The relationship of angle of slide with corresponding of Avicel, Fujicalin, Neusilin, and Co of Aerosil for Acrysol EL 135 liquid vehicle are shown in Figures 2(a), 2(b), and 2(c), respectively. The Ca and Co for liquid vehicles were used to calculate Lf. The Lf was then used to decide the optimum amount of carrier and coating materials required to ensure dry-looking, free-flowing and compactible powdered systems. The lowest liquid factor was obtained for Avicel PH 102, and accordingly, the amount of carrier
was higher than other formulations. The highest liquid factor was obtained for Inhibitors,research,lifescience,medical Neusilin, and accordingly, the amount of carrier was lower than other formulations. Figure 2 (a) The angle of slide of Avicel and Aerosil with Acrysol EL 135. (b) The angle of slide of Fujicalin
and Aerosil with Acrysol EL 135. (c) The angle of slide Inhibitors,research,lifescience,medical of Neusilin and Aerosil with Acrysol EL 135. 3.3. Precompression Studies (Characterization of Powder Admixtures) Powder flowability is crucial in the industrial production of tablet dosage forms, as a uniform powder stream through Inhibitors,research,lifescience,medical hopper confirms uniformity of both tablet weight and drug content. The results of various flow parameters are shown in Table 3. Formulations containing Fujicalin and Neusilin showed Rucaparib research buy improved flowability in comparison to Avicel PH 102. Formulations containing R = 15 showed good flowability than formulations containing Inhibitors,research,lifescience,medical R = 5. This could be probably due to the presence of higher amounts of silica in R = 5 and lower in R = 15. Aerosil is known to be hydrophobic in nature, which retards the flow properties. At higher R values the greater amount of carrier may overcome to some extent the flow properties of powder. Table 3 Characterization of powder mixtures. 3.4. Differential Scanning Calorimetry (DSC) DSC was used for the investigation of any interaction between the drug and its excipients. Inhibitors,research,lifescience,medical Figures 3(a) and 3(b) show the thermogram for olmesartan medoxomil and liquisolid mixture.The thermogram showed a sharp endothermic peak at Tm of
189.81°C corresponding to its melting point. For liquisolid mixture, the endothermic peak of the drug completely disappeared indicating that the drug is completely solubilized and molecularly dispersed with excipients within liquisolid system. This would explain the improved drug because dissolution from liquisolid compared to conventional preparations. Figure 3 (a) Thermogram of olmesartan medoxomil. (b) Thermogram of liquisolid mixture. 3.5. Fourier Transform Infrared Spectroscopy IR spectrum of pure Olmesartan medoxomil shown in Figure 4(a), an absorption band was observed, peaks 2995.87cm−1 (C-H, str, Sp2), 2923.56cm−1 (C-H, str, Sp3), 1708cm−1, 1832cm−1 (C-O, str) and 3300–3100cm−1 (N-H, str).
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