title: Investigations on prolonged release of vitamin C formulations.
abstract: In this study, investigations have been carried out to prepare prolonged release formulations of ascorbic acid in order to obtain a more effective dissolution profile of the drug. For the preparation of micropellets, the fluid bed method was chosen and to obtain prolonged effect, aqueous dispersions of Eudragit S, L and their mixtures were used. After setting the parameters of fluid bed, micropellets were produced using different coating dispersions. Following the production process, morphology, friability, particle size distribution, flow properties, bulk density and dissolution tests were carried out on the micropellets. The most appropriate formulation for our aim was chosen according to these tests.
authors.affiliation: Ankara University, Faculty of Pharmacy, Department of Pharmaceutical Technology, 06100-Tandoğan - Ankara - Turkey.
authors.forename: K
authors.initials: K
authors.lastname: Canefe
authors.forename: F
authors.initials: F
authors.lastname: Kayseriloğlu
mesh_terms: D000975:Antioxidants / Q000008:administration & dosage*; D001205:Ascorbic Acid / Q000008:administration & dosage*; D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations; D005079:Excipients; D007202:Indicators and Reagents; D010316:Particle Size; D011109:Polymethacrylic Acids
chemical_list: D000975:Antioxidants; D003692:Delayed-Action Preparations; D005079:Excipients; D007202:Indicators and Reagents; D011109:Polymethacrylic Acids; C038300:methylmethacrylate-methacrylic acid copolymer; D001205:Ascorbic Acid