To elucidate the effect of washing, on flesh components, mrigal flesh was washed through one, two and three washing cycles. Washing resulted in absorption of water (1-3%) and loss of fat (49%). 35% loss of soluble protein (SP) was noticed in the first washing itself and the loss is almost equally shared by the sarcoplasmic (18% of SP) and the myofibrillar proteins (17% of SP). The subsequent washings removed small portions of water-soluble sarcoplasmic proteins resulting in the concentration of myofibrillar proteins. 73% of the soluble protein was retained in the flesh after three washing cycles. The protein had undergone marginal conformational changes as reflected by the decrease in the actomyosin Ca super(2+) ATPase activity The rheological properties of the washed flesh were,however, significantly better than that of the unwashed mince
Ramachandran, A; Sankar, T V(Society of Fisheries Technologists (India), 2001)
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Abstract:
Total biochemical composition of freshwater major carps, Labeo rohita -(r9hu); Catla catla
(catla); Cirrltinus tnrigala (mrigal), in relation to size was evaluated . The water soluble
nitrogen fraction constituted about 21% of the tota l nitro gen . Salt so luble fraction
constituted 55 - 60% of the total nitrogen. Non-protein nitrogen represented 12% of the
total nit rogen in all the cases except mri gal of small size (9.36%). The insoluble connec tive
tissu e contributed to 2-3 per cent of tota l nitrogen . The monounsaturated fatty acid s (MUFA)
formed 31-39% of the total fatty acids and 60-68% of the MUFA in freshwat er carps was
CI 8:1. The esse ntial amino acids contributed to 41 to 51% of the total amino acid s in
freshwater major carps. Arom atic amino acid content was sligh tly higher compared to
marine fishe s while the proportion of proline was less. Varia tions in compos ition in rela tion
to size are discu ssed . The autolytic activi ty was significantly higher in small fish in all
the three species