18:1 PEG350 PE is a PEG lipid functional end group used in synthesizing liposomes (LPs) that is designed for the creation of conjugated polymer nanoparticles. Liposome nanoparticles (LNPs) can couple with other biomolecules through biotin modifications and carboxyl terminals. Functionalized nanoparticles are employed for targeted labeling of specific cell proteins. With streptavidin as a linker, biotinylated PEG lipid-conjugated polymer nanoparticles can bind to biotinylated antibodies on cell surface receptors, facilitating fluorescence-based imaging and sensing applications.