Browsing by Author "Abdelkawy, Mohammad"

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    New developed spectrophotometric method for simultaneous determination of salmeterol xinafoate and fluticasone propionate in bulk powder and Seritide® diskus inhalation
    (Elsevier, 2012) Samir, Ahmed; Salem, Hesham; Abdelkawy, Mohammad
    A new simple, accurate, precise, rapid and economical method was developed for the simultaneous determination of Salmeterol xinafoate and Fluticasone propionate in their binary mixture in bulk powder and Seritide diskus® inhalation. The new method depends on new calculations using the mixture’s absorbance at 225 and 256.5 nm where the absorptivity of Salmeterol xinafoate is double the absorptivity of Fluticasone propionate, while the content of Salmeterol xinafoate was determined by measuring the absolute value of the first derivative ultraviolet curves at 352 nm, without interference from Fluticasone propionate. The proposed method was validated and the results obtained by adopting the proposed method were statistically analyzed and compared with those obtained by reported methods.
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    Simultaneous Determination of Salmeterol Xinafoate and Fluticasone Propionate in Bulk Powder and Seritide Diskus using High Performance Liquid Chromatographic and Spectrophotometric Method
    (Pharmaceutica Analytica Acta, 2012) Samir, Ahmed; Salem, Hesham; Abdelkawy, Mohammad
    Five methods were developed for simultaneous determination of Salmeterol xinafoate (SAM) and Fluticasone propionate (FLU) without previous separation. In the first method (HPLC), a reversed-phase column and a mobile phase of acetonitrile: methanol (80:20 v/v) at 0.5 mLmin-1 flow rate was used to separate both drugs and UV detection at 220 nm. Linearity was obtained in concentration ranges of 50-500 µgmL-1 for Salmeterol xinafoate Fluticasone propionate. In the second method both drugs were determined using first derivative UV spectrophotometry, with zero crossing measurement at 352 and 269.5 nm for Salmeterol xinafoate and Fluticasone propionate, respectively. The third method depends on first derivative of the ratios spectra by measurements of the amplitudes at 334 and 337.5 nm for Salmeterol xinafoate and at 225 and 231.5 nm for Fluticasone propionate. Calibration graphs were established in the range of 4-28 µgmL-1 for both Salmeterol xinafoate and Fluticasone propionate. The fourth one depend on isosbestic point at 237.5 nm, while the content of Salmeterol xinafoate was determined by measuring the absolute value of the ultraviolet curves at 343 nm, without interference from Fluticasone propionate. All the proposed methods were extensively validated. They have the advantage of being economic and time saving. All the described methods can be readily utilized for the analysis of pharmaceutical formulations. The results obtained by adopting the proposed methods were statistically analyzed and compared with those obtained by official methods.