title: Development of Floating-Mucoadhesive Microsphere for Site Specific Release of Metronidazole.
abstract: OBJECTIVE
  The purpose of this study was to develop and evaluate metronidazole loaded floating-mucoadhesive microsphere for sustained drug release at the gastric mucosa.
  
  
  METHODS
  Alginate gastroretentive microspheres containing metronidazole were prepared by ionic gelation method using sodium bicarbonate as gas forming agent, guar gum as mucoadhesive polymer, and Eudragit L100 as drug release modifier. Carbopol was used for increasing the bead strength. The microspheres were characterized by scanning electron microscopy and evaluated by means of drug entrapment efficiency, in vitro buoyancy, and swelling studies. In vitro mucoadhesion and drug release studies were carried out in order to evaluate site specific sustained drug release.
  
  
  RESULTS
  All formulations showed 100% buoyancy in vitro for a prolonged period of time. Amount of guar gum influenced the properties of different formulations. The formulation containing drug and guar gum at a ratio of 1:0.5 showed the best results with 76.3% drug entrapment efficiency, 61.21% mucoadhesion, and sustained drug release. Carbopol was found to increase surface smoothness of the microspheres.
  
  
  CONCLUSIONS
  Metronidazole mucoadhesive-floating microspheres can be effectively used for sustained drug release to the gastric mucosa in treatment of upper GIT infection.
authors.affiliation: Department of Pharmacy, Stamford University Bangladesh.
authors.forename: Md Lutful
authors.initials: ML
authors.lastname: Amin
authors.affiliation: Department of Pharmacy, Stamford University Bangladesh.
authors.forename: Tajnin
authors.initials: T
authors.lastname: Ahmed
authors.affiliation: Department of Pharmacy, Stamford University Bangladesh.
authors.forename: Md Abdul
authors.initials: MA
authors.lastname: Mannan
keywords: Alginate; Eudragit; Floating microsphere; Guar gum; Metronidazole; Mucoadhesive microsphere