Abstract
Investigations were carried out to evaluate the effect of gamma radiation (1.0 and 1.5 kGy) and food-grade preservative (2% potassium sorbate) on the shelf-life of refrigerated (4°C) Spotted snakehead, Channa punctata (Bloch, 1793). Quality assessments were evaluated by sensory (OS), chemical (TV), microbial (TBC and TCC) analyses. Based on control panel, OS was shown to be gradually decreased with the storage time. Irradiated and potassium sorbate treated samples were found acceptable (edible) up to 28 and 21 days, respectively of storage period. TV were lower in irradiated samples with dose of 1.5 kGy compared to other samples. Though microbial load of each of the irradiated samples were within the acceptable limits up to 28 days but 1.5 kGy dose was found more effective. Gamma radiation in combination with good refrigeration could be most effective treatment for the shelf-life extension and microbiological quality improvement for snakehead preservation. Moreover, this preservation technique may be applicable for other fish species to enhance food safety for public health issues.
 Jahangirnagar University J. Biol. Sci. 9(1 & 2): 1-12, 2020 (June & December)
Highlights
Being for tropical climate, Bangladesh is one of the suitable regions for warm water fisheries in the world as it harbors the huge flooded wetlands, like lakes, ponds, rivers, canals, etc., coastal water and mangroves
Samples of first lot were used for biochemical composition analysis to obtain the information on the nutritional qualities, and those of lot 2 were used to evaluate the effect of gamma radiation and food-grade preservative on shelf-life of Taki
Total coliform count (TCC) varied from 4.5×102 to 6.6×105 cfu/g in control, 1.3×102 to 2.5×104 cfu/g in potassium sorbate dipped samples during the entire storage period. Those in irradiated samples of 1.0 kGy ranged from 2.0×101 to 3.0×103 cfu/g and from nil to 1.0×102 cfu/g in irradiated sample of 1.5 kGy (Table 3). These results showed that Total Coliform Count (TCC) gradually increased up to 28 days in control samples but in case of 2% potassium sorbate (60 second dip) and irradiated samples the count were increased for a period of time but slowly in 1.5 kGy than 1.0 kGy and 2% potassium sorbate dipped samples and reduced gradually
Summary
Being for tropical climate, Bangladesh is one of the suitable regions for warm water fisheries in the world as it harbors the huge flooded wetlands, like lakes, ponds, rivers, canals, etc., coastal water and mangroves. Fish are one of the richest sources of nutrients; moisture, protein, lipid, vitamins and minerals are the important constituents of the fish and body parts (Roos et al, 2003; Moghaddam et al, 2007). They contribute about 60% to the nation’s total animal protein as a supplementary source in Bangladesh (DoF, 2018). Previous studies agreed with the high level of post-harvest loss during handling, processing, transportation and storage of fish and fishery products (Alam, 2005, 2006). The low quality fish are a great concern of food security and public health and have a serious negative impact on economy (Alam, 2010)
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