PDF(Pubmed)
Abstract：
Pectin and alginate satisfy multiple functional requirements in the food industry, especially relating to natural packaging formulation. The continuous need for economic and environmental benefits has promoted sourcing and investigating alternative biomaterials, such as cactus pear mucilage from the cladodes of Opuntia spp., as natural packaging alternatives. The structural and mechanical properties of mucilage, pectin and alginate films developed at a 5% (w/w) concentration were modified by treating the films with calcium (Ca) in the calcium chloride (CaCl2) form. Scanning electron microscopy (SEM) showed the 5% (w/w) \'Algerian\' and \'Morado\' films to display considerable microstructure variation compared to the 5% (w/w) pectin and alginate films, with calcium treatment of the films influencing homogeneity and film orientation. Treating the alginate films with a 10% (w/w) stock CaCl2 solution significantly increased (p < 0.05) the alginate films\' tensile strength (TS) and puncture force (PF) values. Consequently, the alginate films reported significantly higher (p < 0.05) film strength (TS and PF) than the pectin + Ca and mucilage + Ca films. The mucilage film\'s elasticity was negatively influenced by CaCl2, while the pectin and alginate films\' elasticity was positively influenced by calcium treatment. These results suggest that the overall decreased calcium sensitivity and poor mechanical strength displayed by \'the Algerian\' and \'Morado\' films would not make them viable replacements for the commercial pectin and alginate films unless alternative applications were found.
摘要：
果胶和藻酸盐满足食品工业中的多功能要求，特别是关于天然包装配方。对经济和环境效益的持续需求促进了替代生物材料的采购和研究，例如仙人掌科的仙人掌梨粘液。,作为天然包装的替代品。粘液的结构和机械性能，通过用氯化钙（CaCl2）形式的钙（Ca）处理薄膜来改性以5％（w/w）浓度显影的果胶和藻酸盐薄膜。扫描电子显微镜（SEM）显示，与5％（w/w）果胶和藻酸盐膜相比，5％（w/w）\'阿尔及利亚\'和\'Morado\'膜显示出相当大的微观结构变化，膜的钙处理影响均匀性和膜取向。用10%(w/w)储备CaCl2溶液处理藻酸盐膜显著增加(p<0.05)藻酸盐膜的拉伸强度(TS)和穿刺力(PF)值。因此,藻酸盐膜报道显著高于(p<0.05)果胶+Ca和粘液+Ca膜的膜强度(TS和PF)。胶浆膜的弹性受CaCl2的负面影响，而果胶和藻酸盐膜的弹性受钙处理的正面影响。这些结果表明，“阿尔及利亚”和“Morado”薄膜显示的总体钙敏感性降低和机械强度差，除非找到其他应用，否则它们不会成为商业果胶和藻酸盐薄膜的可行替代品。
