School of Food Science and Pharmaceutics, Zhejiang Ocean University, No. 1 Haida South Road, Lincheng Changzhi Island, Zhoushan, Zhejiang 316000, China; Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Zhenhai, Ningbo, Zhejiang 315201, China.
Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Zhenhai, Ningbo, Zhejiang 315201, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Carbohydr Polym. 2023 Feb 1;301(Pt B):120346. doi: 10.1016/j.carbpol.2022.120346. Epub 2022 Nov 17.
Herein, a novel cellulose-based fluorescent material with amine-responsive property was developed in a CO switchable solvent for the contactless, real-time, and visual monitoring of the freshness of shrimp, crab, and fish. A nucleophilic cellulose carbonate intermediate is in-situ formed upon dissolution of cellulose in the CO switchable solvent, which is adopted for the highly effective grafting of poly(l-lactic acid) and amine-responsive fluorescent reagent 7-amino-4-(trifluoromethyl) coumarin onto the cellulose backbone via ring opening polymerization and nucleophilic substitution reaction, respectively. The product has good processibility, and sensitive and reversible fluorescent responsive towards ammonia. The fluorescent intensity of the material decreased significantly and its fluorescent color changed from blue to cyan, when the aquatic products got spoiled. This study indicates that the CO switchable solvent has great potential for the modification of cellulose with various functionality by taking advantage of the highly active nucleophilic cellulose carbonate intermediate.
本文开发了一种新型基于纤维素的荧光材料，具有胺响应性，可在 CO 开关溶剂中用于接触式、实时、可视化监测虾、蟹和鱼的新鲜度。在 CO 开关溶剂中溶解纤维素时，原位形成亲核纤维素碳酸酯中间体，通过开环聚合和亲核取代反应，分别将聚（L-乳酸）和胺响应性荧光试剂 7-氨基-4-（三氟甲基）香豆素高效接枝到纤维素主链上。该产物具有良好的加工性能，对氨具有敏感和可逆的荧光响应。当水产品变质时，材料的荧光强度显著降低，其荧光颜色从蓝色变为青色。本研究表明，CO 开关溶剂通过利用高活性亲核纤维素碳酸酯中间体，具有对纤维素进行各种功能化改性的巨大潜力。
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