Lyophilized PEGylated Anionic Liposomes

Lyophilized liposomes product series are freeze-dried liposomes with various types of lipids and wide range of zeta potentials and different properties. These products should be used by scientists who understand liposome formulation and have the proper equipment to check the size, separate non-encapsulated drugs and do the proper assays.
Liposomes are extensively used to study the interaction of proteins, peptides and other molecules with the surface of a lipid membrane. One of the parameters that affects this interaction is the charge of the liposomal membrane. Liposomes are always made in aqueous environment and they are sized to the desired size in liquid state using various methods such as high-pressure extrusion through nano sized pore track etch membranes. In rare occasions, liposomes are freeze dried and proliposomes are formed in the presence of a lyoprotectant such as trehalose. Using a lyoprotectant is necessary in order to maintain the size of the liposomes after rehydration.
To improve liposome stability and enhance their circulation times in the blood, a sterically stabilized, hydrophilic polymer, polyethylene glycol (PEG), has been shown to be the optimal choice for obtaining sterically stabilized liposomes. Using a Neutral Liposome with PEG will protect the liposomes from circulating proteins, improving their plasma clearance and enhancing their therapeutic effects.
Anionic liposomes demonstrate greater stability in solution, lead to lower aggregation when compared with neutrally charged liposomes, and have increased endocytosis when compared with cationic and neutral liposomes.