FT Vol.53(2)

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Browsing FT Vol.53(2) by Author "Joshy, C.G."

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    Effect of Chitosan on Biochemical, Microbiological and Sensory Characteristics of Restructured Products from Pangasius(Pangasianodon hypoththalumus)
    (Society of Fisheries Technologists(India), 2016) Jeyakumari, A.; Ayoob, K.S.; Ninan, G.; Zynudheen, A.A.; Joshy, C.G.; Lalitha, K.V.
    In India, pangasius (Pangasianodon hypophthalmus) farming is gaining importance among the farmers due to its fast growth and better survival rate. In the present study, restructured products were prepared from pangasius mince in four different formulations by using pangasius fish mince, corn starch (4%) and chitosan (0.75%). Formulation containing only corn starch (4%) served as control. Shelf life of the products was evaluated under chilled (2ÂșC) condition up to 17 days. Biochemical quality parameters viz., total volatile base nitrogen (TVB-N), free fatty acid (FFA) and peroxide value (PV), thiobarbituric acid (TBA) value were within acceptable limits in chitosan treated samples. Control sample was acceptable only upto 6 days compare to 12 days in chitosan treated samples.
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    Optimization of process parameters for the production of chitin from the shell ofFlowertail Shrimp(Metapenaeus dobsoni)
    (Society of Fisheries Technologists(India), 2016) Joshy, C.G.; Zynudheen, A.A.; Ninan, G.; Ronda, V.; Muhammed, S.
    The objective of present study was to optimize the process parameters for the production of chitin from the shell of Metapenaeus dobsoni by deproteinization and demineralization using linear regression. The response variables viz: yield and quality of chitin were optimized in terms of concentration, treatment time and ratio of acid and alkali used in the production of chitin. First order polynomial regression model with interaction coefficients for alkali concentration with treatment time was found as optimal to explain the variability in the response variables in terms of process variables. Based on the fitted model, the coefficients of acid concentration (2.48), acid ratio (0.006) and acid treatment time (0.039) were found significant for chitin yield at 1% level and linear regression coefficients showed a non-significant increasing trend. The regression coefficient for interaction between acid concentration and treatment time showed a significant decreasing trend (-0.025). The optimum combination of process variables to improve the yield and quality of chitin from M. dobsoni shell was sodium hydroxide concentration at 3 % in 1:2 ratio and treatment time of 30 minutes and hydrochloric acid concentration at 1.25 N in1:2 ratio and treatment time of 90 minutes.