title: Chitosan/calcium alginate microcapsules for intestinal delivery of nitrofurantoin.
abstract: A new sustained-release dosage form of nitrofurantoin (NF) as microcapsules has been prepared by a mild chitosan/calcium alginate microencapsulation process. These microcapsules have been prepared by adding, dropwise, a solution of sodium alginate containing NF into a chitosan-CaCl(2) system. About 70-80% of the drug is released into phosphate buffer, pH = 7.4 within 6 h. Drug release into the gastric medium is found to be relatively slow compared to that into the intestinal medium. From scanning electron microscopic studies, it appears that the chitosan modifies the NF-alginate microspheres. These findings suggest the possibility of modifying the formulation to obtain the controlled release of NF in an oral sustained-delivery system.
authors.affiliation: Biosurface Technology Division, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Poojappura, India.
authors.forename: P R
authors.initials: PR
authors.lastname: Hari
authors.forename: T
authors.initials: T
authors.lastname: Chandy
authors.forename: C P
authors.initials: CP
authors.lastname: Sharma
mesh_terms: D000284:Administration, Oral; D000464:Alginates / Q000378:metabolism*; D000892:Anti-Infective Agents, Urinary / Q000378:metabolism / Q000494:pharmacology; D002214:Capsules / Q000737:chemistry* / Q000378:metabolism; D002686:Chitin / Q000031:analogs & derivatives* / Q000378:metabolism; D048271:Chitosan; D003692:Delayed-Action Preparations / Q000737:chemistry / Q000378:metabolism; D004337:Drug Carriers / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D009582:Nitrofurantoin / Q000378:metabolism*
chemical_list: D000464:Alginates; D000892:Anti-Infective Agents, Urinary; D002214:Capsules; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D002686:Chitin; D048271:Chitosan; D009582:Nitrofurantoin