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Reduced fluoresceinamine as a fluorescent sensor for nitric oxide
Duarte, Abel J.; Silva, Joaquim C. G. Esteves daA new fluorescent sensor for nitric oxide (NO) is presented that is based on its reaction with a non fluorescent substance, reduced fluoresceinamine, producing the highly fluorescent fluoresceinamine. Using a portable homemade stabilized light source consisting of 450 nm LED and fiber optics to guide the light, the sensor responds linearly within seconds in the NO concentration range between about 10–750 µM wit...
Factorial analysis optimization of a Diltiazem kinetic spectrophotometric quant...
Leitão, João M. M.; Silva, Joaquim C. G. Esteves daA Diltiazem kinetic spectrophotometric method was optimized by factorial analysis. The experimental method is based on a two-stage reaction of Diltiazem with hydroxylamine and a ferric salt: in the first stage there is a hydroxamic acid formation; and, in the second stage there is a red colour complex ferric hydroxamate formation. The variables under investigation were: solvent; hydroxylamine, sodium hydroxide ...
PARAFAC2 and MCR-ALS quantification of Diltiazem antihypertensor based on a kin...
Leitão, João M. M.; Silva, Joaquim C. G. Esteves daA Diltiazem kinetic spectrophotometric UV-Vis method, based on a reaction of the Diltiazem with hidroxylamine and a ferric salt, was used for the quantification of Diltiazem in different pharmaceutical formulations. This method is based on the acquisition of three-way data structures [wavelength (nm) × time (s) × concentration (mg/L)] followed by chemometric analysis by an appropriate PARAFAC2 or MCR-ALS second...
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