Browsing by Author "Tapia, A. E."
Now showing items 1-4 of 4
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Toral, A. E.; Tapia, A. E.; Richter Duk, Pablo; Fuenzalida, Emely (ROYAL SOC CHEMISTRY, 1997-10)A flow injection photometric method for the sequential determination of zinc and copper in mixtures was developed based on the variation of the stability of the chromogenic complexes between the analytes and the reagent ...
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Simultaneous determination of ascorbic acid and acetylsalicylic acid in pharmaceutical formulations Toral Ponce, María; Lara Henríquez, Nelson; Richter Duk, Pablo; Tassara, Andrés; Tapia, A. E.; Rodríguez, C. (AOAC INTERNATIONAL, 2001-02)A direct, simple, and practical first-derivative spectrophotometric method is described for simultaneous determination of ascorbic acid and acetylsalicylic acid. The effects of the solvent, excipients, and spectral variables ...
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Toral Ponce, María; Soto Salazar, César; Richter Duk, Pablo; Tapia, A. E. (AOAC INTERNATIONAL, 2002-07)This paper reports a simple and fast method for the simultaneous determination of estradiol (ED) and medroxyprogesterone acetate (MP) in pharmaceutical formulations by second-derivative spectrophotometry. Methanol was used ...
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Toral Ponce, María; Lara Henríquez, Nelson; Tapia, A. E.; Torres, C.; Richter Duk, Pablo (SOCIEDAD CHILENA DE QUIMICA, 2002-09)A direct and simple second derivative digital spectrophometric method has been developed for the simultaneous determination of the sulfamethoxazole and trimethoprim in pharmaceutical formulation. A study of the spectral ...