抄録
Amino acid composition of the protein of the external mucous substance from 6 kinds of fishes (2 fresh water and 4 sea water fishes) was determined by the column chromatographic method using an ion-exchange resin and the results obtained are shown in Table 1. Although some different features were observed on several amino acids, the pattern of amino acid distribution in the mucous proteins examined was similar to each other, all of them, except Dasyatis akajei, being rich in aspartic acid, leucine and glutamic acid, medium in valine, serine, isoleucine, threonine, phenylalanine and arginine, and poor in cystine, tyrosine, tryptophan and histidine. The mucous protein of Dasyatis akajei showed the considerably higher value of threonine and lower ones of leucine, methionine, alanine and arginine than those of the other fishes.
