The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Dissolution of different commercial aspirin tablets using a novel off-center paddle impeller (OPI) dissolution testing system
Author:	Qu, Yang
View Online:	njit-etd2013-041 (xii, 66 pages ~ 1.5 MB pdf)
Department:	Department of Chemical, Biological and Pharmaceutical Engineering
Degree:	Master of Science
Program:	Pharmaceutical Engineering
Document Type:	Thesis
Advisory Committee:	Armenante, Piero M. (Committee chair) Simon, Laurent (Committee member) Bredael, Gerard (Committee member)
Date:	2013-05
Keywords:	Dissolution testing Off-center paddle impeller Modified dissolution testing apparatus 2
Availability:	Unrestricted
Abstract:	Dissolution testing is routinely conducted in the pharmaceutical industry to provide in vitro drug release information for quality control purposes. The most common dissolution testing system for solid dosage forms is the United States Pharmacopeia (USP) Dissolution Testing Apparatus 2. In this work, a modified Apparatus 2, termed "OPI" System for "off-center paddle impeller," in which the impeller is placed 8 mm off center in the vessel is tested to determine its sensitivity to differentiate between the dissolution profiles of differently formulated and manufactured tablets. Dissolution tests are conducted with both the OPI System and the Standard System using three different brands of aspirin at nine different tablet positions. The OPI system produces dissolution profiles that are highly dependent on the different brands of aspirin used, similarly to those generates in the Standard System. However, the dissolution profiles obtained with the OPI apparatus are found to be largely independent of the tablet location at the vessel bottom, whereas those obtained in the Standard System generates statistically different profiles depending on tablet location. It can be concluded that the newly proposed OPI system can effectively eliminate artifacts generated by random settling of the tablet at the vessel bottom, thus making the test more robust, while at the same time being just as sensitive as the Standard System to actual differences in differently manufactured tablets having intrinsically different dissolution profiles.