Abstract
The compendial method of evaluation of orodispersible tablets (ODT) is the same disintegration test as for conventional tablets. Since it does not reflect the disintegration process in the oral cavity, alternative methods are proposed that are more related to in vivo conditions, e.g. modified dissolution paddle apparatus, texture analyzer, rotating shaft apparatus, CCD camera application, or wetting time and water absorption ratio measurement. In this study, three different co-processed excipients for direct compression of orally disintegrating tablets were compared (Ludiflash, Pharmaburst, F-Melt). The properties of the prepared tablets such as tensile strength, friability, wetting time and water absorption ratio were evaluated. Disintegration time was measured using the pharmacopoeial method and the novel apparatus constructed by the authors. The apparatus was based on the idea of Narazaki et al., however it has been modified. Magnetic resonance imaging (MRI) was applied for the analysis of the disintegration mechanism of prepared tablets. The research has shown the significant effect of excipients, compression force, temperature, volume and kind of medium on the disintegration process. The novel apparatus features better correlation of disintegration time with in vivo results (R2 = 0.9999) than the compendial method (R2 = 0.5788), and presents additional information on the disintegration process, e.g. swelling properties.
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