title: Polymers with pH-dependent solubility: possibility of use in the formulation of gastroresistant and controlled-release matrix tablets.
abstract: Polymers usually utilized for gastroresistant film coating of tablets or pellets such as cellulose acetate phthalate (CAP), cellulose acetate trimellitate (CAT), hydroxypropylmethylcellulose phthalate (HPMCP), and Eudragit L and S were used in the preparation of drug/polymer matrix tablets. These tablets were prepared either by direct compression of both powders or by the formulation of microspheres that were then compressed. The microspheres were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and X-ray diffractometry analyses. Dissolution studies were finally carried out to verify if the tablets possessed gastroresistant or controlled-release characteristics. Except for Eudragit L, the polymers can be used under certain conditions in the formulation of modified-release tablets.
authors.affiliation: Università di Camerino, Dipartimento di Scienze Chimiche, Italy.
authors.forename: G F
authors.initials: GF
authors.lastname: Palmieri
authors.forename: S
authors.initials: S
authors.lastname: Michelini
authors.forename: P
authors.initials: P
authors.lastname: Di Martino
authors.forename: S
authors.initials: S
authors.lastname: Martelli
mesh_terms: D000082:Acetaminophen / Q000737:chemistry / Q000493:pharmacokinetics*; D000180:Acrylic Resins / Q000737:chemistry / Q000493:pharmacokinetics*; D018712:Analgesics, Non-Narcotic / Q000737:chemistry / Q000493:pharmacokinetics*; D002214:Capsules; D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations; D005744:Gastric Acid / Q000378:metabolism; D005782:Gels; D006863:Hydrogen-Ion Concentration; D011108:Polymers; D011109:Polymethacrylic Acids; D012995:Solubility; D013607:Tablets
chemical_list: D000180:Acrylic Resins; D018712:Analgesics, Non-Narcotic; D002214:Capsules; D003692:Delayed-Action Preparations; D005782:Gels; D011108:Polymers; D011109:Polymethacrylic Acids; D013607:Tablets; C038300:methylmethacrylate-methacrylic acid copolymer; D000082:Acetaminophen