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        Preparation and In Vivo Evaluation of Huperzine A-Loaded PLGA Microspheres

        XU-DONG FU,YONG-LIANG GAO,QI-NENG PING,Tang Ren 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.9

        Huperzine A-loaded microspheres composed of poly(D,L-lactide-co-glycolide) were prepared by an O/W emulsion solvent evaporation method. The characterization of the microspheres such as drug loading, size, shape and release profile was described. The in vitro release in the initial 7 days was nearly linear with 10% released per day. Thereafter drug release rate became slow gradually and about 90% drug released at day 21. The in vitro release rate determined by dialysis bag method had a good correlation with the in vivo release rate. Huperzine A aqueous solution was intramuscularly injected (i.m.) at 0.4 mg/kg and microspheres were intramuscularly injected at 8.4 mg eq huperzine A/kg in rats. The maxium plasma concentration (Cmax ) after i.m. microspheres was only 32% of that after i.m. solution. Drug in plasma could be detectd until day 14 and about 8% of administered dose was residued at the injection site at day 14. The relative bioavailability of huperzine A microspheres over a period of 14 days was 94.7%. Inhibition of acyecholinesterase activity (AchE) in rat’s cortex, hippocampus and striatum could sustain for about 14 days. In conclusion, huperzine A-loaded microspheres possessed a prolonged and complete drug release with significant inhibition of AchE for 2 weeks in rats.

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