Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Sodium alginate (SA) was used to functionalize the surfaces of silver nanoparticles (AgNPs) to form SA-AgNPs for sensing dimethoate with a rapid and sensitive visual readout. UV-Vis spectrophotometry, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spec...

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Bibliographic Details
Published in:Biosensors (Basel) 2022-11, Vol.12 (12), p.1086
Main Authors: Zhou, Feng-Zuo, Chang, Yung-Hsiang, Hu, Cho-Chun, Chiu, Tai-Chia
Format: Article
Language:English
Subjects:
Absorption
Alginates
Alginic acid
Chemicals
Chromatography
colorimetric assay
Colorimetry
Colorimetry - methods
Dimethoate
Fourier transforms
Infrared spectrophotometers
Infrared spectroscopy
Mass spectrometry
Metal Nanoparticles - chemistry
Nanoparticles
Pesticides
Photoelectron spectroscopy
Photoelectrons
Quantum dots
Scientific imaging
Selectivity
Sensors
Silver
Silver - chemistry
silver nanoparticles
Sodium
Sodium alginate
Spectrophotometry
Spectroscopy, Fourier Transform Infrared
Transmission electron microscopy
Water analysis
water samples
Water sampling
Zeta potential
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Summary:Sodium alginate (SA) was used to functionalize the surfaces of silver nanoparticles (AgNPs) to form SA-AgNPs for sensing dimethoate with a rapid and sensitive visual readout. UV-Vis spectrophotometry, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and zeta potential measurements were used to characterize SA-AgNPs that were synthesized under the ideal conditions. SA-AgNPs were spherical with an average size of 14.6 nm. The stability of SA-AgNPs was investigated with changes in pH, salinity, and storage time. This colorimetric assay of dimethoate relied on the change in the absorption ratio (A /A ) of SA-AgNPs, resulting in their aggregation caused by dimethoate, leading to a visual change for SA-AgNPs from yellow to pale yellow. As a result, the absorption ratio (A /A ) of SA-AgNPs showed good linearity in the range of 0.05 to 2.0 ppm (R = 0.9986) with a limit of detection (LOD) of 30 ppb. Adding other pesticides did not significantly change the absorption ratio of SA-AgNPs, indicating its high selectivity as a colorimetric assay. The sensor was successfully used to detect dimethoate in actual water samples.
ISSN:2079-6374
2079-6374
DOI:10.3390/bios12121086