Gelatin from yellowfin tuna (Thunnus albacares) dorsal skin was optimized for adhesive strength to plywood using surface response methodology of a central composite design with a dependent variable of adhesive strength (Y, kg f /cm 2 ) and two independent variables of gelatin concentration (X 1 , %) and hardening time (X 2 , hrs). From the above design, a maximum adhesive strength of 49.84 kg f /cm 2 was obtained under the optimal treatment condition of 15.85% gelatin concentration and 25.68 hr hardening time. The adhesive strength under optimum conditions was 50.93 kg f /cm 2 . The adhesive strength of the tuna gelatin was shown to be superior to that of bovine and porcine gelatins which had adhesive strengths of 34.75 and 34.9 kg f /cm 2 , respectively.
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