Journal
LUMINESCENCE
Volume 24, Issue 6, Pages 367-371Publisher
WILEY
DOI: 10.1002/bio.1119
Keywords
ascorbic acid; silver nanoparticles; fluorescence; Stern-Volmer law; quenching
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Funding
- Kyungpook National University Research Fund
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A sensitive and selective fluorimetric sensor for the assay of ascorbic acid (AA) using silver nanoparticles as emission reagent was investigated. In this study, silver nanoparticles were prepared based on aqueous-gaseous phase reaction of silver nitrate solution and ammonia gas. The nanoparticles were water-soluble, stable and had a narrow emission band. They were used as a fluorescence probe for the assay of ascorbic acid on its quenching effect on the emission of silver nanoparticles. The principal reason for quenching is likely to be a complexation between ascorbic acid and silver nanoparticles. The quenching mechanism was established by Stern-Volmer law. Under the optimum conditions, the quenched fluorescence intensity was linear with the concentration of ascorbic acid in the range of 4.1 x 10(-6) to 1.0 x 10(-4) M (r = 0.9985) with a detection limit of 1.0 x 10(-7) M. The RSD for repeatability of the sensor for the assay of ascorbic acid concentration of 3.0 x 10(-5) and 4.0 x 10(-6) M was found to be 1.5 and 1.3%, respectively. The proposed method was applied to the determination of ascorbic acid in vegetables and vitamin C tablets. Copyright (C) 2009 John Wiley & Sons, Ltd.
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