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Subject: search.filters.subject.Carbaryl

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    Colorimetric test strip cassette readout with a smartphone for on-site and rapid screening test of carbamate pesticides in vegetables
    (2022-10-01)
    Rakkhun, Waraporn
    ;
    Jantra, Jongjit
    ;
    Cheubong, Chehasan
    ;
    Teepoo, Siriwan
    A test strip cassette integrated with a smartphone detector was developed for the colorimetric detection of carbamate pesticides in vegetables. The influence of various experimental conditions was examined for the detection of the optimum analytical performance of the test strip cassette. The test strip cassette detection of carbamate pesticides was carried out by using 140 mM of acetylthiocholine, 13 mM of 5,5′-dithiobis (2-nitrobenzoic acid), temperature at 37 °C and pH of 8.0. The developed test strip cassette platform is rapid within 5 min. Based on the inhibition effect of carbaryl on acetylcholinesterase activity, the inhibition effect of carbaryl was proportional to its concentration ranging from 1 to 50 mg/L with the detection limit of 0.30 mg/L. The limit of quantitative value was determined to be 1.0 mg/L. The spiking carbaryl, the recoveries were within 96–103% and the relative standard deviations were less than 1.56%. The analysis of carbamate pesticides residual in vegetable samples gave the results in good agreement with the most widely used commercial test kit and UPLC-MS/MS method. The developed test strip cassette required only 5 min for an assay. With the simple procedures and tiny size, it showed a great promising for the developed test strip to work on-site for carbamate pesticides detection in vegetables.
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    Molecularly Imprinted Polymers Near Field Communication sensors for pesticide detection
    (2022-01-01)
    Leepheng, Piyawan
    ;
    Phromyothin, Darinee
    ;
    Thanachayanont, Chanchana
    ;
    Inpor, Kroekchai
    ;
    Olarnwanich, Aricha
    For a healthy and convenient daily lifestyle, co-development of pesticide residue detectors to integrate molecularly imprinted polymers (MIPs) modified electrodes and industrial innovative Near Field Communication (NFC) sensor for smartphones interface devices has been established. It targets cypermethrin and carbaryl which are usually detected in fruits and vegetables. Pesticide-MIPs were fabricated on commercial screen-printed electrodes (SPEs) by bulk polymeri-zation of methyl methacrylate (MMA) monomer, ethylene glycol dimethacrylate (EGDMA) cross-linker, azobis(2-methyl-propionitrile (AIBN) initiator with cypermethrin and carbaryl templates in cypermethrin-MIPs/SPE and carbaryl-MIPs/SPE, respectively. The surface morphology of modified electrodes was characterized by field-emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM), which present cavities of a template on the surface of MIPs/SPE. The experiments of NFC pesticide residue detectors were conducted in real vegetable samples, where a selectivity of 32.18 μA/ppb and a detection limit of 5.4 ppb for cypermethrin-MIPs/SPE and a selectivity of 22.15 μA/ppb and a limit of detection of 9.3 ppb for carbaryl-MIPs/SPE have been obtained. The electrodes can be used four times and have more than six months storage duration.
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    Study on detection of carbaryl pesticides by using surface-enhance raman spectroscopy
    (2020-01-01)
    Chakaja, Chaiwat
    ;
    Limwichean, Saksorn
    ;
    Nuntawong, Noppadon
    ;
    Eiamchai, Pitak
    ;
    Kalasung, Sukon
    In this research, the Ag nanorod structure was used as surface enhanced Raman scattering (SERS) chip which provides a sensitive detection signal for trace analysis of carbaryl pesticide. Carbaryl in solid form was measured by using the standard Raman spectroscopy to investigate the spectrum. Carbaryl at various concentrations was prepared in acetonitrile and dropped on the SERS chip for measuring Raman spectrum by a portable Raman spectrometer. The measurement condition including laser power and exposure time were studied to test the performance of SERS chip for carbaryl detection. From the results, the SERS chip useful for enhancing the Raman scattering signal which was increased depending on the laser power and exposure time. Carbaryl can be detected on SERS chip couple with the portable Raman spectrometer with the limit of detection of 10<sup>-5</sup> M.