| abstract |
3, 4-Dihydroxyphenyl-L-alanine, L-tyrosine and 2, 4dihydroxyphenyl-L-alanine are obtained by the action of Beta tyrosinase produced by cultivation of certain microorganisms, on catechol, phenol and resorcin, and cysteine, cystine, serine and alanine, or ammonia and pyruvic acid, oxalacetic acid, fumaric acid, malic acid, maleic acid, maleic oxime, glyoxylic acid, lactic acid or these derivatives. |