Simplified radioenzymatic assay for chloramphenicol

Area of Science:

• Biochemistry
• Analytical Chemistry
• Clinical Diagnostics

Background:

• Chloramphenicol is an antibiotic requiring precise therapeutic drug monitoring.
• Existing radioenzymatic assays for chloramphenicol often involve complex extraction procedures.
• Accurate and efficient methods are crucial for clinical laboratory analysis.

Purpose of the Study:

• To develop a simplified and efficient radioenzymatic assay for chloramphenicol.
• To eliminate the need for cumbersome extraction in chloramphenicol quantification.
• To establish an assay suitable for routine clinical use.

Main Methods:

• A simplified radioenzymatic assay utilizing chloramphenicol acetyltransferase and [(14)C]acetyl coenzyme A.
• Direct counting of the radioactive product, (14)C-acetylated chloramphenicol, in a toluene-based scintillation fluid.
• Comparison of assay results using standards prepared in serum versus saline, cerebrospinal fluid, and urine.

Main Results:

• The developed assay eliminates the need for extraction, streamlining the process.
• (14)C-acetylated chloramphenicol exhibited higher solubility in toluene than the substrate, allowing direct radioactive counting.
• Assay results for standards prepared in serum were up to 25% higher compared to those in other matrices.

Conclusions:

• The simplified radioenzymatic assay is rapid, accurate, precise, and specific for chloramphenicol.
• This method is highly suitable for clinical applications due to its efficiency.
• Matrix effects, particularly in serum, should be considered when interpreting assay results.