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Screen-printed amperometric microcell for proline iminopeptidase enzyme activity assay
G Nagy1, R E Gyurcsányi, C A Cristalli
1Joint Graduate Program in Biomedical Engineering, The University of Memphis and University of Tennessee Health Science Center, Herff College of Engineering, 38152-6582, USA.
Biosensors & Bioelectronics
|February 24, 2001
Summary
A novel microcell accurately measures proline iminopeptidase (PIP) enzyme activity, a key indicator for diagnosing bacterial vaginosis. This sensitive method aids in distinguishing between healthy and diseased states using small fluid samples.
Area of Science:
- Biomedical Engineering
- Clinical Chemistry
- Analytical Chemistry
Background:
- Bacterial vaginosis (BV) is a common vaginal infection with significant health implications.
- Elevated proline iminopeptidase (PIP) enzyme activity in vaginal fluid is a recognized biochemical marker for BV.
- Accurate and sensitive methods are needed for PIP activity determination to aid BV diagnosis.
Purpose of the Study:
- To design and validate a microfabricated amperometric microcell for quantifying proline iminopeptidase (PIP) enzyme activity.
- To assess the performance characteristics of the developed microcell for enzyme activity measurements.
- To evaluate the utility of the microcell-based method for differentiating between normal and elevated PIP levels indicative of bacterial vaginosis.
Main Methods:
- Fabrication of a microcell on an alumina substrate using screen-printed graphite and Ag/AgCl electrodes.
- Amperometric determination of PIP enzyme activity in small sample volumes (2-10 microliters).
- Measurement range of 10.3-841.5 mU/ml with sensitivity between -0.0195 and -0.0203 microA ml/mU per min.
Main Results:
- The microcell demonstrated high sensitivity and reliable performance across the tested enzyme activity range.
- Coefficient of variation ranged from 2.8% to 24.1%, indicating good reproducibility.
- The method successfully differentiated between normal (66+/-145 mU/ml) and diseased (704+/-145 mU/ml) PIP activity levels.
Conclusions:
- The developed microfabricated amperometric microcell is a sensitive and effective tool for PIP enzyme activity determination.
- This method provides a reliable approach for the biochemical diagnosis of bacterial vaginosis.
- The microcell's ability to analyze small sample volumes makes it suitable for point-of-care or resource-limited settings.