Preparation and characterization of a novel polyvinyl alcohol/pectin film containing bromocresol green-alizarin mixed indicator label for monitoring mushroom freshness

IF 10.6 1区农林科学 Q1 FOOD SCIENCE & TECHNOLOGY

Food Packaging and Shelf Life Pub Date : 2025-08-05 DOI:10.1016/j.fpsl.2025.101578

Yani Liu , Defang Shi , Xiuzhi Fan , Chaomin Yin , Zhicheng Huang , Junlong Meng , Bing Deng , Ying Liu , Cunkun Chen , Hong Gao

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引用次数: 0

Abstract

Intelligent indicator labels offer significant potential for real-time shelf-life assessment and quality preservation during perishable food logistics. This study developed a novel bromocresol green-alizarin (BGA) indicator-embedded polyvinyl alcohol (PVA)/pectin (P) composite film for visual freshness monitoring of Lentinula edodes (shiitake mushrooms). The performance of the films was evaluated based on parameters including thickness, puncture resistance, opacity, moisture content, water solubility, and water vapor permeability. The optimal PVA/P mass ratio of 3:1 in films was determined through a fuzzy comprehensive evaluation, which effectively balanced mechanical strength, water sensitivity, and optical barrier properties. Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) confirmed that BGA incorporation strengthened intermolecular interactions within the polymer matrix, resulting in superior thermal and color stability. For freshness evaluation, the BGA-3 (the ratio of BG:A=1:3) indicator label displayed distinct color transitions from green (pH 7.0) to yellow-green (pH ≈5.0) and finally to orange (pH ≈4.0), corresponding precisely to the freshness stages of L. edodes. Notably, the total color difference (ΔE) of the BGA-3 label showed significant correlations with the accumulated CO₂ concentration within the package and key mushroom quality parameters, including sensory evaluation, total aerobic plate counts, weight loss, hardness, and respiration intensity. The colorimetric response was directly triggered by CO₂-induced pH changes. This intelligent film provides a convenient, non-destructive method for real-time mushroom quality monitoring, demonstrating high application potential within the fresh produce supply chain.

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新型溴甲酚绿茜素聚乙烯醇/果胶薄膜的制备及表征

智能指示器标签为易腐食品物流过程中的实时保质期评估和质量保存提供了巨大的潜力。本研究开发了一种新型溴甲酚绿茜素（BGA）指示剂-包埋聚乙烯醇(PVA)/果胶(P)复合薄膜，用于香菇视觉新鲜度监测。根据膜的厚度、抗穿刺性、不透明度、含水量、水溶性和透气性等参数对膜的性能进行了评价。通过模糊综合评判，确定了薄膜中PVA/P质量比为3:1的最佳材料，有效地平衡了机械强度、水敏性和光学阻隔性。傅里叶变换红外光谱（FT-IR）、x射线衍射（XRD）和热重分析（TGA）证实，BGA的加入增强了聚合物基体内部的分子间相互作用，从而产生了优异的热稳定性和颜色稳定性。在新鲜度评价方面，BGA-3 （BG:A=1:3）指示牌呈现出从绿色（pH 7.0）到黄绿色（pH≈5.0），最后到橙色（pH≈4.0）的明显颜色转变，与L. edodes的新鲜度阶段相对应。值得注意的是，BGA-3标签的总色差（ΔE）与包装内的累积CO₂浓度和感官评价、总需氧板数、失重、硬度、呼吸强度等关键品质参数呈显著相关。比色响应是由CO₂诱导的pH变化直接触发的。这种智能薄膜为实时监测蘑菇质量提供了一种方便、无损的方法，在生鲜农产品供应链中显示出很高的应用潜力。

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来源期刊

Food Packaging and Shelf Life Agricultural and Biological Sciences-Food Science

CiteScore

14.00

自引率

8.80%

发文量

214

审稿时长

70 days

期刊介绍： Food packaging is crucial for preserving food integrity throughout the distribution chain. It safeguards against contamination by physical, chemical, and biological agents, ensuring the safety and quality of processed foods. The evolution of novel food packaging, including modified atmosphere and active packaging, has extended shelf life, enhancing convenience for consumers. Shelf life, the duration a perishable item remains suitable for sale, use, or consumption, is intricately linked with food packaging, emphasizing its role in maintaining product quality and safety.