A novel bead-based fluorescence immunoassay for aldosterone.

Area of Science:

• Endocrinology
• Assay Development
• Biotechnology

Background:

• Aldosterone quantification is crucial for evaluating the renin-angiotensin-aldosterone system.
• Simultaneous measurement of multiple hormones is often desired but challenging.
• Existing methods may require larger sample volumes or lack multiplexing capabilities.

Purpose of the Study:

• To develop a sensitive competitive bead immunoassay for aldosterone detection using Luminex technology.
• To enable simultaneous quantification of aldosterone with other hormones in small sample volumes.
• To validate the assay's performance in human and mouse samples.

Main Methods:

• Development of a competitive bead immunoassay utilizing Luminex technology.
• Use of two-antibody coupled beads and biotinylated aldosterone as a tracer.
• Inclusion of an extraction step for sample preparation.
• Validation in human and mouse biological matrices.

Main Results:

• The assay demonstrated a linear working range of 10 to 1,000 pg/mL.
• High reproducibility and precision were observed with intra-assay CVs (6.0-11.2%) and inter-assay CVs (8.0-13.0%).
• Excellent correlation (r = 0.96) was found with the reference method, with good recovery (90-110%) and linearity (89-107%).

Conclusions:

• A novel, sensitive, and reproducible bead-based immunoassay for aldosterone quantification was successfully established.
• The assay requires only a small sample volume (50 µL) and facilitates multiplexing.
• This platform enhances efficiency and conserves precious samples for simultaneous hormone analysis.