Extraction Process Modification to Enhance Properties of Skin Gelatin of Pangas Catfish (Pangasius pangasius)

This study was aimed at studying the effect of preliminary treatment variations on the pangas catfish (Pangasius pangasius) skin gelatin, particularly the gel strength. The preliminary treatment using the whiting solution gave higher gelatin property (P<0.05) than that using alum (Al3(SO4)2) and Calcium Hydroxide (Ca(OH)2). High gelatin (dry basis) was 23.37% and gel strength was 360.18 g. The high viscosity, gelling temperature, and melting temperature were 7.87 (cP), 18.67°C, and 31.67°C, respectively. The gelatin SDS-PAGE with pre-treatment of whiting (CaO) was 136.56 kDa, and the rheological test exhibited higher elastic modulus (G’) and viscous modulus (G”) than that of other treatments and commercial gelatin. SEM micrographs also showed that the catfish gelatin pre-treated with the whiting had thick strand with small voids and dense tissue. As conclusion, the extraction process modification using the whiting could increase the skin gelatin properties of the pangas catfish (Pangasius pangasius), and the fish skin is a prospective source of good gelatin with desired functional properties.