A novel coumarin derivative-modified cellulose fluorescent probe for selective and sensitive detection of CN-in food samples

摘要

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.