title: In-vitro and in-vivo correlation for two gliclazide extended-release tablets.
abstract: The aim of this study was to perform an in-vitro-in-vivo correlation (IVIVC) for two 60-mg gliclazide extended-release formulations (Fast and Slow release) given once a day and to compare their plasma concentrations over time. In-vitro release rate data were obtained for each formulation using the USP apparatus II, paddle stirrer at 50 and 100 rev min(-1) in 0.1 M HCl and pH 7.4 phosphate buffer. The similarity factor (f2) was used to analyse the dissolution data. Eighteen healthy subjects participated in the study, conducted according to a completely randomized, two-way crossover design. The formulations were compared using area under the plasma concentration-time curve, AUC(0-infinity), time to reach peak plasma concentration, Tmax, and peak plasma concentration Cmax, while correlation was determined between in-vitro release and in-vivo absorption. A linear correlation model was developed using percent absorbed data versus percent dissolved data from the two formulations. Predicted gliclazide concentrations were obtained by use of a curve fitting equation. Prediction errors were estimated for Cmax and area under the curve AUC(0-infinity) to determine the validity of the correlation. 0.1 M HCl at 50 rev min(-1) was found to be the most discriminating dissolution method. Linear regression analysis of the mean percentage of dose absorbed versus the mean percentage of in-vitro release resulted in a significant correlation (r2 > 0.98) for the two formulations. An average percent prediction error for Cmax was 4.15% for Fast release and 3.99% for Slow release formulation whereas for AUC(0-infinity) it was 6.36% and 4.66% for Fast release and Slow release formulation, respectively.
authors.affiliation: Bioequivalence Study Centre, Department of Pharmaceutical Technology, Jadavpur University, S. C. Mallick Road, Kolkata, West Bengal, 700 032, India.
authors.forename: U
authors.initials: U
authors.lastname: Mandal
authors.forename: K K
authors.initials: KK
authors.lastname: Ray
authors.forename: Veeran
authors.initials: V
authors.lastname: Gowda
authors.forename: A
authors.initials: A
authors.lastname: Ghosh
authors.forename: T K
authors.initials: TK
authors.lastname: Pal
mesh_terms: D019540:Area Under Curve; D001682:Biological Availability; D002626:Chemistry, Pharmaceutical; D018592:Cross-Over Studies; D003692:Delayed-Action Preparations; D005907:Gliclazide / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics*; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics*; D008297:Male; D008954:Models, Biological; D012044:Regression Analysis; D015203:Reproducibility of Results; D012995:Solubility; D013607:Tablets
chemical_list: D003692:Delayed-Action Preparations; D007004:Hypoglycemic Agents; D013607:Tablets; D005907:Gliclazide