Effect of Season and Chilled Storage On Biochemical Composition of Tunisian Caramote Shrimp Head and Common Cuttlefish Viscera

摘要

Seasonal changes of biochemical composition of caramote shrimp head (CSH) and common cuttlefish viscera (CCV) were investigated. The effect of chilled storage (5°C) of these by-products during 21 days on the physicochemical quality indicators was evaluated for every season to assess a suitable storage period. All biochemical components varied significantly (P0.05) overall season for both types of by-products except moisture and chitin contents, which remained constant in CSH (79.77±0.33% and 8.33±1.11% respectively). CCV and CSH by-products were a main source of proteins (28.37±5.44% and 20.37±5.77% respectively on dry weight basis (d.w.b)) and ash (23.60±4.18% and 28.28±2.32% respectively d.w.b). Principal component analyses (PCA) proved that CSH could be upgraded to obtain a rich product in minerals and chitin components at any time regardless the season. CCV collected in spring and summer could be assimilated as a homogenous group rich in protein and lipid. The chilled storage CCV and CSH during 21 days showed significant (P0.05) variations of some physicochemical indicators and according to PCA, by-products might be stored just for few days (not more than a week) as proteolysis and lipolysis increased from the first week.