Method of preparing controlled-release preparations for biologically active materials and resulting compositions
US5151272A · kind A · utility
161Cited by
9References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1990 |
| Grant date | Sep 29, 1992 |
| Priority date | — |
| Expiry date | Jun 18, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2984
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method and product for preparing a controlled-release composition are provided. The method comprises formation of a mixture containing at least one amphiphilic substance capable of forming a liquid crystalline phase, in contact with a liquid selected from the group consisting of water, glycerol, ethylene glycol, propylene glycol and mixtures thereof. The method includes a step of providing in such mixture a bioactive material. Preferred controlled-release compositions include an alkylbetaine zwitterionic surfactant therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.