Influence of temperature and extraction time on gel strength and yield of gelatin from alkaline pretreated speckled smoothhound skin (Mustelus mento)

Abstract

The present study determined the parameters of temperature and extraction time to achieve higher yield and gel strength of gelatin from speckled smooth-hound skin (Mustelus mento) by alkaline hydrolysis. It was used the central composite rotational design (CCRD) which indicated us to perform 11 experiments in order to evaluate the variables temperature in the range of 60ºC to 95°C and extraction time in the range of 30 minutes at 240 minutes on the response variables. It was concluded that the higher extraction times it is used, the higher yield percentage will get, and the lower extraction temperature it is used, the higher gel strength will get. It was also determined the parameters (temperature and extraction time) for obtaining higher yield (27% – 28%) and greater gelatin gel strength (130 Bloom – 150 Bloom), which were between 220 and 240 minutes, and temperatures between 60 and 65 ° C.