Abstract
Electropolymerisation of riboflavin (Rf) was performed in different media in order to optimise the best conditions for the creation of a stable and electroactive polymerised riboflavin (PRf) film. Electropolymerisation was performed using cyclic voltammetry (CV) in solutions with various pH in different potential windows. Different electrode substrates were used for PRf deposition: pyrolytic graphite (PG) and highly oriented pyrolytic graphite (HOPG).The obtained films were characterised spectroscopically, microscopically and electrochemically applying Raman spectroscopy, reflection-absorption infrared spectroscopy (RAIRS), atomic force microscopy (AFM) and electrochemical methods such as cyclic voltammetry (CV), square wave voltammetry (SWV) and electrochemical impedance spectroscopy (EIS) in different media. The best film was obtained when PRf was electropolymerised from 0.1molL−1 PBS, pH 7.0. Raman and RAIRS data have indicated involvement of isoalloxazine ring III in the polymerisation process. The best response of such an electrode was in the same buffer solution. This electrode will be further applied in (bio)sensor construction.
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