Aminooxy-PEG8-acid is widely used in bioconjugation and chemical biology for its ability to form stable oxime bonds with carbonyl-containing molecules. It is particularly valuable in the modification of proteins, peptides, and antibodies, enabling the attachment of functional groups or labels for imaging, therapeutic, or diagnostic purposes. The PEG (polyethylene glycol) spacer enhances solubility and reduces immunogenicity, making it suitable for applications in drug delivery systems and targeted therapies. Additionally, it is employed in the development of bioconjugates for research in cell surface engineering and biomaterial functionalization. Its reactivity with aldehydes and ketones also makes it useful in the synthesis of glycoconjugates and other complex biomolecules.