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vol.58 issue1A comparative study of 0.125% racemic bupivacaine (S50-R50) and 0.125% and 0.25% 50% enantiomeric excess bupivacaine (S75-R25) in epidural anesthesia for labor analgesiaTopical anesthesia associated with sedation for phacoemulsification: experience with 312 patients author indexsubject indexarticles search
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Revista Brasileira de Anestesiologia

Print version ISSN 0034-7094On-line version ISSN 1806-907X


TANAKA, Pedro Paulo et al. Preparation, characterization and in vitro evaluation of 50% enantiomeric excess bupivacaine (S75-R25)-loaded microspheres. Rev. Bras. Anestesiol. [online]. 2008, vol.58, n.1, pp.15-22. ISSN 0034-7094.

BACKGROUND AND OBJECTIVES: Microspheres can be used as a controlled delivery system to prolong the duration of action of local anesthetics. The objective of this study was the preparation, characterization and analysis of the in vitro release of 50% enantiomeric excess bupivacaine (S75-R25)-loaded microspheres. METHODS: Microspheres were prepared using the copolymer of polylactide-co-glycolic acid by the spray-dryed method. RESULTS: Characterization of microspheres regarding their size and content were similar to the theoretical values. The in vitro release demonstrated a biphasic pattern. CONCLUSIONS: Manufacturing of 50% enantiomeric excess bupivacaine-loaded microspheres by the spray-dryed method with results similar to bupivacaine-loaded microspheres can be done.

Keywords : ANESTHETICS, Local [bupivacaine].

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