Coupled Resonance Raman, Visible Absorption and Electrochemistry—Applications of a Novel Circulating Cell to Multispectral and Redox Investigations of the Heme Proteins Carboxyhemoglobin and Cytochrome c

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Abstract:

A small volume, self-contained, anaerobic circulating flow cell has been developed and applied to the resonance Raman investigation of two heme proteins: carboxyhemoglobin and cytochrome c. The cell has been demonstrated to be effective in reducing photodissociation of light-sensitive compounds. The flow performance is competitive with several alternative approaches. Electrochemical methods have been coupled with visible absorption and resonance Raman spectroscopy to titrate and determine potentiometrically the formal reduction potential of cytochrome c. Agreement between the results of visible and Raman spectral data demonstrates the feasibility of utilizing quantitative resonance Raman spectroscopy as a probe of formal reduction potentials of enzyme components.

Keywords: Circulating flow cell; Electrochemical titration; Heme proteins; Multispectral; Photodissociation; Resonance Raman; Visible absorption spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370278774331206

Affiliations: Department of Chemistry, North Dakota State University, Fargo, North Dakota 58102 and Department of Chemistry, Princeton University, Princeton, New Jersey 08540

Publication date: July 1, 1978

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