Oxidative stability and quality characteristics of whey protein coated rohu (Labeo rohita) fillets

Background: Edible coatings have beneficial effect on quality of fish and act as barrier against moisture transfer and uptake of oxygen. Edible coating made up of biodegradable materials is helpful to control the quality deterioration and enhance the shelf life. Methods: The present study was designed to elucidate the effects of whey based protein using two plasticizers i.e. sorbitol and glycerol on oxidative stability and quality characteristics of Rohu (Labeo rohita). Coating solutions were prepared by incorporating whey (8 % protein; w/w) in distilled water followed addition of sorbitol and glycerol. Dipping method was used to apply coating on fish fillets. The coated fillets were subjected to quality characterictics, pH, color, TBARS, peroxide value, volatile basic nitrogen (TVBN) and sensory evaluation during 40 days of storage. Results: The results showed significant impact on different quality attributes of fish fillets. Highest (TVBN) and TBARS were observed in control samples (T-0) (12.60 +/- 0.25, mg/100 g, 0.820 +/- 0.02 mg MDA/kg) while lowest in T-3 coated samples (8.81 +/- 0.18 mg/100 g., 0.352 +/- 0.01 mg MDA/kg of meat). Moreover, sensorial findings did not showed adverse effects and T3 coated samples were ranked higher by consumers. Conclusion: In conclusion, coating fish with Whey: Glycerol: Sorbitol (1:1:1) in current investigation enhances the storage life and quality of fish fillets.