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- Title
Determination of ascorbic acid using an electrode modified with cysteine self-assembled gold-platinum nanoparticles.
- Authors
Lin, Yuanyuan; Hu, Yanling; Long, Yumei; Di, Junwei
- Abstract
We report on a new type of indium tin oxide (ITO) electrode for sensing ascorbic acid (AA). The ITO film was modified with gold-platinum alloy nanoparticles (Au-Pt NPs) functionalized with a self-assembled film of L-cysteine. The Au-Pt NPs were electrodeposited on the ITO film and characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction. A cyclic voltammetric study revealed that the electrode exhibits excellent electrocatalytic activity towards the oxidation of AA. The calibration plot for AA is linear over the concentration range from 2 to 400 μM with a correlation coefficient of 0.9991. The detection limit of AA is 1 μM. [Figure not available: see fulltext.]
- Subjects
VITAMIN C; MOLECULAR self-assembly; ELECTRODES; NANOPARTICLES; GOLD-platinum alloys; METALLIC oxides; ELECTROCHEMICAL sensors; METALLIC films; ELECTROCATALYSIS
- Publication
Microchimica Acta, 2011, Vol 175, Issue 3/4, p259
- ISSN
0026-3672
- Publication type
Article
- DOI
10.1007/s00604-011-0689-x