An efficacious fabrication of Tara gum reduced/stabilized gold nanoparticles and its post functionalization with quercetin for sensitive and selective optical detection of iodide ion
Year: 2025
Type: article
Abstract: Herein, we reported Tara gum (TG), mediated synthesis of stable and dispersed gold nanoparticles (AuNPs). TG was applied for the first time as the reducing/capping agent for AuNPs synthesis, through heating with gold salt, stirring at 80 °C for 1 h under NaOH support. Reddish color AuNPs solution, exhibiting absorption maximum at 521 nm, with an average particle size of 10.5 ± 1.8 nm, was obtained. The synthesized TG-AuNPs was characterized using various equipment, including TEM, FESEM, ATR-FTIR, Raman spectroscopy, XRD, TGA/DTG, DLS/zeta potential and XPS, which confirmed the dispersal of small-sized AuNPs in TG polymeric structure. TG-AuNPs was further modified with Quercetin (QT), a notable polyphenolic compound, to realize TG-AuNPs-QT nanoparticles which was applied as optical nanoprobe for Iodide ion (I − ) detection. The addition of silver ion [Ag + ], to the TG-AuNPs-QT probe results in color change, from red to yellow, followed with an absorption spectra blue shift from 521 nm to 420 nm, owing to QT mediated in-situ reduction of Ag + to its nanoparticles, which was deposited on pre-formed AuNPs, yielding Au@Ag nanostructure. However, when I − (various concentrations), were pre-mixed with an optimized Ag + concentration, reverse color and absorption spectra perturbations were observed, which is attributed to the high binding interaction between Ag + and I − , forming AgI complex in solution. At the optimal I − detection conditions, the analytical response applied, (A o -A i )@405 nm, was linear with I- concentrations from 1.0 to 65.0 μM, with a limit of detection/quantification (LOD/LOQ) of 250 nM and 0.82 μM, respectively. Practical applications of the probe was demonstrated on water and diverse food samples, with satisfactory accuracy. • Tara gum derived gold nanoparticles was synthesized. • Quercetin was functionalized on Tara gum gold nanoparticles. • Synthesized TG-AuNPs-QT was applied as optical probe for Iodide ion (I-) detection. • The high binding interaction between Ag + and I- was exploited for detection mechanism. • Practical application of TG-AuNPs-QT was applied in Tap water and diverse food samples.
Source: Food Chemistry X
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,330
Funder: Chulalongkorn University
OpenAlex ID: W4414806318