CN112640923B - Application of turmeric essential oil as ultraviolet sterilization synergist - Google Patents
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Abstract
The invention belongs to the technical field of ultraviolet sterilization, and discloses application of turmeric essential oil as an ultraviolet sterilization synergist. The research is based on that the A wave band Ultraviolet (UVA) and turmeric essential oil have weak sterilization effect (the sterilization amount is 0.5log-1.5log when the turmeric essential oil acts alone), and the turmeric essential oil have obvious synergistic sterilization effect after combined action. Compared with the traditional ultraviolet sterilization technology, the ultraviolet sterilization device can kill bacteria more efficiently and reduce the influence of the quality of the ultraviolet lamp on the sterilization effect.
Description
Technical Field
The invention relates to the technical field of ultraviolet sterilization, and particularly relates to application of turmeric essential oil as an ultraviolet sterilization synergist.
Background
The uv sterilization technique is a convenient method with no chemical residue and little environmental impact, and is commonly used to disinfect gas, liquid and solid surfaces. Ultraviolet radiation is a generic term for radiation in the electromagnetic spectrum having a wavelength of 400nm to 10nm and does not cause human vision. It is invisible light having a higher frequency than bluish violet light, and ultraviolet rays are classified into UVA, UVB, UVC, and UVD. The ultraviolet lamp sterilization is used in various places due to the advantages of low cost, convenient use, no drug resistance and the like. In recent years, bacterial drug resistance is getting worse due to the use of a large amount of antibiotics, and the effect of treating infection caused by germs is gradually weakened along with the appearance of multi-drug resistant bacteria, so that the research on non-antibiotic sterilization technology is more and more applied in clinic, and the research on ultraviolet sterilization effect is more and more intensive.
The principle of the ultraviolet sterilization technology is that ultraviolet radiation with proper wavelength is utilized to destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in organism cells to cause death of growing cells and/or regenerating cells, thereby achieving the sterilization effect. The ultraviolet sterilization technology is based on modern epidemic prevention science, medicine and photodynamic, and specially designed ultraviolet with high efficiency, high strength and long service life is adopted to irradiate the surface of an object to directly kill various pathogens such as bacteria, viruses, parasites, algae and the like on the surface of the object. Meanwhile, the bacteria can be killed under the condition of not generating antibiotic drug resistance, so that the drug resistance of the bacteria is not improved. However, low-energy ultraviolet light by itself is not sufficient to achieve a very good germicidal effect, the germicidal time is long and the bacteria cannot be completely killed.
Turmeric is a perennial herb of the genus curcuma, is widely distributed in Asian regions, can be used as both medicine and food, is widely used as a natural colorant in the food industry due to bright color, strong tinting strength and good thermal stability, and has the effects of resisting tumors, mutation and bacteria. The turmeric essential oil has the advantage that the turmeric essential oil has a certain antibacterial effect on bacteria. In order to enhance the ultraviolet sterilization effect, the research of the ultraviolet sterilization effect synergist is an essential step. However, the currently reported essential oil still has less ultraviolet sterilization synergistic effect, and a new ultraviolet sterilization synergistic agent needs to be supplemented urgently to increase the sterilization effect of ultraviolet rays in various occasions.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide the application of the turmeric essential oil as the ultraviolet sterilization synergist.
The second purpose of the invention is to provide a method for sterilizing by using turmeric essential oil and ultraviolet.
The purpose of the invention is realized by the following technical scheme:
application of Curcuma rhizome essential oil as ultraviolet sterilizing synergist is provided.
The research of the invention finds that the combination of the turmeric essential oil and ultraviolet can obviously enhance the ultraviolet sterilization capability, so that the turmeric essential oil can be used as a synergist for ultraviolet sterilization.
The invention also provides an ultraviolet sterilization synergist which comprises turmeric essential oil.
The invention also provides a method for sterilizing by combining ultraviolet with the turmeric essential oil, wherein the irradiation time of the ultraviolet is 30min, and the concentration of the turmeric essential oil is 1%.
Preferably, in the method for sterilizing, the ultraviolet intensity is 2.4-3.0mW/cm2。
Preferably, in the sterilization method, the ultraviolet irradiation is performed for 30min before preheating.
Preferably, the method of sterilizing comprises the steps of:
(1) mixing the bacterial liquid with 1% of turmeric essential oil, placing the mixture in a six-hole plate, and setting ultraviolet irradiation conditions: wavelength range of 300-460nm, power of 18W, distance from the six-hole plate to the ultraviolet lamp tube of 8cm, and ultraviolet intensity of 2.4-3.0mW/cm2；
(2) Preheating the ultraviolet box for 20-40min, and placing the six-hole plate in the ultraviolet box for irradiating for 25-35 min.
More preferably, the final concentration of the bacterial liquid in the step (1) of the sterilization method is 106CFU/mL。
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a synergist having a synergistic effect with ultraviolet, and the research is based on that the sterilization effect of Ultraviolet (UVA) in the A wave band and turmeric essential oil is weak (the sterilization amount is 0.5log-1.5log when the ultraviolet and turmeric essential oil act independently), and the synergistic sterilization effect is obvious after the ultraviolet and turmeric essential oil are combined to act. Compared with the traditional ultraviolet sterilization technology, the ultraviolet sterilization device can kill bacteria more efficiently and reduce the influence of the quality of the ultraviolet lamp on the sterilization effect.
Drawings
FIG. 1 is a graph showing the statistical results of the number of strains in example 4.
Detailed Description
The following further describes the embodiments of the present invention. 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.
The test methods used in the following experimental examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are, unless otherwise specified, commercially available reagents and materials.
The ultraviolet lamp used was brand PHILIPS TL-D; wattage: 18W; voltage: 220V; wavelength: (UVA)300-469 nm; tube diameter of the lamp tube: 25 mm; length: 60 cm. The turmeric essential oil is of the Satya brand (italy).
The judgment principle is as follows: for example, the bacterial quantity reduced by the experimental group is reduced by 2 log values on the basis of the bacterial quantity reduction of the ultraviolet treatment alone and the essential oil treatment alone, and the essential oil and the ultraviolet have the synergistic sterilization effect.
Example 1 germicidal Effect of different UV irradiation times on ATCC25922 Strain
1. Experimental materials:
(1) the ultraviolet lamp used for the test is PHILIPS TL-D brand; wattage: 18W; voltage: 220V; wavelength: (UVA)300-469 nm; tube diameter of the lamp tube: 25 mm; length: 60 cm.
(2) Test medium: the MH agar medium and the MacConkey agar medium (purchased from Guangdong Huancao Microscience Co., Ltd.) which were sterilized by autoclaving were cooled to 40 ℃, 20mL of the MH agar medium and the MacConkey agar medium were put into a sterile petri dish using a pipette, and naturally dried for 30min to obtain the MH agar medium and the MacConkey agar medium.
Coli standard strain ATCC25922 (laboratory collection).
2. Preparation work before the test:
(1) starting an ultraviolet lamp and continuously irradiating for 30 minutes for preheating;
(2) the E.coli standard strain ATCC25922 was cultured on MacconyKa medium to a suitable size.
3. Ultraviolet sterilization effect evaluation experiment:
(1) inoculating Escherichia coli ATCC25922, placing single colony in a centrifuge tube filled with 4mL MH broth, putting the centrifuge tube in a 37-degree shaking table, incubating for 4 hours at 180 revolutions, and taking out the centrifuge tube;
(2) placing the centrifuge tube into a centrifuge, centrifuging for 8min at 5000 rpm, and pouringAdding equal volume of physiological saline into the supernatant for resuspension, and performing gradient dilution to make the final bacterial load be 106CFU/mL；
(3) Adding 1mL of bacterial liquid into a six-hole plate;
(4) setting blank control group and ultraviolet irradiation treatment group, wherein the ultraviolet irradiation treatment group is divided into three groups, and irradiating for 15min, 30min and 60min respectively.
(5) After the ultraviolet irradiation is finished, 100 mu L of bacterial liquid is absorbed and added into a 2mL centrifuge tube filled with 900 mu L of 0.85% physiological saline for gradient dilution, 25 mu L of bacterial liquid is absorbed and dropped on an MH agar culture medium after dilution, the culture box with the temperature of 37 ℃ is incubated for 16-18h, counting is carried out, and the statistical analysis is carried out after the experimental result is repeated through three biology.
The results are shown in table 1, the bacteriostatic effect of ultraviolet on bacteria is increased with the increase of the irradiation time, wherein the difference between the number of bacteria in the group irradiated with ultraviolet for 15min and the number of bacteria in the blank control group is not large, which indicates that the short irradiation time of ultraviolet cannot produce a significant bacteriostatic effect on ATCC 25922. The number of bacteria in the group irradiated by ultraviolet for 30min begins to decrease, which indicates that the ultraviolet begins to have a certain bacteriostatic effect on the bacteria.
TABLE 1 germicidal Effect of UV irradiation time on ATCC25922 strains
Example 2 determination of MIC of various concentrations of turmeric essential oil against ATCC25922 Strain
1. Experimental materials:
(1) and (3) testing: autoclaved MH broth was cooled for use.
(2) Resin azure: macklin (Maclin) brand, MW 251.17, purity 90%;
coli standard strain ATCC25922 (laboratory collection).
2. Preparation work before the test:
(1) taking out the turmeric essential oil from the refrigerator, balancing to room temperature, and sucking part of turmeric essential oil for later use;
(2) the E.coli standard strain ATCC25922 was cultured on MacconyKa agar medium to a suitable size.
(3) 0.2512g of resin azure powder was weighed into a centrifuge tube, and 10mL of pure water was added to dissolve the resin azure powder, and the concentration of the resin azure solution was 10 mM/L.
3. Evaluation experiment of bactericidal effect of turmeric essential oil:
(1) inoculating Escherichia coli ATCC25922, placing single colony in a centrifuge tube filled with 4mL MH broth, putting the centrifuge tube in a 37-degree shaking table, incubating for 4 hours at 180 revolutions, and taking out the centrifuge tube;
(2) the incubated E.coli was diluted 100-fold using MH broth to about 106CFU/mL for standby;
(3) taking a sterile 96-well plate, adding 180 mu L of MH broth medium to the 1 st well, and adding 100 mu L of MH broth medium to the 2 nd-11 th well;
(4) adding 20 mu L of essential oil with the original concentration into the 1 st hole, sucking 100 mu L to the 2 nd hole after blowing and beating uniformly, and repeating the steps, sucking 100 mu L from the 10 th hole and discarding;
(5) adding 100 mu L of diluted bacterium liquid into the 1 st to 11 th holes, and adding 200 mu L of MH broth into the 12 th hole;
(6) repeating the steps (3) to (5) for three times;
(7) and putting the inoculated 96-well plate into a 37-degree incubator for incubation for 16-18h, sucking 10 mu L of 10mM/L resin azure with the concentration of 0.1mM/L, adding the resin azure into the hole, incubating for 2h, and reading the result.
As shown in table 2, the Mic value of turmeric essential oil is > 1%, bacteria are not inhibited from growing significantly at turmeric essential oil concentrations lower than the Mic value, and 1% turmeric essential oil concentration is finally selected as the uv enhancer, considering that the use cost of high-concentration turmeric essential oil is high and the turmeric essential oil is usually diluted to be used at low concentration in practical application.
TABLE 2 MIC of turmeric essential oil against ATCC25922 strain and concentrations selected for the experiment
| Experimental strains | Turmeric essential oil Mic | Concentration for experiment |
| ATCC 25922 | ＞1％ | 1％ |
Example 3 bactericidal effect of turmeric essential oil on ATCC25922 strain after 30 minutes:
1. experimental materials:
(1) test medium: the MH agar medium and the MacConkey agar medium (purchased from Guangdong Huancao Microscience Co., Ltd.) which were sterilized by autoclaving were cooled to 40 ℃, 20mL of the MH agar medium and the MacConkey agar medium were put into a sterile petri dish using a pipette, and naturally dried for 30min to obtain the MH agar medium and the MacConkey agar medium.
Coli standard strain ATCC25922 (laboratory collection).
2. Preparation work before the test:
(1) taking out the turmeric essential oil from the refrigerator, balancing to room temperature, and sucking part of turmeric essential oil for later use;
(2) the E.coli standard strain ATCC25922 was cultured on MacconyKa medium to a suitable size.
3. Evaluation experiment of bactericidal effect of turmeric essential oil:
(1) inoculating Escherichia coli ATCC25922, placing single colony in a centrifuge tube filled with 4mL MH broth, putting the centrifuge tube in a 37-degree shaking table, incubating for 4 hours at 180 revolutions, and taking out the centrifuge tube;
(2) placing the centrifuge tube in a centrifuge, centrifuging for 8min at 5000 rpm, pouring out supernatant, adding equal volume of physiological saline for resuspension, and performing gradient dilution to obtain final bacterial load of 106CFU/mL；
(3) Adding 1mL of bacterial liquid into a six-hole plate, adding 10 mu L of turmeric essential oil with the original concentration, and uniformly mixing to ensure that the final concentration of the essential oil is 1%;
(4) setting a control, a blank control and a 1% turmeric essential oil group for treatment for 30 min;
(5) and (3) sucking 100 mu L of bacterial liquid, adding the bacterial liquid into a 2ml centrifuge tube filled with 900 mu L of 0.85% physiological saline, carrying out gradient dilution, sucking 25 mu L of the diluted bacterial liquid, dripping the diluted bacterial liquid on an MH agar culture medium, incubating the bacterial liquid in a 37-degree incubator for 16-18h, counting, and carrying out statistical analysis after three biological repetitions of experimental results.
The results are shown in table 3, the number of bacteria in the blank control group is not obviously different from the number of bacteria in the group which has the turmeric essential oil and acts for 30 min; it is demonstrated that 1% turmeric essential oil did not produce a change in bacterial count after 30min treatment with ATCC25922 bacteria. It was shown that 1% turmeric essential oil had a weak bactericidal effect on ATCC25922, so 1% turmeric essential oil was finally selected as the final condition in combination with uv light for 30 min.
TABLE 3 fungicidal Effect of turmeric essential oil on ATCC25922 Strain
Example 4 evaluation of the killing effect of UV and UV potentiators on E.coli ATCC25922
1. Experimental materials:
(1) the ultraviolet lamp used for the test is PHILIPS TL-D brand; wattage: 18W; voltage: 220V; wavelength: (UVA)300-469 nm; tube diameter of the lamp tube: 25 mm; length: 60 cm.
(2) Test medium: the MH agar medium and the MacConkey agar medium (purchased from Guangdong Huancao Microscience Co., Ltd.) which were sterilized by autoclaving were cooled to 40 ℃, 20mL of the MH agar medium and the MacConkey agar medium were put into a sterile petri dish using a pipette, and naturally dried for 30min to obtain the MH agar medium and the MacConkey agar medium.
Coli standard strain ATCC25922 (laboratory collection).
2. Preparation work before the test:
(1) starting an ultraviolet lamp and continuously irradiating for 30 minutes for preheating;
(2) taking out the turmeric essential oil from the refrigerator, balancing to room temperature, and sucking part of turmeric essential oil for later use;
(3) the E.coli standard strain ATCC25922 was cultured on MacconyKa agar medium to a suitable size.
3. Ultraviolet synergist effect evaluation experiment:
(1) inoculating Escherichia coli ATCC25922, placing single colony in a centrifuge tube filled with 4mL MH broth, putting the centrifuge tube in a 37-degree shaking table, incubating for 4 hours at 180 revolutions, and taking out the centrifuge tube;
(2) placing the centrifuge tube in a centrifuge, centrifuging for 8min at 5000 rpm, pouring out supernatant, adding equal volume of physiological saline for resuspension, and performing gradient dilution to obtain final bacterial load of 106CFU/mL；
(3) Adding 1mL of bacterial liquid into a six-hole plate, adding 10 mu L of turmeric essential oil with the original concentration, and uniformly mixing;
(4) setting contrast, blank contrast, treating with 1% essential oil for shading, placing into ultraviolet irradiation box, and irradiating with ultraviolet for 30 min;
(5) after the ultraviolet irradiation is finished, 100 mu L of bacterial liquid is absorbed and added into a 2ml centrifuge tube filled with 900 mu L of 0.85% physiological saline for gradient dilution, 25 mu L of bacterial liquid is absorbed and dropped on an MH agar culture medium after dilution, the culture box with the temperature of 37 ℃ is incubated for 16-18h, counting is carried out, and the statistical analysis is carried out after the experimental result is repeated through three biology.
In this experiment, a growth control group, an ultraviolet control group, an essential oil control group and an ultraviolet essential oil test group were set, and the test was carried out according to the method of example 1, and the results are shown in FIG. 1.
The results are shown in Table 4 and FIG. 1, and the bacteria in the blank control group grow normally, indicating that Escherichia coli ATCC25922 can grow normally under the experimental conditions; under the irradiation of an ultraviolet lamp for 30min, the Escherichia coli ATCC25922 is not obviously reduced compared with a blank control group, which shows that the inhibition effect of the ultraviolet lamp on the Escherichia coli ATCC25922 is not obvious; the same results also show that 1% turmeric essential oil has no significant inhibitory effect on escherichia coli ATCC 25922; the combined action result of 30min shows that the synergistic effect of the ultraviolet rays and 1% of turmeric essential oil has obvious bactericidal effect on escherichia coli ATCC 25922.
TABLE 4 Bactericidal Effect of UV and turmeric essential oil combination on ATCC25922 Strain
The embodiments of the present invention have been described in detail, 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 (6)
1. The turmeric essential oil is used as an ultraviolet sterilization synergist, wherein the ultraviolet sterilization object is escherichia coli, and the preservation number is ATCC 25922.
2. The method for sterilizing by combining ultraviolet with turmeric essential oil is characterized in that the irradiation time of ultraviolet is 30min, the concentration of turmeric essential oil is 1%, the sterilization object is escherichia coli, and the preservation number is ATCC 25922.
3. The method of claim 2, wherein the UV intensity is 2.4-3.0mW/cm2。
4. The method of claim 3, wherein the pre-heating is performed for 30min before the UV irradiation.
5. The method of claim 4, comprising the steps of:
(1) mixing the bacterial liquid with 1% of turmeric essential oil, placing the mixture in a six-hole plate, and setting ultraviolet irradiation conditions: wavelength range of 300-460nm, power of 18W, distance from the six-hole plate to the ultraviolet lamp tube of 8cm, and ultraviolet intensity of 2.4-3.0mW/cm2；
(2) Preheating the ultraviolet box for 20-40min, and placing the six-hole plate in the ultraviolet box for irradiating for 25-35 min.
6. The method for sterilizing by combining ultraviolet rays and turmeric essential oil according to claim 5, wherein the final concentration of the bacterial liquid in step (1) is 106CFU/mL。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011429743.2A CN112640923B (en) | 2020-12-09 | 2020-12-09 | Application of turmeric essential oil as ultraviolet sterilization synergist |
| PCT/CN2021/118335 WO2022121420A1 (en) | 2020-12-09 | 2021-09-14 | Ultraviolet sterilization synergist and sterilization method using same in combination with ultraviolet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011429743.2A CN112640923B (en) | 2020-12-09 | 2020-12-09 | Application of turmeric essential oil as ultraviolet sterilization synergist |
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| CN112640923A CN112640923A (en) | 2021-04-13 |
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| CN113842481B (en) * | 2021-09-29 | 2023-03-17 | 华南农业大学 | Ultraviolet sterilization synergist lime essential oil and application thereof |
| CN113907094B (en) * | 2021-09-29 | 2022-10-28 | 华南农业大学 | Ultraviolet sterilization synergist-France cypress essential oil and application thereof |
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| 三种植物精油的成分分析及其抑菌活性比较;孙达等;《现代食品科技》;20201012;第36卷(第11期);第104-113页 * |
| 紫外线对自来水中微生物的灭活作用;张永吉等;《中国给排水》;20050930;第21卷(第9期);第1-4页 * |
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