Method for preparing organic acid by fed-batch-feeding carbon source substrate and base
First Claim
1. A method for producing an organic acid by fed-batch culture, comprising:
- (i) preparing a culture medium containing a carbon source substrate, an organic acid-producing strain of bacteria, and a growth ingredient for said strain of bacteria;
(ii) fermenting said culture medium to produce said organic acid;
(iii) measuring a pH change in said culture medium;
(iv) correlating said pH change to consumption of said carbon source substrate;
(v) fed-batch feeding additional substrate-base mixture of carbon source substrate and an alkali metal containing weak base to said culture medium in an amount to maintain concentration of said carbon source substrate, and said alkali metal containing weak base in an amount to matain optimal pH for growth of said strain of bacteria, and(vi) removing any organic acid produced in said culture medium;
wherein ratio of carbon source substrate to alkali metal containing weak base is 200˜
300 g/L to 80˜
120 g/L,wherein CO2 and H2 gases are generated during said fermenting, and when CO2 and H2 gases reach a generation rate of 1.5-2.5 L/L of fermenter/hr, terminating the feeding the substrate-base mixture so that said fermenting proceeds until said carbon source substrate is completely consumed.
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Abstract
The present invention provides a fed-batch culture method comprising a step of fed-batch-feeding a carbon source base and a base in such a manner that the pH level can be maintained at a level suitable for the growth of microorganisms for fermentation of a carbon source. The present invention also provides a method for preparing organic acids using the fed-batch culture method. The present invention fed-batch-feeds a neutralizing agent such as ammonium bicarbonate, ammonium carbonate or alkali metal-containing weak base, and a carbon source substrate in preparing organic acids by microorganism fermentation. Thus, a pH level suitable for the survival of microorganisms for carbon source fermentation can be maintained, and the speed of injecting the carbon source base which is the source material can be appropriately adjusted. The present invention may improve productivity, yield rate and concentration of organic acids and may automatically inject a base and a carbon source substrate according to a variation in the pH level, thus improving reliability and convenience of a fermentation process operation.
5 Citations
9 Claims
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1. A method for producing an organic acid by fed-batch culture, comprising:
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(i) preparing a culture medium containing a carbon source substrate, an organic acid-producing strain of bacteria, and a growth ingredient for said strain of bacteria; (ii) fermenting said culture medium to produce said organic acid; (iii) measuring a pH change in said culture medium; (iv) correlating said pH change to consumption of said carbon source substrate; (v) fed-batch feeding additional substrate-base mixture of carbon source substrate and an alkali metal containing weak base to said culture medium in an amount to maintain concentration of said carbon source substrate, and said alkali metal containing weak base in an amount to matain optimal pH for growth of said strain of bacteria, and (vi) removing any organic acid produced in said culture medium; wherein ratio of carbon source substrate to alkali metal containing weak base is 200˜
300 g/L to 80˜
120 g/L,wherein CO2 and H2 gases are generated during said fermenting, and when CO2 and H2 gases reach a generation rate of 1.5-2.5 L/L of fermenter/hr, terminating the feeding the substrate-base mixture so that said fermenting proceeds until said carbon source substrate is completely consumed. - View Dependent Claims (2, 3, 6, 7, 8, 9)
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4. A method for producing butyric acid by fed-batch culture, comprising;
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(i) preparing a culture medium containing a carbon source substrate, a butyric acid-producing strain of bacteria, and a growth ingredient for the strain of bacteria; (ii) fermenting said culture medium to produce said butyric acid; (iii) measuring a pH change in said culture medium; (iv) correlating said pH change to consumption of said carbon source substrate; (v) fed-batch feeding additional substrate-base mixture of carbon source substrate and at least one base selected from the group consisting of ammonium bicarbonate, sodium bicarbonate, potassium bicarbonate, ammonium carbonate, sodium carbonate, potassium carbonate and mixture thereof, in an amount to matain a pH of said culture medium to have a pH of 4.5 to 7; and (vi) removing any butyric acid produced in said culture medium; wherein ratio of carbon source substrate to said at least one base is 200˜
300 g/L to 80˜
120 g/L,wherein CO2 and H2 gases are generated during said fermenting, and when CO2 and H2 gases reach a generation rate of 1.5-2.5 L/L of fermenter/hr, terminating feeding said substrate-base mixture so that said fermenting proceeds until the carbon source substrate is completely consumed. - View Dependent Claims (5)
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Specification