A preliminary study of the distribution of non-protein nitrogen in some marine fishes and invertebrates

Velankar, N K and Govindan, T K (1958) A preliminary study of the distribution of non-protein nitrogen in some marine fishes and invertebrates. Proceedings of the Indian Academy of Sciences, 47 (4). pp. 202-209.

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Abstract

The non-protein nitrogen of fish muscle constitutes' a small fraction of the total nitrogen content of the fish. However, the nitrogenous extractives of fish muscle which consist of ammonia and trimethylammonium bases, guanidine and imidazole derivatives, and miscellaneous substances such as urea, amino acids, purines and pyrimidines are of signifkance from the aspect of preservation and processing of fish. These substances probably influence the potential keeping quality and appear to contribute to the flavour of the fish. The nature and concentration of their decomposition products are of primary importance in deciding the edibility of the fish. The changes in the concentration of some of these constituents reflect the early changes occurring in fish muscle prior to the onset of organo leptically detectable spoilage and hence are of value as tests for the quality' of fish.

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