College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, PR China.
College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, PR China.
Int J Biol Macromol. 2023 Nov 1;251:126369. doi: 10.1016/j.ijbiomac.2023.126369. Epub 2023 Aug 16.
The pH-response color-changeable films were prepared by adding different contents (1 %, 2 % and 3 %) of hyacinth bean anthocyanins (HBA) into guar gum/polyvinyl alcohol blend matrix. The structural characterization and optical, barrier, mechanical, thermal, antioxidant and color-changeable properties of the films were determined. The films were applied to monitor the freshness of chilled shrimp and pork. Results showed that HBA were pH-dependent color-changeable pigments that endowed the films with purple color. 2 % and 3 % of HBA improved the uniformity and compactness of the films by forming hydrogen bonds with film matrix. The barrier ability of the films against UV-vis light, water vapor and oxygen was significantly elevated by 2 % and 3 % of HBA. The mechanical, thermal and antioxidant properties of the films were improved by HBA. The films containing HBA were much sensitive to pH variation and ammonia vapor, presenting obvious color changes (purple→green→yellow-green). The films containing HBA showed good color stability when stored at 4 °C for 30 days. Moreover, the film containing 2 % HBA showed color changes (purple→green) when the chilled shrimp and pork decayed. The results suggested that the film containing 2 % HBA was suitable to monitor the freshness of meat products in intelligent packaging field.
将不同含量（1%、2%和 3%）的槐蓝豆花色苷（HBA）添加到瓜尔胶/聚乙烯醇共混基质中，制备出 pH 响应型颜色变化薄膜。测定了薄膜的结构特征以及光学、阻隔、力学、热学、抗氧化和颜色变化性能，并将其应用于监测冷藏虾和猪肉的新鲜度。结果表明，HBA 是一种 pH 依赖性变色颜料，使薄膜呈现出紫色。2%和 3%的 HBA 通过与膜基质形成氢键，提高了薄膜的均匀性和致密性。2%和 3%的 HBA 显著提高了薄膜对紫外-可见光、水蒸气和氧气的阻隔能力。HBA 提高了薄膜的力学、热学和抗氧化性能。含 HBA 的薄膜对 pH 值变化和氨蒸气非常敏感，呈现出明显的颜色变化（紫色→绿色→黄绿色）。当在 4°C 下储存 30 天时，含 HBA 的薄膜具有良好的颜色稳定性。此外，当冷藏虾和猪肉腐败时，含 2%HBA 的薄膜显示出颜色变化（紫色→绿色）。结果表明，含 2%HBA 的薄膜适合用于智能包装领域监测肉类产品的新鲜度。
