New spectrophotofluorometric assay for probenecid

Area of Science:

• Analytical Chemistry
• Biochemistry
• Pharmacology

Background:

• Probenecid is a medication used to treat hyperuricemia.
• Accurate quantification of probenecid in biological samples is crucial for therapeutic drug monitoring and pharmacokinetic studies.
• Existing methods, such as UV spectrophotometry, may lack the sensitivity required for certain applications.

Purpose of the Study:

• To develop and validate a novel spectrophotofluorometric assay for the sensitive and accurate determination of probenecid.
• To evaluate the applicability of the new assay in biological matrices, specifically "clean" fluids like cerebrospinal fluid.

Main Methods:

• The assay involves the chemical conversion of probenecid into a fluorescent anthranilic acid derivative.
• Spectrophotofluorometry was employed for the quantitative measurement of the fluorescent product.
• The assay's performance characteristics, including sensitivity and applicability, were assessed using biological fluid samples.

Main Results:

• The developed assay demonstrated significantly higher sensitivity compared to the conventional UV method.
• The spectrophotofluorometric assay proved effective for probenecid quantification in "clean" biological fluids.
• The conversion to a fluorescent derivative facilitated sensitive detection of probenecid.

Conclusions:

• A sensitive and reliable spectrophotofluorometric assay for probenecid has been established.
• This new assay offers a valuable alternative to existing methods, especially when high sensitivity is required.
• The assay is particularly well-suited for analyzing probenecid in "clean" biological samples such as cerebrospinal fluid.