Li Cuihuan, He Yuan, Zhang Jiankang, Mu Jiahui, Wang Junya, Cao Mengyao, Nawaz Haq, Chen Sheng, Xu Feng
State Key Laboratory of Efficient Production of Forest Resources, Beijing Forestry University, Beijing 100083, China; Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
State Key Laboratory of Efficient Production of Forest Resources, Beijing Forestry University, Beijing 100083, China.
Carbohydr Polym. 2024 Dec 1;345:122548. doi: 10.1016/j.carbpol.2024.122548. Epub 2024 Jul 27.
Many amines with high toxicity always cause a serious threat to the ecological environment and human health; thus, their detection is important. Herein, a dual-mode colorimetric and ratiometric fluorescent sensor based on cellulose for detecting amines has been constructed by a new strategy. This sensor is made of a "negative response" indicator (Lum-MDI-CA) and a "positive response" indicator (perylene tetracarboxylic acid, PTCA). Lum-MDI-CA was obtained by attaching luminol onto cellulose chains, which emitted blue fluorescence and was quenched upon contact with amines. A possible mechanism of fluorescence quenching phenomenon is proposed by the intramolecular charge transfer (ICT) of Lum-MDI-CA. Subsequently, by simply mixing Lum-MDI-CA with PTCA, a dual-mode fluorescence sensor was designed for visual detection and classification of amines. When adding ammonia (NH), morpholine (MOR), benzylamine (BNZ), diethylamine (DEA), and triethylamine (TEA), respectively, the dual-mode sensor showed visible different color changes under both UV light and daylight. In addition, owing to the excellent processibility and formability of cellulose acetate backbone, the prepared sensor can be easily processed into different material forms, including inks, coatings, films, and fibers, which still exhibit excellent fluorescence emission. Such sensors based on cellulose fluorescent materials are of great value in anti-counterfeiting and information encryption.
许多高毒性胺类物质总是对生态环境和人类健康构成严重威胁；因此，对它们的检测至关重要。在此，通过一种新策略构建了一种基于纤维素的用于检测胺类的双模式比色和比率荧光传感器。该传感器由一个“负响应”指示剂（Lum-MDI-CA）和一个“正响应”指示剂（苝四羧酸，PTCA）制成。Lum-MDI-CA是通过将鲁米诺连接到纤维素链上获得的，其发出蓝色荧光并在与胺类接触时猝灭。通过Lum-MDI-CA的分子内电荷转移（ICT）提出了荧光猝灭现象的一种可能机制。随后，通过简单地将Lum-MDI-CA与PTCA混合，设计了一种用于胺类视觉检测和分类的双模式荧光传感器。当分别加入氨（NH）、吗啉（MOR）、苄胺（BNZ）、二乙胺（DEA）和三乙胺（TEA）时，该双模式传感器在紫外光和日光下均呈现出明显不同的颜色变化。此外，由于醋酸纤维素主链具有优异的可加工性和可成型性，所制备的传感器可以很容易地加工成不同的材料形式，包括油墨、涂料、薄膜和纤维，它们仍表现出优异的荧光发射。这种基于纤维素荧光材料的传感器在防伪和信息加密方面具有重要价值。
