The aim of the present research was to study the gelatin extraction from skin of common carp heads (Cyprinus carpio). The effects of alkaline concentration, pre-treatment time and change of alkaline solution in pre-treatment step of carp heads were evaluated. It was used a complete experimental design with three factors and two variation levels. Pre-treatment time (45-105min), concentration of alkaline solution (3-4mol L-1) and pre-treatment with change of alkaline solution were chosen as independent variable and gelatin yield and gel strength were the response variable. The best condition to obtain gelatin with good yield (1.98%) and gel strength (240.3g) was using alkaline solution 3mol L-1, pre-treatment time of 105min and with one change of NaOH solution.
common carp; fish skins; fish waste; gelatin
