title: Impact of salt form and molecular weight of chitosan on swelling and drug release from chitosan matrix tablets.
abstract: Magnetic resonance imaging (MRI) and gravimetric techniques were used to assess swelling and erosion behaviors of hydrophilic matrix tablets made of chitosan. The impact of salt form, molecular weight (MW) and dissolution medium on swelling behavior and drug (theophylline) release was studied. The matrix tablets made of chitosan glycolate (CGY) showed the greatest swelling in both acid and neutral media, compared to chitosan aspartate, chitosan glutamate and chitosan lactate. MRI illustrated that swelling region of CGY in both media was not different in the first 100 min but glassy region (dry core) in 0.1N HCl was less than in pH 6.8 buffer. The tablets prepared from chitosan with high MW swelled greater than those of low MW. Moreover, CGY can delay drug release in the acid condition due to thick swollen gel and low erosion rate. Therefore, CGY may be suitably applied as sustained drug release polymer or enteric coating material.
authors.affiliation: Faculty of Pharmaceutical Science, Burapha University, Chonburi 20131, Thailand.
authors.forename: Kampanart
authors.initials: K
authors.lastname: Huanbutta
authors.forename: Kamonrak
authors.initials: K
authors.lastname: Cheewatanakornkool
authors.forename: Katsuhide
authors.initials: K
authors.lastname: Terada
authors.forename: Jurairat
authors.initials: J
authors.lastname: Nunthanid
authors.forename: Pornsak
authors.initials: P
authors.lastname: Sriamornsak
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008970:Molecular Weight; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D012492:Salts / Q000737:chemistry*; D013607:Tablets / Q000737:chemistry
chemical_list: D004364:Pharmaceutical Preparations; D012492:Salts; D013607:Tablets; D048271:Chitosan