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...http://www.google.de/patents/US4299669?utm_source=gb-gplus-sharePatent US4299669 - Method for determining the concentration of an L-amino acid in fermentation
