Developing nonconjugated fluorescent polymer dots based on cellulose materials through a simple and economical method is of high value for sensing or imaging. However, great challenges are still being suffered. Herein, strong blue-green emission water-soluble cellulose polymer dots (CPDs) are synthesized with excellent stability using carboxymethyl cellulose (CMC) and citric acid (CA) as precursors via a mild reaction and facile synthesis process. Near-spherical nanoparticles with an average size of approximately 11.3 nm and quantum yield of 11.5% are obtained. Importantly, CPDs can be utilized as an excellent fluorescent probe for the detection of tetracyclines (TCs) in aqueous solutions through fluorescence quenching via the inner filter effect. The detection limit for fluorescent CPDs for TC detection is found to be as low as 4.1 × 10^-9 m, and two good linear relationships for TC concentration ranging from 51.8 × 10^-9 to 256.8 × 10^-9 m (R² = 0.996) and 0 × 10^-6 to 15.3 × 10^-6 m (R² = 0.997) are obtained. Finally, the fluorescent CPD fluorescent probe is successfully utilized to detect TC in real samples, including tap water, milk, and river water.

中文翻译：

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制备羧甲基纤维素衍生聚合物点的简便策略及其在检测四环素中的应用

通过简单经济的方法开发基于纤维素材料的非共轭荧光聚合物点对于传感或成像具有很高的价值。但是，仍然面临着巨大的挑战。在此，以羧甲基纤维素 (CMC) 和柠檬酸 (CA) 作为前体，通过温和的反应和简便的合成过程合成了具有优异稳定性的强蓝绿色发射水溶性纤维素聚合物点 (CPD)。获得了平均尺寸约为 11.3 nm 和量子产率为 11.5% 的近球形纳米粒子。重要的是，CPDs 可以作为一种优良的荧光探针，通过内部过滤效应的荧光猝灭来检测水溶液中的四环素 (TCs)。发现用于 TC 检测的荧光 CPD 的检测限低至 4.1 × 10^-9 m，以及从 51.8 × 10 ^-9到 256.8 × 10 ^-9 m ( R ² = 0.996) 和 0 × 10 ^-6到 15.3 × 10 ^-6 m ( R ² = 0.997 ) 的两个良好的线性关系) 获得。最后，荧光CPD荧光探针成功地用于检测真实样品中的TC，包括自来水、牛奶和河水。