Method for size separation of particles
First Claim
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1. A method of producing nonliposomal lipid particles of a homogeneous, defined size distribution from a mixture of lipid particles of heterogeneous size comprising the steps of:
- (a) subjecting the mixture to tangential flow filtration with a first filter of a first pore size;
(b) subjecting the filtrate from step (a) to tangential flow filtration with a second filter of a second, smaller pore size; and
(c) collecting the retentate from step (b),wherein the first pore size defines the upper limit of the size distribution of the liposomes or lipid particles, the first pore size is between about 10 and about 0.2 microns, the second pore size defines the lower limit of size distribution of the particles and the second pore size is between about 2000 molecular weight and about 2 microns.
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Abstract
Tangential flow filtration is used in the size separation of particles, such as liposomes and lipid particles. These particles may be passed through a tangential flow filtration device of any pore size desired. Tangential flow filter systems of various pore sizes may be used sequentially to obtain particles such as lipid particles or liposomes having a defined size range.
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Citations
12 Claims
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1. A method of producing nonliposomal lipid particles of a homogeneous, defined size distribution from a mixture of lipid particles of heterogeneous size comprising the steps of:
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(a) subjecting the mixture to tangential flow filtration with a first filter of a first pore size; (b) subjecting the filtrate from step (a) to tangential flow filtration with a second filter of a second, smaller pore size; and (c) collecting the retentate from step (b), wherein the first pore size defines the upper limit of the size distribution of the liposomes or lipid particles, the first pore size is between about 10 and about 0.2 microns, the second pore size defines the lower limit of size distribution of the particles and the second pore size is between about 2000 molecular weight and about 2 microns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of producing nonlipoosmal lipid particles of a size having sizes below a defined size cutoff comprising the steps of:
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(a) homogenizing the particles; (b) subjecting the particles to tangential flow filtration with a first filter of a pore size which excludes particles above the defined cutoff; (c) collecting the filtrate from step (b) and, (d) subjecting the collected filtrate from step (c) to tangential flow filtration with a second filter of smaller pore size.
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- 11. A method for preparing a liposome or lipid particle comprising the step of contacting a solution containing lipid to a first side of a filter in tangential flow filtration apparatus while infusing or injecting an aqueous solution to a second side of the filter in the tangential flow filtration apparatus.
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