Milagres, B. G.Neto, G. D.Kubota, L. T.Yamanaka, H.2014-05-202014-05-201997-07-30Analytica Chimica Acta. Amsterdam: Elsevier B.V., v. 347, n. 1-2, p. 35-41, 1997.0003-2670http://hdl.handle.net/11449/34613An amperometric biosensor for salicylate detection was developed by immobilizing salicylate hydroxylase via glutaraldehyde onto a polypyrrole film doped with hexacyanoferrate, supported on a glassy carbon electrode surface. The sensor monitors the catechol produced in the enzymatic reaction on the film surface, at an applied potential of 150 mV vs. SCE. A [NADH]/[salicylate] ratio between 2 and 4 gave the best response. The biosensor presented the best performance in a solution with pH=7.4. The response time was about 40 s. A linear range of response was observed for salicylate concentrations between 1.0x10(-5) and 1.0x10(-4) mol l(-1) and the equation adjusted for this curve was I=(-0.04+/-0.01)+(11.4+/-0.2)[salicylate] with a correlation coefficient of 0.999 for n=6. The biosensor retains its activity for at least 10 days despite daily use. The results obtained using the biosensor for salicylate determination, in three different samples of antithermic drugs, presented a good correlation with the standard colorimetric method.35-41engsalicylate biosensorpolypyrrole filmsalicylate hydroxylaseamperometryArtigo10.1016/S0003-2670(97)00105-0WOS:A1997XQ51300006Acesso restrito