Key Laboratory of Molecular Metabolism, Bengbu Medical College, Bengbu 233030, China.
Key Laboratory of Molecular Metabolism, Bengbu Medical College, Bengbu 233030, China.
Carbohydr Polym. 2023 Aug 15;314:120882. doi: 10.1016/j.carbpol.2023.120882. Epub 2023 Apr 14.
Food freshness monitoring is vital to ensure food safety. Recently, packaging materials incorporating pH-sensitive films have been employed to monitor the freshness of food products in real time. The film-forming matrix of the pH-sensitive film is essential to maintain the desired physicochemical functions of the packaging. Conventional film-forming matrices, such as polyvinyl alcohol (PVA), have drawbacks of low water resistance, poor mechanical properties, and weak antioxidant ability. In this study, we successfully synthesise PVA/riclin (P/R) biodegradable polymer films to overcome these limitations. The films feature riclin, an agrobacterium-derived exopolysaccharide. The uniformly dispersed riclin conferred outstanding antioxidant activity to the PVA film and significantly improved its tensile strength and barrier properties by forming hydrogen bonds. Purple sweet potato anthocyanin (PSPA) was used as a pH indicator. The intelligent film with added PSPA provided robust surveillance of volatile ammonia and changed its color within 30 s in the pH range of 2-12. This multifunctional colorimetric film also engendered discernible color changes when the quality of shrimp deteriorated, demonstrating its great potential as an intelligent packaging material to monitor food freshness.
食品新鲜度监测对于确保食品安全至关重要。最近，已经采用了结合 pH 敏感膜的包装材料来实时监测食品的新鲜度。pH 敏感膜的成膜基质对于保持包装所需的理化功能至关重要。传统的成膜基质，如聚乙烯醇 (PVA)，存在耐水性低、机械性能差和抗氧化能力弱等缺点。在本研究中，我们成功合成了 PVA/riclin（P/R）可生物降解聚合物薄膜，以克服这些限制。该薄膜的特征在于 riclin，一种农杆菌衍生的胞外多糖。均匀分散的 riclin 通过形成氢键赋予 PVA 薄膜出色的抗氧化活性，并显著提高其拉伸强度和阻隔性能。紫甘薯花色苷（PSPA）被用作 pH 指示剂。添加 PSPA 的智能薄膜对挥发性氨进行了强有力的监测，并在 2-12 的 pH 范围内在 30 秒内改变其颜色。这种多功能比色薄膜在虾类质量下降时也会产生明显的颜色变化，表明其作为监测食品新鲜度的智能包装材料具有很大的潜力。
