Song Zhaoyang, Ni Wenjing, Zheng Ya, Ma Yabin, Cao Yinjuan, Han Ling, Yu Qunli
College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, China.
Institute of Storage and Processing of Agricultural Products, Gansu Academy of Agricultural Sciences, Lanzhou, China.
Carbohydr Polym. 2025 Nov 15;368(Pt 2):124221. doi: 10.1016/j.carbpol.2025.124221. Epub 2025 Aug 11.
Recently, smart packaging based on biopolymers and natural anthocyanins as pH-sensitive indicators have played a key role in food safety. However, anthocyanin migration phenomenon and poor stability limit its application in smart packaging. In this study, we constructed a pH sensitive purple potato anthocyanin microcapsules (PAM) using gum arabic and maltodextrin as wall materials. PAM and nanosilver co-filled gellan gum/sodium alginate-based indicator film (GS/Ag-PAM) were prepared for monitoring chilled mutton freshness. Results showed that microencapsulation enhanced the structural stability, antioxidant and antibacterial properties of anthocyanins. The incorporation of PAM and nanosilver enhanced the mechanical properties, barrier properties, thermal stability, and oxidation resistance of the film. The components of the indicator film had good biocompatibility and biosafety. Among them, GS/Ag-PAM 2 showed the highest TS, the lowest OP, and a tight and neat cross-section. When the indicator film was exposed to ammonia, its color gradually changed from purplish red to blue-green and finally to blue. The freshness of chilled mutton reached a state of sub-fresh and spoilage on days 4 and 8, respectively. Correspondingly, the color of the indicator film GS/Ag-PAM changed from purple to grey-green and dark blue. Therefore, GS/Ag-PAM indicator film have good prospects for monitoring the freshness of packaged meat.
最近，基于生物聚合物和天然花青素作为pH敏感指示剂的智能包装在食品安全中发挥了关键作用。然而，花青素迁移现象和稳定性差限制了其在智能包装中的应用。在本研究中，我们以阿拉伯胶和麦芽糊精为壁材构建了pH敏感的紫薯花青素微胶囊（PAM）。制备了PAM和纳米银共填充的结冷胶/海藻酸钠基指示膜（GS/Ag-PAM）用于监测冷却羊肉的新鲜度。结果表明，微胶囊化提高了花青素的结构稳定性、抗氧化和抗菌性能。PAM和纳米银的加入增强了膜的机械性能、阻隔性能、热稳定性和抗氧化性。指示膜的成分具有良好的生物相容性和生物安全性。其中，GS/Ag-PAM 2表现出最高的拉伸强度、最低的透氧率和紧密整齐的横截面。当指示膜暴露于氨气中时，其颜色从紫红色逐渐变为蓝绿色，最终变为蓝色。冷却羊肉的新鲜度分别在第4天和第8天达到次新鲜和变质状态。相应地，指示膜GS/Ag-PAM的颜色从紫色变为灰绿色和深蓝色。因此，GS/Ag-PAM指示膜在监测包装肉类新鲜度方面具有良好的应用前景。
