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Enzymatic method for measuring ethylene glycol with a centrifugal analyzer
1Department of Pathology, University of New Mexico School of Medicine, Albuquerque 87131.
Clinical Chemistry
|October 1, 1991
Summary
A new semiautomated method accurately measures ethylene glycol in plasma using glycerol dehydrogenase. This enzymatic analysis offers precise quantification for clinical diagnostics.
Area of Science:
- Clinical Chemistry
- Enzymology
- Analytical Toxicology
Background:
- Ethylene glycol poisoning is a serious medical emergency.
- Accurate and rapid quantification of ethylene glycol in plasma is crucial for effective treatment.
- Existing analytical methods may have limitations in specificity, speed, or complexity.
Purpose of the Study:
- To develop and validate a semiautomated, enzymatic method for determining ethylene glycol concentrations in human plasma.
- To assess the method's precision, accuracy, detection limit, and potential interferences.
Main Methods:
- Utilized glycerol dehydrogenase (EC 1.1.1.6) from Enterobacter aerogenes for its high specificity to ethylene glycol.
- Employed a centrifugal analyzer for sample processing and absorbance measurement at 340 nm after NAD+ addition.
- Established monthly calibration using a five-point calibration curve.
Main Results:
- Achieved between-day precision (CV) of 2% to 5% with monthly calibration.
- Established a detection limit of 0.3 mmol/L with a CV of 10%.
- Demonstrated no significant interference from common substances like ethanol, methanol, isopropanol, acetone, lactate, or glycerol.
Conclusions:
- The described semiautomated enzymatic method provides a precise and reliable means for quantifying ethylene glycol in plasma.
- This method is suitable for routine clinical laboratory use due to its specificity, efficiency, and minimal interference.
- The assay offers a valuable tool for the diagnosis and management of ethylene glycol toxicity.