Studies on the Irradiation Cleavage of Trimethylamine Oxide in Fish Flesh-I

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The flesh of TMAO-rich fishes, such as cod, Alaska pollack, shark and squid were subjected to gamma-ir-radiation at dosages from 0.6 to 5.6 Mrad, to see how TMAO, a specific constituent in marine fish, would undergo of its breakdown and if it would result in causing undesirable effect on the quality of irradiated fish.<BR>TMA, DMA, and FA were all identified in any sample of fish flesh irradiated, and a decomposition product of TMAO. An increase in the amount of ammonia was observed in the same samples after irradiation, but very little of ammonia was formed in TMAO solution. The difference in the amount of TMA produced by irradiation was not so apparent among the fishes by species.<BR>But, the formation of DMA was considerably large in the quantity, particularly in the flesh of gadoid fish. And, a remarkable difference in DMA level was noted between two individuals of Alaska pollack. A significant finding was that the amount of DMA in one of the irradiated flesh of Alaska pollack was extremely larger than the amount produced from pure TMAO solution under the same irradiation condition.<BR>The precursor of FA formed by irradiation of fish flesh would not be limited to TMAO, however, a comparatively large amount of "free" FA extracted from irradiated flesh of gadoid fishes was presumed to be derived from TMAO.
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