Colorimetric starch film containing anthocyanins is extensively used in eco-friendly intelligent food packaging, but its high water wettability limits its practical application in the food industry. Herein, a super anti-wetting colorimetric starch film was prepared by surface modification with a nano-starch/poly(dimethylsiloxane) (PDMS) composite coating. The water sensitivity, optical properties, mechanical properties, surface morphology, and surface chemical composition of this film were systemically investigated by multiple methods. The obtained film exhibited an extremely high water contact angle (152.46°) and low sliding angle (8.15°) owing to the hierarchical micro-/nanostructure formed by nano-starch aggregates combined with the low-surface-energy PDMS covering. The anti-wettability, optical barrier, and mechanical properties of this film were also significantly improved. The self-cleaning and liquid-food-repelling abilities of this film were comprehensively confirmed. Moreover, this super anti-wetting colorimetric starch film can be applied to monitor the freshness of aquatic products without being disabled by water.

中文翻译：

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用于水产品新鲜度监测的聚二甲基硅氧烷和微/纳米淀粉改性的超抗湿比色淀粉基薄膜

含有花青素的比色淀粉薄膜被广泛应用于环保智能食品包装中，但其较高的水润湿性限制了其在食品行业的实际应用。在此，采用纳米淀粉/聚（二甲基硅氧烷）（PDMS）复合涂层进行表面改性制备了一种超抗湿比色淀粉薄膜。通过多种方法系统地研究了该薄膜的水敏感性、光学性能、机械性能、表面形貌和表面化学成分。由于纳米淀粉聚集体与低表面能PDMS覆盖形成的分级微/纳米结构，所获得的薄膜表现出极高的水接触角（152.46°）和低滑动角（8.15°）。抗湿性、光阻、该薄膜的机械性能也得到了显着改善。该薄膜的自清洁和排斥液体食物的能力得到了综合证实。此外，这种超强抗湿比色淀粉膜可用于监测水产品的新鲜度，而不会被水破坏。