Quantitative determination of acetaminophen in plasma

Area of Science:

• Pharmacology
• Analytical Chemistry
• Biochemistry

Background:

• Accurate quantification of acetaminophen (APAP) in biological samples is crucial for pharmacokinetic and toxicological studies.
• Existing methods for APAP analysis may be time-consuming or require specialized equipment.
• Development of rapid and simple analytical techniques is needed for clinical and research settings.

Purpose of the Study:

• To describe a straightforward and rapid quantitative method for determining acetaminophen levels in plasma.
• To validate the method's applicability in a preclinical setting.

Main Methods:

• Acetaminophen and its conjugates in plasma are hydrolyzed using 4 N hydrochloric acid (HCl) to yield p-aminophenol.
• The resulting p-aminophenol is coupled with a 5% vanillin reagent.
• The concentration of the formed yellow color is measured spectrophotometrically at 395 nm.

Main Results:

• The described method allows for rapid quantitative analysis of acetaminophen in plasma.
• The spectrophotometric detection at 395 nm provides a reliable measure of acetaminophen concentration.
• The method was successfully applied to analyze acetaminophen levels in dogs post-administration.

Conclusions:

• A simple, rapid, and effective spectrophotometric method for plasma acetaminophen analysis has been developed.
• This method is suitable for pharmacokinetic studies and therapeutic drug monitoring.
• The technique offers a valuable tool for assessing acetaminophen levels in biological matrices.