Calculation of antibody and antigen concentrations from ELISA data using a graphical method

Area of Science:

• Immunology
• Biochemistry
• Computational Biology

Background:

• Enzyme-Linked Immunosorbent Assay (ELISA) is a common immunoassay.
• Accurate quantification of antibody and antigen concentrations is crucial for ELISA data interpretation.
• Existing methods for data analysis can be complex or limited in range.

Purpose of the Study:

• To develop a user-friendly computational tool for ELISA data analysis.
• To provide a method for determining antibody and antigen concentrations from optical density measurements.
• To offer a versatile solution covering both linear and non-linear assay ranges.

Main Methods:

• Development of a GWBASIC program named ELISAEQ.
• Input of optical density (OD) data from 96-well ELISA plates (manual or direct reader interface).
• Application of a least-squares method for data within the semilogarithmic linear range.
• Derivation of a hyperbolic interpolation formula for data beyond the linear range.

Main Results:

• The ELISAEQ program accurately determines antibody or antigen concentrations.
• The program effectively identifies and utilizes the semilogarithmic linear range of ELISA data.
• A hyperbolic interpolation formula extends concentration estimation beyond the linear range, improving accuracy for all samples.

Conclusions:

• The ELISAEQ program offers a robust and accessible method for ELISA data quantification.
• This tool simplifies the determination of antibody and antigen concentrations, enhancing experimental throughput.
• The combined linear and hyperbolic approaches provide a comprehensive solution for ELISA data analysis.