Abstract Chitin nanofiber decorated with both cationic (NH3+) and anionic (COO−) is fabricated by partial deacetylation and TEMPO-oxidation (TEMPO/NaClO2/NaClO) system. As-prepared zwitterionic chitin nanofiber has particle size around 395 nm and excellent dispersibility. It could synergize with chitosan to immobilize anthocyanin for manufacturing smart ink, which is proved to be mainly stabilized by hydrogen bond. Chitin nanofiber could improve the rheology properties including yield stress and shearing viscosity of the ink, and result in excellent printability with rub resistance and tape fastness being up to 97.8 % and 98.9 % respectively. The screen-printed label (based on smart ink) displays different colors and shows certain color change trend under different pH conditions. Analysis of the volatile basic nitrogen, CIE Lab (Commission International Eclairage color model) and pH demonstrates the effective indicating properties of the label for fish freshness level. The application on fish proves that this screen-printed label could be an easy, green way to determine the meat freshness.

中文翻译：

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几丁质纳米纤维改善智能墨水性能及其作为新鲜度指示剂的应用

摘要 用阳离子 (NH3+) 和阴离子 (COO−) 装饰的几丁质纳米纤维是通过部分脱乙酰和 TEMPO-氧化 (TEMPO/NaClO2/NaClO) 系统制备的。所制备的两性离子几丁质纳米纤维具有约 395 nm 的粒径和优异的分散性。它可以与壳聚糖协同固定花青素，用于制造智能墨水，被证明主要通过氢键稳定。甲壳素纳米纤维可以改善油墨的屈服应力和剪切粘度等流变性能，并产生优异的印刷适性，耐摩擦性和胶带牢度分别高达 97.8% 和 98.9%。丝印标签（基于智能墨水）显示不同的颜色，在不同的pH条件下呈现一定的颜色变化趋势。挥发性碱性氮的分析，CIE Lab（Commission International Eclairage 颜色模型）和 pH 值证明了标签对鱼新鲜度的有效指示特性。在鱼上的应用证明，这种丝网印刷标签可以是一种简单、绿色的方法来确定肉类新鲜度。