m-PEG19-alcohol is widely used in the field of bioconjugation and drug delivery due to its ability to improve the solubility, stability, and bioavailability of therapeutic compounds. It is often attached to proteins, peptides, or small molecules to enhance their pharmacokinetic properties, reducing immunogenicity and prolonging circulation time in the body. This makes it a valuable component in the development of long-acting pharmaceuticals, particularly in cancer therapy and targeted drug delivery systems. Additionally, m-PEG19-alcohol is utilized in the synthesis of hydrogels and other biomaterials for tissue engineering and regenerative medicine, where its hydrophilic properties help create biocompatible and water-absorbing structures. Its role in surface modification of nanoparticles further aids in creating stealth carriers for drug delivery, minimizing recognition by the immune system.