Lc Dad
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. ANALYSIS OF BENZODIAZEPINES IN PLASMA SAMPLES BY DLLME AND LC-DAD: CRITICAL ASPECTS, FLAWS AND ISSUES ENCOUNTERED - A DISCUSSION
Dispersive liquid-liquid microextraction (DLLME) is a fast and simple technique and applicable procedure for the analysis of xenobiotics in different biological matrices. We have developed a DLLME method for the determination of benzodiazepines in plasma samples using liquid chromatography-diode-array detection (LC-DAD). During method validation, relative st
Química Nova. Publicado em: 2022
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2. Bioactive Bioflavonoids from Platonia insignis (Bacuri) Residues as Added Value Compounds
Platonia insignis fruit, popularly known as bacuri, is traditionally used in folk medicine for its anti-inflammatory and antioxidant properties. Therefore, this study determined the chemical composition and biological activities of the bacuri’s shell and seeds extracts, considered residues from its consumption and industrial uses. Four biflavonoids (GB-2a,
J. Braz. Chem. Soc.. Publicado em: 2021-04
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3. Application of LC-DAD Metabolic Fingerprinting in Combination with PCA for Evaluation of Seasonality and Extraction Method on the Chemical Composition of Accessions from Lippia alba (Mill) N. E. Brown and Biological Activities
The methodology developed in this study through the acquisition of fingerprint chromatograms by liquid chromatography-diode array detector (LC-DAD), aided by principal component analysis, made it possible to assess, in a rational way, the chemical differences between six accessions of Lippia alba and to verify the influence of the method of extraction, the s
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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4. Quantification of major phenolic and flavonoid markers in forage crop Lolium multiflorum using HPLC-DAD
ABSTRACT The objective of this study was to perform preliminary screening of phytochemical compounds and quantification of major phenolics and flavonoid markers in Italian ryegrass extract using HPLC-DAD. Previously, LC–MS analysis has identified different phenolic acids, including caffeic acid, ferulic acid, p-coumaric acid, chlorogenic acid, dihydroxy be
Rev. bras. farmacogn.. Publicado em: 2018-06
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5. Artichoke edible parts are hepatoprotective as commercial leaf preparation
ABSTRACT Chemical profile analyses of artichoke (Cynara scolymus L., Asteraceae) edible parts (fleshy receptacle, inner bracts) as well as roots are compared with the commercially usable leaf extract using HPLC-DAD-ESI-MS via chlorogenicacid as a marker. Overall polyphenolic constituents demonstrated by means of LC/MS profiling. The nutritional values and in
Rev. bras. farmacogn.. Publicado em: 2018-04
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6. Secondary Metabolites from an Infusion of Lippia gracilis Schauer Using the LC-DAD-SPE/NMR Hyphenation Technique
The genus Lippia comprises approximately 200 species of herbs, shrubs and small trees, distributed throughout the South and Central America and tropical Africa. The species Lippia gracilis Schauer is an endemic aromatic plant of the Brazilian Northeast normally found in the states of Bahia, Sergipe and Piauí. The traditional communities of Caatinga, a semi-
J. Braz. Chem. Soc.. Publicado em: 2017-07
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7. A comparative study of two separate analytical techniques for the simultaneous determination of diclofenac sodium and diacerein from combined dosage form
ABSTRACT Diclofenac sodium (DS) and diacerein (DC) have emerged as a potential combination therapy for the treatment of knee osteoarthritis. Therefore a validated analytical method is essential for the simultaneous estimation of both from combined dosage form. A ratio derivative spectrophotometric and a chromatographic technique have been developed for the s
Braz. J. Pharm. Sci.. Publicado em: 22/06/2017
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8. Determination of Parabens in Surface Water from Mogi Guaçu River (São Paulo, Brazil) Using Dispersive Liquid-Liquid Microextraction Based on Low Density Solvent and LC-DAD
A method using dispersive liquid-liquid microextraction (DLLME) based on low density solvent (LDS) combined with liquid chromatography with diode array detection (LC-DAD) has been developed for determination of parabens. Some DLLME parameters such as kind and volumes of extraction and disperser solvents, pH of the aqueous samples, ionic strength, extraction,
J. Braz. Chem. Soc.. Publicado em: 2015-11
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9. Distribution of metabolites in galled and non-galled leaves of Clusia lanceolata and its antioxidant activity
Essential oils of galled and non-galled leaves of Clusia lanceolata Cambess., Clusiaceae, were obtained by hydrodistillation and analyzed by GC and GC/MS. The chemical composition of both oils was similar, with a predominance of sesquiterpene caryophyllenes. The extracts from the leaves were evaluated regarding total phenols, flavonoids and proanthocyanidins
Rev. bras. farmacogn.. Publicado em: 2014-12
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10. Análise dos produtos de degradação do esfenvalerato por SBSE/CLAE-UV/DAD utilizando planejamento fatorial fracionário
A simple procedure based on stir bar sorptive extraction and high-performance liquid chromatography-ultraviolet/photodiode array detection (SBSE/LC-UV/PAD) to determine intermediates and by-products of esfenvalerate is described. The influence of organic modifier, ionic strength, extraction time, temperature and pH were simultaneously evaluated by using a fa
Quím. Nova. Publicado em: 2014-06
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11. Compostos antioxidantes e atividade antioxidante total em frutos das variedades Flor Branca, Florida Sweet e BRS 366 de aceroleira
Informações sobre propriedades antioxidantes em diferentes estádios ontológicos podem ajudar os produtores e tecnólogos de alimentos a identificar quais cultivares e/ou estádio de maturidade são os mais adequados para a sua necessidade; portanto, o objetivo deste trabalho foi estudar as alterações no metabolismo antioxidante durante o desenvolviment
Rev. Bras. Frutic.. Publicado em: 2014-06
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12. First appraisal of water contamination by antifouling booster biocide of 3rd generation at Itaqui Harbor (São Luiz - Maranhão - Brazil)
Diuron e Irgarol são anti-incrustantes que, a despeito das evidências de suas toxicidades para várias espécies marinhas, ainda são utilizados em pinturas de embarcações e estruturas marítimas. No caso do Irgarol, já existe restrição de uso em vários países. Neste estudo, que é o primeiro registro dos biocidas na região caracterizada como sendo
J. Braz. Chem. Soc.. Publicado em: 2014-02