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- Title
A Dihydropyridine Derivative as a Highly Selective Fluorometric Probe for Quantification of Au 3+ Residue in Gold Nanoparticle Solution.
- Authors
Paisuwan, Waroton; Sukwattanasinitt, Mongkol; Tobisu, Mamoru; Ajavakom, Anawat
- Abstract
Novel dihydroquinoline derivatives (DHP and DHP-OH) were synthesized in one pot via a tandem trimerization-cyclization of methylpropiolate. DHP and DHP-OH possess strong blue fluorescence with high quantum efficiencies over 0.70 in aqueous media. DHP-OH displays a remarkable fluorescence quenching selectively to the presence of Au3+ through the oxidation of dihydropyridine to pyridinium ion as confirmed by NMR and HRMS. DHP-OH was used to demonstrate the quantitative analysis of Au3+ in water samples with the limit of detection of 33 ppb and excellent recovery (>95%). This fluorescent probe was also applied for the determination of Au3+ residue in the gold nanoparticle solution and a paper-based sensing strip for the on-site detection of Au3+.
- Subjects
GOLD nanoparticles; DIHYDROPYRIDINE; FLUORESCENCE quenching; QUANTUM efficiency; FLUORESCENT probes; INTRAMOLECULAR proton transfer reactions
- Publication
Sensors (14248220), 2023, Vol 23, Issue 1, p436
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s23010436