Lipid-polymer conjugates and liposomes
First Claim
1. A liposomal composition containing liposomes composed of vesicle-forming lipids and between 1-30 mole percent of a lipid-polymer conjugate composed ofa lipid having a hydrophobic moiety and a polar head group, andcovalently attached to the lipid head group, a homopolymer chain composed of polymethyloxazoline.
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Abstract
A lipid-polymer conjugate for use in forming long-circulating liposomes is disclosed. The conjugate includes a vesicle-forming lipid having covalently attached to its polar head group, one of the polymers: polyvinylpyrrolidone, polyvinylmethylether, polyhydroxypropyl methacrylate, polyhydroxypropylmethacrylamide, polyhydroxyethyl acrylate, polymethacrylamide, polydimethylacrylamide, polymethyloxazoline, polyethyloxazoline, polyhydroxyethyloxazoline, polyhydroxypropyloxazoline, or polyaspartamide. A method for preparing liposomes containing the lipid-polymer conjugate is also disclosed.
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6 Claims
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1. A liposomal composition containing liposomes composed of vesicle-forming lipids and between 1-30 mole percent of a lipid-polymer conjugate composed of
a lipid having a hydrophobic moiety and a polar head group, and covalently attached to the lipid head group, a homopolymer chain composed of polymethyloxazoline.
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5. A method of preparing liposomes characterized by an extended blood circulation time, comprising
adding to vesicle-forming lipids, between 1-30 mole percent of a lipid-polymer conjugate composed of a lipid having a hydrophobic moiety and a polar head group, and covalently attached to the lipid head group, a homopolymer chain composed of polymethyloxazoline, forming liposomes containing said vesicle-forming lipids and said lipid-polymer conjugate, and containing a pharmaceutical compound in entrapped form, and sizing the liposomes to a selected size in the size range between about 0.05 to 0.5 microns, where the added conjugate is effective to extend the circulation time of the liposomes when compared to liposomes prepared in the absence of said conjugate.
Specification