Electron-transfer raction is known to be one of the key reactions for generating biological functions. Mechanism revelation at molecular level of such kind reactions is to be very helopful for us to understand the esence of life. In fact, surface enhanced Rman scattering (SERS) technique is one of the most powerful tools for the study on metal-electrolytye and metal-vacuum interfaces since 1970s. Moreover, Raman spectroscopic study in enzymology has provided attractive results during last twenty five years. For the study of electron-transfer reaction mechanism of some oxidoreductases and SERS of some other biological macromolecules, an electrochemical in situ Raman spectroscopic technique was established in author's lab and some research works ahve been done onit in the past two years. A brief review of some works is given in this paper.
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