目的 对温变材料石蜡（PCM）的熔融焓变温度进行微调,用于制作常温储运食品包装温度监测指示标签,通过温变材料固、液状态的转化情况判断食品储运环境的温度变化,以间接了解食品（如新鲜果蔬）的品质,并预测货架期。方法 以兼具导热温变性、耐摩擦性、高纤维亲和性的PCM、羧基化纤维素纳米晶须（C-CNC）和花青素为原料,在高于PCM熔融焓变温度的条件下,采用高速匀质法制备PCM/C-CNC/花青素 Pickering 乳液温变材料,待温度降低到温变材料的熔融焓变温度以下,Pickering乳液固化后,使用X射线衍射仪（XRD）对C-CNC在温变材料中的形态进行分析,并利用差示扫描量热仪（DSC）对温变材料的温度敏感性和熔融焓变温度进行分析,最后,将PCM/C-CNC/花青素温变材料置入纸基标签,制作温变指示标签。结果 随着C-CNC固含量的增加,PCM/C-CNC/花青素温变材料的熔融焓变温度逐渐降低,温度敏感性增强,用该温变材料制作不可逆纸基微流控温度变化指示标签,相变温差为±0.5 ℃。结论 可以通过调整C-CNC的固含量,对温变材料的熔融焓变温度进行微调,实现温变材料熔融焓变温度的梯级细化;将该温度变化指示标签用于常温储运食品的外包装,可以实现对储运环境温度在20~50 ℃内的温度监测,以及对储运全过程温度的精准追踪。
Abstract
The work aims to have fine tuning on the melting enthalpy temperature of the temperature-responsive material paraffin (PCM) for manufacturing temperature monitoring and indication labels for food packaging during normal temperature storage and transportation, judge the temperature changes in the food storage and transportation environment through the solid-liquid state transformation of the temperature-responsive material, so as to indirectly understand the quality of food (such as fresh fruits and vegetables) and predict the shelf life. With PCM with thermal conductivity temperature sensitivity, friction resistance and high fiber affinity, carboxylated cellulose nanocrystals (C-CNC) and anthocyanins as raw materials, under the condition of higher than the melting enthalpy temperature of PCM, the PCM/C-CNC/anthocyanin Pickering emulsion temperature-responsive material was prepared by high-speed homogenization. When the temperature dropped below the melting enthalpy temperature of the temperature-responsive material and the Pickering emulsion was solidified, an X-ray diffractometer (XRD) was used to analyze the morphology of C-CNC in the temperature-responsive material, and a differential scanning calorimeter (DSC) was used to analyze the temperature sensitivity and melting enthalpy temperature of the temperature-responsive material. Finally, the PCM/C-CNC/anthocyanin temperature-responsive material was placed into a paper-based label to make a temperature-responsive indication label. With the increase of the solid content of C-CNC, the melting enthalpy temperature of the PCM/C-CNC/anthocyanin temperature-responsive material gradually decreased, and the temperature sensitivity increased. The irreversible paper-based microfluidic temperature change indication label made of this temperature-responsive material had a phase change temperature difference of ±0.5 °C. In conclusion, the melting enthalpy temperature of the temperature-responsive material can be fine-tuned by adjusting the solid content of C-CNC to realize the stepwise refinement of the melting enthalpy temperature of the temperature-responsive material. When the temperature change indication label is used for the outer packaging of food stored and transported at normal temperature, it can realize the temperature monitoring of the storage and transportation environment within the temperature range of 20-50 °C and the accurate tracking of the temperature in the whole storage and transportation process.
关键词
食品储运温度监测 /
石蜡（PCM） /
PCM/C-CNC/花青素温变材料 /
纸基微流控 /
指示标签
Key words
temperature monitoring for food storage and transportation /
paraffin wax (PCM) /
PCM/C-CNC/anthocyanin temperature-responsive materials /
paper-based microfluidics /
indication labels
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基金
广东省基础与应用基础研究基金联合基金项目-青年基金项目（2019A1515110667）; 东莞市社会发展科技重点项目（20221800906442,20231800903982）; 广东省教育厅青年创新人才类项目（2024KQNCX335,2022KQNCX252）; 广东大学生科技创新培育专项资金资助项目（pdjh2023b1019）
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