Study of formulation variables on properties of drug-gellan beads by factorial design

Drug Dev Ind Pharm. 2006 Mar;32(3):315-26. doi: 10.1080/03639040500518930.

Abstract

The aim of the present study was to obtain cross-linked calcium-gellan beads containing diclofenac sodium as model drug, using full 3(3) factorial design. Drug quantity, pH of cross-linking solution, and speed of agitation were selected as variables for factorial design. The resultant beads were evaluated by scanning electron microscopy (SEM), percent yield, entrapment efficiency, micromeritic properties, swelling and drug release studies. The drug-loaded beads were spherical with size range of 0.85-1.8 mm. Percent yield and entrapment efficiency of various batches were in the range of 86.48-98.28% w/w and 72.52-92.74% w/w, respectively. Calcium-gellan beads containing diclofenac sodium showed pH-dependent swelling and drug release properties. Swelling and drug release were significantly higher in pH 7.4 phosphate buffer than 0.1N HCl. The swelling ratio for beads was up to 22 and 3 for phosphate buffer and 0.1N HCl, respectively. Cumulative diclofenac sodium release from calcium-gellan beads was 12-35% in 0.1N HCl within 2 h, whereas complete drug release was observed within 3-4 h in pH 7.4 phosphate buffer.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Calcium Chloride / chemistry
  • Chemistry, Pharmaceutical
  • Diclofenac / chemistry*
  • Hydrogen-Ion Concentration
  • Microscopy, Electron, Scanning
  • Microspheres*
  • Particle Size
  • Polysaccharides, Bacterial / chemistry*
  • Solubility
  • Surface Properties

Substances

  • Polysaccharides, Bacterial
  • Diclofenac
  • gellan gum
  • Calcium Chloride