INFLUENCE OF GAMMA IRRADIATION AND LOW TEMPEARTURE STORAGE ON THE QUALITY AND SHELF LIFE OF COBIA FILLETS (RACHYCENTRON CANADUM)
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Date
2021
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KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR
Abstract
The present investigation is aimed to study the influence of gamma irradiation (1, 3 and 5
kGy) and subsequent storage at ice (0 °C) and frozen storage temperature (-20 ± 2 °C) on the
quality and extended shelf life of Cobia (Rachycentron canadum) fillets. The quality changes
and extended shelf life were assessed by evaluating the changes in biochemical, microbial and
sensory attributes during different storage conditions. The result revealed that all the
biochemical quality indices studied like pH, TMA-N, TVBN, TBARS and PV were within the
acceptable limit. Total volatile base nitrogen values for irradiated fish samples were
significantly (p<0.05) lower than the non-irradiated samples throughout the storage period,
and the rate of decrease was more pronounced in samples irradiated at the higher dose
(5 kGy). Thiobarbituric acid reactive substances and peroxide value for irradiated (5 kGy)
samples were significantly (p<0.05) higher than the non-irradiated (control) sample. The total
microbial load (mesophilic, psychrophilic and coliforms) for the non-irradiated fish fillets
samples were higher than the irradiated samples stored at ice (0 oC) and frozen temperature.
No definite trend was observed for pH value of both non-irradiated and irradiated samples.
Sensory evaluation showed a reasonable and good correlation with bacterial populations with
storage time. The result of the investigation revealed that the influence of gamma irradiation
and low temperature storage resulted in overall reduction of microbial loads and stabilized the
biochemical characteristics of fish fillets. Therefore, irradiation at a low dose of 3 kGy could
be used to control the microbial safety and biochemical characteristics of Cobia (Rachycentron
canadum) fillets for up to 36 days at ice temperature (0 oC) and 90 days for frozen storage.