No abstract

There is currently considerable interest in definitive characterization of organoperoxy radicals in aqueous media because these radicals seem to play key roles in many chemical (e.g., autoxidation) and biochemical (e.g., lipid peroxidation) reac-

No abstract

The development of an amperometric biosensor for the determination of phenolic compounds is described, using quinoprotein glucose dehydrogenase, The enzyme is integrated into carbon paste and its ability to donate electrons to oxidized phenolic compounds during glucose oxidation is exploited. The sensor response is based on electrochemical oxidation of the phenolic compound followed by its enzymatic regeneration when the bulk solution contains glucose and the electrode is potentiostated at +500 mV (vs. Ag/AgCVO.l m o m KCI). As the result of the catalytic analyte regeneration the electrodes offer very sensitive measurements of redox species like p-aminophenol and hydroquinone and catecholamines such as epinephrine, norepinephrine, and dopamine . The sensor performance is characterized for the different substrates. fighest sensitivity is achieved for paminophenol which could be determined at sub-nanomolar level.