Abstract
ABSTRACT The effect of acid ensiling on the stability of different classes of proteases present in the visceral wastes of a major freshwater carp is presented. The changes in moisture, fat and ash content were not significant (P ≥ 0.05) during the storage period of 4 weeks at ambient temperature of 27 ± 2°C. Fresh visceral waste of the freshwater major carp Labeo rohita had considerable protease activity and buffer extractable proteins (2.7% w/w). There was a significant reduction in buffer extractable proteins (BEP) immediately after acidification (P ≤ 0.05), which later increased in the first two weeks before decreasing further during storage. Marked decreases (P ≤ 0.05) in specific activity (Umg−1 protein) of acidic, neutral and alkaline proteases were observed during storage. The stability of proteases was negatively affected by acid ensiling, even with the use of weak acids like propionic and formic acid.
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