Method for determining the concentration of an L-amino acid in fermentation
First Claim
1. A method for determining the concentration of a L-amino acid in a culture medium or cultured broth solution which comprises:
- contacting said culture anaerobically with a microbial electrode comprising a fixed or immobilized microorganism capable of anaerobically decarboxylating said L-amino acid and thereby liberating carbon dioxide into said culture, and a carbon dioxide gas sensitive electrode;
electrochemically measuring the liberation of carbon dioxide into said culture with said electrode and thereby correspondingly determining the concentration of said L-amino acid in said culture.
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Abstract
Electrochemical method for determining the concentration of a carbon source and L-amino acid in a fermentation medium or cultured broth by contacting a microbial electrode consisting of an oxygen-sensitive electrode or a carbon dioxide gas-sensitive electrode combined with fixed microbial cells of a micro-organism capable of assimilating said carbon source or decarboxylating said L-amino acid with a sample solution and sensing electrically the rate of current decrease which is caused by the consumed oxygen in the solution in proportion to the concentration of carbon source; or the electric motive force which is caused by the liberation of carbon dioxide in the sample solution in proportion to the concentration of L-amino acid. Microbial electrodes and systems useful in carrying out the aforementioned method.
12 Citations
5 Claims
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1. A method for determining the concentration of a L-amino acid in a culture medium or cultured broth solution which comprises:
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contacting said culture anaerobically with a microbial electrode comprising a fixed or immobilized microorganism capable of anaerobically decarboxylating said L-amino acid and thereby liberating carbon dioxide into said culture, and a carbon dioxide gas sensitive electrode; electrochemically measuring the liberation of carbon dioxide into said culture with said electrode and thereby correspondingly determining the concentration of said L-amino acid in said culture. - View Dependent Claims (2, 3, 4, 5)
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Specification