期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 86, 期 -, 页码 527-532出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2011.11.004
关键词
Resonance Rayleigh scattering; Dopamine; Prussian blue nanoparticles
类别
资金
- National Natural Science Foundation of China [20975083]
- Municipal Science Foundation of Chongqing City [CSTC-2008BB4013]
In pH 2.6 HCl solution, dopamine (DA) could reduce Fe(III) to Fe(II), which further reacted with [Fe(CN)(6)](3-) to form a Fe-3[Fe(CN)(6)](2) complex. By virtue of hydrophobic force and Van der Waals force, the complex aggregated to form Fe-3[Fe(CN)(6)](2) nanoparticles with the average diameter of about 20 nm. This resulted in a significant enhancement of resonance Rayleigh scattering (RRS). The maximum wavelength of the ion-association complex was located at about 350 nm. The increment of scattering intensity (Delta I-RRS) was directly proportional to the concentration of DA in the range of 0.06-1.0 mu g/mL. This method has high sensitivity and the detection limit (3 sigma) for DA was 3.43 ng/mL. In this work, the characteristics of absorption and RRS spectra of this reaction have been studied. The optimum reaction condition and influencing factors have been investigated. The method was applied to the determination of DA in pharmaceutical samples with satisfactory results. Furthermore, the reaction mechanism and the reasons of RRS enhancement have been explored. (C) 2011 Elsevier B.V. All rights reserved.
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