A review on colorimetric methods for determination of organophosphate pesticides using gold and silver nanoparticles

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This review (with 99 refs.) summarizes the progress that has been made in colorimetric (i.e. spectrophotometric) determination of organophosphate pesticides (OPPs) using gold and silver nanoparticles (NPs). Following an introduction into the field, a first large section covers the types and functions of organophosphate pesticides. Methods for colorimetric (spectrophotometric) measurements including RGB techniques are discussed next. A further section covers the characteristic features of gold and silver-based NPs. Syntheses and modifications of metal NPs are covered in section 5. This is followed by overviews on enzyme inhibition-based assays, aptamer-based assays and chemical (non-enzymatic) assays, and a discussion of specific features of colorimetric assays. Several Tables are presented that give an overview on the wealth of methods and materials. A concluding section addresses current challenges and discusses potential future trends and opportunities.

Schematic representation of organophosphate pesticide determinations based on aggregation of nanoparticles (particular silver or gold nanoparticles). This leads to a color change which can be determined visually and monitored by a red shift in the absorption spectrum.

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The authors would like to highly acknowledge financial support (UPNM/2018/CHEMDEF/ST/2) from Ministry of Education Malaysia. The authors also gratefully acknowledge Universiti Pertahanan Nasional Malaysia (National Defence University of Malaysia).

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Che Sulaiman, I.S., Chieng, B.W., Osman, M.J. et al. A review on colorimetric methods for determination of organophosphate pesticides using gold and silver nanoparticles. Microchim Acta 187, 131 (2020).

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  • Aggregation
  • Deaggregation
  • Assay
  • Silver nanoparticles
  • Gold nanoparticles