Herein, a fluorescence "on-off" system was developed for monitoring carbendazim (CBZ) residues in fruit samples, based on glutathione-gold nanoclusters (GSH-Au NCs) and silver ions (Ag). First, the fluorescence intensity of GSH-Au NCs was greatly enhanced (turn on) with aggregation-induced emission enhancement (AIEE) effect in the presence of Ag, then fluorescence quenching occurred (turn off) with adding CBZ by the chelation between CBZ and Ag. The quenching degree was well linearly dependent on CBZ concentration covering from 0.5 to 20 μM. Moreover, the GSH-Au NCs-Ag system exhibited superior selectivity towards CBZ and was sensitive for the determination of CBZ in apple and orange juices with a low detection limit of 0.12 μM. The recoveries of CBZ spiked in fruit samples ranged from 81.0 % to 111.4% with the relative standard deviations less than 6.6%, demonstrating its great potential for monitoring CBZ residues in fruit samples.
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| http://dx.doi.org/10.1016/j.foodchem.2022.132836 | DOI Listing |
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