title: HRP-based biosensor for monitoring rifampicin.
abstract: Pyrrole was electropolymerized onto a Pt electrode in the presence of LiClO(4) and horseradish peroxidase (HRP). This HRP-based biosensor has been used for the amperometric detection of rifampicin (RIF) in the presence of a constant concentration of H(2)O(2). The C(H(2)O(2)) as well as the applied potential (E(ap)) and the pH of the phosphate buffer have simultaneously been optimized through a central composite design. Under these conditions, repeatability, reproducibility, and stability of the modified electrode have been analyzed. The detection limit for RIF has been calculated taking into account the probability of false-positive (alpha) and -negative (beta), reaching a value of 5.06x10(-6) mol dm(-3). The biosensor was applied to the determination of RIF in pharmaceutical preparations and biological samples.
authors.affiliation: Dpto. de Química, Facultad de Ciencias, Area de Química Analítica, Universidad de Burgos, Plaza Misael Bañuelos, s/n, E-09001, Burgos, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Alonso Lomillo
authors.forename: J M
authors.initials: JM
authors.lastname: Kauffmann
authors.forename: M J
authors.initials: MJ
authors.lastname: Arcos Martinez
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004340:Drug Contamination / Q000517:prevention & control; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods*; D004800:Enzymes, Immobilized / Q000737:chemistry; D006735:Horseradish Peroxidase / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011758:Pyrroles / Q000737:chemistry; D015203:Reproducibility of Results; D012293:Rifampin / Q000032:analysis* / Q000737:chemistry*; D012680:Sensitivity and Specificity; D016482:Urinalysis / Q000295:instrumentation / Q000379:methods
chemical_list: D020099:Coated Materials, Biocompatible; D004800:Enzymes, Immobilized; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; D006735:Horseradish Peroxidase; D012293:Rifampin