JP5543704B2 - Powder medium - Google Patents

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JP5543704B2
JP5543704B2 JP2008266094A JP2008266094A JP5543704B2 JP 5543704 B2 JP5543704 B2 JP 5543704B2 JP 2008266094 A JP2008266094 A JP 2008266094A JP 2008266094 A JP2008266094 A JP 2008266094A JP 5543704 B2 JP5543704 B2 JP 5543704B2
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powder
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powder medium
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JP2009112305A (en
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啓 池内
久生 加戸
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Sapporo Breweries Ltd
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Description

本発明は、糖類を有効成分として含有する粉末培地に関する。 The present invention relates to a powder medium containing saccharide as an active ingredient.

微生物の生育や無菌充填システムの細菌汚染制御状況の確認等に広く使用される培地は、糖類、窒素源及び酵母エキス等の培地有効成分を混合して作られる。このような培地有効成分は、吸湿性が高いため、秤量器具に付着しやすいなど操作性の悪さが問題となっていた。また、吸湿により一旦固結した培地を粉砕して使用した場合、操作性が悪化するだけでなく、微生物生育性が低下し、実用性が低下するという問題点があった。 A medium widely used for confirmation of the growth of microorganisms and the bacterial contamination control status of an aseptic filling system is made by mixing medium active ingredients such as sugars, nitrogen source and yeast extract. Since such a medium active ingredient has high hygroscopicity, poor operability such as easy adhesion to a weighing instrument has been a problem. Further, when a medium once consolidated by moisture absorption is pulverized and used, not only the operability is deteriorated, but also the microbial viability is lowered and the practicality is lowered.

このような問題点に対して、粉末培地の吸湿性を低減させる手段として、例えば、混合流動させた粉末状の培地成分に液体成分を噴霧して細粒化し、更に結着剤を噴霧して乾燥させる技術が知られている(特許文献1)。
特開平8−252087号公報
As a means for reducing the hygroscopicity of the powder medium, for example, the liquid medium component is sprayed and finely divided into powdered medium components, and further the binder is sprayed. A technique for drying is known (Patent Document 1).
Japanese Patent Laid-Open No. 8-252087

しかしながら、このような従来の方法は、乾燥工程において培地成分を高温で加熱する必要があるため、手間がかかる上に、有効成分の熱劣化が問題となっていた。   However, in such a conventional method, since it is necessary to heat the medium components at a high temperature in the drying step, it takes time and heat degradation of the active ingredients has been a problem.

また、結着剤を使用した場合は、培地組成の変化により微生物生育に対して十分な栄養素とならないだけでなく、結着剤によって微生物の生育が阻害されるという問題もあった。   In addition, when the binder is used, there is a problem that not only the nutrient composition does not become a sufficient nutrient for the growth of the microorganism due to the change in the composition of the medium, but also the growth of the microorganism is inhibited by the binder.

本発明は、上記の現状に鑑みてなされたものであり、結着剤を使用することなく、高温加熱を必要としない簡便な方法で得られる粉末培地であって、吸湿性を低減させることにより、操作性に優れ、また、吸湿後の固結による微生物生育性の悪化を防止した粉末培地を提供することを目的としている。 The present invention has been made in view of the above situation, and is a powder medium obtained by a simple method that does not require high-temperature heating without using a binder, and reduces hygroscopicity. An object of the present invention is to provide a powder medium that is excellent in operability and prevents deterioration of microbial growth due to consolidation after moisture absorption.

本発明は、糖類を有効成分として含有し、粉末状、顆粒状、または粉末と顆粒とが混合した状態の培地であって、糖類は、無水結晶ブドウ糖である、粉末培地を提供する。 The present invention provides a powder medium containing a saccharide as an active ingredient and in a powdery, granular, or mixed state of powder and granule , wherein the saccharide is anhydrous crystalline glucose .

本発明者らは、培地成分の原材料として使用される糖類が無水結晶ブドウ糖である粉末培地は、吸湿性が低減されることを見出した。このような培地は、操作性に優れ、また、吸湿後の固結による微生物生育性の悪化を防止することができる。 The present inventors have found that the hygroscopicity is reduced in the powder medium in which the saccharide used as the raw material of the medium component is anhydrous crystalline glucose . Such a medium is excellent in operability and can prevent deterioration of microbial growth due to consolidation after moisture absorption.

本発明の粉末培地は、使用される無水糖類が無水結晶ブドウ糖である。 Powdered media of the present invention, anhydrous saccharide used is Ru anhydrous crystalline dextrose der.

ブドウ糖は、その他の糖類と比較して微生物が資化しやすく、より微生物生育性に優れた粉末培地を提供することができる。 Glucose is easier to assimilate microorganisms than other saccharides, and can provide a powder medium with more excellent microorganism growth.

本発明の粉末培地は、水分含量が0.1質量%以上5.0質量%以下に調整されていることが好ましい。 The powder medium of the present invention preferably has a water content adjusted to 0.1% by mass or more and 5.0% by mass or less.

水分含量が上記範囲に調整された粉末培地は、吸湿性が顕著に低減されるため、操作性を更に向上させ、吸湿後の固結による微生物生育性の悪化を防止することができる。 The powder medium whose water content is adjusted to the above range has a significantly reduced hygroscopicity, and therefore can further improve operability and prevent deterioration of microbial growth due to consolidation after moisture absorption.

また、本発明の粉末培地は、酵母エキス及びペプトンからなる群より選ばれる少なくとも1種を含有してもよい。 The powder medium of the present invention may contain at least one selected from the group consisting of yeast extract and peptone.

酵母エキス及びペプトンは、吸湿性が非常に高いため、これらを有効成分として含有する粉末培地は、操作性及び微生物生育性が顕著に悪化する。 Since yeast extract and peptone have very high hygroscopicity, the operability and microbial growth are significantly deteriorated in a powder medium containing these as active ingredients.

本発明の粉末培地は、上記成分を含有している場合においても、吸湿性が効果的に低減されるため、操作性が向上し、吸湿による微生物生育性の悪化を防止することができる。 Even when the powder medium of the present invention contains the above-mentioned components, the hygroscopicity is effectively reduced, so that the operability is improved and the deterioration of microbial viability due to moisture absorption can be prevented.

更に、本発明の粉末培地は、粒径90μm以上1500μm以下である顆粒の含有割合が70重量%以上であることが好ましい。 Furthermore, in the powder medium of the present invention, the content ratio of granules having a particle size of 90 μm or more and 1500 μm or less is preferably 70% by weight or more.

粒径90μm以上1500μm以下である顆粒の含有割合が70重量%以上である粉末培地は、単位重量あたりの表面積が小さいため、吸湿性が更に低減される。また、成分の飛散が防止されると共に、水への溶解性が向上し、操作性が更に向上する。 The powder culture medium in which the content ratio of granules having a particle size of 90 μm or more and 1500 μm or less is 70% by weight or more has a small surface area per unit weight, and thus the hygroscopicity is further reduced. In addition, scattering of the components is prevented, solubility in water is improved, and operability is further improved.

本発明によれば、結着剤を使用することなく、高温加熱を必要としない簡便な方法で得られる粉末培地であって、吸湿性を低減させることにより、操作性に優れ、また、吸湿後の固結による微生物生育性の悪化を防止した粉末培地を提供することができる。 According to the present invention, it is a powder medium obtained by a simple method that does not require high-temperature heating without using a binder, and is excellent in operability by reducing hygroscopicity. It is possible to provide a powder medium in which deterioration of microbial growth due to solidification is prevented.

以下、本発明に係る好適な実施形態について説明する。   Preferred embodiments according to the present invention will be described below.

(原料)
本発明において、糖類とは、当該分野で培地有効成分として通常使用される糖類成分をいい、例えば、ブドウ糖、麦芽糖、乳糖、ショ糖及びトレハロース等が挙げられる。
(material)
In the present invention, the saccharide refers to a saccharide component usually used as a medium active ingredient in this field, and examples thereof include glucose, maltose, lactose, sucrose, and trehalose.

ここで、無水糖類とは、結晶構造内に水を含まない糖類のことをいい、例えば、JAS規格に定められた無水結晶ブドウ糖であり、水分が0.2質量%以下のものをいう。   Here, the anhydrous saccharide refers to a saccharide that does not contain water in the crystal structure. For example, it is an anhydrous crystalline glucose specified in the JAS standard and has a moisture content of 0.2% by mass or less.

一般に、無水物は吸湿性が高く、水和を受けやすいことで知られている。このことから、無水糖類を培地の有効成分として使用した場合、該粉末培地の吸湿性は向上されることが予想される。 In general, anhydrides are known to be highly hygroscopic and susceptible to hydration. Therefore, when using anhydrous saccharides as an active ingredient of the medium, hygroscopic of the powdered medium is expected to be improved.

しかしながら、本発明者らは、原料として無水糖類を用いることにより、吸湿性が低減された粉末培地が得られることを発見し、本発明を完成させるに至った。 However, the present inventors have found that a powder medium with reduced hygroscopicity can be obtained by using anhydrosaccharide as a raw material, and the present invention has been completed.

(他の原料)
本発明の粉末培地は、有効成分として酵母エキス及びペプトンからなる群より選ばれる少なくとも1種を含有してもよい。ここで、本発明に使用される酵母エキス及びペプトンは、ペクトン・ディッキンソン社や日本製薬社等の試薬メーカーから容易に入手することができる。
(Other ingredients)
The powder medium of the present invention may contain at least one selected from the group consisting of yeast extract and peptone as an active ingredient. Here, the yeast extract and peptone used in the present invention can be easily obtained from reagent manufacturers such as Pecton Dickinson and Nippon Pharmaceutical.

また、本発明の粉末培地は、有効成分として当該分野で通常使用される培地成分を含有してもよい。これら通常使用される培地成分としては、例えば、カンテン、食塩、塩化カルシウム、硫酸アンモニウム、ビタミン類及び肝臓エキス等が挙げられ、これらの培地成分は1種又は複数種であってもよい。 Moreover, the powder culture medium of this invention may contain the culture medium component normally used in the said field | area as an active ingredient. Examples of these commonly used medium components include agar, salt, calcium chloride, ammonium sulfate, vitamins, liver extract and the like, and these medium components may be one or more.

(製造方法)
本発明の粉末培地は、固体(粉末)の培地成分を混合することにより得られる。培地成分の混合は、各成分を均等に混合すればよく、例えば、容器回転型混合機、ナウターミキサー及び流動層造粒機等を使用することができる。なお、粒径が大きい培地成分を使用する場合には、混合前に粉砕工程を経てもよい。
(Production method)
The powder medium of the present invention is obtained by mixing solid (powder) medium components. The medium components may be mixed by mixing the components uniformly. For example, a container rotating mixer, a nauter mixer, a fluidized bed granulator, or the like can be used. In addition, when using a culture medium component with a large particle size, you may pass through a grinding | pulverization process before mixing.

また、本発明の粉末培地は、当該分野で通常使用される造粒工程、例えば、流動層造粒機(パウレック社製、WSG−300)を使って、粉末状の培地成分に水を噴霧し、送風乾燥させる造粒工程、を経ることによって顆粒状にしてもよい。この乾燥工程における温度は、40℃以上70℃以下が好ましく、45℃以上60℃以下がより好ましい。 Moreover, the powder culture medium of this invention sprays water on a powdery culture-medium component using the granulation process normally used in the said field | area, for example, a fluidized-bed granulator (the product made by POWREC, WSG-300). Alternatively, it may be granulated by passing through a granulation step of blowing and drying. The temperature in this drying step is preferably 40 ° C. or higher and 70 ° C. or lower, and more preferably 45 ° C. or higher and 60 ° C. or lower.

また、乾燥工程における培地の水分含量は、0.1質量%以上5.0質量%以下に調整することが好ましく、1.0質量%以上5.0%がより好ましく、1.5質量%以上3.5質量%以下が更に好ましい。   Further, the water content of the medium in the drying step is preferably adjusted to 0.1% by mass or more and 5.0% by mass or less, more preferably 1.0% by mass or more and 5.0% by mass, and more preferably 1.5% by mass or more. 3.5 mass% or less is still more preferable.

ここで、結晶水とは、ホストとなる糖類と共有結合を作らずに結晶内に存在する水分子をいう。すなわち、含水糖類は、結晶水を持つ糖類をいう。かかる含水糖類は、水素結合が多く存在するため、構造が非常に複雑であり、含水糖類から結晶水を取り除くために強い熱エネルギーが必要となる。   Here, the crystal water refers to water molecules present in the crystal without forming a covalent bond with the host saccharide. That is, the hydrous saccharide refers to a saccharide having crystal water. Such hydrous saccharides have many hydrogen bonds, so the structure is very complex, and strong heat energy is required to remove crystal water from the hydrous sugars.

従って、無水糖類の代替として含水糖類を使用した場合において、培地の水分含量を上記範囲内に調節するためには、100℃以上で加熱するか、又は、真空加熱する必要があり、吸湿性が低減された培地の提供は困難となる。   Therefore, when hydrous saccharides are used as an alternative to anhydrous saccharides, in order to adjust the moisture content of the medium within the above range, it is necessary to heat at 100 ° C. or higher or vacuum heat, Providing a reduced medium becomes difficult.

なお、水分とは、結晶水及び結晶の表面に結合した付着水のことをいう。培地の水分含量は、当該分野で使用される水分含量測定法、例えば、常圧加熱乾燥法(105℃、4時間)、カールフィッシャー法、蒸留法及び電気水分計法等で測定することができる。   Moisture means crystal water and adhering water bonded to the surface of the crystal. The water content of the medium can be measured by a water content measurement method used in the art, for example, atmospheric pressure heating drying method (105 ° C., 4 hours), Karl Fischer method, distillation method, electric moisture meter method and the like. .

本発明の粉末培地は、最終工程として、温風で乾燥後、冷却されることにより完成される。この乾燥及び冷却は、粉末培地が計量及び包装に耐え得る程度でよく、例えば、50℃以上の温風で乾燥後、45℃以下の冷風による冷却を行う。 The powder culture medium of the present invention is completed by being dried with warm air and then cooled as a final step. The drying and cooling may be such that the powder medium can withstand weighing and packaging. For example, after drying with hot air of 50 ° C. or higher, cooling with cold air of 45 ° C. or lower is performed.

(粒径)
本発明の粉末培地は、粒径90μm以上1500μm以下のである顆粒の含有割合が70重量%以上であることが好ましく、100μm以上1200μm以下であることがより好ましい。粒径が90μm以上である顆粒の粉末培地は、単位重量あたりの表面積が小さいため、吸湿性が低減される。さらに、成分の飛散を防止すると共に、水への溶解性が向上し、操作性の向上を図ることができる。また、粒径が1500μm以下である顆粒の粉末培地は、1500μmより大きい塊を除去又は粉砕することが不要となり、操作性の向上を図ることができる。
(Particle size)
In the powder medium of the present invention, the content ratio of granules having a particle size of 90 μm or more and 1500 μm or less is preferably 70% by weight or more, and more preferably 100 μm or more and 1200 μm or less. A granulated powder medium having a particle size of 90 μm or more has a small surface area per unit weight, and therefore has reduced hygroscopicity. Furthermore, while preventing scattering of components, solubility in water is improved, and operability can be improved. In addition, the granular powder medium having a particle size of 1500 μm or less does not require removal or pulverization of a lump larger than 1500 μm, and the operability can be improved.

上記範囲の粒径で選別するには、篩分工程を経ればよく、例えば、シフターを用いて目開き1500μmで篩い、シフターを通過した画分を回収すればよい。また、粒径90μm以上である顆粒を得る場合は、目開き1500μm通過画分を目開き90μmで篩い、篩上画分を回収すればよい。   In order to select a particle size within the above range, a sieving step may be performed. For example, the sieving may be performed using a shifter with an opening of 1500 μm and the fraction passing through the shifter may be collected. Moreover, when obtaining a granule having a particle size of 90 μm or more, it is only necessary to sieve a fraction having a mesh opening of 1500 μm with a mesh opening of 90 μm and recovering the fraction on the sieve.

(用途)
本発明の粉末培地は、実験室で使用される小規模スケール、例えば、微生物の生育試験、一般生菌及び耐熱生菌の検出、又は産業上使用される大規模スケール、例えば、無菌性充填の細菌汚染制御状況の確認や微生物の調査への利用に適している。
(Use)
The powder medium of the present invention can be used in small scales used in laboratories such as microbial growth tests, detection of general and heat-resistant bacteria, or large scales used in industry such as aseptic filling. It is suitable for use in confirming bacterial contamination control status and in examining microorganisms.

以下、実施例を挙げて本発明を具体的に説明するが、本発明はこれらの実施例に限定されるものではない。   EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these Examples.

〔実施例1〕
(サンプル調整)
表1は、培地成分の混合割合を、重量(%)で示したものである。
(表1)
原料 配合比(%)
無水結晶ブドウ糖 43
酵母エキス 11
ペプトン 16
食塩 27
硫酸アンモニウム 4
[Example 1]
(Sample adjustment)
Table 1 shows the mixing ratio of the medium components by weight (%).
(Table 1)
Raw material mix ratio (%)
Anhydrous crystalline glucose 43
Yeast extract 11
Peptone 16
Salt 27
Ammonium sulfate 4

表1に示す配合割合で原料を混合し、粉末の培地(実施例1)を得た。 The raw material at the mixing ratio shown in Table 1 were mixed to obtain powder of culture land (Example 1).

(X線回折測定)
粉末の培地(実施例1)0.1gをX線回折装置(スペクトリス社製、X’Pert Pro MPD)に充填し、以下の条件で測定を行った。
ターゲット:Cu
X線管電流:40mA
X線管電圧:45kV
走査範囲:2θ=4〜40°
ステップ:2θ=0.01671°
平均時間/ステップ:10.16
固定発散スリット:1/2°
(X-ray diffraction measurement)
Culture locations powder (Example 1) 0.1 g of X-ray diffraction device (Spectris Co., X'Pert Pro MPD) was filled in, was measured under the following conditions.
Target: Cu
X-ray tube current: 40 mA
X-ray tube voltage: 45 kV
Scanning range: 2θ = 4-40 °
Step: 2θ = 0.01671 °
Average time / step: 10.16
Fixed divergence slit: 1/2 °

結果を図1に示す。図1は、無水結晶ブドウ糖を用いた粉末の培地のX線回析結果を示す図である。 The results are shown in FIG. Figure 1 is a diagram showing an X-ray diffraction results of the culture locations powder using anhydrous crystalline glucose.

〔実施例2〕
(サンプル調整)
表1に示す割合で原料を計量し、酵母エキスとペプトン以外の原料をピンミル粉砕機にて粉砕した。粉砕した原料、酵母エキス及びペプトンを試験用造粒機(フロイント産業社製、FL−40)に投入し3分間混合後、バインダーとしての水を噴霧し、送風温度55℃にて乾燥させ、造粒した。造粒後、55℃の温風で乾燥後、45℃の冷風で冷却を行った。冷却後、シフター((株)西村機械製作所製)を用いて目開き1190μm(16メッシュ)で篩分し、回収された通過画分の顆粒の培地(実施例2)を得た。
[Example 2]
(Sample adjustment)
The raw materials were weighed at the ratio shown in Table 1, and the raw materials other than the yeast extract and peptone were pulverized with a pin mill pulverizer. The ground raw material, yeast extract and peptone are put into a test granulator (Freund Sangyo Co., Ltd., FL-40), mixed for 3 minutes, sprayed with water as a binder, dried at a blowing temperature of 55 ° C. Grained. After granulation, it was dried with hot air at 55 ° C. and then cooled with cold air at 45 ° C. After cooling, the shifter (Co. Nishimura Kikai Seisakusho) and sieved through a mesh opening 1190Myuemu (16 mesh) were used to obtain recovered through fraction of the granules of culture land (Example 2).

〔実施例3〕
(サンプル調整)
表1に示す割合で原料を計量し、酵母エキスとペプトン以外の原料をピンミル粉砕機にて粉砕した。粉砕した原料、酵母エキス及びペプトンを流動層造粒機(パウレック社製、WSG−300)に投入し3分間混合の後、バインダーとして水を噴霧し、送風温度50℃にて乾燥させ、造粒した。造粒後、55℃の温風で再度乾燥の後、45℃の冷風で冷却を行った。冷却後、(株)西村機械製作所製シフターを用いて目開き1190μm(16メッシュ)で篩分し、回収された通過画分の顆粒の培地(実施例3)を得た。
Example 3
(Sample adjustment)
The raw materials were weighed at the ratio shown in Table 1, and the raw materials other than the yeast extract and peptone were pulverized with a pin mill pulverizer. The pulverized raw material, yeast extract and peptone are put into a fluidized bed granulator (WSG-300, manufactured by POWREC), mixed for 3 minutes, sprayed with water as a binder, dried at a blowing temperature of 50 ° C., and granulated. did. After granulation, it was dried again with hot air at 55 ° C. and then cooled with cold air at 45 ° C. After cooling to obtain Ltd. Nishimura was sieved through a mesh opening 1190Myuemu (16 mesh) using a mechanical Mfg shifter, recovered through fraction of the granules of culture land (Example 3).

〔比較例1〕
(サンプル調整)
表2は、培地成分の混合割合を、重量(%)で示したものである。
(表2)
原料 配合比 (%)
含水結晶ブドウ糖 43
酵母エキス 11
ペプトン 16
食塩 27
硫酸アンモニウム 4
[Comparative Example 1]
(Sample adjustment)
Table 2 shows the mixing ratio of the medium components by weight (%).
(Table 2)
Raw material compounding ratio (%)
Hydrous crystal glucose 43
Yeast extract 11
Peptone 16
Salt 27
Ammonium sulfate 4

表2に示す配合割合で原料を混合し、粉末の培地(比較例1)を得た。 Table 2 raw material were mixed at the mixing ratio shown in, to give a powder of culture areas (Comparative Example 1).

(X線回折測定)
粉末の培地(比較例1)のX線回折測定を、実施例1のX線回折測定と同様に行った。
(X-ray diffraction measurement)
Culture locations powder X-ray diffraction measurement of Comparative Example 1 was performed in the same manner as the X-ray diffraction measurement in Example 1.

結果を図2に示す。図2は、含水結晶ブドウ糖を用いた粉末の培地のX線回折結果を示す図である。 The results are shown in FIG. Figure 2 is a diagram showing the X-ray diffraction pattern of culture locations powder with hydrous crystalline glucose.

〔比較例2〕
(サンプル調整)
原料中無水結晶ブドウ糖に変えて含水結晶ブドウ糖を用たこと、また、冷却後の篩分を電磁ふるい振とう機(三田村理研工業(株)製)で行ったこと以外は実施例2と同様にして、顆粒の培地(比較例2)を得た。
[Comparative Example 2]
(Sample adjustment)
It had use a hydrous crystalline glucose instead of anhydrous crystalline glucose in the feed, also except that the sieving after cooling was carried out in an electromagnetic sieve shaker (manufactured by Mitamura Riken Kogyo Co., Ltd.) is as in Example 2 There was obtained culture locations granules (Comparative example 2).

〔比較例3〕
(サンプル調整)
市販の粉末SCD培地(日本製薬社製)を比較例3とした。
[Comparative Example 3]
(Sample adjustment)
A commercially available powder SCD medium (Nippon Pharmaceutical Co., Ltd.) was used as Comparative Example 3.

〔試験1:粉末培地の吸湿性試験〕
実施例2、3及び比較例2の粉末培地について、湿度75%における、所定温度条件下での保管試験を行った。結果を図3及び4に示す。図3は、25℃保管の粉末培地の水分含量測定値、及び外観観察による固結状態を示す図であり、図4は、40℃保管の粉末培地の水分含量測定値、及び外観観察による固結状態を示す図である。
[Test 1: Hygroscopicity test of powder medium]
The powder culture media of Examples 2 and 3 and Comparative Example 2 were subjected to a storage test under a predetermined temperature condition at a humidity of 75%. The results are shown in FIGS. FIG. 3 is a diagram showing the measured moisture content of the powder medium stored at 25 ° C. and the consolidated state by appearance observation, and FIG. 4 is the measured moisture content of the powder medium stored at 40 ° C. and fixed by the appearance observation. It is a figure which shows a conclusion state.

図3に示すように、比較例2の粉末培地が1年以内に固結したのに対し、実施例2及び3の粉末培地では1年経過後も顆粒の状態を維持していた。また、図4に示すように、比較例2の粉末培地が2週間以内に固結したのに対し、実施例2及び3では、3ヶ月経過後も顆粒の状態を維持していた。 As shown in FIG. 3, the powder medium of Comparative Example 2 solidified within one year, whereas the powder mediums of Examples 2 and 3 maintained the granular state even after one year. Moreover, as shown in FIG. 4, the powder culture medium of Comparative Example 2 consolidated within 2 weeks, whereas in Examples 2 and 3, the state of granules was maintained even after 3 months.

上記結果から明らかなように、本発明の粉末培地は、吸湿性が低く、固結しにくい培地であることが示された。 As is clear from the above results, it was shown that the powder medium of the present invention is a medium that has low hygroscopicity and is difficult to consolidate.

〔試験2:粉末培地の溶解性〕
実施例3及び比較例3の粉末培地4gを、200rpmで攪拌中の水(25℃、200ml)にそれぞれ投入し、全て溶解するまでの時間を計測した。
[Test 2: Solubility of powder medium]
4 g of the powder mediums of Example 3 and Comparative Example 3 were respectively added to stirring water (25 ° C., 200 ml) at 200 rpm, and the time until all were dissolved was measured.

結果を図5に示す。図5は、実施例3及び比較例3の粉末培地(図中では固体培地と示す)の溶解性を示す図である。 The results are shown in FIG. FIG. 5 is a graph showing the solubility of the powder media (shown as solid media in the figure) of Example 3 and Comparative Example 3.

図5に示すように、比較例3の粉末培地は全て溶解するまので時間が240秒以上であったのに対し、実施例3の粉末培地は60秒で全て溶解した。 As shown in FIG. 5, it took 240 seconds or more until the powder medium of Comparative Example 3 was dissolved, whereas the powder medium of Example 3 was completely dissolved in 60 seconds.

上記結果から明らかなように、本発明の粉末培地は、非常に高い溶解性を有することが示された。 As is clear from the above results, the powder medium of the present invention was shown to have very high solubility.

〔試験3:微生物生育性〕
実施例1、3及び比較例3の粉末培地各0.2gを水10mLに溶解させ、2%溶液(pH7)を調整し、121℃、20分の条件下で滅菌した。滅菌した各サンプルに10^4cfu/mLとなるようにBacillus Subtillisを植菌後、35℃で振とう培養を行い、所定時間経過後の各サンプルの濁度を分光光度計(波長660nm)で測定した。
[Test 3: Microbial growth]
0.2 g of each of the powder media of Examples 1 and 3 and Comparative Example 3 was dissolved in 10 mL of water to prepare a 2% solution (pH 7) and sterilized at 121 ° C. for 20 minutes. After inoculating Bacillus Subtilis at 35 ° C after inoculating each sterilized sample to 10 ^ 4 cfu / mL, culturing with shaking at 35 ° C and measuring the turbidity of each sample after a predetermined time with a spectrophotometer (wavelength 660 nm) did.

結果を図6に示す。図6は、実施例1、3及び比較例3の粉末培地の微生物生育性を示す図である。 The results are shown in FIG. FIG. 6 is a diagram showing the microbial viability of the powder media of Examples 1 and 3 and Comparative Example 3.

図6に示すように、実施例1及び3の粉末培地を使用した場合には、比較例3の粉末培地を使用した場合と比較して、微生物の生育状態が良好であった。 As shown in FIG. 6, when the powder media of Examples 1 and 3 were used, the growth state of the microorganisms was better than when the powder media of Comparative Example 3 was used.

上記結果から明らかなように、本発明の粉末培地は、従来の粉末培地と比べて高い培地能力を有することが示された。また、実施例1及び3の結果から明らかなように、培地能力は、造粒の有無に依存しないことが示された。 As is clear from the above results, it was shown that the powder medium of the present invention has a higher medium capacity than the conventional powder medium. Further, as is clear from the results of Examples 1 and 3, it was shown that the medium capacity did not depend on the presence or absence of granulation.

無水結晶ブドウ糖を用いた粉末の培地のX線回折結果を示す図である。It is a diagram showing the X-ray diffraction pattern of culture locations powder using anhydrous crystalline glucose. 含水結晶ブドウ糖を用いた粉末の培地のX線回折結果を示す図である。It is a diagram showing the X-ray diffraction pattern of culture locations powder with hydrous crystalline glucose. 25℃保管の粉末培地の水分含量測定値、及び外観観察による固結状態を示す図である。It is a figure which shows the moisture content measured value of the powder culture medium stored at 25 degreeC, and the solidification state by external appearance observation. 40℃保管の粉末培地の水分含量測定値、及び外観観察による固結状態を示す図である。It is a figure which shows the moisture content measured value of the powder culture medium stored at 40 degreeC, and the solidification state by external appearance observation. 実施例3及び比較例3の粉末培地(図中では固体培地と示す)の溶解性を示す図である。 It is a figure which shows the solubility of the powder culture medium (it shows with a solid culture medium in the figure) of Example 3 and Comparative Example 3. 実施例1、3及び比較例3の粉末培地の微生物生育性を示す図である。It is a figure which shows the microbial growth property of the powder culture medium of Example 1, 3 and the comparative example 3. FIG.

Claims (4)

糖類を有効成分として含有し、粉末状、顆粒状、または粉末と顆粒とが混合した状態の培地であって、
前記糖類は、無水結晶ブドウ糖である、粉末培地。
A medium containing saccharides as an active ingredient and in a powdery, granular, or mixed state of powder and granules ,
The powder medium, wherein the saccharide is anhydrous crystalline glucose .
水分含量は、0.1質量%以上5.0質量%以下に調整されている、請求項1に記載の粉末培地。 The powder medium according to claim 1, wherein the water content is adjusted to 0.1 mass% or more and 5.0 mass% or less. 酵母エキス及びペプトンからなる群より選ばれる少なくとも1種を含有する、請求項1又は2に記載の粉末培地。 The powder medium according to claim 1 or 2 , comprising at least one selected from the group consisting of yeast extract and peptone. 粒径90μm以上1500μm以下である顆粒の含有割合は、70重量%以上である、請求項1〜のいずれか一項に記載の粉末培地。 The powder medium according to any one of claims 1 to 3 , wherein a content ratio of granules having a particle size of 90 µm or more and 1500 µm or less is 70 wt% or more.
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