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South African Journal of Chemistry

On-line version ISSN 1996-840X
Print version ISSN 0379-4350

Abstract

KHANYILE, Nokuthula; KRAUSE, Rui; VILAKAZI, Sibulelo  and  TORTO, Nelson. Un-functionalized Gold Nanoparticles as a Simple Colorimetric Probe for Sensitive and Selective Detection of Dopamine. S.Afr.j.chem. (Online) [online]. 2019, vol.72, pp.207-214. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2019/v72a27.

A dopamine (DA) colorimetric probe based on the growth and aggregation of un-functionalized gold nanoparticles (AuNPs) is reported. Upon addition of AuNPs to dopamine at various concentrations, the shape, size and colour change of the nanoparticles results in spectral shifts to higher wavelengths and hence colour change is the mode of detection. The colour change can be easily observed by the naked eye from as low as 5.0 nM DA, even under sub-optimal conditions. Under optimal pH conditions the calculated limit of detection was 2.5 nM (3σ). The probe was successfully applied to whole blood sample and showed good selectivity and sensitivity towards DA. The simple, sensitive and selective probe could be an excellent alternative for on-site and immediate detection of DA without the use of instrumentation and would thus be useful for rapid diagnostic applications.

Keywords : Dopamine; gold nanoparticles; colorimetric probe; neurotransmitter; sensor.

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