title: Synthesis of chemically cross-linked hydroxypropyl methyl cellulose hydrogels and their application in controlled release of 5-amino salicylic acid.
abstract: The objective of this study was to achieve the colon-specific delivery of an anti-ulcerative colitis drug using hydroxypropyl methyl cellulose (HPMC) hydrogels. HPMC hydrogels containing poly ethylene glycol (PEG) as cross-links have been prepared by reacting HPMC sodium salt with polyethylene glycol dichloride. The effect of cross-linking agent on swelling behavior of HPMC-PEG hydrogels, were investigated. Swelling parameters such as equilibrium degree of swelling, swelling ratio and network parameter such as molecular mass between cross-links (M(c)) were determined. The cross-linking concentrations were 0.5%, 1%, 1.5%, and 2% (based on weight of HPMC). The equilibrium swelling ratio (Q) of cross-linked HPMC hydrogels increases from 13.2 to 27.1 as the cross-linker percentage increases from 0.5% to 2%. 5-Aminosalicylic acid (5-ASA) was used as a model of an anti-inflammatory drug. Cross-linked HPMC hydrogels were found to be a promising drug delivery system for the drugs to be delivered to the colon.
authors.affiliation: Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Science, Tabriz, Iran. davaran@tbzmed.ac.ir
authors.forename: Soodabeh
authors.initials: S
authors.lastname: Davaran
authors.forename: Mohammad R
authors.initials: MR
authors.lastname: Rashidi
authors.forename: Abbas
authors.initials: A
authors.lastname: Khani
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000737:chemistry*; D003106:Colon; D003432:Cross-Linking Reagents / Q000737:chemistry*; D003692:Delayed-Action Preparations; D016503:Drug Delivery Systems; D020100:Hydrogels / Q000138:chemical synthesis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D065347:Hypromellose Derivatives; D019804:Mesalamine / Q000008:administration & dosage / Q000737:chemistry*; D008747:Methylcellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols / Q000737:chemistry*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D020100:Hydrogels; D065347:Hypromellose Derivatives; D011092:Polyethylene Glycols; D019804:Mesalamine; D008747:Methylcellulose