Amino Acid Compositions and Peptides in the Extracts of Some Corallinaceae Algae

6種17検体のサンゴモ科海藻エキスの加水分解前後のアミノ酸組成を調べた。その結果、加水分解前にほ一般にalanine、glycineおよびtaurineの含量が比較的高かった。またL-baikiainをサンゴモ(Corallina officinalis)より分離同定し、これがサンゴモ科の海藻に広く分布することを認めた。加水分解後には全ての試料においてaspartic acidとglutamic acidを中心として著量のアミノ酸の増加が認められ、これら海藻エキス中にかなり多量のペプチッドの存在することが推定された。サンゴモのエキスのペプチッド成分を検索した結果、酸性および強酸性区分中にaspartic acidとglutamic acidを主要な構成成分とするかなり多数のペプチッドの存在が認められた。これらのうちα-aspartylisoleucineとα-aspartylleucineの存在を確認した。

Amino acid patterns before and after hydrolysis in several species of Corallinaceae algal extracts were examined by means of amino acid analyzers. Before hydrolysis, alanine, glycine and taurine were predominant in general. Occurrence of L-baikiain was also confirmed and its wide distribution in Corallinaceae algae was observed. These calcareous algal extracts showed a remarkable increase of amino acids after hydrolysis, especially aspartic acid and glutamic acid, suggesting the presence of a fairly large amount of peptides. In the examination of peptidyl compounds in C. officinalis, some acidic peptides mainly consisting of aspartic acid and glutamic acid were found to exist. Among them, occurrence of α-aspartylisoleucine and α-aspartylleucine was confirmed.