In order to prevent and control the effects of pesticide residues on human health and the ecological environment, the rapid, highly sensitive, and selective detection of multiple pesticide residues has become an urgent problem to be solved. Herein, a lab-on-a-molecule probe based on a host−guest complex (ThT@Q[8] probe) has been developed to simultaneously analyze multiple aromatic pesticides under single wavelength excitation, such as fuberidazole, thiabendazole, carbendazim, thidiazuron, and tricyclazole. The fluorescence titration spectra of the ThT@Q[8] probe with the five pesticides mentioned above showed that the fluorescence intensity exhibited a good linear correlation with the pesticide concentration and the limit of detection was as low as 10 −7 M. Because the ThT@Q[8] probe exhibits diverse fluorescence color changes to the five pesticides studied under a 365 nm ultraviolet lamp, we fabricated a single probe used to detect multiple analytes in the RGB triple channel by extracting the RGB variations. Principal component analysis and linear discriminant analysis proved that the ThT@Q[8] probe can recognize and distinguish five pesticides and can be applied at different concentrations. In real samples, the ThT@Q[8] probe recognized and distinguished five pesticides in tap water and Huaxi River water. The 1 H NMR spectra results proved that a charge-transfer complex of ThT and pesticides in the Q[8] cavity may be formed. Moreover, we selected a test strip as a carrier to detect pesticides. The results indicate it can be used to quickly and conveniently detect different pesticides due to the rapid color change. Besides, the ThT@Q[8] probe has good cell permeability and can be used to detect pesticide residues in living cells. This work has laid the foundation for the qualitative and quantitative multitarget detection of pesticide residues.
The simultaneous detection of multiple
quaternary ammonium
pesticides
(QAPs) in water is a challenge due to their high solubility in water
and similar structures. In this paper, we have developed a quadruple-channel
supramolecular fluorescence sensor array for the simultaneous analysis
of five QAPs, including paraquat (PQ), diquat (DQ), difenzoquat (DFQ),
mepiquat (MQ), and chlormequat (CQ). Not only were QAP samples of
different concentrations (10, 50, and 300 μM) in water distinguished
with 100% accuracy but also single QAP and binary QAP mixed samples
(DFQ-DQ) were sensitively quantified. Our experimental interference
study confirmed that the developed array has good anti-interference
ability. The array can quickly identify five QAPs in river and tap
water samples. In addition, it also qualitatively detected QAP residues
in Chinese cabbage and wheat seedlings extract. This array has rich
output signals, low cost, easy preparation, and simple technology,
demonstrating great potential in environmental analysis.
A “turn-off”
supramolecular fluorescence array sensor
based on the host–guest complexes between fluorescence dyes
and cucurbit[n]urils for sensing metal ions was developed.
Three fluorescent probes (RhB@Q[7], H33342@2Q[7], and BRE@Q[7]) were
used as the sensing units to construct a supramolecular fluorescence
array sensor. The binding ability of the metal ions and cucurbituril-dye
probes varied; therefore, the probes and metal ions produced different
fluorescence responses. When combined with linear discriminant analysis
(LDA), the qualitative and quantitative detection of seven metal ions
was achieved. In analytical samples, the supramolecular fluorescence
array sensor recognized and distinguish seven metal ions. These results
provided new research ideas for the rapid analysis and real-time monitoring
of different heavy metal ions.
A supramolecular fluorescence array sensor based on the cucurbituril-dye host-guest complex (6-QAA@Q[7], PyY@Q[7], and TO@Q[8]) was constructed. The results showed that it can quickly identify and detect toxic heavy metal...
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