title: Ultrasonically induced release from nanosized polymer vesicles.
abstract: Vesicles made from synthetic diblock copolymers, polymersomes, have great potential for targeted imaging and drug delivery. Ultrasound is gaining attention as a therapeutic tool in addition to its use in diagnostics. We report on the response of nanoscale vesicles made from PEO-b-PBD copolymers to ultrasound at 20 kHz. Leakage of a fluorescent dye from vesicle core was measured to study the permeation. Ultrasound causes significant leakage from the core above threshold intensity, suggesting that leakage is governed by acoustic cavitation. Size measurements and direct visualization of vesicles show that ultrasound does not completely rupture them into fragments but causes transient poration. The extent of leakage inversely depends on membrane thickness and directly depends on sonication time and intensity.
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 210 S 33rd Street, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Gautam D
authors.initials: GD
authors.lastname: Pangu
authors.forename: Kevin P
authors.initials: KP
authors.lastname: Davis
authors.forename: Frank S
authors.initials: FS
authors.lastname: Bates
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Hammer
mesh_terms: D002070:Butadienes / Q000737:chemistry*; D003692:Delayed-Action Preparations / Q000737:chemistry*; D016503:Drug Delivery Systems / Q000379:methods*; D005456:Fluorescent Dyes / Q000737:chemistry / Q000378:metabolism; D008051:Lipid Bilayers / Q000737:chemistry; D053769:Nanocapsules / Q000737:chemistry*; D054118:Nanospheres / Q000737:chemistry*; D010539:Permeability; D020959:Polyethylene / Q000737:chemistry*; D013010:Sonication; D014465:Ultrasonics
chemical_list: D002070:Butadienes; D003692:Delayed-Action Preparations; D005456:Fluorescent Dyes; D008051:Lipid Bilayers; D053769:Nanocapsules; C473741:poly(1,2-butadiene-b-ethylene oxide); D020959:Polyethylene