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Light‐Controlled Photochemical Synthesis of Gelatin‐Capped Gold Nanoparticles for Spectral Activity and Electro‐oxidation of Quercetin
Author(s) -
Thirumalraj Balamurugan,
Rajkumar Chellakannu,
Chen ShenMing,
Dhenadhayalan Namasivayam,
Lin KingChuen
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700552
Subject(s) - colloidal gold , gelatin , absorbance , detection limit , chemistry , nanoparticle , chloroauric acid , spectrophotometry , nuclear chemistry , reducing agent , quercetin , ultraviolet visible spectroscopy , materials science , organic chemistry , chromatography , nanotechnology , antioxidant
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.