基于聚乙烯醇/纤维素纳米晶体与紫甘蓝花色苷的智能 pH 传感膜用于可视化监测虾的新鲜度。
Intelligent pH-sensing film based on polyvinyl alcohol/cellulose nanocrystal with purple cabbage anthocyanins for visually monitoring shrimp freshness.
机构信息
Key Laboratory of Tropical Crop Products Processing of Ministry of Agriculture and Rural Affairs, Agricultural Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang, Guangdong 524001, China.
Key Laboratory of Tropical Crop Products Processing of Ministry of Agriculture and Rural Affairs, Agricultural Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang, Guangdong 524001, China; College of Tropical Crops, Yunnan Agricultural University, Pu'er, Yunnan 665099, China.
出版信息
Int J Biol Macromol. 2022 Oct 1;218:900-908. doi: 10.1016/j.ijbiomac.2022.07.194. Epub 2022 Jul 27.
We aimed to prepare a new pH-sensing film based on the immobilization of purple cabbage anthocyanins (PCA) into Polyvinyl alcohol (PVA) reinforced by cellulose nanocrystals (CNC). FT-IR, XRD and TGA were used to assess the intermolecular interactions and thermo-stability of films. The addition of CNC and PCA resulted in an enhancement in UV-vis barrier, mechanical properties and moisture resistance. Inclusion of PCA imparted intelligent properties to the films. PCA-loaded films displayed strong visually detectable colorimetric responses to pH (2-13) and volatile ammonia. When applied to monitor shrimp freshness at 4 °C, PVA/CNC films containing 0.6 % PCA exhibited conspicuous color fluctuations from purple to gray blue upon deterioration. As a result, PVA/CNC-PCA colorimetric films were considered as intelligent packaging labels with significant mechanical, water vapor barrier properties and pH-sensing qualities for visual quality evaluation of fresh seafood products.
本研究旨在制备一种新型 pH 感应膜，方法是将紫甘蓝花色苷（PCA）固定在由纤维素纳米晶体（CNC）增强的聚乙烯醇（PVA）中。采用傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）和热重分析（TGA）评估了薄膜的分子间相互作用和热稳定性。添加 CNC 和 PCA 提高了薄膜的紫外可见光阻隔性、机械性能和耐湿性。PCA 的加入赋予了薄膜智能特性。负载 PCA 的薄膜对 pH（2-13）和挥发性氨具有强烈的视觉可检测比色响应。当应用于监测 4°C 下虾的新鲜度时，含有 0.6%PCA 的 PVA/CNC 薄膜在变质时会从紫色到蓝灰色发生明显的颜色波动。因此，PVA/CNC-PCA 比色薄膜被认为是智能包装标签，具有显著的机械、水蒸气阻隔性能和 pH 感应特性，可用于新鲜海鲜产品的视觉质量评估。
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