Department of Fish Processing Technology, Fisheries College and Research Institute, Tamil Nadu Veterinary and Mammalian Sciences University, Tuticorin 628 008, India.
Food Chem. 2012 Dec 15;135(4):2260-7. doi: 10.1016/j.foodchem.2012.07.069. Epub 2012 Jul 20.
Four types of films viz. gelatin, gelatin-MMT, gelatin-chitosan and gelatin-MMT-chitosan prepared from redsnapper and grouper bone gelatin were compared with the mammalian gelatin films, for their mechanical and barrier properties. Grouper gelatin films had higher tensile strength (TS) and Young's modulus (YM), but lower elongation at break (EAB) than redsnapper films. Incorporation of MMT and chitosan improved the TS (p<0.05) of the films. Water solubilities were lower (p<0.05) in films incorporated with chitosan compared to simple gelatin film. Protein solubilities were lower in gelatin-MMT films, irrespective of the type of solvent used. The water vapour transmission rates (WVTR) of fish and mammalian gelatin films were similar, but addition of MMT had reduced WVTR (p<0.05). SEM micrographs depicted smoother surface for gelatin-MMT and gelatin-MMT-chitosan films. Thus, composite fish gelatin films made with MMT and chitosan could be the good natural biodegradable films due to their better mechanical and barrier properties.
四种类型的薄膜，即明胶、明胶-MMT、明胶-壳聚糖和明胶-MMT-壳聚糖，由红鲷鱼和石斑鱼骨明胶制成，与哺乳动物明胶薄膜进行了比较，以评估它们的机械性能和阻隔性能。与红鲷鱼薄膜相比，石斑鱼明胶薄膜具有更高的拉伸强度（TS）和杨氏模量（YM），但断裂伸长率（EAB）较低。加入 MMT 和壳聚糖提高了薄膜的 TS（p<0.05）。与简单的明胶薄膜相比，加入壳聚糖的薄膜的水溶性更低（p<0.05）。无论使用哪种溶剂，明胶-MMT 薄膜中的蛋白质溶解度都较低。鱼和哺乳动物明胶薄膜的水蒸气透过率（WVTR）相似，但加入 MMT 降低了 WVTR（p<0.05）。SEM 显微照片显示，明胶-MMT 和明胶-MMT-壳聚糖薄膜具有更光滑的表面。因此，由于具有更好的机械性能和阻隔性能，用 MMT 和壳聚糖制成的复合鱼明胶薄膜可能是良好的天然可生物降解薄膜。
