Microwave-Assisted Synthesis of Unmodified Gold Nanoparticles for Colorimetric Detection of Dopamine

Ekarat Detsri; Kanrayasiri Kamhom; Chatsuda Detsri

doi:10.4028/www.scientific.net/KEM.730.167

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 730Microwave-Assisted Synthesis of Unmodified Gold...

Microwave-Assisted Synthesis of Unmodified Gold Nanoparticles for Colorimetric Detection of Dopamine

Abstract:

Unmodified gold nanoparticles (AuNPs) have been successfully synthesized by the chemical reduction of tetrachloride gold (III) ions ([AuCl₄]^-) in the presence of sodium citrate based on the rapid microwave−assisted approach. The diameter of the synthesized nanoparticles was found in the range of 16.50±2.75 nm. The AuNPs were characterized using UV−vis spectrophotometer, zeta potential analyzer and transmission electron microscope (TEM). The sodium citrate protected AuNPs were found to be selective and sensitive for the detection of dopamine. It was based on the aggregation change of the nanoparticles from random coil to hairpin structure upon the addition of dopamine concentration. The red shift of the plasmonic peak wavelength of AuNPs could be used for the detection of dopamine. The response to dopamine allows for a linear range from 10 to 125 mg⋅L^-1 (R² = 0.9804) with a limit of detection (LOD) at a signal to noise ratio of 3 of 12.85±1.38 mg⋅L^-1. The colorimetric sensor was evaluated with 98.0−99.9% recovery of added dopamine in urine sample. The proposed sensor was successfully applied to the determination of dopamine in biological samples.

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Key Engineering Materials (Volume 730)

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167-171

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https://doi.org/10.4028/www.scientific.net/KEM.730.167

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Online since:

February 2017

Authors:

Ekarat Detsri*, Kanrayasiri Kamhom, Chatsuda Detsri

Keywords:

Colorimetric Sensor, Dopamine, Microwave Irradiation, Nano Materials, Unmodified Gold Nanoparticles

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