[Rapid determination of valproic acid using instantaneous silylation]

Area of Science:

• Analytical Chemistry
• Clinical Chemistry

Background:

• Accurate measurement of valproic acid is crucial for therapeutic drug monitoring.
• Existing methods may be time-consuming or expensive.

Purpose of the Study:

• To develop and validate a novel, rapid, and cost-effective method for quantifying valproic acid in human plasma.
• To assess the accuracy, precision, and potential interferences of the proposed assay.

Main Methods:

• Gas phase chromatography utilizing an OV1 column, typically used for steroid analysis.
• Direct plasma extraction of valproic acid from small sample volumes (200 microliters).
• Instantaneous silylation performed at the injector port.

Main Results:

• The method demonstrated excellent accuracy and precision.
• No significant interference was observed from other co-administered anti-convulsant drugs.
• The assay is characterized by its simplicity and speed.

Conclusions:

• The proposed gas chromatography technique provides a reliable and efficient means for valproic acid measurement.
• Its speed, cost-effectiveness, and accuracy suggest broad applicability in routine clinical practice.
• This method can aid in optimizing valproic acid therapy and patient management.