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A simple and sensitive spectrophotometric method has been developed for the determination of sparfloxacin in bulk and pharmaceutical
formulations, and in artificial urine. Sparfloxacin was oxidized into a red colored product using ammonium monovanadate in
acidic media. The proposed method was successfully applied to the determination of sparfloxacin in different pharmaceutical
formulations (tablets) and in a spiked urine sample. The influence of commonly used excipients on the determination of sparfloxacin
was studied. Percentage recoveries in the range of 98.0 ± 0.14 % to 100.0 ± 0.20 % were obtained. The observed data have been
evaluated statistically which showed high accuracy and precision. 相似文献
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Calculations [1] of rheological properties of polymeric solutions have usually been restricted to very dilute o r to very concentrated solutions. In either case, one starts with a model for the micro- structure. Between these two conceptual extremes lies the broad class of moderately concentrated solutions. To cover this region theoretically, two approaches have been used; 1) network theories focusing attention on entanglement junctions, and 2) single-molecule theories focusing attention on single molecules but including inter- molecular interactions. Williams, Wang, and Zimm introduced a double model; one for a particular macromolecule and another for solutions containing like molecules in which the chosen macro- molecule is suspended. This approach has turned out to be quite successful because spheres immersed in a suspension of like spheres behave as i f suspended in a Newtonian fluid, and the resulting ex- pression for viscosity is quite simple in form and qualitatively correct for moderate concentrations. 相似文献
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A simple, sensitive and accurate method has been developed for spectrofluorimetric determination of cefixime in pure form
and pharmaceutical preparations. The method is based on the reaction of cefixime with 2-cyanoacetamide in the presence of
21% ammonia at 100 °C. The fluorescent reaction product showed maximum fluorescence intensity at λ 378 nm after excitation
at λ 330 nm. The factors affecting the derivatization reaction were carefully studied and optimized. The fluorescence intensity
versus concentration plot was rectilinear over the range of 0.02 to 4 μg mL−1 with correlation coefficient of 0.99036. The limit of detection (LOD) and limit of quantification (LOQ) was found to be 2.95 ng mL−1 and 9.84 ng mL−1, respectively. The proposed method was validated statistically and through recovery studies. The method was successfully
applied for the determination of cefixime in pure and dosage form with percent recoveries from 98.117% to 100.38%. The results
obtained from the proposed method have been compared with the official HPLC method and good agreement was found between them. 相似文献
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