Quantitative Method for Simultaneous Analysis of Acetaminophen and 6 Metabolites

Area of Science:

• Analytical Chemistry
• Pharmacology
• Toxicology

Background:

• Acetaminophen (APAP) hepatotoxicity is linked to its metabolites, necessitating accurate quantification.
• Existing methods for APAP and metabolite analysis are often time-consuming due to complex sample preparation and long run times.
• Understanding factors influencing APAP toxicity requires sensitive and efficient analytical techniques.

Purpose of the Study:

• To develop and validate a simplified, sensitive liquid chromatography-mass spectrometry (LC-MS) method for simultaneous quantification of APAP and its major metabolites.
• To reduce sample preparation complexity and chromatographic run time compared to existing methods.
• To provide a valuable analytical tool for clinical and research applications related to APAP toxicity.

Main Methods:

• Developed a single, simplified sample preparation protocol for human plasma.
• Employed liquid chromatography with mass spectrometric (LC-MS) detection.
• Validated the method for selectivity, linearity, accuracy, imprecision, recovery, and efficiency with a 9-minute run time.

Main Results:

• The method demonstrated excellent selectivity, with no significant matrix interferences.
• High process efficiency (>86%) and ionization efficiency (>94%) were achieved for all analytes.
• The method exhibited good accuracy (90.3%–112%) and low imprecision (<20% at LLOQ, <14.3% at other levels).

Conclusions:

• A simplified and sensitive LC-MS method for simultaneous quantification of APAP and six key metabolites was successfully developed and validated.
• This method significantly reduces analysis time due to a single, simple sample preparation step and a short chromatographic run.
• The validated assay is suitable for both clinical diagnostics and research purposes in understanding APAP-induced liver injury.