Biotin-PEG2-C1-aldehyde is widely used in bioconjugation and labeling applications due to its unique functional groups. The biotin moiety allows for strong and specific binding to avidin or streptavidin, making it ideal for immobilizing biomolecules on surfaces or in assays. The PEG2 linker enhances solubility and reduces steric hindrance, improving the efficiency of conjugation. The aldehyde group enables covalent attachment to primary amines, such as those found in proteins or peptides, facilitating the creation of stable biotinylated complexes. This compound is particularly useful in immunoassays, protein purification, and targeted drug delivery systems, where precise and stable bioconjugation is essential. Additionally, it is employed in research applications like fluorescence labeling and surface modification for biosensors.