Sphingosomes for enhanced drug delivery
First Claim
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1. A liposome for delivery of an alkaloid therapeutic compound, produced by the process of:
- forming a liposome from a mixture which comprises sphingomyelin and cholesterol, in a first buffered aqueous solution having an acidic pH greater than pH 2; and
suspending the liposome in a second buffered solution having a pH which is greater than that of the first buffered aqueous solution, whereby a transmembrane pH gradient is formed which facilitates the transfer of the therapeutic compound to the liposome.
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Abstract
Liposomal formulations having extended circulation time in vivo and increased drug retention are comprised of sphingomyelin and cholesterol and have an acidic intraliposomal pH. The formulations have enhanced stability and thus are used in methods which provide improved drug delivery and more effective treatment. The delivery of ciprofloxacin, and alkaloid drugs, particularly swainsonine, vincristine and vinblastine, is significantly improved.
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12 Claims
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1. A liposome for delivery of an alkaloid therapeutic compound, produced by the process of:
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forming a liposome from a mixture which comprises sphingomyelin and cholesterol, in a first buffered aqueous solution having an acidic pH greater than pH 2; and suspending the liposome in a second buffered solution having a pH which is greater than that of the first buffered aqueous solution, whereby a transmembrane pH gradient is formed which facilitates the transfer of the therapeutic compound to the liposome. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification