title: In-vitro dissolution profile comparison: statistics and analysis, model dependent approach.
abstract: OBJECTIVE
  To develop and propose a "model dependent' approach for the in-vitro dissolution profiles comparison.
  
  
  METHODS
  Diltiazem hydrochloride tablet dissolution profiles were compared using a statistical approach based on a mathematical model. A similarity region (SR) was defined based on the intra- and inter-lot parameter variances of the final production size standard lots. Statistical distances between the test and reference lot parameter means were computed and normalized. A 90% confidence region (CR) was developed around the statistical distance. The confidence region was compared with the similarity region to assess the similarity or dis-similarity of the test and reference (REF) lot dissolution profiles. Two test lots, one with a "minor' modification (mm) the other with a "major' modification (MM), were evaluated.
  
  
  RESULTS
  "Weibull' was selected as the "model' function. A comparison of the confidence regions around the statistical distance of "mm-REF' and "MM-REF' with the similarity region, suggested that the dissolution profiles of the "minor' modification lot were similar and that of "major' modification lot were dis-similar to the reference lot.
  
  
  CONCLUSIONS
  A "model dependent' approach was shown to be useful for the inter-lot in-vitro dissolution profiles comparison.
authors.affiliation: Office of Pharmaceutical Sciences, U.S. Food and Drug Administration, Rockville, Maryland 20855, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Sathe
authors.forename: Y
authors.initials: Y
authors.lastname: Tsong
authors.forename: V P
authors.initials: VP
authors.lastname: Shah
mesh_terms: D002317:Cardiovascular Agents / Q000737:chemistry*; D004110:Diltiazem / Q000737:chemistry*; D015233:Models, Statistical; D012995:Solubility; D013607:Tablets / Q000592:standards
chemical_list: D002317:Cardiovascular Agents; D013607:Tablets; D004110:Diltiazem