Abstract
Mediterranean sea bass (Dicentrarchus labrax L.) fish were gamma irradiated at doses 0, 0.5, 1, 2 or 3 kGy and stored at 1°C for 21 days in the dark to assess whether the delay of fish alteration by irradiation involved the protection of membrane lipids. Total basic volatile nitrogen (TVB-N) and the trimethylamine (TMA) contents, the pH, and the lipid composition of membrane were determined in the muscle tissue during storage. The TVB-N and TMA contents and the pH of irradiated and non-irradiated samples increased during storage whereas the external quality decreased in correlation with a reduction in the amount of phospholipids (PL). The degree of unsaturation of PL and of free fatty acids (FFA) fractions decreased, whereas, the ratio of sterol to PL increased. The catabolism of PL was delayed by irradiation during storage as compared to the untreated sample and it was always positively correlated with the total viable counts (TVC) of fish muscle which was also reduced by the treatments. We conclude that the delay of alteration of sea bass tissue during storage by irradiation involved probably a protection of membrane lipids from degradation which seemed to be partially reliable to the micro-organisms load of muscle tissue.
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