Browsing by Author "Toral Ponce, María"
Now showing items 21-32 of 32
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Toral Ponce, María; Tassara, Andrés; Soto Salazar, César; Richter Duk, Pablo (AOAC INTERNATIONAL, 2003-03)A simple and fast method was developed for the simultaneous determination of dapsone and pyrimethamine by first-order digital derivative spectrophotometry. Acetonitrile was used as a solvent to extract the drugs from the ...
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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; Gómez, J.; Richter Duk, Pablo (MARCEL DEKKER INC, 2002)A simultaneous microdetermination of iron and copper at sub-mug/L level by solid phase derivative spectrophotometry has been developed. The compounds TPTZ (2,4,6-tripyridyl-,3,5-triazine) and Neocuproine (2,9-dimethyl-1, ...
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Toral Ponce, María; Paipa Gómez, Carolina; Narváez, Jessica; Richter Duk, Pablo (ELSEVIER SCIENCE BV, 2002-12)A new method for the simultaneous determination of iron and ruthenium at ultra-trace levels is proposed. The method is based on the formation of the iron and ruthenium complexes with 2,4,6-tri-(2-pyridil)-1,3,5-triazine ...
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Toral Ponce, María; Beattie, Alejandra; Santibáñez, Claudia; Richter Duk, Pablo (KLUWER ACADEMIC PUBL, 2002-06)A first derivative spectrophotometric method has been developed for the determination of parathion and p-nitrophenol in vegetable tissues. Ethanol was used as solvent for extracting the compounds from the tissues and ...
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Richter Duk, Pablo; Toral Ponce, María; Manríquez, Roberto (Sociedad Chilena de Química, 1999)En este trabajo se propone un método para determinar cobre a bajos niveles de concentración empleando una configuración de flujo continuo que permite la automatización de la etapa de extracción líquido-líquido, mediante ...
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Jaque, Pablo; Toral Ponce, María; Richter Duk, Pablo (Sociedad Chilena de Química, 1998)En este trabajo se desarrolla un método de análisis por inyección de flujo (FIA) para la determinación de ranitidina en formas farmacéuticas y orina, empleando una celda de flujo polarográfica como sistema de detección, ...
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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 ...
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Richter Duk, Pablo; Toral Ponce, María; Toledo, Carla (AOAC INTERNATIONAL, 2006-04)A rapid and simple continuous method for the extraction of nifedipine from tablets was developed by using pressurized hot water at 150 degrees C. This is the first time that subcritical water was applied to the extraction ...
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Morales, A.; Richter Duk, Pablo; Toral Ponce, María (Royal Society of Chemistry, 1987)In piridine - formic acid buffer and tetramethylammonium chloride solution of pH 4.5 at a dropping mercury or a glassy carbon electrode, nitrofurazone, furazolidone and nitrofurantoin are reduced in a single six-electron ...
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Carrera, M. E.; Rodríguez, V.; Toral Ponce, María; Richter Duk, Pablo (Marcel Dekker, Inc, 1993)This paper describes a method for the quantitative determination of aluminium in haemodialysis concentrates, based on the adsorption on a static mercury drop electrode of the Al-1,2 dihydroxyantraquinone-3-sulphonic acid ...
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Morales, Alfonso; Toral Ponce, María; Richter Duk, Pablo; Silva, Marcello (1992)A solvent extraction-spectrophotometric determination of trace amounts of ruthenium has been developed, based on the formation of an ion association complex of ruthenium (III) with 2,4,6-tris(2'-pyridyl)-1,3,5-triazine as ...