Effects of chitosan and nano-chitosan as coating materials on the quality properties of largescale tonguesole Cynoglossus arel during superchilling storage

Abstract

The present study examined the effect of chitosan (Ch) and chitosan combined with sodium tripolyphosphate (Nch) nanoparticles as coating materials for Cynoglossus arel fillets during superchilling storage. Treatments included the following: C (untreated, control samples), AC (treated with 1% glacial acetic acid, acid control), Ch (treated with 2% w/v chitosan solution, Chitosan) and Nch (treated with 2% w/v chitosan and 2% sodium tripolyphosphate, Nanochitosan). Nch and Ch coatings significantly were effective on total mesophilic counts (TMC), psychrotrophilic bacteria (PTC) and Enterobacteriaceae. Production of total volatile bases nitrogen (TVBN) and trimethylamine (TMA) for Nch and Ch samples was significantly lower than for control samples during storage. The thiobarbituric acid (TBA) and free fatty acid (FFA) exhibited an increasing trend (p <0.05), whereas the total sulfhydryl (SH) decreased (p <0.05) with increasing storage time. The results indicated that the effect of Nch and Ch on fish samples was to retain their good quality characteristics and extend the shelf life during superchilling storage. The Nch was better than ones Ch in reducing lipid oxidation of fillets and bacterial contamination.<br /> <br /> <br /> <br />