아세트산으로 처리한 황다랑어 (Thunnus albacores) 껍질 유래 젤라틴 바이오필름의 물리적 및 생체 접착 특성

Abstract

The present study examined the physical properties and the bioadhesive charac-teristics of biofilms manufactured from yellowfin tuna Thunnus albacores skin gelatin with the aim of developing a biofilm from fisheries by-products to replace mammalian sources. The physical properties and bioadhesive strength of biofilms from yellowfin tuna gelatin were compared with those of biofilms from porcine gelatin. The yellowfin tuna gelatin biofilm exhibited higher tensile strength (69.08 MPa) and greater elongation (14.32%) than did porcine gelatin biofilm (50.50 MPa and 10.21%, respectively). The ΔE and YI (yellowness index) Hunter-color values of yellowfin tuna gelatin biofilm were three-fold and 15-fold higher, respectively, than values for porcine gelatin biofilm. The opacity value of yellowfin tuna gelatin biofilm was higher than that of porcine gelatin biofilm. The stability against water of yellowfin tuna gelatin biofilm was lower than that of porcine gelatin biofilm at 2 pH 3 to pH 11. Thermogravimetric analysis (TGA) indicated that the thermal sta-bility of the biofilms was about 270°C for porcine gelatin biofilm and about 250°C for yellowfin tuna gelatin biofilm. The bioadhesive strength of tuna gelatin biofilm was compared to that of porcine gelatin biofilm. The tuna gelatin biofilm exhibited a higher bioadhesive strength than the porcine gelatin biofilm. Gelatin biofilm was subjected to glutaraldehyde treatment at different concentrations, temperatures and pH in order to improve its bioadhesive strength. Glutaraldehyde treatment im-proved the bioadhesive strength of gelatin biofilm up to three-fold. The bioadhe-sive strength of glutaraldehyde treated-biofilm was significantly decreased by ap-plication of sodium borohydride.