Abstract
The possibilities of the biosynthesis of polyesters from 20 kinds of naturally occurring l-amino acids by Alcaligenes eutrophus were studied. It was found that several amino acids were used efficiently to synthesize copolyesters of 3-hydroxybutyrate (3HB) and 3-hydroxyvalerate (3HV) by A. eutrophus under the ‘loose nitrogen-limiting’ condition, but the other amino acids were scarcely utilized as a carbon source for the synthesis of polyesters. When l-threonine or l-isoleucine were used as the sole carbon source, copolyesters with higher 3HV content were produced.
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