Abstract
Three tryptophan-plus-tyrosine double auxotrophic mutants were isolated from a biotin-requiring glutamate-producingArthrobacter globiformis. The mutants were found to producel-phenylalanine in a mineral salt medium. Further improvement ofl-phenylalanine production was achieved by isolation of mutants resistant to β-2-thienylalanine from these double auxotrophs. Temperature of 30 °C and a 4% inoculum dose were found to be optimum for phenylalanine production. Addition of some trace salts does not enhance phenylalanine yield. Under optimal cultural conditions one mutant yielded 6.8 g phenylalanine per L medium in flask culture.
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