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Simultaneous determination of dapsone and pyrimethamine by derivative spectrophotometry in pharmaceutical formulations
(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 ...
A novel dispersive liquid-liquid microextraction using a low density deep eutectic solvent-gas chromatography tandem mass spectrometry for the determination of polycyclic aromatic hydrocarbons in soft drinks
(2021-01-04)
Ready-to-drink teas can provide, if properly packaged, the taste and wellness character of traditional teas. Nevertheless, in tea processing, there may be several contaminations, among which polycyclic aromatic hydrocarbons ...
Simple method for determination of cocaine and main metabolites in urine by CE coupled to MS
(WILEY-V C H VERLAG GMBH, 2009)
in this work, a simple method for the simultaneous determination of cocaine (COC) and five COC metabolites (benzoylecgonine, cocaethylene (CET), anhydroecgonine, anhydroecgonine methyl ester and ecgonine methyl ester) in ...
Shrinkage Bubbles: The C-O-H-S Magmatic Fluid System at San Cristobal Volcano
(OXFORD UNIV PRESS, 2018)
New analytical results for the composition of shrinkage bubbles (0.9-7.0 vol. %) in olivine-hosted (Fo <80%) primary melt inclusions (MIs) have been incorporated into a novel geochemical model for San Cristobal volcano, ...
Different analytical methodologies for the preconcentration and determination of trace chromium by XRF in medicinal herbs with effects on metabolism
(John Wiley & Sons Ltd, 2002-03)
The essentiality of chromium and the disturbances that its deficiency produces in humans are of interest, have the detection and determination of chromium in drugs of vegetable origin used in phytotherapy are of great ...
Pilot plant scale extraction of alginates from Macrocystis pyrifera. 4. Conversion of alginic acid to sodium alginate, drying and milling
(Journal of Applied Phycology, 2002)
The last three steps of the alginate production process were studied:conversion of alginic acid to sodium alginate, drying, and milling. Threemethods were used to follow the conversion reaction: measuring the pH (a) ...