HPLC-DAD-MS 1
Phenolic profile in the quality control of walnut (Juglans regia L.) leaves
... by HPLC/DAD analysis revealed that phenolic acids and flavonoids were the two main groups of compounds in walnut leaf ...peaks 1, 2, 3 (Fig. 1), presented spectral characteristics of cinnamic ...
7
Detecção in silico e caracterização dos constituintes micromoleculares majoritários do fungo endofítico Colletotrichum gloeosporioides isolado de folhas de Garcinia xanthochymus usando HPLC-DAD-HRMS e GC-MS
... por 1 H RMN e HPLC-DAD, os meios de milho e extrato de malte foram selecionados para o estudo químico, sendo cultivados em larga ...por HPLC-DAD-HRMS: colletodiol (7); fischerina (8); ...
124
J. Braz. Chem. Soc. vol.19 número5
... systems HPLC-DAD and GC-MS, ...(Table 1), it was observed that in distilled water a larger degradation of the herbicide occurs when compared with surface water using an irradiation time up to ...
9
Scientific validation of synergistic antioxidant effects in commercialized mixtures of Cymbopogon citratus and Pterospartum tridentatum or Gomphrena globosa for infusions preparation
... in 1 mL of 20% aqueous methanol and filtered through a ...for HPLC analysis. Betacyanins were determined by HPLC as previously described by the authors (Roriz et ...by DAD, using 520 nm as the ...
26
HPLC DAD methodology for the quantification of organic acids, furans and
... [43]. DAD methods are the most common [11–13, 38, 40, 41, 44–56], but other detection methods as electrochemical [57, 58] and MS [59–61] have also been ...Table 1, several published methods are ...
12
HPLC-DAD-ELSD Combined Pharmacodynamics and Serum Medicinal Chemistry for Quality Assessment of Huangqi Granule.
... Before administration and 5 min, 15 min, and 30 min after oral administration of the ex- tract, a short piece of heparinized capillary tubing was used to puncture the orbital sinus at the posterior angle of the eye, and ...
15
J. Braz. Chem. Soc. vol.21 número8
... Em nossas pesquisas anteriores encontramos que o extrato bruto de Neo-T. siphonanthun apresentou atividade eicaz para captura de radicais DPPH (1,1-difenil-2-picrilidazida). Neste estudo, um método de triagem rápida ...
6
Marmelo (cydonia oblonga miller): fonte de compostos biologicamente activos
... por Hplc/DAD/mS, uma técnica que ainda é pouco praticada em portugal, tendo-se verificado que o perfil das várias partes do fruto, polpa, casca e semente, é bastante distinto (Figura 1): as ...
11
J. Braz. Chem. Soc. vol.21 número12
... A degradation system using metallic iron and hydrogen peroxide (Fenton reaction) was employed for the degradation of the diuron herbicide. In order to obtain the maximum degradation the main conditions such as pH, ...
6
Phenolic profile of Sercial and Tinta Negra Vitis vinifera L. grape skins by HPLC–DAD–ESI-MS
... of Madeira Island (Portugal). To evaluate the phenolic profile of these two varieties, a sampling strategy was designed that includes five sampling moments for Sercial, from August 2 (véraison – day 0) to September 20 ...
11
HPLC-UV, MALDI-TOF-MS and ESI-MS/MS analysis of the mechlorethamine DNA crosslink at a cytosine-cytosine mismatch pair.
... using HPLC coupled with UV detection. The use of HPLC-UV for monitoring the progress of enzymatic digestion is useful for optimization of the reaction conditions ...The HPLC chromatogram for the ...
9
Determinação do perfil fitoquímico de extrato com atividade antioxidante da espécie medicinal Cordia verbenacea DC. por HPLC-DAD .
... ABSTRACT: Phytochemical proile determination from extracts with antioxidant activity of the medicinal species of Cordia verbenacea DC. by HPLC-DAD. The objective of the present study was to investigate the ...
6
Uma metodologia analítica rápida para quantificação simultânea de estrógenos em águas usando HPLC-DAD e calibração de segunda ordem
... empregando HPLC-DAD e calibração multivias com propósito de explorar as potencialidades da vantagem de segunda ordem para contornar os problemas da complexidade da ...
75
UNIVERSIDADE FEDERAL DE SÃO CARLOS Centro de Ciências Exatas e de Tecnologia Departamento de Química Programa de Pós-graduação em Química
... avaliou-se através de ferramentas quimiométricas e de desenvolvimento de métodos analíticos como HPLC-DAD, LC-MS/MS, LC-UV-SPE-NMR e HR- MAS a variação quantitativa de alguns meta[r] ...
357
A STUDY ON HISTORICAL DYES USED IN TEXTILES: DRAGON’S BLOOD, INDIGO AND MAUVE
... In this work, significant effects of solvent purity on quantum yields of reaction for indigo and its water soluble derivative indigo carmine were observed. Quantum yields of reaction were obtained at 335 nm and 610 nm ...
149
MCR-ALS APPLIED TO THE QUANTITATIVE MONITORING OF THE ELECTRODEGRADATION PROCESS OF ATRAZINE USING UV SPECTRA: COMPARATIVE RESULTS WITH HPLC-DAD AS A REFERENCE METHOD.
... Um espectrofotômetro Ocean Optics USB4000 Miniature Fiber Optic Spectrometer foi utilizado para monitoramento contínuo das eletrodegradações. Uma cubeta para análise em luxo foi usada du- rante as análises e uma bomba ...
9
Analysis of bioactivities and chemical composition of Ziziphus joazeiro Mart. using HPLC–DAD
... The aim of this study was to evaluate the chemical profile and antioxidant, antimicrobial and antipara- sitic activities of the hydroalcoholic extract of the leaves of Ziziphus joazeiro Mart. (HELZJ). The antioxi- dant ...
7
Quantification of methyl salicylate in four genera of the Polygalaceae by HPLC-DAD.
... com salicilato de benzila e outros compostos voláteis, foi demons- trado que a CLAE também é eficiente. O estudo de Villa também demonstrou que a CLAE pode ser considerada uma técnica simples, rápida, econômica e ...
4
J. Braz. Chem. Soc. vol.22 número6
... C. glaziovii has about 16 to 20 meters tall in their adult stage and leaves with green color on both sides. On the other hand, C. pachystachya reaches a maximum of 12 meters and its leaves have dense arachnoid indumentum ...
7
Development and validation of an HPLC-MS/MS method for the early diagnosis of aspergillosis.
... of MS/MS optimization, the two most intense fragment signals for each compound were obtained: one for quantification (m/z ...containing 1 mM ammonium formate, eluted at 200 m L min 21 . To develop ...
9