Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Rapid Communications
SERS Measurements of Magnetic Stretching Force-Induced Trans-Gauche Conformational Change
Takeyoshi GOTOHitoshi WATARAI
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2010 Volume 26 Issue 2 Pages 135-136


The effects of stretching forces on covalently bridged 3-mercaptopropanoic acid molecules between magnetic particles (MPs) and Ag nano-particles (NPs) were studied by surface-enhanced Raman scattering (SERS) spectroscopy. With an exertion of 100 pN per single MP, the intensity ratio of the C-S stretching vibrations for trans-to-gauche conformations was increased from 0.295 ± 0.008 to 0.69 ± 0.09. From the experimental result, it was concluded that the magnetic forces increased the distance between the MP and the Ag NP surface, and induced a shift of the isomerization equilibrium to the trans conformation. The present approach is a new candidate for a dynamic force spectroscopy of conformational equilibria.

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© 2010 by The Japan Society for Analytical Chemistry
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