HIGHLY-SENSITIVE MEASUREMENT OF DIHYDROXYPHENOLS USING CARBON FELT ELECTRODE IMPREGNATED WITH FRUCTOSE DEHYDROGENASE-CONTAINING SOLUTION

A carbon felt electrode impregnated with a fructose dehydrogenase/fruc tose-containing solution was used for measuring dihydroxyphenols (eg, catechol and dopamine). Dihydroxyphenol molecules are oxidized on the electrode but regenerated by the enzyme reaction. The consumption/rege neration cycle for dihydroxyphenols resulted in an amplified electrode response. Further, the measuring method could be free from the electr ochemical interference by oxidizable species such as L-ascorbic acid.