A suspension array immunoassay for the toxin simulant ovalbumin.

Area of Science:

• Biochemistry
• Analytical Chemistry
• Immunotechnology

Background:

• Immunoassays are crucial for detecting toxins and pathogens.
• Ovalbumin serves as a toxin simulant in assay development.
• Enzyme-linked immunosorbent assay (ELISA) is a common immunoassay technique.

Purpose of the Study:

• To develop and characterize a microsphere-based suspension array (SA) immunoassay for ovalbumin.
• To compare the performance of the SA immunoassay with ELISA for ovalbumin detection.
• To establish a template for developing SA assays for other biological targets.

Main Methods:

• Development and characterization of a microsphere-based suspension array (SA) immunoassay.
• Quantification of ovalbumin using SA immunoassay and ELISA.
• Comparison of limit of detection (LOD), speed, and reproducibility between SA and ELISA.

Main Results:

• The SA ovalbumin assay had a limit of detection (LOD) of 4.9 ng/mL, while ELISA had a LOD of 0.01 ng/mL.
• The SA assay was completed in half the time of the traditional ELISA.
• Well-to-well reproducibility (CV) was 5.1% for SA and 4.9% for ELISA.
• Plate-to-plate reproducibility was 6.1% for SA and 14.8% for ELISA.

Conclusions:

• The SA immunoassay offers a rapid and reproducible method for ovalbumin detection.
• While ELISA has a lower LOD, the SA assay's speed and reproducibility make it a viable alternative.
• The developed SA assay protocol can be adapted for detecting other toxins, bacteria, and viruses.