title: Drug release properties of a gel bead prepared with pectin and hydrolysate.
abstract: A calcium-induced pectin gel bead (PB) containing pectin hydrolysate was prepared, and the drug release profiles and degradation properties of the PB were investigated in aqueous media. The stiff PB swelled in physiological saline and its drug release rate decreased with exposure to increasing concentrations of CaCl2 during preparation. And erosion of the PB was not observed in physiological saline. However, the PB did disintegrate in phosphate buffer (pH 6.8) and the rate of disintegration depended on the calcium chloride concentration used to prepare the PB. In addition, the drug release rate of the PB in buffer solution decreased as the rate of gel erosion declined. Consequently, it appears that the PB gel matrix is an effective medium by which to control the release of drug within the gastrointestinal tract.
authors.affiliation: Faculty of Pharmaceutical Science, Hokuriku University, Ho-3, Kanagawa-machi, Kanazawa 920-1181, Japan. y-murata@hokuriku-u.ac.jp
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Murata
authors.forename: Michiko
authors.initials: M
authors.lastname: Miyashita
authors.forename: Kyouko
authors.initials: K
authors.lastname: Kofuji
authors.forename: Etsuko
authors.initials: E
authors.lastname: Miyamoto
authors.forename: Susumu
authors.initials: S
authors.lastname: Kawashima
mesh_terms: D002122:Calcium Chloride / Q000032:analysis; D002850:Chromatography, Gel; D003692:Delayed-Action Preparations; D005079:Excipients; D005782:Gels; D006868:Hydrolysis; D007700:Kinetics; D008863:Microspheres; D010316:Particle Size; D010368:Pectins / Q000737:chemistry*; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet; D014783:Viscosity
chemical_list: D003692:Delayed-Action Preparations; D005079:Excipients; D005782:Gels; D010368:Pectins; D002122:Calcium Chloride