To study the mechanism of drug release from the matrix tablets, the release data were fitted to zero-order, first-order, and Higuchi equations. The dissolution data were also fitted to the well- known Korsmeyer exponential equation, which is often used to describe drug release behavior from polymeric systems. ( ) LogknLogt MMLog tf + = …………………………………. (3)
The diffusional exponent “n”, which is indicative of the mechanism of drug release, was obtained by plotting the log value of percent drug released against log time for each batch according to Eq 3. A value of n = 0.45 indicates Fickian (case I) release; > 0.45 but < 0.89 is non-Fickian (anomalous) release; and > 0.89 indicates super case II type of release. Case II generally refers to the erosion of the polymeric chain and anomalous transport (non-Fickian) refers to a combination of both diffusion and erosion controlled-drug release.
To study the mechanism of drug release from the matrix tablets, the release data were fitted to zero-order, first-order, and Higuchi equations. The dissolution data were also fitted to the well- known Korsmeyer exponential equation, which is often used to describe drug release behavior from polymeric systems. ( ) LogknLogt MMLog tf + = …………………………………. (3)
The diffusional exponent “n”, which is indicative of the mechanism of drug release, was obtained by plotting the log value of percent drug released against log time for each batch according to Eq 3. A value of n = 0.45 indicates Fickian (case I) release; > 0.45 but < 0.89 is non-Fickian (anomalous) release; and > 0.89 indicates super case II type of release. Case II generally refers to the erosion of the polymeric chain and anomalous transport (non-Fickian) refers to a combination of both diffusion and erosion controlled-drug release.
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