Avidin from egg white is widely used in biotechnology and biochemical research due to its strong affinity for biotin. This property makes it an essential tool in techniques like ELISA (Enzyme-Linked Immunosorbent Assay) and immunohistochemistry, where it is used to detect and visualize biotinylated molecules. It is also employed in affinity chromatography to purify biotinylated proteins or nucleic acids. Additionally, avidin is utilized in drug delivery systems, where it helps target biotin-conjugated therapeutic agents to specific cells or tissues. Its application extends to diagnostic kits, where it enhances the sensitivity and specificity of assays.