Lipoamido-PEG4-acid is widely used in bioconjugation and drug delivery systems due to its unique properties. The lipoamide group provides a strong affinity for binding to proteins or peptides, while the PEG4 spacer enhances solubility and reduces immunogenicity. This makes it an ideal linker for attaching therapeutic agents, such as antibodies or small molecules, to nanoparticles or other delivery vehicles. Its carboxylic acid group allows for easy conjugation with amines or other functional groups, enabling precise modification of biomolecules. Applications include targeted cancer therapies, where it helps deliver drugs specifically to tumor cells, and in the development of diagnostic probes for imaging. Additionally, it is used in the creation of bioconjugates for research purposes, facilitating the study of protein interactions and cellular processes. Its versatility and biocompatibility make it a valuable tool in both pharmaceutical and biotechnological fields.