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.

Abstract: This invention provides a multilamellar liposome containing an arachidonic acid metabolite, two or more lipid-containing bilayers and two or more aqueous compartments containing a release-inhibiting buffer. Preferred arachidonic acid metabolites are the prostaglandins, particularly PGE.sub.1. The liposomal formulations can be used to treat animals, particularly humans, for diseases, disorders or conditions which can be ameliorated by prostaglandins, e.g., disorders characterized by cellular activation and adhesion, inflammation and/or toxemia.

Abstract: A liposome composition and methods for making same are disclosed, such compositions comprise an arachidonic acid metabolite such as a prostaglandin, preferably prostaglandin E.sub.1, a lipid, and a drying protectant such as a saccharide. The liposomes may be loaded with prostaglandin passively, or using a transmembrane concentration gradient, preferably using a transmembrane pH gradient. Using this transmembrane loading technique, trapping efficiencies of 50% to 100% are achieved, and the release rate of the prostaglandin from the liposomes is reduced. The liposome size is maintained after lyophilization and reconstitution.

Abstract: A liposome composition and methods for making same are disclosed, such compositions comprise an arachidonic acid metabolite such as a prostaglandin, preferably prostaglandin E.sub.1, a lipid, and a drying protectant such as a saccharide. The liposomes may be loaded with prostaglandin passively, or using a transmembrane concentration gradient, preferably using a transmembrane pH gradient. Using this transmembrane loading technique, trapping efficiencies of 50% to 100% are achieved, and the release rate of the prostaglandin from the liposomes is reduced. The liposome size is maintained after lyophilization and reconstitution.

Abstract: Hydroxyalkyl celluloses are useful as sedimenting agents in the non-destructive separation of red and white blood cells. Intact WBC recovery is higher than with conventional methods. The white blood cells may be used in interferon production.