Cyclodextrin-Assisted Surface-Enhanced Photochromic Phenomena of Tungsten(VI) Oxide Nanoparticles for Label-Free Colorimetric Detection of Phenylalanine

Overview

Journal ACS Omega

Publisher American Chemical Society

Specialty Chemistry

Date 2024 May 6

PMID 38708261

Authors

Kenta Adachi

Hiro Azakami

Miyuki Yamauchi

Moeka Koshoji

Asami Yamamoto

Shohei Tanaka

Affiliations

Soon will be listed here.

Abstract

Herein are presented the results of experiments designed to evaluate the effectiveness of host-guest interactions in improving the sensitivity of colorimetric detection based on surface-enhanced photochromic phenomena of tungsten(VI) oxide (WO) nanocolloid particles. The UV-induced photochromic coloration of WO nanocolloid particles in the presence of aromatic α-amino acid (AA), l-phenylalanine (Phe) or l-2-phenylglycine (Phg), and heptakis(2,3,6-tri--methyl)-β-cyclodextrin (TMβCDx) in an aqueous system was investigated using UV-vis absorption spectrometry. The characteristics of the adsorption modes and configurations of AAs on the WO surface have also been identified by using a combination of adsorption isotherm analysis and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). A distinct linear relationship was observed between the concentration of AAs adsorbed on the WO nanocolloid particles and the initial photochromic coloration rate in the corresponding UV-irradiated colloidal WO in aqueous media, indicating that a simple and sensitive quantification of AAs can be achieved from UV-induced WO photochromic coloration without any complicated preprocessing. The proposed colorimetric assay in the Phe/TMβCDx/WO ternary aqueous system had a linear range of 1 × 10 to 1 × 10 mol dm for Phe detection, with a limit of detection of 8.3 × 10 mol dm. The combined results from UV-vis absorption, ATR-FTIR, and adsorption isotherm experiments conclusively indicated that the TMβCDx-complexed Phe molecules in the Phe/TMβCDx/WO ternary aqueous system are preferentially and strongly inner-sphere adsorbed on the WO surface, resulting in a more significant surface-enhanced photochromic phenomenon. The findings in this study provided intriguing insights into the design and development of the "label-free" colorimetric assay system based on the surface-enhanced photochromic phenomenon of the WO nanocolloid probe.

Citing Articles

Label-free colorimetric analysis strategies based on adsorption-responsive surface-enhanced photochromic phenomena of tungsten(VI) oxide nanoparticles for amino acids.

Tanaka S, Adachi K Anal Sci. 2024; 40(9):1695-1708.

PMID: 38836971 DOI: 10.1007/s44211-024-00607-6.

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