DPPE-PEG2000 ammonium (16:0 PEG2000 PE ammonium) is a PEG-modified lipids. DPPE-PEG2000 can reduce the nonspecific adsorption of protein and prolong circulation time in vivo. DPPE-PEG2000 can be used in liposome preparation. DPPE-PEG2000 is also used in preparation of tripeptide arginine-glycine-aspartic acid magnetoliposomes and poly (ethylene glycol) (PEG) – MLPs[1][2][3].