HPLC Analysis
On-line HPLC analysis of the antioxidant activity of phenolic compounds in brewed, paper-filtered coffee
... study, HPLC analysis revealed that the antioxidant capacity of coffee prepared from green beans was due to chlorogenic acids, with the main contributors being 5-O-caffeoylquinic acid and to a lesser degree ...
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HPLC analysis, antimicrobial and antioxidant activities of Daphne cneorum L.
... (HPLC) analysis was carried out on an Agilent 1200 Series HPLC instrument with: C18 column (C18; 25 ...of HPLC grade, and was pur- chased from Merck (Darmstadt, ...
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HPLC analysis of phenolic compounds in extract
... The extract was dissolved in 70% ethanol, filtered and 1-10 µl of the solution was analyzed by HPLC using a modified method (Rodtjer et al. 2006). Analyses were carried out with a gradient forming Hewlett Packard ...
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Uncertainty estimation and in-house method validation of HPLC analysis of carotenoids for food composition data production
... For small-scale within-region carotenoids variability evaluation, 12 lots (1 kg each) of firm ripe tomato (Lycop- ersicon esculentum M. var. Lido) samples produced from organic plants starters grown in a farm at the ...
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HPLC analysis of nicotinic acid, trigonelline, chlorogenic acid and caffeine in roasted coffee.
... Nas análises foram empregados padrões (de grau analítico) da Sigma (Steihhein, Alemanha) de ácido caféico (ácido 3,4-diidroxi- cinâmico), ácido ferúlico (ácido 4-hidroxi-3-metoxicinâmico[r] ...
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RESULTS AND DISCUSSION Optimization of HPLC condition
... methanol, ammonia solution, chloroform, HCl, triethylamine (TEA) and ammonium chloride were analytical grade (Sinopharm Chemical Reagent Co., Ltd, Shanghai, China). Acetonitrile used in HPLC analysis were ...
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HPLC FOR CONTROL STABILITY OF QUERCETIN INJECTABLE DOSAGE FORM
... spectrums. HPLC analysis results show that the quercetin is stable in ampouled form under autoclave and storage and freshly diluted quercetin concentrate for infusion are ...by HPLC chromatograph ...
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Validação de método HPLC-UV para determinação de impurezas genotóxicas
... The analysis were carried out in a high performance liquid chromatography with ultraviolet detection (HPLC-UV), using isocratic operating conditions, a C-8 column and other operating parameters previously ...
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Microscale extraction method for HPLC carotenoid analysis in vegetable matrices
... Taken as a reference for comparison purposes, the commonly used carotenoid extraction procedure was performed as described by Rodriguez-Amaya (2001), us- ing limited light and controlled temperature to minimize ...
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Key words: Moxifloxacin; Microbiological assay; HPLC assay; Pharmaceutical analysis;
... microbiological analysis, samples were thawed and vortexed for 30 second, then three replicates of 200 µl volumes from each sample were directly introduced into the ...For HPLC analysis 250 µl of ...
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Desenvolvimento e validação de um método para a caracterização de vinhos por HPLC-DAD
... No âmbito deste trabalho pretendia-se efetuar a otimização e validação de um método analítico de cromatografia líquida de alta eficiência (HPLC) com detetor de rede de díodos (DAD) para a determinação de ácidos ...
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HPLC-FL for determination of hormones in bivalves
... the HPLC analytical column, a pre-column was added into the HPLC instrumentation, which increased the backpressure of the analytical column and also the retention times of the ...
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Development of new analytical methods for the analysis of an emerging pharmaceutical pollutant (ibuprofen): analysis by capillary electrophoresis and HPLC coupled with off-line SPE
... in HPLC and CE instrumentation (general operating range 190 - 600 nm) directly measure analyte responses, following Beer’s Law that absorbance is directly proportional to analyte concentration 245 ...
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Determinação multirresidual de pesticidas por HPLC no contexto de exposição ocup...
... A combinação da cromatografia líquida de alta eficiência (HPLC) e da espectrômetria de massas confere ao método níveis desejáveis de sensibilidade, seletividade, especificidade, rapidez de análise e possível ...
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SIMULTANEOUS ANALYSIS OF BIOLOGICAL INDICATORS OF EXPOSURE TO ETHYLBENZENE, STYRENE, TOLUENE AND XYLENE SOLVENTS IN URINE BY HPLC-UV.
... SIMULTANEOUS ANALYSIS OF BIOLOGICAL INDICATORS OF EXPOSURE TO ETHYLBENZENE, STYRENE, TOLUENE AND XYLENE SOLVENTS IN URINE BY ...simultaneous analysis of phenylglyoxylic (PGA), mandelic (MA), hippuric (HA), ...
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Monitoring malolactic fermentation using HPLC-UV-RI
... A se lectiv e and fast method for the quantitative determination of chloroanisoles in wines using. so lid ph as e microextraction and gas chromatography-quadrupole mass spectrom[r] ...
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Determinação simultânea das vitaminas do complexo B em carne de bovino por HPLC
... 40 Tanto na técnica 1 como a 5, onde só se optou por uma hidrólise ácida os resultados obtidos foram pouco satisfatórios, como se pode observar pela representação gráfica (Figura 20 a) e e)). Comparando estes dois ...
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HPLC-UV, MALDI-TOF-MS and ESI-MS/MS analysis of the mechlorethamine DNA crosslink at a cytosine-cytosine mismatch pair.
... The HPLC- purified crosslinked duplex was obtained by collecting the appropriate eluting peak and desalting by ultracentrifugal filtration (Microcon H YM-3; Millipore, Billerica, MA) at 5000 rpm for 45 ...
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Extração e caracterização de pectinas por método químico, inflavermelho e HPLC - ELSD
... until analysis structural characterization by different analytical ...and HPLC coupled to detection by evaporative light scattering ...For HPLC determination were evaluated stationary phases (ODS-2 ...
140
Reciclagem de solventes orgânicos não halogenados: recuperação de acetonitrilo de resíduos de HPLC
... A obtenção de acetonitrilo para utilização de HPLC foi estudada através da recuperação de acetonitrilo por destilação e purificação, bem como através de um tratamento de troca iónica ácida em resina. O solvente ...
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