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An enzymatic method using l-phenylalanine ammonia-lyase (EC 4.3.1.5) for the rapid conversion of trans-cinnamic acid to l-phenylalanine has been investigated. With Rhodotorula glutinis, enzyme activity as high as 0.3 U/ml of culture broth was obtained. The enzyme activity was kept stable for a relatively long time during cultivation by the addition of l-isoleucine. Optimization of the parameters of the conversion reaction resulted in accumulation of 18 mg of l-phenylalanine per ml of reaction mixture. The conversion yield from trans-cinnamic acid was about 70%. The method may provide a rapid and practical way to produce l-phenylalanine useful as an essential amino acid.

applied and environmental microbiology

Production of <scp>l</scp> -Phenylalanine from <i>trans</i> -Cinnamic Acid with <i>Rhodotorula glutinis</i> Containing <scp>l</scp> -Phenylalanine Ammonia-Lyase Activity

Production of l -Phenylalanine from trans -Cinnamic Acid with Rhodotorula glutinis Containing l -Phenylalanine Ammonia-Lyase Activity