title: Possible mechanism for drug retardation from glyceryl monostearate matrix system.
abstract: Lipophilicity was evaluated as a possible mechanism for drug retardation from a glyceryl monostearate matrix system. Lipophilicity of the glyceryl monostearate matrix system was studied using contact angle measurement of water droplets on the surface of compressed disks, extrudate ascension of water, and movement of water through a powder mixture packed in a high-performance liquid chromatographic (HPLC) column. Increase in glyceryl monostearate content resulted in an increase in water droplet contact angle, decrease in the rate of water ascending the extrudate, and increase in the pressure values as a function of flow rate of water moving through the powder mixture. These could be due to the increase in lipophilicity of the matrix, rendering the matrix less wettable. As a result, the rate of water penetration into the matrix decreased, and the drug release could be sustained.
authors.affiliation: School of Pharmaceutical Sciences, University of Science Malaysia, Penang, Malaysia. kkpeh@usm.my
authors.forename: K K
authors.initials: KK
authors.lastname: Peh
authors.forename: C F
authors.initials: CF
authors.lastname: Wong
authors.forename: K H
authors.initials: KH
authors.lastname: Yuen
mesh_terms: D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid; D003692:Delayed-Action Preparations; D005989:Glycerides / Q000737:chemistry / Q000493:pharmacokinetics*; D011208:Powders; D014867:Water
chemical_list: D003692:Delayed-Action Preparations; D005989:Glycerides; D011208:Powders; D014867:Water; C048159:glyceryl monostearate