A heterogeneous fluorescence immunoassay for gentamicin using a second antibody separation

Area of Science:

• Analytical Chemistry
• Biochemistry
• Clinical Diagnostics

Background:

• Accurate monitoring of antibiotic levels, such as gentamicin, is crucial for effective therapeutic drug monitoring.
• Existing methods like radioimmunoassay (RIA) may have limitations in terms of convenience or potential interferences.
• Fluorescence immunoassays (FIA) offer a sensitive detection method for small molecules.

Purpose of the Study:

• To develop and validate a heterogeneous fluorescence immunoassay (FIA) for the quantification of gentamicin.
• To assess the performance of the developed FIA by comparing it with a standard radioimmunoassay (RIA).
• To evaluate the suitability of FIA as a precise, accurate, and convenient method for gentamicin monitoring.

Main Methods:

• Development of a heterogeneous fluorescence immunoassay (FIA) utilizing a second antibody separation technique.
• Separation of bound and free fluorescence labels to minimize endogenous fluorescent interferences.
• Validation of the FIA method through correlation analysis with a gold-standard radioimmunoassay (RIA).

Main Results:

• The developed heterogeneous FIA successfully quantified gentamicin.
• The separation method effectively removed endogenous fluorescent interferences, enhancing assay specificity.
• An acceptable correlation (r = 0.91) was observed between the FIA and the standard RIA, indicating good agreement.
• The FIA demonstrated precision and accuracy in gentamicin measurements.

Conclusions:

• A heterogeneous fluorescence immunoassay (FIA) is a viable and effective method for gentamicin quantification.
• The FIA offers a precise, accurate, and convenient alternative to radioimmunoassay (RIA) for monitoring antibiotic levels.
• This assay has potential applications in clinical laboratories for therapeutic drug monitoring of gentamicin.