| A novel sensor of cysteine self-assembled monolayers over gold nanoparticles for the selective determination of epinephrine in presence of sodium dodecyl sulfate. | |
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MedLine Citation:
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PMID: 22531152 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A novel sensor of cysteine self-assembled monolayers over gold nanoparticles modified gold electrode has been constructed for the determination of epinephrine in presence of sodium dodecyl sulfate (Au/Au(nano)-CysSDS). Electrochemical investigation and characterization of the modified electrode are achieved using cyclic voltammetry, linear sweep voltammetry, and scanning electron microscopy. The Au/Au(nano)-CysSDS electrode current signal is remarkably stable via repeated cycles and long term stability, due to the strong Au-S bond, compared to the Au/Au(nano) electrode. The catalytic oxidation peak currents obtained from linear sweep voltammetry (LSV) increased linearly with increasing epinephrine concentrations in the range of 2 to 30 μmol L(-1) and 35 to 200 μmol L(-1) with correlation coefficients of 0.9981 and 0.9999 and a limit of detection of 0.294 nmol L(-1) and 1.49 nmol L(-1), respectively. The results showed that Au/Au(nano)-CysSDS can selectively determine epinephrine in the coexistence of a large amount of uric acid and glucose. In addition, a highly selective and simultaneous determination of tertiary mixture of ascorbic acid, epinephrine, and acetaminophen is explored at this modified electrode. Excellent recovery results were obtained for determination of epinephrine in spiked urine samples at the modified electrode. Au/Au(nano)-CysSDS can be used as a sensor with excellent reproducibility, sensitivity, and long term stability. |
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Authors:
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Nada F Atta; Ahmed Galal; Ekram H El-Ads |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-4-25 |
Journal Detail:
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Title: The Analyst Volume: - ISSN: 1364-5528 ISO Abbreviation: - Publication Date: 2012 Apr |
Date Detail:
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Created Date: 2012-4-25 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372652 Medline TA: Analyst Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Chemistry, Faculty of Science, Cairo University, 12613, Giza, Egypt. nada_fah1@yahoo.com galal@sci.cu.edu.eg. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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