An arnperometric system based on a carbon paste electrode modiri ed with Mn02 wasrnin vestigated as a sensor for glucose in flow-injec tion analysis ( FIA). Enzymatic ox idation ofrnglucose and catal yt ic ox idation of the intermcdiate (1-1 20 2) by MnQ is exploited for thernu1l1perollletric monitoring of glucose. at an operating potential of + 0.59 V vs. Ag/Agci.