title: Screen-printed amperometric microcell for proline iminopeptidase enzyme activity assay.
abstract: A microfabricated amperometric microcell was designed and used for the determination of proline iminopeptidase (PIP) enzyme activity in 2-10-microl samples. The measurements were made in the range of 10.3-841.5 mU/ml enzyme activities. The sensitivity of the determinations was between - 0.0195 and - 0.0203 microA ml/mU per min. The coefficient of variation of the determined values ranged between 2.8 (at 561.2 mU/ml) and 24.1% (at 10.3 mU/ml). The microcell was manufactured on an alumina substrate using screen-printed graphite working and Ag/AgCl reference electrodes. Elevated PIP activity in the vaginal fluid is a biochemical indicator of bacterial vaginosis. The method is appropriate to differentiate between normal (66+/-145 mU/ml) and elevated, diseased (704+/-145 mU/ml), values.
authors.affiliation: Joint Graduate Program in Biomedical Engineering, The University of Memphis and University of Tennessee Health Science Center, Herff College of Engineering, 38152-6582, USA.
authors.forename: G
authors.initials: G
authors.lastname: Nagy
authors.forename: R E
authors.initials: RE
authors.lastname: Gyurcsányi
authors.forename: C A
authors.initials: CA
authors.lastname: Cristalli
authors.forename: M R
authors.initials: MR
authors.lastname: Neuman
authors.forename: E
authors.initials: E
authors.lastname: Lindner
mesh_terms: D000626:Aminopeptidases / Q000032:analysis*; D015374:Biosensing Techniques; D001826:Body Fluids / Q000201:enzymology; D004563:Electrochemistry; D005260:Female; D006801:Humans; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000175:diagnosis / Q000201:enzymology; D014621:Vagina / Q000201:enzymology; D016585:Vaginosis, Bacterial / Q000150:complications / Q000175:diagnosis / Q000201:enzymology
chemical_list: D000626:Aminopeptidases; C022450:prolyl aminopeptidase