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Simple sensitive solid-phase extraction of paraquat from plasma using cyanopropyl columns
N B Smith1, S Mathialagan, K E Brooks
1Department of Clinical Biochemistry, University Hospital, London, ON, Canada.
Journal of Analytical Toxicology
|May 1, 1993
Summary
This study presents a simple, inexpensive, and sensitive method for quantifying paraquat in plasma. The new assay is reliable for clinical toxicology, with a low limit of quantification and good precision.
Area of Science:
- Clinical Chemistry
- Analytical Chemistry
- Toxicology
Background:
- Paraquat poisoning is a significant clinical concern requiring accurate and accessible diagnostic methods.
- Existing paraquat quantitation methods may be complex or costly, limiting their widespread use.
Purpose of the Study:
- To develop and validate an inexpensive, sensitive, and simple method for paraquat quantitation in human plasma.
- To establish the assay's linearity, limit of quantitation, and assess potential interferences.
Main Methods:
- A cyanopropyl extraction method followed by colorimetric detection using sodium dithionite.
- Paraquat is extracted from plasma, eluted, neutralized, and reacted to produce a measurable color.
- Absorbance is measured at specific wavelengths (A395-A460) to determine paraquat concentration.
Main Results:
- The assay is linear up to 4.35 microM paraquat with a lower limit of quantitation of 0.23 microM.
- Lipemic and icteric samples did not interfere, but hemolysis caused a slight elevation in measured paraquat.
- Diquat showed minimal interference, and coefficients of variation were generally low, indicating good precision.
Conclusions:
- The developed method offers a cost-effective and sensitive approach for paraquat determination in plasma.
- This assay is suitable for routine clinical toxicology screening and monitoring.
- Further validation may be needed to fully account for potential interferences like hemolysis.