Studies on Putrefaction of Aquatic Products-IX:Supplement on Putrefaction of Shark Muscle.-On Volatile Base developing in Shark Muscle

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We have presumed that the large amounts of volatile base formed in the shark muscle when it is allowed to spoil, are chiefly consisted of ammonia and trimethylamine, developing the former from urea and the latter from trimethylamine oxide which are contained abundantly in the shark muscle. Decomposing of urea to ammonia seems to occur preceding that of trimethylamine oxide to trimethylamine, in contrast with the squid muscle in which trimethylamine oxide is decomposed more rapidly than development of ammonia from perhaps monoamino acids containing in a large amount in squid muscle. These changes presumably be occurred by bacteria, and more complicated amino acids and other substances contained in these muscles, from which the poison is supposed to be formed by bacterial action, will probably be decomposed later in these processes. It may be explained, therefore, that the harmless of spoiled shark and squid muscles will partly be due to the large amounts of easily decomposable substances, namely urea, trimethylamine oxide and lower monoamino acids.
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