Buscar
Mostrando ítems 21-30 de 118
Chemometrics-assisted cyclodextrin-enhanced excitation-emission fluorescence spectroscopy for the simultaneous green determination of bisphenol A and nonylphenol in plastics
(Elsevier Science, 2015-06)
Abstract The aim of this work was to quantify two relevant priority chemicals, bisphenol A (BPA) and 4-nonylphenol (NP), coupling the sensitivity of fluorescence in organized media and the selectivity of multivariate ...
Técnicas espectroscopias e quimiométricas como ferramentas na confirmação da estrutura de substâncias isoladas de produtos naturais ou obtidas por síntese
(2011)
A elucidação estrutural de substâncias orgânicas é feita, atualmente, mediante o uso de diversas técnicas espectroscópicas, tais como a ressonância magnética nuclear (RMN de 1H, 13C, DEPT, HMBC, HMQC, TOCSY, dentre outras), ...
Novel spectrofluorimetric method for boldine alkaloid determination in herbal drugs and phytopharmaceuticals
(Pergamon-Elsevier Science Ltd, 2017-04-21)
A new green on-line method for Boldine determination (BOL) in herbal drugs andphytopharmaceuticals, using its native fluorescence in acid media (λex = 282 nm; λem = 373 nm) has been developed. The presented methodology ...
Flow injection spectrofluorimetric determination of carvedilol mediated by micelles
(Elsevier Science, 2008-06)
A novel flow injection (FI)-spectrofluorimetric methodology for the determination of carvedilol in microheterogeneous medium has been developed. In the sodium dodecyl sulfate (SDS) surfactant medium, an additional fluorescence ...
High-performance liquid chromatography with fast-scanning fluorescence detection and multivariate curve resolution for the efficient determination of galantamine and its main metabolites in serum
(Elsevier Science, 2012-06)
Based on green analytical chemistry principles, an efficient approach was applied for the simultaneous determination of galantamine, a widely used cholinesterase inhibitor for the treatment of Alzheimer's disease, and its ...
A novel application of immobilization on membranes for the separation and spectrofluorimetric quantification of amiloride and furosemide in pharmaceutical samples
(Elsevier Science, 2010-02-21)
A new, simple and highly sensitive method for spectrofluorimetric determination of amiloride (AMI) and furosemide (FUR) in pharmaceuticals is presented. The proposed method is based on the separation of AMI from FUR by ...
Micelles mediated separation fluorimetric methodology for Rhodamine B determination in condiments, snacks and candies
(Elsevier, 2012-09)
Dye Rhodamine B (RhB) has been widely used in textile industry and foodstuffs but due to its proved carcinogenicity and toxicity on human, many countries have forbidden its use in foods. A new methodology is proposed for ...