Drug particle size influence on enteric beads produced by a droplet extrusion/precipitation method.

Abstract:

:The influence of drug particle size on the production of enteric beads by a polymer precipitation technique was investigated. Drug particle dimensions are known to play an important role in most microencapsulation techniques. Bead morphology was greatly influenced by drug particle size, and spherical shaped beads could only be obtained after size reduction of nimesulide crystals. This is confirmed by the angle of repose measurements, which show a significant decrease in theta values when beads are formulated with smaller drug particles. Furthermore, results show that drug encapsulation efficiency and in vitro drug release rates are also greatly dependent on both drug particle size and drug/polymer ratio in the initial suspension. Preparations containing 10.2 microm drug particles show a two-fold increase in the release rates when compared to those prepared with 40 microm particles.

journal_name

J Microencapsul

authors

Cerdeira AM,Gouveia LF,Goucha P,Almeida AJ

doi

10.1080/02652040050161729

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

733-41

issue

6

eissn

0265-2048

issn

1464-5246

journal_volume

17

pub_type

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