Polymeric lamellar substrate particles for drug delivery

摘要

PCT No. PCT/GB96/01695 Sec. 371 Date Mar. 30, 1998 Sec. 102(e) Date Mar. 30, 1998 PCT Filed Jul. 15, 1996 PCT Pub. No. WO97/02810 PCT Pub. Date Jan. 30, 1997The invention provides a composition for delivery of an active agent comprising a plurality of lamellar particles of a biodegradable polymer which is at least in part crystalline, and an active agent adsorbed to at least most of the particles. Preferably the biodegradablepolymer is at least 5% by weight crystalline. Preferred biodegradable polymers are poly(L-lactide) (L.PLA) or copolymers or blends of L.PLA. The particles are especially useful for the immobilization of antigens or allergens for vaccines.