Author(s): U.D.P. Manjula, S.C.Jayamanne, G.G.N. Thushari

Abstract: The present study was conducted to evaluate the effect of pretreatment on quality of fish glue made from Yellow fin tuna (Thunnus albacares; YFT). Fish glue was prepared by extracting gelatin from fresh and frozen skin of YFT by modified alkaline pretreatment followed by acid pretreatment method. The effect of three different concentrations (0.1, 0.2, and 0.4 %) of NaOH and HCl on physical properties was tested at two different soaking time 18 and 24 h using a 32 factorial design. YFT skin had a crude protein content of 60.95±0.047%. The best open time (197±1.0 min), desirable time to tack (1.83±0.28 min), high bonding power (24.17±7.48 PSI) at 23oC soaking temperature and 90oC extraction temperature, and desirable color (yellowish brown) for YFT fish glue were observed in 0.2% NaOH and HCl treatment with 24 h soaking time. The pH of final glue sample ranged between 3.96 and 5.15. Effect of acid, base concentration and soaking time were significant (p<0.05) on open time and bonding power. The results showed that YFT fish skin can effectively be used for fish glue production using mild acid and alkaline treatments.

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