Department of Agriculture, Forestry and Bioresources, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea.
Program in Eco-Polymer Science and Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon 22212, South Korea.
Carbohydr Polym. 2021 Feb 15;254:117317. doi: 10.1016/j.carbpol.2020.117317. Epub 2020 Oct 25.
Fish-derived gelatin (FG), a raw material for edible films, has recently been spotlighted as an alternative source of mammalian gelatin. However, its low stability under moisture conditions and weak mechanical properties limit its application. In this study, a water-stable and mechanically robust FG film was prepared using alginate dialdehyde (ADA) as an eco-friendly crosslinking agent. The crosslinking process of FG with ADA was easily recognized by the change in the color of the FG/ADA composite film, and the browning index of the FG/ADA film could be correlated well with the actual crosslinking degree. The mechanical strength and Young's modulus of the FG/ADA composite film increased significantly with an increase in the content of the ADA crosslinker. In the case of FG/ADA10, the tensile strength and Young's modulus increased by 400 and 600 %, respectively, compared to those of FG. Remarkably, the FG-ADA crosslinking process greatly decreased the vulnerability of FG in moisture environments. Consequently, the FG/ADA10 film remained stable for 30 days under wet environment. In addition, the FG-ADA crosslinking process could enhance the antioxidative capacity of the FG/ADA edible film. According to this study, FG/ADA composite films fabricated in an effective manner using polymers derived from aquatic species like gelatin from fish and ADA from algae could have practical applications in the edible film-based packaging industry.
鱼明胶（FG）是一种可食用薄膜的原料，最近作为哺乳动物明胶的替代来源受到关注。然而，其在潮湿条件下的低稳定性和较弱的机械性能限制了其应用。本研究使用海藻酸钠二醛（ADA）作为环保交联剂，制备了一种水分稳定且机械性能强的 FG 薄膜。FG 与 ADA 的交联过程可通过 FG/ADA 复合膜颜色的变化轻松识别，并且 FG/ADA 膜的褐变指数与实际交联程度具有良好的相关性。随着 ADA 交联剂含量的增加，FG/ADA 复合膜的机械强度和杨氏模量显著提高。在 FG/ADA10 的情况下，与 FG 相比，拉伸强度和杨氏模量分别提高了 400%和 600%。值得注意的是，FG-ADA 交联过程大大降低了 FG 在潮湿环境中的脆弱性。因此，FG/ADA10 膜在潮湿环境下可稳定 30 天。此外，FG-ADA 交联过程可增强 FG/ADA 可食用膜的抗氧化能力。根据本研究，以鱼类明胶和藻类 ADA 等水生生物来源的聚合物有效制备的 FG/ADA 复合膜在基于可食用膜的包装行业中可能具有实际应用。
