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. 2025 Jan 15:325:125072.
doi: 10.1016/j.saa.2024.125072. Epub 2024 Aug 31.

Selective colorimetric sensing of histidine in aqueous media via Ag nanotriangles in the presence of HgCl2

Niloofar Namazi Koochak  1 , Davoud Fatmehsari Haghshenas  2 , Sadegh Firoozi  1 , Mohammadreza Hassanzadeh  1
Affiliations

Selective colorimetric sensing of histidine in aqueous media via Ag nanotriangles in the presence of HgCl2

Niloofar Namazi Koochak et al. Spectrochim Acta A Mol Biomol Spectrosc. .

Abstract

Silver nanotriangles (AgNTs) were successfully synthesized as a colorimetric probe for selective and sensitive histidine detection in aqueous media within a 15-100 µM range and a detection limit of 330 nM using UV-Vis spectroscopy. The interaction of HgCl2 with AgNTs would lead to the formation of disk-shaped Ag/Hg amalgam as observed from the transmission electron images and X-ray diffraction patterns. Histidine prevents these structural and morphological changes and accordingly, the detection approach was developed based on the correlation between the histidine concentration and the in-plane dipole plasmon resonance (DPR) intensity.

Keywords: Histidine detection; Silver nanotriangles; Surface plasmon resonance; UV–Vis spectroscopy.

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Conflict of interest statement

Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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