Comparison of four distinct detection platforms using multiple ligand binding assay formats

Area of Science:

• Biochemistry
• Analytical Chemistry
• Assay Development

Background:

• Ligand binding assays (LBA) are vital for biotherapeutic quantitation.
• Various detection platforms exist, but direct comparisons for interchangeability are scarce.
• Claims of superior sensitivity and dynamic range among platforms lack comprehensive validation.

Purpose of the Study:

• To evaluate and compare the interchangeability of four common LBA detection platforms.
• To assess sensitivity and dynamic range across different LBA formats.
• To provide data-driven insights for selecting optimal detection platforms.

Main Methods:

• Compared colorimetric, chemiluminescence, time-resolved fluorescence (TRF), and electrochemiluminescence (ECL) detection platforms.
• Utilized five distinct LBA protocols: direct binding, sandwich ELISA, competitive, and cell-based ELISA.
• Evaluated sensitivity and dynamic range for each platform-assay combination.

Main Results:

• No single detection platform consistently outperformed others across all tested LBA protocols.
• Predicting the best-performing platform for a specific assay protocol was not feasible.
• Observed significant assay-specific differences, including plate coating efficiency and low signal issues, complicating platform selection.

Conclusions:

• The selection of a detection platform for LBAs is highly assay-dependent.
• Developing new LBA protocols requires testing multiple detection platforms to ensure optimal performance.
• This comparative study highlights the need for empirical validation rather than relying on general platform claims.