A Polydiacetylene-Based Colorimetric Sensor as an Active Use-By Date for Plant-Based Milk Alternatives.,Macromolecular Rapid Communications

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A Polydiacetylene-Based Colorimetric Sensor as an Active Use-By Date for Plant-Based Milk Alternatives.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-05-27 , DOI: 10.1002/marc.202000172
Max Weston ₁ , Rhiannon P Kuchel ₂ , Rona Chandrawati ₁

Affiliation

Existing date marking tools, such as use‐by and sell‐by dates, fail to inform decision‐making throughout food distribution because they do not adapt to storage conditions such as temperature. Polymer‐based sensors can be incorporated into food packaging to provide an indication of food quality in real time, which can greatly reduce waste. This work identifies free fatty acid (FFA) as a marker for the quality of plant‐based milk and demonstrates the first detection tool for the freshness of almond milk using phospholipid‐doped polydiacetylene (PDA) vesicles. The sensor discriminates between triglycerides and FFA by a visible color change and can therefore be used to track fat metabolism during food spoilage. The interaction between FFA and PDA is investigated by electron microscopy and dynamic‐light‐scattering studies. PDA vesicles are then fabricated in agarose and used to discriminate between fresh and spoiled almond milk. Upon exposure of the PDA/agarose sensor to spoiled almond milk, a visible blue‐to‐red color change is induced in the film, which is correlated with FFA concentration in the samples. Incorporation of this technology into food packaging can be used to indicate food quality in real time, surpassing the efficacy of current date marking tools to reduce food waste.

中文翻译：

基于聚二乙炔的比色传感器作为基于植物的牛奶替代品的有效使用日期。

现有的日期标记工具（例如，使用日期和销售日期）无法适应整个食品分配的决策过程，因为它们无法适应温度等存储条件。可以将基于聚合物的传感器集成到食品包装中，以实时显示食品质量，从而可以大大减少浪费。这项工作确定了游离脂肪酸（FFA）作为植物乳品质的标志，并证明了第一个使用磷脂掺杂的聚二乙炔（PDA）囊泡检测杏仁牛奶新鲜度的工具。该传感器通过可见的颜色变化来区分甘油三酸酯和FFA，因此可用于跟踪食物变质期间的脂肪代谢。FFA和PDA之间的相互作用通过电子显微镜和动态光散射研究进行了研究。然后用琼脂糖制造PDA囊泡，并用于区分新鲜杏仁奶和变质杏仁奶。将PDA /琼脂糖传感器暴露于变质的杏仁牛奶后，薄膜中会出现可见的蓝红色变化，这与样品中的FFA浓度相关。将该技术结合到食品包装中可用于实时指示食品质量，超过了当前日期标记工具在减少食品浪费方面的功效。

更新日期：2020-05-27

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