魚類のジメチル-β-プロピオテチン含量に及ぼす飼料の影響

概要

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The relationship between a content of dimethyl-β-propiothetin (DMPT) as a precursor of dimethyl sulfide (DMS) in fish and DMPT levels in the fish diets was studied. Sardine, carp, and rainbow trout were fed with the diets containing low or high levels of DMPT, and then DMPT and DMS contents in fishes were determined. DMPT contents in muscle and viscera of sardine became very low after culturing with a low level DMPT diet. On the other hand, DMPT contents in carp and rainbow trout which generally contained low level DMPT increased rapidly when fed with a high level DMPT diet. DMPT accumulated in carp or rainbow trout decreased rapidly when the supply of DMPT had been stopped. And the maximum accumulation of DMPT in carp dorsal meat was observed when the carp had been fed with a high level DMPT diet. The formation of DMS from DMPT in live fish was not observed, however, when fish meat aboundant in DMPT was treated at high temperature, DMPT was decomposed into DMS. On the other hand, in the case of DMPT free fish meat, an obvious amount of DMS was not formed under the same treatment. Thus it seemed that the origin of DMS was limited. to DMPT in fish meat.
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