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Immobilized enzyme electrode for creatinine determination in serum
V K Nguyen1, C M Wolff, J L Seris
1Laboratoire de Chimie Physique et Electrochimie, Unité associée au CNRS No. 405, Ecole des Hautes Etudes des Industries Chimiques de Strasbourg, France.
Analytical Chemistry
|March 15, 1991
Summary
This study presents a novel immobilized enzyme electrode for rapid blood serum creatinine measurement. The new method offers a fast, simple, and cost-effective way to determine creatinine levels accurately.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Enzyme Technology
Background:
- Creatinine determination is crucial for assessing kidney function.
- Existing methods for creatinine measurement can be time-consuming or expensive.
- There is a need for rapid, point-of-care diagnostic tools for creatinine analysis.
Purpose of the Study:
- To develop and validate an immobilized enzyme electrode for continuous creatinine determination in blood serum.
- To assess the performance characteristics of the developed electrode, including speed, accuracy, and repeatability.
- To compare the novel method with a standard automated analytical system.
Main Methods:
- Co-immobilization of creatinine amidohydrolase, creatine amidinohydrolase, and sarcosine oxidase onto a Clark-type oxygen electrode.
- Enzymatic catalysis of creatinine decomposition, monitored by oxygen consumption.
- Optimization of assay conditions, including pH and temperature.
- Validation against the Technicon AutoAnalyzer SMAC system.
Main Results:
- The assay provides creatinine measurements in under 1 minute.
- The electrode exhibits high repeatability (2.5% RSD) and a low detection limit (3 x 10(-6) mol L-1).
- Excellent correlation (r = 0.9997) was observed when compared to the established Jaffé-based method.
Conclusions:
- The immobilized enzyme electrode provides a rapid, simple, and inexpensive method for serum creatinine determination.
- This technology is suitable for both normal and abnormal creatinine ranges.
- The developed biosensor demonstrates high accuracy and reliability for clinical diagnostics.