Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 222, Issue -, Pages 320-324Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.08.089
Keywords
Unmodified silver nanoparticles; Calorimetric assay; Mn2+ ions; Anti-aggregation; L-arginine
Funding
- Foundation of Science and Technology Department of Sichuan Province [2015JY0053]
- Southwest University of Science and Technology [14zx7165, 15xn0077, CX15-011]
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We report a facile, selective, and sensitive colorimetric assay for Mn2+ ions based on the anti-aggregation of unmodified silver nanoparticles (AgNPs). In the absence of Mn2+ ions, the addition of L-arginine to the AgNPs dispersion caused the aggregation of AgNPs via Ag-N covalent interaction, and the color of the solution changed from yellow to colorless. While the presence of Mn2+ ions can prevent the aggregation of AgNPs due to the formation of the complex between Mn2+ ions and L-arginine, accompanying with a distinct color change from colorless to yellow with the increase of Mn2+ ions. Under the optimal experimental conditions, the absorbance at 390 nm was linearly proportional to the Mn2+ ions concentration in the ranges from 0 to 700 nM, and from 5 mu M to 70 mu M, with a detection limit of 20 nM. Also, it was successfully used for the detection of Mn2+ ions in environmental water samples. (C) 2015 Elsevier B.V. All rights reserved.
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