Preparation of submicron liposomes exhibiting efficient entrapment of drugs by freeze-drying water-in-oil emulsions

• Published in: Chemistry and physics of lipids Vol. 164; no. 2; pp. 151 - 157
• Main Authors: Wang, Ting, Wang, Ning, Wang, Tongyan, Sun, Weiran, Li, Tiefu
• Format: Journal Article
• Language: English
• Published: Ireland Elsevier Ireland Ltd 01.02.2011
• Subjects: Drug Storage; drugs; Emulsions; Encapsulation; ethylene glycol; Freeze Drying; hydrophilicity; Hydrophobic and Hydrophilic Interactions; Liposomes - chemistry; Microscopy, Electron, Scanning; oils; Oils - chemistry; Particle Size; Phospholipid; phospholipids; Phospholipids - chemistry; Polyethylene glycol; Polyethylene Glycols - chemistry; rehydration; Reproducibility of Results; scanning electron microscopy; Scattering, Small Angle; Solid dispersion; Solvents - chemistry; storage time; sucrose; Sucrose - chemistry; Vesicle; Water - chemistry; X-radiation; X-Ray Diffraction; EE; SUC; Vesicle; Encapsulation; Particle size; FDE; SPC; Phospholipid; Solid dispersion; CHO; LUV; FLU; BER; SSS; PEG; PAE; FWE; Polyethylene glycol; MLV; SPS; FOE
• ISSN: 0009-3084; 1873-2941
• DOI: 10.1016/j.chemphyslip.2010.12.005

A novel liposome preparation method is described as freeze-drying of water-in-oil emulsions containing sucrose in the aqueous phase (W) and phospholipids and poly(ethylene glycol)1500 (PEG) in the oil phase (O). The water-in-oil emulsions were prepared by sonication and then lyophilized to obtain dry products. Upon rehydration, the dry products formed liposomes with a size smaller than 200nm and an encapsulation efficiency (EE) higher than 60% for model drugs. The presence of lyoprotectant and PEG was found to be a prerequisite for the formation of liposomes with desirable properties, such as a small particle size and high EE. The lyophilates were stable and could be rehydrated to form liposomes without any change in size or EE even after a storage period of 6 months. Also, the lipophilic drug-containing FWE liposomes were stable and could be stored for at least 6 months although the liposomes containing hydrophilic drugs showed significant leakage. Based on the vesicle size and EEs of the model drugs, as well as the scanning electron micrograph (SEM) and small angle X-ray scattering (SAXS) pattern of the lyophilates, a possible mechanism for the liposome formation is proposed.