title: Metronidazole loaded pectin microspheres for colon targeting.
abstract: A multiparticulate system having pH-sensitive property and specific enzyme biodegradability for colon-targeted delivery of metronidazole was developed. Pectin microspheres were prepared using emulsion-dehydration technique. These microspheres were coated with Eudragit(R) S-100 using oil-in-oil solvent evaporation method. The SEM was used to characterize the surface of these microspheres and a distinct coating over microspheres could be seen. The in vitro drug release studies exhibited no drug release at gastric pH, however continuous release of drug was observed from the formulation at colonic pH. Further, the release of drug from formulation was found to be higher in the presence of rat caecal contents, indicating the effect of colonic enzymes on the pectin microspheres. The in vivo studies were also performed by assessing the drug concentration in various parts of the GIT at different time intervals which exhibited the potentiality of formulation for colon targeting. Hence, it can be concluded that Eudragit coated pectin microspheres can be used for the colon specific delivery of drug.
authors.affiliation: Department of Pharmaceutical Sciences, Dr. Hari Singh Gour Vishwavidyalaya, Sagar 470 003, Madhya Pradesh, India.
authors.forename: Ankur
authors.initials: A
authors.lastname: Vaidya
authors.forename: Aviral
authors.initials: A
authors.lastname: Jain
authors.forename: Piush
authors.initials: P
authors.lastname: Khare
authors.forename: Ram K
authors.initials: RK
authors.lastname: Agrawal
authors.forename: Sanjay K
authors.initials: SK
authors.lastname: Jain
mesh_terms: D000818:Animals; D000981:Antiprotozoal Agents / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics; D002432:Cecum / Q000378:metabolism / Q000382:microbiology; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003106:Colon / Q000378:metabolism*; D004337:Drug Carriers / Q000737:chemistry; D016503:Drug Delivery Systems / Q000379:methods; D005079:Excipients / Q000737:chemistry; D005766:Gastrointestinal Contents / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008795:Metronidazole / Q000008:administration & dosage* / Q000737:chemistry* / Q000493:pharmacokinetics; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D010316:Particle Size; D010368:Pectins / Q000737:chemistry*; D051381:Rats
chemical_list: D000981:Antiprotozoal Agents; D020099:Coated Materials, Biocompatible; D004337:Drug Carriers; D005079:Excipients; D008795:Metronidazole; D010368:Pectins