Antibody System Anti-Cosibelimab ELISA Kit

Principle of the Assay

This assay utilizes a high-performance, solid-phase quantitative sandwich enzyme immunoassay technique (bridging format) to measure specific anti-drug antibody levels:

• Target Capture: Recombinant Cosibelimab is uniformly pre-coated onto the solid-phase surface of a 96-well microplate.

• Specific Binding: Calibrated standards or unknown biological samples are pipetted directly into the microwells. Endogenous Anti-Cosibelimab antibodies present in the sample are bound and captured by the immobilized Cosibelimab proteins.

• Bridging Conjugation: Unbound matrix elements are removed via a rigorous wash cycle. A biotin-labeled Cosibelimab tracer solution is introduced into the wells, binding to the open antigen-binding sites of the captured Anti-Cosibelimab target, effectively forming an immune bridging complex.

• Enzyme Complexing: Following another wash step to clear unbound tracer, Streptavidin conjugated to Horseradish Peroxidase (Streptavidin-HRP) is added to bind specifically to the biotinylated domains.

• Signal Amplification and Readout: After a final wash to remove excess enzyme reagent, a colorimetric substrate solution is added to initiate enzymatic signal development. Because this is a bridging sandwich assembly, the resulting color intensity develops in direct proportion to the concentration of Anti-Cosibelimab bound in the initial step. The reaction is terminated with a stop solution, and absorbance is quantified spectrophotometrically.

Key Features and Performance Metrics

• Sensitive Detection Capability: Exhibits an analytical sensitivity down to 133.24 ng/mL, facilitating the early tracking of low-level anti-drug antibody formations.

• Extended Quantitative Range: Delivers a wide dynamic tracking range from 156.25 ng/mL to 10,000 ng/mL to accommodate diverse sample concentration tiers without immediate saturation.

• Exceptional Intra-Assay Precision: Demonstrates excellent target reproducibility with a Coefficient of Variation (CV) of less than 10 percent, verified through sixteen separate replicate evaluations across three samples of known concentration on a single test plate.

• High Inter-Assay Uniformity: Confirms outstanding day-to-day and batch-to-batch experimental reliability with a CV of less than 15 percent, validated across twenty-four distinct assay runs using three independent reference concentration samples.

Technical Specifications

• Catalog No.: KAJ70104

• Assay Configuration: Quantitative Bridging Sandwich Enzyme Immunoassay

• Targeted Biomarker: Anti-Cosibelimab (Anti-Drug Antibodies / ADA)

• Validated Matrices: Serum and Plasma

• Assay Range: 156.25 to 10,000 ng/mL

• Analytical Sensitivity: 133.24 ng/mL

• Solid-Phase Target: Recombinant Cosibelimab

• Detection Enzyme Layer: Biotin-Cosibelimab / Streptavidin-HRP Conjugate

Applications and Workflow Summary

This bridging sandwich ELISA platform is highly optimized for therapeutic drug immunogenicity monitoring and downstream pharmacokinetic profiling. Investigators should observe the following guidelines:

• Dilution and Layout: Unknown serum or plasma matrices must be screened alongside the provided reference standards. Samples exhibiting target concentrations exceeding the maximum range of 10,000 ng/mL must be diluted empirically in standard assay matrix buffer prior to running the assay.

• Analysis Requirements: To achieve absolute quantification accuracy, investigators must generate a standard curve simultaneously during every plate run, plotting standard absorbance profiles against log-transformed concentration values.

Handling, Stability and Storage

• Kit Shipping: Distributed under secure, temperature-controlled conditions on blue ice or chilled gel packs to safeguard protein matrix and enzyme binding configurations.

• Operational Stability: Built with high-grade components to guarantee consistent, low-decay signal retention over a standard six-month framework when kept at the manufacturer-specified storage parameters.

• Storage Guidance: Keep the complete kit stored strictly at the recommended refrigeration temperature upon receipt. Ensure that unused microplate wells remain sealed within their original desiccant pouch to guard against moisture compromise.