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A novel coumarin derivative-modified cellulose fluorescent probe for selective and sensitive detection of CN- in food
Jiali Kou1, Zhiyuan Meng1, Xiaoyuan Wang1
1Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Light Industry and Food, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China. wang_zhonglong@njfu.edu.cn.
Abstract:
In this work, a novel coumarin derivative-modified cellulose acetate (DCB-CA) was synthesized as a fluorescent probe for highly selective and sensitive determination of CN- in food samples. The DCB-CA was synthesized by using CA as a skeleton, and the coumarin derivative as the fluorophore. The DCB-CA obtained was characterized by different methods including FTIR, SEM, 1H-NMR, TGA and UV-vis spectroscopy. The DCB-CA exhibited a significant "turn-off" fluorescence response to CN-, accompanied by a distinct fluorescence color change from bright yellow to colorless. The detection limit of CN- using DCB-CA was calculated to be 5.8 × 10-7 M, which was much lower than the threshold limit of CN- recommended by the World Health Organization (1.9 × 10-6 M). Because of the favorable solubility and processability of the CA, the DCB-CA was easily processed into different fluorescent materials including fluorescent films and coatings. The fluorescent film obtained was also applied to the selective detection of CN-. Furthermore, the DCB-CA was successfully applied to determine CN- in food samples.
