School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, PR China.
School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, PR China.
Food Chem. 2023 Mar 15;404(Pt A):134426. doi: 10.1016/j.foodchem.2022.134426. Epub 2022 Sep 28.
A novel colorimetric film was developed from polyvinyl alcohol/sodium carboxymethyl cellulose (PVA/CMC-Na, CPA) incorporated with anthocyanins (AHO) or betacyanins (BTA) or AHO and BTA mixtures (in the mass ratios of 2:2, 3:1, 1:3) for intelligent packaging. Fourier transform infrared (FTIR) and scanning electron microscope (SEM) illustrated that AHO/BTA were immobilized into CPA network and improved compatibility of PVA and CMC-Na. The incorporation of AHO/BTA increased the tensile strength (TS), elongation at break (EAB), thickness and water solubility (WS) of the sample but decreased the crystallinity and swelling index (SI) of the sample. Furthermore, the colorimetric films presented antioxidant activity besides antibacterial activity against Escherichia coli and Staphylococcus aureus. The colorimetric film incorporated with AHO and BTA at a mass ratio of 3:1 indicated different colors to represent the freshness of pork. The novel colorimetric film possesses great potential in intelligent packaging for monitoring the real-time freshness of pork products.
研制了一种新型比色膜，由聚乙烯醇/羧甲基纤维素钠（PVA/CMC-Na，CPA）掺入花色苷（AHO）或甜菜苷（BTA）或 AHO 和 BTA 混合物（质量比为 2:2、3:1、1:3）制成，用于智能包装。傅里叶变换红外（FTIR）和扫描电子显微镜（SEM）表明，AHO/BTA 被固定在 CPA 网络中，提高了 PVA 和 CMC-Na 的相容性。AHO/BTA 的掺入增加了样品的拉伸强度（TS）、断裂伸长率（EAB）、厚度和水溶性（WS），但降低了样品的结晶度和溶胀指数（SI）。此外，比色膜除了对大肠杆菌和金黄色葡萄球菌具有抗菌活性外，还具有抗氧化活性。掺入质量比为 3:1 的 AHO 和 BTA 的比色膜呈现出不同的颜色，以表示猪肉的新鲜度。新型比色膜在监测猪肉产品实时新鲜度的智能包装方面具有巨大潜力。
