The formation of Nafion membranes containing glucose oxidase and dimet
hylferrocene as a mediator was optimized using a previously reported n
on-aqueous enzymology approach for biosensor development. Enzyme immob
ilization in Nafion membranes was carried out from water-organic mixtu
res with a high content of organic solvent. The mediator based reagent
less glucose electrode was tested in a flow injection system. The resp
onse towards glucose addition was stable: the reproducibility during 5
0 assays exceeded 95%. The response was linear over the glucose concen
tration range 0.5-50 mM.