| 光谱学与光谱分析 |
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| The Study of Adsorption of L-aspartic Acid on Silver Sol by Surface-enhanced Raman Scattering |
| ZHU Zhi-liang1，GAO Jun-ying1，LI Feng-ting2，ZHANG Bing-ru2 |
1. Department of Chemistry, Tongji University, Shanghai 200092, China
2. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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Abstract The adsorption state and the characteristics of L-aspartic acid adsorbed on silver sol were studied by the Surface-Enhanced Raman Scattering (SERS) method. Strong Raman signals were detected in the experiments. The results suggested that L-aspartic acid adsorbed on the silver surfaces through carboxyl and nitrogen atoms since the signals were mainly due to the carboxyl and the nitrogen of the molecule of L-aspartic acid. The adsorption of carboxyl on the silver surfaces is chemical adsorption, which is based on the mechanism of charge-transfer, while the adsorption of nitrogen on the silver surfaces is physical type, which is due to the electromagnetic mechanism. The intensity of surface-enhanced Raman scattering of L-aspartic acid adsorbed on silver surface was also analyzed, and it was found that the intensity of surface-enhance Raman scattering will change with different concentrations of L-aspartic acid adsorbed on the silver surfaces. The intensity will reach the top value when the concentration of L-aspartic acid was 10-3 mol·L-1. When the concentration of L-aspartic acid decreased to 10-4 mol·L-1, the intensity of surface-enhanced Raman scattering became a little weaker than that with 10-3 mol·L-1. With further decrease in the concentration of L-aspartic acid, the intensity of surface-enhanced Raman scattering also decreased gradually. When the concentration of L-aspartic acid decreased to 10-6 mol·L-1, the intensity of surface-enhanced Raman scattering was very low. The above study will be helpful to the further study of peptide and other complex biological systems.
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Received: 2002-09-26
Accepted: 2003-03-06
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Corresponding Authors:
ZHU Zhi-liang
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| Cite this article: |
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ZHU Zhi-liang,GAO Jun-ying,LI Feng-ting, et al. The Study of Adsorption of L-aspartic Acid on Silver Sol by Surface-enhanced Raman Scattering [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(01): 68-70.
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| URL: |
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http://www.gpxygpfx.com/EN/Y2004/V24/I01/68 |
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