Light-Controlled Photochemical Synthesis of Gelatin-Capped Gold Nanoparticles for Spectral Activity and Electro-oxidation of Quercetin
Journal
ChemElectroChem
Journal Volume
4
Journal Issue
11
Pages
2842-2851
Date Issued
2017
Author(s)
Thirumalraj, B.
Rajkumar, C.
Chen, S.-M.
Dhenadhayalan, N.
Lin, K.-C.
Abstract
Abstract Gelatin‐capped gold nanoparticles (GEL‐AuNPs) were prepared through the in situ reduction of tetrachloroauric acid (HAuCl 4 ) in gelatin solution under UV light without external reducing agents. The effect of HAuCl 4 concentration and reaction time intervals were monitored by using UV/Vis spectroscopy. The hydrophilic and biocompatible nature of the GEL‐AuNPs composite was studied in terms of their optical activity and electrocatalytic activity toward quercetin (QR). The optical spectra showed a decrease in the absorbance and enhancement in fluorescence of QR as a function of AuNPs, owing to the interaction between QR and GEL‐AuNPs. The spectral changes of QR may be caused by hydrogen‐bond formation between the amine groups in GEL‐AuNPs and −OH and/or carbonyl groups in QR. In addition, the GEL‐AuNPs exhibited excellent electrocatalytic activity towards QR oxidation. The DPV results displayed a good linear response range over the concentrations of QR (0.02 to 34.5 μM) with a detection limit of 1.9 nM. Moreover, GEL‐AuNPs could be utilized for the determination of QR in onion and apple samples for practical applications with satisfactory recoveries.
Type
journal article