Solid-phase competitive and sandwich-type erythro-immunoassays for human chorionic gonadotropin

Area of Science:

• Biochemistry
• Immunology
• Analytical Chemistry

Background:

• Human chorionic gonadotropin (hCG) is a crucial biomarker for pregnancy and certain medical conditions.
• Accurate and sensitive detection of hCG is essential for timely diagnosis and monitoring.
• Existing immunoassay methods may have limitations in sensitivity or complexity.

Purpose of the Study:

• To develop and validate a simple and sensitive erythro-immunoassay for human chorionic gonadotropin (hCG).
• To evaluate the performance of a novel sandwich erythro-immunoassay with enhanced sensitivity.
• To assess the applicability of the assay for qualitative and quantitative analysis of hCG in human urine.

Main Methods:

• Development of a 1-step competitive erythro-immunoassay using monoclonal anti-beta-hCG antibody-coated plates.
• Creation of a sandwich erythro-immunoassay utilizing a chimera antibody for increased sensitivity.
• Testing the assay's ability to detect varying concentrations of hCG.
• Validation using human urine samples and comparison with established enzyme immunoassay and radioimmunoassay methods.

Main Results:

• The 1-step competitive assay detected hCG up to 31.25 ng/ml.
• The sandwich erythro-immunoassay achieved a significantly higher sensitivity, detecting down to 0.25 ng/ml.
• Urinary components did not interfere with the assay's performance.
• Results from 47 human urine samples showed good correlation with established methods.

Conclusions:

• The developed erythro-immunoassay, particularly the sandwich format, offers a sensitive and reliable method for hCG detection.
• The assay is suitable for both qualitative and quantitative analysis of hCG in urine.
• This method provides a valuable alternative to existing diagnostic tools for hCG measurement.