Marine invertebrates consisting of 9 species of mollusks, 7 of crustaceans and 3 of echinoderms, were analyzed for ATP-related compounds, homarine, and trigonelline during ice storage. The determination was carried out by a newly improved HPLC system which made it possible to separate and micro-quantify the 9 authentic ATP-related compounds. The results showed that besides adenine nucleotides, IMP was detected at the range of 0.1 to 5.5 ƒÊmol/g in the muscles of all species
From the red alga, Ahnfeltia paradoxa, a new quaternary amine derivative of an empirical formula, C11H17NO4S, was isolated.The chemical structure of this compound was identified as candicine 0-sulfate [p-(2-trimethylaminoethyl) phenol O-sulfate] by chemical analysis, UV spectrum and synthesis.The occurrence of candicine O-sulfate was first demonstrated in natural source. The toxicity of candicine O-sulfate to mice was also examined.
In the methanolic extract from a red alga Grateloupia turuturu, L-methionine-l-sulfoxide, an unknown base and glutamic acid were predominant among free amino acids. On acid hydrolysis, the first two compounds disappeared and arginine, citrulline, ornithine and methionine appeared or increased concomitantly. Two methionine derivatives were then isolated from the extract by ion-exchange column chromatography, and identified as L-methionine-l-sulfoxide and N-methylmethionine sulfoxide by synthesis. The former sulfoxide was confirmed to be the origin of methionine appearing on acid hydrolysis.
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