| 郭晓宏,杨智超,吴 迪,陈昆松.溴百里酚蓝/甲基红协同增效的pH响应型智能水凝胶用于水果新鲜度监测[J].保鲜与加工,2026,26(7):1~8 |
| 溴百里酚蓝/甲基红协同增效的pH响应型智能水凝胶用于水果新鲜度监测 |
| Methylred and Thymolblue Synergistic pH-Responsive Smart Hydrogel for Fruit Freshness Monitoring |
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| DOI： |
| 中文关键词: 水凝胶 新鲜度指示 pH 甲基红 溴百里酚蓝 |
| 英文关键词:hydrogel freshness indicator pH methylred thymolblue |
| 基金项目:浙江省“三农九方”科技协作计划项目（2022SNJF020） |
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| 中文摘要: |
| 为解决水果采后保鲜新鲜度实时监测技术滞后的产业难题，将甲基红和溴百里酚蓝双pH指 示剂原位负载于甲基丙烯酰乙基磺基甜菜碱（SBMA）/丙烯酰胺（AM）/甘油（Glyc）三元体系网络，构建 PSA/Glyc@RB智能水凝胶。系统研究了PSA/Glyc@RB水凝胶的化学结构、力学行为、热稳定性及生物 相容性，并探究了PSA/Glyc@RB的颜色变化与苹果贮藏时间的相关性。结果表明，指示剂的引入未破 坏水凝胶主链结构的完整性，反而通过氢键等相互作用显著提升了网络稳定性，溶胀率稳定在 314.2%，热稳定性显著优于 PSA/Glyc 水凝胶（T10wt%由 174.0 ℃提升至 189.5 ℃），且保持低杨氏模量 （23.2 kPa）与良好的生物相容性，可轻柔地贴附于果实表面。PSA/Glyc@RB水凝胶在pH 3.0~11.0范 围内呈现红到绿的连续颜色梯度变化；用于鲜切苹果保鲜时，24 h内即由深绿转为亮红。本研究可实 现新鲜度实时监测，展现出在智能包装领域作为可视化新鲜度指示标签的应用潜力。 |
| 英文摘要: |
| In order to address the lagging problem in real-time monitoring technology for the freshness of post-harvest fruits preservation, a PSA/Glyc@RB smart hydrogel was developed by in-situ loading dual pH indicators (methylred and thymolblue) into a ternary network composed of methacryloxyethyl sulfobetaine (SBMA), acrylamide (AM), and glyc? erol (Glyc). The chemical structure, mechanical behavior, thermal stability and biocompatibility of the PSA/Glyc@RB hydrogel were systematically studied, and the correlation between the color change and apple storage time was also investigated. The results showed that the indicators introduction retained the structural integrity of hydrogel backbone, and significantly improved network stability via hydrogen bonds and other interactions, yielding a stable swelling rate of 314.2%. The thermal stability was significantly improved compared with the PSA/Glyc hydrogel (T10wt% increased from 174.0 ℃ to 189.5 ℃). Besides, a low Young’s modulus (23.2 kPa) and favorable biocompatibility also allowed the gentle adhesion to fruits surface. Additionally, the PSA/Glyc@RB hydrogel displayed a continuous color gradient shift from red to green across the pH values range of 3.0-11.0. When applied for fresh-cut apples preservation, it changed from dark green to bright red within 24 h. This study offers a strategy for achieving a real-time freshness monitoring, and demonstrating potential applications as a visual freshness indicator label in intelligent packaging field. |
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