title: Preparation and investigation the release behaviour of wax microspheres loaded with salicylic acid.
abstract: Salicylic acid-beeswax microspheres were prepared by melt dispersion technique. The effects of formulation parameters on the microscopic characteristic, drug loading and cumulative amount of released drug were investigated by experimental design. Results showed that all of the microparticles were spherical with porous surfaces. The average size of microspheres was 24-48 microm, the drug content was in the range of 22-45% and the encapsulation efficiency was 46-93%. Drug loading was influenced by emulsification speed as a main factor. All the microspheres had a burst release initially. The emulsifier concentration did not have a significant effect on drug release. The release behaviour of microspheres conformed best to Korsmeyer-Peppas semi-empirical model and the release of SA from beeswax microspheres was Fickian (n < 0.45).
authors.affiliation: Islamic Azad University, Science and Research Branch, Tehran, Iran. aida_gifani@yahoo.com
authors.forename: Aida
authors.initials: A
authors.lastname: Gifani
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Taghizadeh
authors.forename: Ali A
authors.initials: AA
authors.lastname: Seifkordi
authors.forename: Mehdi
authors.initials: M
authors.lastname: Ardjmand
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage*; D001516:Bees; D004337:Drug Carriers / Q000737:chemistry*; D004339:Drug Compounding; D008863:Microspheres; D010316:Particle Size; D016062:Porosity; D020156:Salicylic Acid / Q000008:administration & dosage*; D014885:Waxes / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D004337:Drug Carriers; D014885:Waxes; C038228:beeswax; D020156:Salicylic Acid