Abstract
The changes in adenine and inosine nucleotides during rigor have been studied by the conventional chemical methods and by the methods of elution and paper chromatography. The pattern in pre-rigor muscle consists of small amounts of DPN, TPN and ADP and a large amount of ATP, whereas during and after rigor it changes to one of DPN, TPN, inosine, hypoxanthine, IDP, ITP, ADP, ATP and IMP, of which the latter is vastly predominant. The accompanying liberation of ammonia is greater than the expected destruction of labile-P, considerable quantities of which survive into the post-rigor period. Most of this surviving labile-P is of non-nucleotide origin. It is also shown that rigor occurs at room temperature over a very narrow range of ATP concentrations.
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