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Issue 17, 2016
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SERS speciation of the electrochemical oxidation–reduction of riboflavin

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The reduction and oxidation of the flavin system is an important electron transfer reaction in biological systems. Several reaction pathways exist to connect oxidized to fully reduced riboflavin, each with unique intermediates including a semi-quinone radical. By performing surface-enhanced Raman scattering (SERS) with simultaneous electrochemical detection of riboflavin at different pH values, we are able to correlate reversible changes in spectral features to the current changes observed in the cyclic voltammetry. Multivariate curve resolution analysis of the SERS spectra indicates that three distinct components were present at the SERS electrode at each pH during the potential sweep. To verify and better understand the variations in Raman bands across the voltammogram, density functional theory (DFT) calculations were performed to model the effect of pH and oxidation state on the riboflavin Raman spectrum. The calculated spectra show qualitative agreement with the species identified in the chemometric analysis. This combination of results indicates the presence of the oxidized, semi-quinone, and reduced forms of riboflavin and provides insight into the mechanism of the flavin redox system.

Graphical abstract: SERS speciation of the electrochemical oxidation–reduction of riboflavin

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Publication details

The article was received on 06 May 2016, accepted on 08 Jun 2016 and first published on 08 Jun 2016

Article type: Paper
DOI: 10.1039/C6AN01054G
Citation: Analyst, 2016,141, 5078-5087

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    SERS speciation of the electrochemical oxidation–reduction of riboflavin

    M. R. Bailey and Z. D. Schultz, Analyst, 2016, 141, 5078
    DOI: 10.1039/C6AN01054G

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