One-step simultaneous quantitative detection of three pesticides based on bimetallic organic framework nanomaterials and aptamers.

ABSTRACT

We have developed a new method of one-step simultaneous detection for three pesticides including acetamiprid, atrazine and carbendazim based on organic framework nanomaterial Cu/UiO-66 and three different fluorescent dyes labeled pesticide aptamers. Cu/UiO-66 can be easily combined with pesticide aptamers through strong coordination, and then aptamers were adsorbed to the surface of Cu/UiO-66, which brings the dyes and Cu/UiO-66 into close proximity. Then, the fluorescence of dyes was quenched by Cu/UiO-66. When the target pesticides appeared, the aptamers reacted with corresponding target pesticides and formed special spatial structure, and then the dyes were far away from the surface of Cu/UiO-66 and the fluorescence of dyes is resumed. Thus, the one-step simultaneous detection for three pesticides can be achieved by synchronous fluorescence analysis. The detection limit of acetamiprid, atrazine and carbendazim were 0.1 nmol/L, 1.6 nmol/L, and 0.3 nmol/L, respectively. This method has a good sensitivity, low detection limit, and high selectivity. We have developed a new method of one-step simultaneous detection for three pesticides including acetamiprid, atrazine and carbendazim based on a multi-color fluorescent probe composed of bimetallic organic framework nanomaterials Cu/UiO-66 and three different fluorescent dyes and phosphate double-labeled aptamers of acetamiprid, atrazine and carbendazim.