Tb^(3+)参比碳点比率荧光传感器检测多菌灵

Tb^(3+) referenced carbon dot ratiometric fluorescent sensor for the detection of carbendazim

利用镧系元素-铽(Tb^(3+))参比CDs,开发具有双发射特性的Tb^(3+)参比碳点(PAN-CDs&DPA-Tb)比率荧光传感器,用于检测食品基质中的多菌灵(MBC)。传感器通过π-π堆积实现PAN-CDs&DPA-Tb识别MBC,并诱导基于内滤效应(IFE)和电子转移(ET)的同步荧光猝灭来实现MBC的比率荧光检测。该传感器的荧光比率在MBC浓度为0~0.091 mmol/L范围内呈线性响应,检测限为3.0 nmol/L。比率传感器的荧光同步响应增强了对MBC的特异性。该传感器在实际应用中具有良好的准确度和精密度,回收率为93.2%~105.1%,相对标准偏差(RSDs)为0.14%~2.4%,是一种高灵敏度的比率荧光纳米传感器,可用于复杂基质中农药残留的检测。

Lanthanide-terbium(Tb^(3+))referenced CDs(PAN-CDs&DPA-Tb)ratiometric fluorescence sensor with dual emissions was developed for the sensitive detection of carbendazim(MBC)in food matrices.The sensor could selectively recognize MBC throughπ-πstacking,inducing synchronous fluorescent quenching of ratiometric fluorescence based on internal filtration effect(IFE)and electron transfer(ET)to achieve sensitive detection of MBC.The fluorescence ratio of the sensor showed a linear response in the concentration range of 0-0.091 mmol/L for MBC with a detection limit of 3.0 nmol/L.The synchronous fluorescence response of the ratiometric sensor enhanced the specificity to MBC and showed significant resistance to interference in complex food matrices.The sensor presented high accuracy and precision in practical applications,with recoveries of 93.2%-105.1%and relative standard deviations(RSDs)of 0.14%-2.4%,demonstrating a highly sensitive ratiometric fluorescent nanosensor for the detection of pesticide residues in complex matrices.