Reinforced paucilamellar lipid vesicles
US5104736A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1989 |
| Grant date | Apr 14, 1992 |
| Priority date | — |
| Expiry date | Jun 26, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2984
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Disclosed are paucilamellar lipid vesicles reinforced with polyacrylamide, and methods of producing the same. The vesicles include about 2-10 lipid bilayers in the form of substantially spherical shells separated by a plurality of aqueous layers. Each of the bilayers have a layer of polyacrylamide lining its innermost side. The bilayers and the aqueous layers surround a large, substantially amorphous central cavity containing a water-immiscible oily phase or a polyacrylamide core. The method of the invention includes forming a lipophilic phase containing a surfactant and a lipid-soluble material to be encapsulated or to be incorporated into the lipid structure of the vesicle, forming an aqueous phase containing polyacrylamide; shear mixing the lipophilic phase and the aqueous phase, thereby forming a plurality of paucilamellar lipid vesicles containing acrylamide in their aqueous regions; separating the vesicles from any unincorporated vesicle constituents; and polymerizing the acrylamide in the aqueous layers of the vesicles. A method of encapsulating a water-soluble material is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.