Method for utilizing neutral lipids to modify in vivo release fr

Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Liposomes

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424417, 436829, 935 54, A61K 9127

Patent

active

058914676

ABSTRACT:
The rate of release of encapsulated active compound from a multivesicular liposomal (MVL) formulation is modified by selection of a neutral lipid component. A family of MVL formulations containing different slow:fast release neutral lipid molar ratios display different release rates depending upon the molar ratio of the fast release neutral lipid to the slow release neutral lipid in each member. Incubation in plasma or a plasma-like medium at in vivo temperatures so as to obtain a release rate curve for each allows selection from among the members of the family of a liposomal formulation with a desired rate of release in vivo.

REFERENCES:
patent: 5422120 (1995-06-01), Kim
Assil in Arch. Opthal 105, p. 400, Mar. 1987.
Hamilton et al., "Solubilization and Localization of triolein in phosphatidylcholine bilayers: A .sup.13 C NMR study", Proc. Natl. Acad. Sci. USA, vol. 78, No. 11, pp. 6878-6882 (Nov. 1981).
Spooner, et al. "Effect of Free Cholesterol on Incorporation of Triolein in Phospholipid Bilayer", Biochemistry, 26:5820-5825 (1987).

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