CN100558884C - A kind of acid-producing Klebsiella bacterium and application thereof - Google Patents
A kind of acid-producing Klebsiella bacterium and application thereof Download PDFInfo
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- CN100558884C CN100558884C CNB2007100216415A CN200710021641A CN100558884C CN 100558884 C CN100558884 C CN 100558884C CN B2007100216415 A CNB2007100216415 A CN B2007100216415A CN 200710021641 A CN200710021641 A CN 200710021641A CN 100558884 C CN100558884 C CN 100558884C
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- butyleneglycol
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Abstract
The invention discloses a kind of acid-producing Klebsiella bacterium and application thereof.This acid-producing Klebsiella bacterium preserving number is CCTCCNO:M 207023, utilize this acid-producing Klebsiella bacterium biosynthesizing 2,3-butyleneglycol and the method that reduces by product production of organic acids in this process are to adopt ultraviolet ray and ethyl sulfate Combined Processing bacterial strain CCTCC NO:M 207023, inoculation after will handling is then cultivated to the selectivity solid medium that contains Sodium Bromide and sodium bromate, after genetic stability is investigated, picking list bacterium colony carries out fermentative preparation 2, the 3-butyleneglycol.The present invention is simple to operate and workload is few, does not relate to genetic manipulation, and cost is lower, efficient height and cycle are short, can reduce biosynthesizing 2, the by product lactic acid in the 3-butyleneglycol process and the output of acetate in slewing ground, improve the utilization ratio and 2 of substrate, the yield of 3-butyleneglycol.
Description
Technical field
The invention belongs to technical field of bioengineering, relate to a kind of acid-producing Klebsiella bacterium, utilize this acid-producing Klebsiella bacterium biosynthesizing 2, the 3-butyleneglycol also reduces the method for by product production of organic acids in this process, and this acid-producing Klebsiella bacterium is 2, the application in the 3-butyleneglycol biosynthetic process.
Background technology
2, the 3-butyleneglycol is widely used in a plurality of fields (Syu M J.ApplMicrobiol Biotechnol, 2001,55 (1): 10-18) such as chemical industry, food, fuel and aerospace.Its dewatered product methylethylketone is a kind of lower boiling solvent, can be applicable to industries such as coating, binding agent, lubricant, dyestuff, printing ink, can be used as the intermediate of organic synthesis spices, oxidation inhibitor etc. simultaneously again; Dewatered product 1,3-butadiene after the esterification is a kind of important petrochemical complex basic organic material and synthetic rubber monomer; Concentrate the octane isomer that forms after the dehydrogenation with methylethylketone, can be used to produce senior aviation with oily; The derivative 3-oxobutanol (acetoin) and the dimethyl diketone of its high value are widely used in industries such as food, spices and makeup; Simultaneously because of its calorific value higher (27,200kJ/kg), same ethanol (29,100kJ/kg) suitable, can be used as fuel dope and use.Chirality 2,3-butyleneglycol also can be used as the chiral support of medicine and the chiral additives of liquid crystal material (Garg S, Jain A.Bioresour Technol, 1995,51 (2): 103-109) except above purposes.
Chemical method produces 2 at present, the 3-butyleneglycol, the hydrocarbon polymer (main component be the butane of 77% butylene and 23% and the mixture of Trimethylmethane) that mainly is the four carbon classes that produce during with petroleum cracking is a raw material, after the oxidation of butylene process HClO in the mixture and the effect of NaOH, hydrolysis obtains several different types of butyleneglycols (2 under High Temperature High Pressure, 3-butyleneglycol and 1,2-butyleneglycol etc.), separate and then by the method for vacuum fractionation and to obtain.And some bacterium of occurring in nature has product 2, the ability of 3-butyleneglycol, mainly comprise Klebsiella (Klebisella), bacillus (Bacillus), enterobacter (Afschar A S such as (Enterobacter), Vaz Rossell C E, Jonas R, et al.J Biotechnol, 1993,27 (3): 317-329).In these bacteriums, the bacillus polymyxa Bacillus polymyxa of the acid-producing Klebsiella bacterium Klebsiella oxytoca of Klebsiella and bacillus demonstrates higher production 2, the potentiality of 3-butyleneglycol, especially the former, because have broad substrate scope and culture condition had advantage such as good adaptive faculty, so through being usually used in biosynthesizing 2, the research of 3-butyleneglycol (Jansen N B, Flickinger M C, Tsao G T.BiotechnolBioeng, 1984,26 (4): 362-369).Though and the latter produces 2, the ability of 3-butyleneglycol is not as good as the former, and it can secreting amylase, thereby can directly utilize the starchy material fermentation to produce 2, the 3-butyleneglycol; And this bacterial strain produce 2, in the 3-butyleneglycol, mainly be 2 of D type, 3-butyleneglycol (Mas C D, Jansen N B, Tsao G T.Biotechnol Bioeng, 1988,31 (3): 366-377), be usually used in preparing chirality 2, the 3-butyleneglycol, thereby also be Production by Microorganism Fermentation 2, one of popular bacterial strain of 3-butyleneglycol.2, the principal feature of 3-butyleneglycol fermentation has: 2, and the 3-butyleneglycol is little to the toxicity of bacterial strain, thereby can carry out the fermentative production of high density in fermentor tank; With Klebsiella oxytoca is 2 of representative, the production bacterial strain of 3-butyleneglycol not only can utilize various main carbohydrates (hexose, pentose and some disaccharides etc.), the uronic acid that can also utilize Mierocrystalline cellulose and hydrolysis of hemicellulose to produce, the substrate spectrum is very broad.2, the cost of the chemical synthesis process of 3-butyleneglycol is compared much higher with biological process, and compares with biological process, and the chemical method process is loaded down with trivial details, and is not easy to operate, so be difficult to realize large-scale industrial production always, its purposes is not developed fully yet.Prepare 2 with biological process, the 3-butyleneglycol had both met the requirement of green chemical industry, can overcome the difficulty that chemical method is produced again, can realize simultaneously human society production by traditional be that the refining of petroleum of raw material is to the biorefinery transition (Ragauskas A J, Williams C K, the Davison B H that are raw material with the renewable biomass resource with non-renewable fossil resource, et al.Science, 2006,311 (5760): 484-498), reduce dependence gradually to exhausted day by day petroleum resources.In recent years, soaring day by day along with oil price is with Production by Microorganism Fermentation 2, the 3-butyleneglycol, and its series derivates developed and applied caused people's attention (Syu M J.Appl Microbiol Biotechnol, 2001,55 (1): 10-18) gradually.
Klebsiella oxytoca is as 2, the best of 3-butyleneglycol is produced one of bacterial strain, in biosynthesizing 2, via a kind of mixing acid pathways metabolism, the end product of fermentation is except 2, outside the 3-butyleneglycol in the 3-butyleneglycol process, also have a certain amount of by product organic acid (acetate, lactic acid, formic acid etc.) to produce (Jansen N B, Tsao G T.Adv Biochem Eng Biotechnol, 1983,27:85-99).These organic acids produce, and have not only reduced the transformation efficiency of substrate, and can cause fermented liquid pH value decline in the fermenting process, are unfavorable for microbial growth, influence the metabolism of somatic cells, thereby are unfavorable for 2, the biosynthesizing of 3-butyleneglycol.Therefore, reduce Klebsiella oxytoca biosynthesizing 2, by product organic acid content helps to improve the utilization ratio and 2 of substrate, the productive rate of 3-butyleneglycol in the 3-butyleneglycol process.
Summary of the invention
The purpose of this invention is to provide a kind of Synthetic 2, the acid-producing Klebsiella bacterium of 3-butyleneglycol (Klebsiella oxytoca).
Another object of the present invention provides utilizes above-mentioned acid-producing Klebsiella bacterium Synthetic 2, and the 3-butyleneglycol also reduces the method for by product production of organic acids.
A further object of the invention provides above-mentioned acid-producing Klebsiella bacterium and is reducing 2 of by product production of organic acids, the application in the biosynthesizing of 3-butyleneglycol.
The present invention uses bacterial strain Klebsiella oxytoca ME-303 (CCTCC NO:M 207023) biosynthesizing 2, the 3-butyleneglycol, this bacterial strain is in biosynthesizing 2, the by product kind that produces in the 3-butyleneglycol process is few than the by product kind of disclosed other acid-producing Klebsiella bacteriums of prior art, main two kinds of acidic by-products lactic acid and the acetate of producing, and also the product acid amount than other acid-producing Klebsiella bacteriums is few to produce the acid amount.Because acidic by-products causes the pH value of fermented liquid in the fermenting process constantly to descend, influence in the strain cell and target product 2, the activity of 3-butyleneglycol biosynthesizing related enzyme systems, thereby be unfavorable for 2, the biosynthesizing of 3-butyleneglycol, and these organic acid production of by-products have also reduced substrate conversion to target product 2, the transformation efficiency of 3-butyleneglycol.Problem at above existence, the present invention utilizes ultraviolet ray and ethyl sulfate (DES) that bacterial strain CCTCC NO:M 207023 is carried out selectivity solid medium slewing ground this bacterial strain biosynthesizing 2 of reduction that contains Sodium Bromide and sodium bromate of Application Design after the Combined Processing, two kinds of organic acid by products in the 3-butyleneglycol process.
The objective of the invention is to realize by following technical measures:
A kind of acid-producing Klebsiella bacterium, its classification called after acid-producing Klebsiella bacterium (Klebsiella oxytoca) ME-303, in China's typical culture collection center preservation, deposit number is: CCTCC NO:M 207023.
Utilize described acid-producing Klebsiella bacterium CCTCC NO:M 207023 biosynthesizing 2, the 3-butyleneglycol, and reduce the method for by product production of organic acids in this process, it is characterized in that adopting ultraviolet ray and ethyl sulfate (DES) Combined Processing bacterial strain CCTCC NO:M 207023, inoculation after will handling is then cultivated to the selectivity solid medium that contains Sodium Bromide and sodium bromate, and after genetic stability was investigated, picking list bacterium colony fermented, preparation 2, the 3-butyleneglycol.
Adopting ultraviolet ray and ethyl sulfate (DES) Combined Processing bacterial strain in the described method is that to adopt intensity be that to adopt final concentration by mass percentage behind uviolizing 2～5min of 15～30w again be DES processing 20～50min of 0.5%～2%.
The selectivity solid medium that contains Sodium Bromide and sodium bromate in the described method is to add a certain amount of glucose, Sodium Bromide and sodium bromate mixture in common LB solid medium, and wherein the mol ratio of Sodium Bromide and sodium bromate is 1: 1～5: 1.
In the described method in the selectivity solid medium concentration of glucose be 10～100g/L, the concentration of Sodium Bromide is 200～900mmol/L, the concentration of sodium bromate is 50～225mmol/L.
Described acid-producing Klebsiella bacterium is reducing 2 of by product production of organic acids, the application in the biosynthesizing of 3-butyleneglycol.
Below be the detailed description of technical solution of the present invention:
The present invention adopts in biosynthesizing 2, the few acid-producing Klebsiella bacterium CCTCCNO:M 207023 of by product kind in the 3-butyleneglycol process, and with bacterial strain CCTCC NO:M 207023 bacteria suspensions through the ultraviolet ray and the ethyl sulfate Combined Processing after, coating is cultivated in the selectivity solid medium, and it is less or do not produce organic acid that the bacterium colony that can survive promptly produces organic acid.
One, the design of selectivity solid medium
In the present invention, designed a kind of selectivity solid medium, in the LB solid medium, add a certain amount of glucose and Sodium Bromide-sodium bromate mixture (mol ratio of Sodium Bromide and sodium bromate is 1: 1～5: 1), the concentration of preferred glucose is 10～100g/L, the concentration of Sodium Bromide is 200～900mmol/L, and the concentration of sodium bromate is 50～225mmol/L.When bacterial strain CCTCC NO:M 207023 grows in the selectivity solid medium, utilize glucose wherein to generate organic acid as carbon source, the proton (H that organic acid dissociates
+) with the selectivity solid medium in bromate ion (BrO
3 -) and bromide anion (Br
-) take place to generate the simple substance bromine that microorganism strains is had fatal toxic action suc as formula the chemical reaction shown in (1) and the formula (2); Utilize this method (produce proton participatory (1) that the more bacterial strain self of acid produces and the generation of the chemical reaction shown in the formula (2) simple substance bromine " kill " extremely self).
(1)BrO
3 -+2Br
-+H
+→Br
2+BrO
2 -+H
2O
(2)BrO
2 -+2Br
-+H+→Br
2+BrO
-+H
2O
Two, ultraviolet ray and ethyl sulfate Combined Processing
The concrete operations step is: get and cultivate 4 on plentiful bacterial strain CCTCC NO:M 207023 inclined-planes of 10～20h growth, with the 10mL stroke-physiological saline solution lawn is washed, pour an aseptic Boiling tube into.Test tube 20～the 50s that vibrates on shaker mixer is broken up the bacterium piece, and the centrifugal 10～20min of 8000r/min abandons supernatant, makes bacteria suspension, and in the microscopically direct census, adjusting cell concn is 1～5 * 10 with blood counting chamber
8Individual/mL, as pending bacterium liquid, getting 2～8mL is added in the sterile petri dish that diameter is 6cm, and put into aseptic magnetic stirring apparatus, in distance is that 10～40cm power is to stir irradiation 2～5min under 15～30w ultraviolet lamp, getting this bacteria suspension 3～10mL is inoculated in the 250mL triangular flask that 50mL LB liquid nutrient medium is housed, after 37 ℃ of lucifuges are cultivated 10～20h, get the centrifugal 10～20min of 10mL nutrient solution 8000r/min, abandon supernatant, phosphoric acid buffer washed twice with 20mL 0.1mol/L pH 7.0, make bacteria suspension with the phosphoric acid buffer of original volume at last, draw the 5mL bacteria suspension to the 50mL triangular flask, and the phosphoric acid buffer that adds 15mL 0.1mol/LpH 7.0 is made and is about 10
8The bacteria suspension of individual/mL, add 0.2～0.8mL DES ethanolic soln (0.5g/mL) again, making the final concentration of DES in bacteria suspension is 0.5%～2% (mass percent), the hypo solution termination reaction that adds 0.2～0.8mL 25% behind 20～50min is immediately handled in concussion, does a series ofly to be diluted to 10 with 10 times of dilution methods then
-5, get 0.5mL and be applied on the selectivity solid medium, behind cultivation 10～20h, collect single bacterium colony, continuation is streak culture on same selectivity solid medium, and 5～10 generations of cultured continuously, the survival bacterium colony of selecting inheritance stability was standby to investigate the genetic stability of survival bacterium colony.
Three, fermentation checking
The bacterium colony that picking can be survived on the selectivity flat board after ultraviolet ray and ethyl sulfate Combined Processing and empirical tests heredity is more stable carries out the batch fermentation checking, and adopt undressed CCTCC NO:M 207023 to compare, at certain fermentation condition bottom fermentation 36～54h, target product 2 in the fermented liquid when measuring the fermentation termination with the HPLC method, the output of 3-butyleneglycol and two kinds of acidic by-products lactic acid and acetate compares analysis.
Beneficial effect of the present invention:
The present invention is simple to operate and workload is few, do not relate to genetic manipulation, cost is lower, efficient height and cycle are short, can reduce bacterial strain CCTCC NO:M 207023 biosynthesizing 2, the by product lactic acid in the 3-butyleneglycol process and the output of acetate in slewing ground, improve the utilization ratio and 2 of substrate, the yield of 3-butyleneglycol further reduces biological process preparation 2, the cost of 3-butyleneglycol.
Biomaterial preservation information:
Acid-producing Klebsiella bacterium, its classification called after acid-producing Klebsiella bacterium (Klebsiella oxytoca) ME-303, (be called for short: CCTCC in China's typical culture collection center preservation, address: China. Wuhan. Wuhan University), preservation date on March 16th, 2007, deposit number is CCTCC NO:M 207023.
Embodiment
The invention will be further elaborated by the following examples.
General explanation:
LB liquid nutrient medium (g/L): peptone 10, yeast extract paste 5, NaCl 10, and pH 7.0～7.2.
LB solid medium (g/L): peptone 10, yeast extract paste 5, NaCl 10, agar 15, pH 7.0～7.2.
Selectivity solid medium (g/L): glucose 10-100, peptone 10, yeast extract paste 5, NaCl 10, agar 15, and (mol ratio is 1: 1～5: 1 to Sodium Bromide+sodium bromate, the concentration of Sodium Bromide is 200～900mmol/L, and the concentration of sodium bromate is 50～225mmol/L).
Fermention medium (g/L): glucose 100, MgSO
47H
2O 0.25, FeSO
47H
2O 0.05, ZnSO
47H
2O0.001, MnSO
4H
2O 0.001, CaCl
20.01, K
2HPO
43H
2O 13.7, KH
2PO
42.0, (NH
4)
2HPO
43.3, (NH
4)
2SO
46.6
More than various substratum all at 115～121 ℃ of following sterilization 15～20min (during wherein at preparation selectivity solid medium, sodium bromate solution is prepared separately, adds after the sterilization again, and mixing falls dull and stereotyped).
Fermentation condition: fermenting process is at 5L automatic fermenter (NBS, New Brunswick, USA) carry out in, liquid amount 3L, and inoculum size 5% (be every 3L fermented liquid inoculation 150mL seed liquor, always the take the logarithm vegetative period seed liquor of (incubation time is about 12h) of the seed liquor during inoculation, its concentration is certain), 37 ℃ of leavening temperatures, rotating speed are 200r/min, oxygen supply speed 0.7vvm.
The HPLC measuring method of substrate, product and by-products content: residual substrate glucose, product 2 in the fermented liquid, 3-butyleneglycol and various acidic by-products such as lactic acid and acetate etc. adopt DIONEX summit P680 high performance liquid chromatograph to measure.Chromatographic column is an Aminex HPX-87H post (Bio-Rad), and column temperature is 60 ℃, and detector is a SHODEX RI-101 refractive power differential detector, and moving phase is 0.005mol/L H
2SO
4, flow velocity is 0.2mL/min, sample size is 20 μ L.
The genetic stability measuring method of bacterium colony: with bacterium colony 5～10 generations of cultured continuously on the selectivity solid medium, observe its growing state, still can give birth to the elder and be inheritance stability.
Embodiment 1
Step 1: ultraviolet ray and ethyl sulfate (DES) Combined Processing bacterial strain CCTCC NO:M 207023.
Get and cultivate 4 on plentiful Klebsiella oxytoca CCTCC NO:M 207023 inclined-planes (slant medium is the LB solid medium) of 12h growth, lawn is washed, pour an aseptic Boiling tube into the 10mL stroke-physiological saline solution.The test tube 30s that vibrates on shaker mixer is broken up the bacterium piece, and the centrifugal 15min of 8000r/min abandons supernatant, makes bacteria suspension, and in the microscopically direct census, adjusting cell concn is 10 with blood counting chamber
8Individual/mL, as pending bacterium liquid, getting the pending bacterium liquid of 5mL is added in the sterile petri dish that diameter is 6cm, and put into aseptic magnetic stirring apparatus, is to stir irradiation 2min under the 15w ultraviolet lamp in distance for 30cm power, getting this bacteria suspension 5mL is inoculated in the 250mL triangular flask that 50mL LB liquid nutrient medium is housed, after 37 ℃ of lucifuges are cultivated 12h, get the centrifugal 15min of 10mL nutrient solution 8000r/min, abandon supernatant, phosphoric acid buffer washed twice with 20mL 0.1mol/L pH 7.0, use the phosphoric acid buffer of original volume (20mL) to make bacteria suspension at last, draw the 5mL bacteria suspension to the 50mL triangular flask, and the phosphoric acid buffer that adds 15mL 0.1mol/L pH 7.0 is made and is about 10
8The bacteria suspension of individual/mL, add 0.4mLDES ethanolic soln (0.5g/mL) again, making the concentration of DES in bacteria suspension is 1%, and the hypo solution termination reaction that adds 0.5mL 25% behind the 30min is immediately handled in concussion, does a series ofly to be diluted to 10 with 10 times of dilution methods then
-5, get 0.5mL and coat the selectivity solid medium (glucose concn that adds to the LB solid medium is 50g/L; The mol ratio of Sodium Bromide and sodium bromate is 4: 1, and concentration is respectively 500mmol/L and 125mmol/L) cultivate.
Step 2: fermentation checking
The single bacterium colony that picking is survived in the selectivity solid medium, continuation is streak culture on same selectivity solid medium, through 5 generations of cultured continuously after investigating genetic stability, picking list colony inoculation ferments (fermentation condition see general explanation) in fermention medium, ferments 54 hours, get the centrifugal 15min of 5mL fermented liquid 8000r/min after, analyze in the supernatant 2 with HPLC, 3-butyleneglycol and by-product acetic acid and concentration of lactic acid compare with result before the processing, and the result is as shown in table 1.The result shows under identical fermentation condition bacterial strain CCTCC NO:M 207023 after treatment 2,3-butyleneglycol output is up to 41.7g/L, before handling, increased by 7.89%, and the output of corresponding by product organic acid lactic acid and acetate has descended 89.09% and 92.24% respectively.
Table 1
Embodiment 2
Step 1: with embodiment 1
Step 2: fermentation checking
The single bacterium colony that picking is survived in the selectivity solid medium, continuation is streak culture on same selectivity solid medium, through 5 generations of cultured continuously after investigating genetic stability, picking list colony inoculation ferments (fermentation condition see general explanation) in fermention medium, ferments 54 hours, get the centrifugal 15min of 5mL fermented liquid 8000r/min after, analyze in the supernatant 2 with HPLC, 3-butyleneglycol and by-product acetic acid and concentration of lactic acid compare with result before the processing, and the result is as shown in table 2.The result shows under identical fermentation condition bacterial strain CCTCC M 207023 after treatment 2,3-butyleneglycol output is up to 40.53g/L, before handling, increased by 4.86%, and the output of corresponding by product organic acid lactic acid and acetate has descended 67.88% and 72.41% respectively.
Table 2
Embodiment 3
Step 1: with embodiment 1
Step 2: fermentation checking
The single bacterium colony that picking is survived in the selectivity solid medium, continuation is streak culture on same selectivity solid medium, through 5 generations of cultured continuously after investigating genetic stability, picking list colony inoculation ferments (fermentation condition see general explanation) in fermention medium, ferments 54 hours, get the centrifugal 15min of 5mL fermented liquid 8000r/min after, analyze in the supernatant 2 with HPLC, 3-butyleneglycol and by-product acetic acid and concentration of lactic acid compare with result before the processing, and the result is as shown in table 2.The result shows under identical fermentation condition bacterial strain CCTCC M 207023 after treatment 2,3-butyleneglycol output is up to 40.8g/L, before handling, increased by 5.56%, and the output of corresponding by product organic acid lactic acid and acetate has descended 61.82% and 79.31% respectively.
Table 3
Embodiment 4
Step 1: with embodiment 1
Step 2: fermentation checking
The single bacterium colony that picking is survived in the selectivity solid medium, continuation is streak culture on same selectivity solid medium, through 5 generations of cultured continuously after investigating genetic stability, picking list colony inoculation ferments (fermentation condition see general explanation) in fermention medium, ferments 54 hours, get the centrifugal 15min of 5mL fermented liquid 8000r/min after, analyze in the supernatant 2 with HPLC, 3-butyleneglycol and by-product acetic acid and concentration of lactic acid compare with result before the processing, and the result is as shown in table 2.The result shows under identical fermentation condition bacterial strain CCTCC M 207023 after treatment 2,3-butyleneglycol output is up to 40g/L, before handling, increased by 3.49%, and the output of corresponding by product organic acid lactic acid and acetate has descended 66.67% and 62.07% respectively.
Table 4
Claims (1)
1, a kind of acid-producing Klebsiella bacterium, its classification called after acid-producing Klebsiella bacterium (Klebsiella oxytoca) ME-303, in China's typical culture collection center preservation, its deposit number is: CCTCC NO:M 207023.
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| CN101225408B (en) * | 2008-01-29 | 2012-05-16 | 清华大学 | Method for producing ethanol and 2,3-butanediol by lignocellulose material |
| CN102154384B (en) * | 2011-01-19 | 2013-03-06 | 山东大学 | Method for producing chiral pure (2S,3S)-2,3-butanediol |
| CA2879331A1 (en) * | 2012-07-17 | 2014-01-23 | Antonia Maria ROJAS MARTINEZ | Method for producing 2,3-butanediol using improved strains of raoultella planticola |
| CN102872955B (en) * | 2012-09-29 | 2016-01-20 | 佛山市海天(高明)调味食品有限公司 | A kind of cultural method of microbe in solid state culture medium |
| CN103045499A (en) * | 2012-10-31 | 2013-04-17 | 中国科学技术大学苏州研究院 | Acid-producing klebsiella oxytoca MOW-02-05, selection method and application of acid-producing klebsiella oxytoca MOW-02-05 |
| KR20190102898A (en) * | 2018-02-27 | 2019-09-04 | 지에스칼텍스 주식회사 | Composition containing 2,3-butanediol as effective ingredient |
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