Preparation of controlled release spheronized beads by a simple extrusion and modified spheronization process

Sibeum Lee, Min Soo Kim, Wook Jun Seoung, Jeong Sook Park, Sung Joo Hwang

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Beads loaded with the water-soluble drug, phenylpropanolamine HCl (PPA), were prepared using an extruder and double arm counter-rotating roller modified from a traditional pill machine. The mean diameter of the cylindrical rod-like extrudate from the ram extruder was 3 mm; that of the uncoated bead after cutting and spheronization by the modified double arm counter-rotating roller was 3.26~3.28 mm. Although the surface of the beads was moderately rough and irregular, some exhibited hump-shaped protrusions, the sphericity was acceptable (roundness 1.15) and adequate for the subsequent coating process. An increase in mean diameter of the coated beads and improvements in friability and sphericity were observed in proportion to the amount of coating material applied (ethylcellulose or Eudragit® RS 100). It was also found that the release rate of PPA from the coated beads could be controlled by the amount and type of coating materials applied or with the incorporation of Eudragit® RS 100 into the core matrix. Further modifications to the double arm counter-rotating roller, including adjustment of the rotation speed and distance between the rollers, would yield smaller uncoated beads with improved roundness and surface roughness. In conclusion, the present method could be potentially applied to prepare controlled release drug delivery beads or pellet dosage forms.

Original languageEnglish
Pages (from-to)619-625
Number of pages7
JournalArchives of pharmacal research
Issue number5
Publication statusPublished - 2005 May 31

All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Drug Discovery
  • Organic Chemistry


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