordyceps militaris in the present invention;
FIG. 3 is a bar graph of the average selenium content of each group of Cordyceps militaris in the present invention;
FIG. 4 is a bar graph of the average adenosine content of each group of Cordyceps militaris in the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.2kg of glucose, 0.06kg of monopotassium phosphate, 0.003kg of magnesium sulfate, 0.06kg of peptone, 0.7kg of yeast extract and 10.0001kg of vitamin B, and water is added to make up 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 30 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 8kg of rice, 0.5kg of sorghum, 1.4kg of bran, 0.01kg of monopotassium phosphate, 0.003kg of magnesium sulfate, 0.5kg of sucrose, 0.01kg of peptone, 0.02kg of yeast powder, 10kg of vitamin B10.0008 kg of water and 0.25kg of selenium yeast. Uniformly mixing rice, sorghum, monopotassium phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1 and selenium yeast, adding water, soaking for 20 hours, adding bran, uniformly mixing, and subpackaging into 1L culture bottles, wherein 200g of each culture bottle is filled. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 18 deg.C for 18 days;
s2, liquid fermentation culture: inoculating the strains with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and carrying out constant-temperature shaking culture for 15 days at the temperature of 20 ℃ and at the speed of 180r/min to obtain liquid strains; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated onto the solid medium at a weight ratio of 8, that is, 16g of liquid seed culture was inoculated into each flask. Culturing at 15 deg.C under dark conditions without oxygen and with relative air humidity of 75% for 12 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 25 deg.C under illumination intensity of 300Lx for 10h/d for 7 days in the absence of oxygen and relative air humidity of 70%;
s5, stroma culture: culturing the color-changed mycelium for 8 days under the conditions of 25 ℃ of temperature, 200Lx of illumination intensity, 12h/d of illumination time, ventilation for 30min every 6h and 95% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 19 deg.C under illumination intensity of 400Lx for 12h/d for 300 days under ventilation and relative air humidity of 90% to obtain selenium-rich Cordyceps militaris.
Example 2
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.8kg of glucose, 0.01kg of monopotassium phosphate, 0.03kg of magnesium sulfate, 0.19kg of peptone, 0.2kg of yeast extract and 10.0009kg of vitamin B, and water is added to make up for 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 3kg of rice, 1.5kg of sorghum, 0.3kg of bran, 0.06kg of monopotassium phosphate, 0.025kg of magnesium sulfate, 0.1kg of sucrose, 0.08kg of peptone, 0.2kg of yeast powder, 10.0001kg of vitamin B, 8kg of water and 0.01kg of sodium selenite. Uniformly mixing rice, sorghum, monopotassium phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1 and sodium selenite, adding water, soaking for 10 hours, adding bran, uniformly mixing, and subpackaging into 1L culture bottles, wherein 200g of each culture bottle is filled. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 25 deg.C for 12 days;
s2, liquid fermentation culture: inoculating the strain with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and carrying out constant-temperature shaking culture for 7 days at the temperature of 28 ℃ and at the speed of 120r/min to obtain a liquid strain; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated onto the solid medium at a ratio of 14% by weight, that is, 28g of the liquid seed culture was inoculated into each flask. Culturing at 25 deg.C under dark condition and without oxygen and with relative air humidity of 50% for 4 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 16 deg.C under illumination intensity of 150Lx for 16h/d for 12 days in the absence of oxygen and relative air humidity of 90%;
s5, stroma culture: culturing the color-transfer cultured mycelia for 18 days under the conditions of 18 ℃ of temperature, 400Lx of illumination intensity, 6h/d of illumination time, ventilation for 20min every 4h and 75% of relative air humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 28 deg.C under illumination intensity of 200Lx for 6h/d under ventilation and air relative humidity of 75% for 40 days to obtain selenium-rich Cordyceps militaris.
Example 3
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.3kg of glucose, 0.03kg of monopotassium phosphate, 0.008kg of magnesium sulfate, 0.1kg of peptone, 0.25kg of yeast extract and 10.0003kg of vitamin B, and water is added to make up 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 5.2kg of rice, 0.7kg of sorghum, 0.6kg of bran, 0.01kg of monopotassium phosphate, 0.007kg of magnesium sulfate, 0.15kg of cane sugar, 0.035kg of peptone, 0.07kg of yeast powder, 13kg of vitamin B10.0003 kg of water and 0.125kg of sodium selenite. Uniformly mixing rice, sorghum, monopotassium phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1 and sodium selenite, adding water, soaking for 12 hours, adding bran, uniformly mixing, and subpackaging into 1L culture bottles, wherein 200g of each culture bottle is filled. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 23 deg.C for 15 days;
s2, liquid fermentation culture: inoculating the strain with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture at 25 ℃ for 10 days at 170r/min to obtain a liquid strain; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated to the solid medium at a ratio of 10% by weight, that is, 20g of the liquid seed culture was inoculated into each flask. Culturing at 20 deg.C under dark and oxygen-free conditions with relative air humidity of 70% for 8 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 23 deg.C under illumination intensity of 280Lx for 12h/d for 10 days in the absence of oxygen and relative air humidity of 80%;
s5, stroma culture: culturing the color-changed mycelium for 14 days under the conditions of 22 ℃ of temperature, 360Lx of illumination intensity, 8h/d of illumination time, ventilation for 25min every 5h and 85% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 28 deg.C under illumination intensity of 380Lx for 10h/d, ventilation and relative air humidity of 85% for 35 days to obtain selenium-rich Cordyceps militaris.
Example 4
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.3kg of glucose, 0.03kg of monopotassium phosphate, 0.008kg of magnesium sulfate, 0.1kg of peptone, 0.25kg of yeast extract, 0.0003kg of vitamin B and 0.005kg of ginkgo leaf extract, and adding water to make up for 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 5.2kg of rice, 0.7kg of sorghum, 0.6kg of bran, 0.01kg of monopotassium phosphate, 0.007kg of magnesium sulfate, 0.15kg of cane sugar, 0.035kg of peptone, 0.07kg of yeast powder, 13kg of vitamin B10.0003 kg of water and 0.125kg of sodium selenite. Uniformly mixing rice, sorghum, monopotassium phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1 and sodium selenite, adding water, soaking for 12 hours, adding bran, uniformly mixing, and subpackaging into 1L culture bottles, wherein 200g of each culture bottle is filled. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 23 deg.C for 15 days;
s2, liquid fermentation culture: inoculating the strain with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture at 25 ℃ for 10 days at 170r/min to obtain a liquid strain; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated to the solid medium at a ratio of 10% by weight, that is, 20g of the liquid seed culture was inoculated into each flask. Culturing at 20 deg.C under dark and oxygen-free conditions with relative air humidity of 70% for 8 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 23 deg.C under illumination intensity of 280Lx for 12h/d for 10 days in the absence of oxygen and relative air humidity of 80%;
s5, stroma culture: culturing the color-changed mycelium for 14 days under the conditions of 22 ℃ of temperature, 360Lx of illumination intensity, 8h/d of illumination time, ventilation for 25min every 5h and 85% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 28 deg.C under illumination intensity of 380Lx for 10h/d, ventilation and relative air humidity of 85% for 35 days to obtain selenium-rich Cordyceps militaris.
Example 5
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.3kg of glucose, 0.03kg of monopotassium phosphate, 0.008kg of magnesium sulfate, 0.1kg of peptone, 0.25kg of yeast extract and 10.0003kg of vitamin B, and water is added to make up 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 5.2kg of rice, 0.7kg of sorghum, 0.6kg of bran, 0.01kg of monopotassium phosphate, 0.007kg of magnesium sulfate, 0.15kg of cane sugar, 0.035kg of peptone, 0.07kg of yeast powder, 0.0003kg of vitamin B10, 0.001kg of tabasheer, 13kg of water and 0.125kg of sodium selenite. Mixing rice, sorghum, potassium dihydrogen phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1, tabasheer and sodium selenite uniformly, adding water, soaking for 12 hr, adding bran, mixing uniformly, and packaging into 1L culture bottles, wherein each culture bottle contains 200 g. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 23 deg.C for 15 days;
s2, liquid fermentation culture: inoculating the strain with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture at 25 ℃ for 10 days at 170r/min to obtain a liquid strain; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated to the solid medium at a ratio of 10% by weight, that is, 20g of the liquid seed culture was inoculated into each flask. Culturing at 20 deg.C under dark and oxygen-free conditions with relative air humidity of 70% for 8 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 23 deg.C under illumination intensity of 280Lx for 12h/d for 10 days in the absence of oxygen and relative air humidity of 80%;
s5, stroma culture: culturing the color-changed mycelium for 14 days under the conditions of 22 ℃ of temperature, 360Lx of illumination intensity, 8h/d of illumination time, ventilation for 25min every 5h and 85% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 28 deg.C under illumination intensity of 380Lx for 10h/d, ventilation and relative air humidity of 85% for 35 days to obtain selenium-rich Cordyceps militaris.
Example 6
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.3kg of glucose, 0.03kg of monopotassium phosphate, 0.008kg of magnesium sulfate, 0.1kg of peptone, 0.25kg of yeast extract, 0.0003kg of vitamin B and 0.005kg of ginkgo leaf extract, and adding water to make up for 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 5.2kg of rice, 0.7kg of sorghum, 0.6kg of bran, 0.01kg of monopotassium phosphate, 0.007kg of magnesium sulfate, 0.15kg of cane sugar, 0.035kg of peptone, 0.07kg of yeast powder, 0.0003kg of vitamin B10, 0.001kg of tabasheer, 13kg of water and 0.125kg of sodium selenite. Mixing rice, sorghum, potassium dihydrogen phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1, tabasheer and sodium selenite uniformly, adding water, soaking for 12 hr, adding bran, mixing uniformly, and packaging into 1L culture bottles, wherein each culture bottle contains 200 g. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 23 deg.C for 15 days;
s2, liquid fermentation culture: inoculating the strain with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture at 25 ℃ for 10 days at 170r/min to obtain a liquid strain; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated to the solid medium at a ratio of 10% by weight, that is, 20g of the liquid seed culture was inoculated into each flask. Culturing at 20 deg.C under dark and oxygen-free conditions with relative air humidity of 70% for 8 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 23 deg.C under illumination intensity of 280Lx for 12h/d for 10 days in the absence of oxygen and relative air humidity of 80%;
s5, stroma culture: culturing the color-changed mycelium for 14 days under the conditions of 22 ℃ of temperature, 360Lx of illumination intensity, 8h/d of illumination time, ventilation for 25min every 5h and 85% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 28 deg.C under illumination intensity of 380Lx for 10h/d, ventilation and relative air humidity of 85% for 35 days to obtain selenium-rich Cordyceps militaris.
Example 7
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.3kg of glucose, 0.03kg of monopotassium phosphate, 0.008kg of magnesium sulfate, 0.1kg of peptone, 0.25kg of yeast extract, 0.0003kg of vitamin B and 0.005kg of ginkgo leaf extract, and adding water to make up for 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 5.2kg of rice, 0.7kg of sorghum, 0.6kg of bran, 0.01kg of monopotassium phosphate, 0.007kg of magnesium sulfate, 0.15kg of cane sugar, 0.035kg of peptone, 0.07kg of yeast powder, 0.0003kg of vitamin B10, 0.001kg of tabasheer, 0.05kg of glossy privet fruit, 13kg of water and 0.125kg of sodium selenite. Uniformly mixing rice, sorghum, monopotassium phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1, tabasheer, glossy privet fruit and sodium selenite, adding water, soaking for 12 hours, adding bran, uniformly mixing, and subpackaging into 1L culture bottles, wherein 200g of each culture bottle is filled. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 23 deg.C for 15 days;
s2, liquid fermentation culture: inoculating the strain with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture at 25 ℃ for 10 days at 170r/min to obtain a liquid strain; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated to the solid medium at a ratio of 10% by weight, that is, 20g of the liquid seed culture was inoculated into each flask. Culturing at 20 deg.C under dark and oxygen-free conditions with relative air humidity of 70% for 8 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 23 deg.C under illumination intensity of 280Lx for 12h/d for 10 days in the absence of oxygen and relative air humidity of 80%;
s5, stroma culture: culturing the color-changed mycelium for 14 days under the conditions of 22 ℃ of temperature, 360Lx of illumination intensity, 8h/d of illumination time, ventilation for 25min every 5h and 85% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 28 deg.C under illumination intensity of 380Lx for 10h/d, ventilation and relative air humidity of 85% for 35 days to obtain selenium-rich Cordyceps militaris.
Example 8
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.3kg of glucose, 0.03kg of monopotassium phosphate, 0.008kg of magnesium sulfate, 0.1kg of peptone, 0.25kg of yeast extract, 0.0003kg of vitamin B and 0.02kg of ginkgo biloba extract, and adding water to make up for 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 5.2kg of rice, 0.7kg of sorghum, 0.6kg of bran, 0.01kg of monopotassium phosphate, 0.007kg of magnesium sulfate, 0.15kg of cane sugar, 0.035kg of peptone, 0.07kg of yeast powder, 0.0003kg of vitamin B10, 0.015kg of tabasheer, 0.08kg of glossy privet fruit, 13kg of water and 0.25kg of selenium yeast. Uniformly mixing rice, sorghum, monopotassium phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1, tabasheer, glossy privet fruit and selenium yeast, adding water, soaking for 12 hours, adding bran, uniformly mixing, and subpackaging into 1L culture bottles, wherein 200g of each culture bottle is filled. Then sterilizing the subpackaged solid culture medium for 20min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 19 deg.C for 17 days;
s2, liquid fermentation culture: inoculating the strains with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and carrying out constant-temperature shaking culture for 14 days at the temperature of 23 ℃ at 140r/min to obtain liquid strains; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated to the solid medium at a ratio of 12% by weight, that is, 24g of the liquid seed culture was inoculated into each flask. Culturing at 24 deg.C under dark conditions without oxygen and with relative air humidity of 65% for 10 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 24 deg.C under illumination intensity of 270Lx for 14h/d in the absence of oxygen and relative air humidity of 80% for 11 days;
s5, stroma culture: culturing the color-transfer cultured mycelia for 14 days under the conditions of 20 ℃ of temperature, 370Lx of illumination intensity, 10h/d of illumination time, ventilation for 25min every 5h and 80% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 25 deg.C under illumination intensity of 390Lx for 10h/d, ventilation and air relative humidity of 80% for 37 days to obtain selenium-rich Cordyceps militaris.
Comparative example 1
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.3kg of glucose, 0.03kg of monopotassium phosphate, 0.008kg of magnesium sulfate, 0.1kg of peptone, 0.25kg of yeast extract and 10.0003kg of vitamin B, and water is added to make up 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 5.2kg of rice, 0.7kg of sorghum, 0.6kg of bran, 0.01kg of monopotassium phosphate, 0.007kg of magnesium sulfate, 0.15kg of cane sugar, 0.035kg of peptone, 0.07kg of yeast powder, 0.0003kg of vitamin B10 and 13kg of water. Uniformly mixing rice, sorghum, monopotassium phosphate, magnesium sulfate, sucrose, peptone, yeast powder and vitamin B1, adding water, soaking for 12 hours, adding bran, uniformly mixing, and subpackaging into 1L culture bottles, wherein 200g is filled in each culture bottle. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 23 deg.C for 15 days;
s2, liquid fermentation culture: inoculating the strain with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture at 25 ℃ for 10 days at 170r/min to obtain a liquid strain; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated to the solid medium at a ratio of 10% by weight, that is, 20g of the liquid seed culture was inoculated into each flask. Culturing at 20 deg.C under dark and oxygen-free conditions with relative air humidity of 70% for 8 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 23 deg.C under illumination intensity of 280Lx for 12h/d for 10 days in the absence of oxygen and relative air humidity of 80%;
s5, stroma culture: culturing the color-changed mycelium for 14 days under the conditions of 22 ℃ of temperature, 360Lx of illumination intensity, 8h/d of illumination time, ventilation for 25min every 5h and 85% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 28 deg.C under illumination intensity of 380Lx for 10h/d, ventilation and relative air humidity of 85% for 35 days to obtain selenium-rich Cordyceps militaris.
Comparative example 2
A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 0.3kg of glucose, 0.03kg of monopotassium phosphate, 0.008kg of magnesium sulfate, 0.1kg of peptone, 0.25kg of yeast extract and 10.0003kg of vitamin B, and water is added to make up 10 kg. The raw materials are fully dissolved in water and then are subpackaged into 1L triangular bottles, and each triangular bottle is subpackaged with 300 mL. Sterilizing the liquid fermentation culture medium at 121 deg.C under 0.105MPa for 25 min. And cooling for later use.
A solid culture medium for high-yield selenium-rich cordyceps militaris is prepared from the following raw materials: 5.2kg of rice, 0.7kg of sorghum, 0.01kg of monopotassium phosphate, 0.007kg of magnesium sulfate, 0.15kg of cane sugar, 0.035kg of peptone, 0.07kg of yeast powder, 13kg of vitamin B10.0003 kg of water and 0.125kg of sodium selenite. Mixing rice, sorghum, potassium dihydrogen phosphate, magnesium sulfate, sucrose, peptone, yeast powder, vitamin B1 and sodium selenite uniformly, adding water, soaking for 12 hr, and packaging into 1L culture bottles, wherein 200g is filled in each culture bottle. Then sterilizing the subpackaged solid culture medium for 30min under the conditions of pressure of 0.105MPa and temperature of 121 ℃. And cooling for later use.
A method for culturing high-yield selenium-rich Cordyceps militaris comprises the following steps:
s1, plate culture: inoculating Cordyceps militaris strain to PDA culture medium, and culturing at 23 deg.C for 15 days;
s2, liquid fermentation culture: inoculating the strain with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture at 25 ℃ for 10 days at 170r/min to obtain a liquid strain; the clumps were broken up using a magnetic stirrer to distribute the strains evenly.
S3, hypha culture: the liquid seed culture was inoculated to the solid medium at a ratio of 10% by weight, that is, 20g of the liquid seed culture was inoculated into each flask. Culturing at 20 deg.C under dark and oxygen-free conditions with relative air humidity of 70% for 8 days to obtain mycelium;
s4, color conversion culture: culturing the mycelium at 23 deg.C under illumination intensity of 280Lx for 12h/d for 10 days in the absence of oxygen and relative air humidity of 80%;
s5, stroma culture: culturing the color-changed mycelium for 14 days under the conditions of 22 ℃ of temperature, 360Lx of illumination intensity, 8h/d of illumination time, ventilation for 25min every 5h and 85% of air relative humidity to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing fruiting body at 28 deg.C under illumination intensity of 380Lx for 10h/d, ventilation and relative air humidity of 85% for 35 days to obtain selenium-rich Cordyceps militaris.
In the present invention, the glossy privet fruit is a dried ripe fruit of Ligustrum lucidum Ait (Ligustrum lucidum Ait.) belonging to Oleaceae. Harvesting in winter, removing branches and leaves, and pulverizing.
Test examples
In order to verify the beneficial technical effects of the invention, the following tests are specially carried out:
cordyceps militaris cultures were performed according to the methods of examples 1 to 8, comparative example 1 and comparative example 2, and the yield, selenium content, adenosine content, shape and color of Cordyceps militaris were examined (100 bottles of samples were randomly drawn from each test group), and the results are shown in Table 1.
1. The selenium content was determined by the first method (hydride atomic fluorescence spectrometry) of GB 5009.93-2017.
2. The adenosine content was measured by the method of "content measurement" of Cordyceps sinensis in the first part of the "Chinese pharmacopoeia" 2015 edition.
Table 1. output, selenium content, adenosine content, shape and color of each group of Cordyceps militaris
Figure BDA0002392122630000241
Figure BDA0002392122630000242
As can be seen from table 1, fig. 2, fig. 3 and fig. 4:
1) the yield of comparative example 2 was significantly lower than the yields of examples 1 to 8 and comparative example 1, and the yields of examples 4, 6, 7 and 8 were significantly higher than those of examples 1, 2, 3, 5 and comparative example 1. The comparative example 2 reduces the bran, and because the bran is added into the solid culture medium, a hard layer is not formed on the surface of the solid culture medium, and the bran has good water absorption, certain gaps are formed among matrixes in the culture medium after the bran is added, so that the liquid strain inflow and the mycelium propagation are facilitated, the fruiting body weed production is facilitated, and the yield of the cordyceps militaris is improved. The ginkgo biloba extract was added to the liquid fermentation medium of examples 4, 6, 7 and 8, and thus the ginkgo biloba extract had the purpose of increasing the yield of cordyceps militaris.
2) The selenium content of the cordyceps militaris obtained in the examples 5 to 8 is obviously higher than that of the cordyceps militaris obtained in the examples 1 to 4 and the comparative examples 1 and 2. The selenium content of examples 7 and 8 was again higher than that of examples 5 and 6, and the selenium content of comparative example 1 was the lowest. In examples 5 and 6, the solid medium was enriched with concretio silicea Bambusae; in examples 7 and 8, the solid medium was supplemented with concretio silicea Bambusae and fructus Ligustri Lucidi; in comparative example 1, selenium yeast or sodium selenite was not added to the solid medium. Therefore, the tabasheer has the function of promoting the cordyceps militaris to absorb the enriched selenium element, and the glossy privet fruit has the function of further promoting the cordyceps militaris to absorb the enriched selenium element.
3) The adenosine content of examples 6 to 8 was significantly higher than that of examples 1 to 5, comparative examples 1 and 2. In examples 6 to 8, ginkgo biloba leaf extract was added to the liquid fermentation medium, and tabasheer was added to the solid medium. Therefore, the ginkgo leaf extract and the tabasheer have a synergistic effect on increasing the adenosine content.
4) In examples 1 to 8 and comparative example 1, the shape and color of the fruiting body were robust and golden yellow; in comparative example 2, the shape and color of the neutron entity were easily aged, thin, and pale yellow. In comparative example 2, bran was reduced in the solid medium. Therefore, the bran added into the solid culture medium has the effects of enabling the fruit bodies to grow robustly and have better color.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims (3)

1. A method for culturing high-yield selenium-rich cordyceps militaris is characterized by comprising the following steps:
s1, plate culture: inoculating the cordyceps militaris strain to a PDA culture medium, and culturing for 12-18 days at 18-25 ℃;
s2, liquid fermentation culture: inoculating the strains with good growth vigor in the step S1 into a liquid fermentation culture medium by adopting a puncher with the diameter of 1cm, and performing constant-temperature shaking culture for 7-15 days at the temperature of 20-28 ℃ and at the speed of 120-180 r/min to obtain liquid strains;
s3, hypha culture: inoculating the liquid strain to a solid culture medium according to the weight ratio of 8-14%, and culturing for 4-12 days at the temperature of 15-25 ℃ under the conditions of light protection, no oxygen and air relative humidity of 50-75% to obtain hyphae;
s4, color conversion culture: culturing the hyphae for 7-12 days under the conditions that the temperature is 16-25 ℃, the illumination intensity is 150-300 Lx, the illumination time is 10-16 h/d, and the relative humidity of air is 70-90%;
s5, stroma culture: culturing the color-transfer cultured hyphae for 8-18 days under the conditions that the temperature is 18-25 ℃, the illumination intensity is 200-400 Lx, the illumination time is 6-12 h/d, ventilation is carried out for 20-40 min every 4-6 h, and the relative air humidity is 75-95% to obtain fruiting bodies with the length of 4-6 cm;
s6, fruiting body culture: culturing the sporocarps for 30-40 days under the conditions that the temperature is 19-28 ℃, the illumination intensity is 200-400 Lx, the illumination time is 6-12 h/d, ventilation is kept, and the relative humidity of air is 75-90%;
the solid culture medium is mainly prepared from the following raw materials in parts by weight: 30-80 parts of rice, 5-15 parts of sorghum, 3-14 parts of bran, 0.1-0.6 part of monopotassium phosphate, 0.03-0.25 part of magnesium sulfate, 1-5 parts of cane sugar, 0.1-0.8 part of peptone, 0.2-2.0 parts of yeast powder, 0-0.008 part of vitamin B10.001, 0.01-0.15 part of tabasheer and 80-170 parts of water, and meanwhile, the solid culture medium further comprises 0.1-2.5 parts of selenium yeast or 0.1-2.5 parts of sodium selenite;
the liquid fermentation medium is mainly prepared from the following raw materials in percentage by weight: 2-8% of glucose, 0.1-0.6% of monopotassium phosphate, 0.03-0.3% of magnesium sulfate, 0.6-1.9% of peptone, 2-7% of yeast extract, 0.05-0.009% of vitamin B10.001, 0.05-0.2% of ginkgo leaf extract and the balance of water.
2. A liquid fermentation culture medium for high-yield selenium-rich cordyceps militaris is characterized by being mainly prepared from the following raw materials in percentage by weight: 2-8% of glucose, 0.1-0.6% of monopotassium phosphate, 0.03-0.3% of magnesium sulfate, 0.6-1.9% of peptone, 2-7% of yeast extract, 0.05-0.009% of vitamin B10.001, 0.05-0.2% of ginkgo leaf extract and the balance of water.
3. A solid culture medium for high-yield selenium-rich cordyceps militaris is characterized by being mainly prepared from the following raw materials in parts by weight: 30-80 parts of rice, 5-15 parts of sorghum, 3-14 parts of bran, 0.1-0.6 part of monopotassium phosphate, 0.03-0.25 part of magnesium sulfate, 1-5 parts of cane sugar, 0.1-0.8 part of peptone, 0.2-2.0 parts of yeast powder, 0. 10.001-0.008 part of vitamin B, 0.01-0.15 part of tabasheer and 80-170 parts of water, and meanwhile, the solid culture medium further comprises 0.1-2.5 parts of selenium yeast or 0.1-2.5 parts of sodium selenite.
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