alexa Evaluation of blood clearance rates and biodistribution of poly(2-oxazoline)-grafted liposomes.
General Science

General Science

Journal of Biotechnology & Biomaterials

Author(s): Zalipsky S, Hansen CB, Oaks JM, Allen TM

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Abstract Two amphipatic polymers of the poly(2-oxazoline) family, poly(2-methyl-2-oxazoline) (PMOZ) and poly(2-ethyl-2-oxazoline) (PEOZ), were synthesized with the carboxylic group positioned at either the initiation or termination ends of the polymer chains. Distearoylphosphatidylethanolamine was covalently linked to the carboxyl groups of the polymers, resulting in conjugates which incorporate readily into liposomes. Systematic evaluation of plasma clearance kinetics and biodistribution of liposomes containing hydrogenated soy phosphatidylcholine, cholesterol, and 5 mol \% the polymer-lipid conjugates in mice revealed the following. Both polymers, PMOZ and PEOZ, exhibited long plasma lifetimes and low hepatosplenic uptake. PMOZ was more effective at decreasing blood clearance rates than PEOZ. The best results, which were quantitatively comparable to the results obtained with the optimized preparations of methoxypolyethylene glycol(PEG)-2000-grafted liposomes, were obtained with formulations containing PMOZ of molecular weight 3260. This article was published in J Pharm Sci and referenced in Journal of Biotechnology & Biomaterials

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