Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"hplc-dad"”.
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Cuantificación por HPLC-DAD de cafeína y trigonelina en Coffea arabica L y escopoletina en Persea schiedeana Ness.
… a cabo la metodología analítica mediante HPLC-DAD, y posteriormente se verificaron los parámetros de validación, utilizando como guía la ICH, y se comprobó que cada criterio de aceptación fue cumplido, por lo que los métodos son útiles para los propósitos empleados. Para P. schiedeana …
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Benzen v benzinech z hlediska ochrany zdraví
… chromatografie s detektorem diodového pole (HPLC/DAD). Okrajově se práce zaměřila také na stanovení toluenu (v červnu 2007 vstoupila v platnost vyhláška č. 284/2006 Sb., která zakazuje, aby byly malospotřebitelům prodávány přípravky, které obsahují více než 0,1 % toluenu). Toluen byl stanoven …
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Analytical methods for the determination of endocrine disruptors, UV filters and plastic additives in packaging and pharmaceuticals
… methods to determine in packaging: UV filters by HPLC-DAD, plastic additives by UHPLC-(ToF)MS and perfluorinated compounds by UHPLC-(QToF)MS/MS. In each work, a focused ultrasonic solid-liquid extraction (FUSLE), a fast, simple and relatively new extraction technique, is developed and optimized; …
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Assessment of chemical markers as surrogates for efficacy and safety of Rooibos extracts
… selected plant batches of green rooibos. HPLC-DAD analysis was performed to quantify aspalathin and other major flavonoids present in the extracts. A radioimmunoassay was used to measure 2-deoxy-[3H]-D-glucose absorption in C2C12 murine skeletal muscle and C3A human liver cells, exposed to …
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Fitotoxicidade, potencial inseticida e seletividade a organismos não alvos de Ficus carica Linn (Moraceae)
… presente trabalho, foi avaliada a potencial atividade inseticida da espécie vegetal Ficus carica e alguns de seus compostos isolados, investigando os componentes bioativos. Foram produzidos extratos a partir de folha (FCF) e galho (FCG) de F. carica por percolação exaustiva empregando etanol como …
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Intestinal absorption and metabolism of bush tea major phenolic compounds exhibiting anti-diabetic activity.
… the Caco-2 monolayer. Methods and materials: HPLC-DAD and LC/MS was used to identify major phenolic compounds within the extract as well as monitor the transport of these compounds across the intestinal barrier. Differentiated Caco-2 cells were used as a model to predict bioavailability and …
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Využití analytických technik a chemometrie k autentifikaci vín
… chromatografu s detekcí na diodovém poli (HPLC-DAD). Na základě znalostí o chemickém složení známých vzorků vín byly z těchto dat pomocí vícerozměrných statistických metod (shluková analýza, analýza hlavních komponent a kanonická diskriminační analýza) sestaveny matematické modely ke …
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Composição fenólica e capacidade antioxidante de juçara (Euterpe edulis) cultivada nos estados de Minas Gerais e Espírito Santo
… da irradiação gama e da pasteurização na estabilidade das principais antocianinas do fruto. Os frutos foram coletados em 7 microrregiões (5 microrregiões do estado de Minas Gerais e 2 do Espírito Santo) e despolpado. A composição fenólica foi identificada e quantificada por HPLC-DAD-MS/MS. Os …
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Estrategias analíticas para la puesta en valor de aceites de oliva extra vírgenes españoles de alta calidad
La calidad del aceite de oliva virgen se puede evaluar de múltiples formas, aunque la única recogida por las reglamentaciones se basa en la evaluación de parámetros sensoriales y fisicoquímicos. Los compuestos volátiles son los responsables del apreciado aroma del aceite de oliva virgen y los …
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Natural Variability in Phenolic and Sesquiterpene Constituents Among Burdock (<i>Arctium lappa</i> L. and <i>Arctium minus</i> L.) Leaves for Potential Medicinal Interests
… and antioxidant power and then quantified on an HPLC-DAD instrument.</p><p>The variability in potentially bioactive chemical constituents among burdock individuals within the population was substantial. <i>Arctium lappa</i> and <i>A. minus</i> had high levels of variability for flavonoids and …
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Metabolite Production in Callus Culture of Burdock (Arctium lappa L.)
… by the Folin-Cuicaktey assay and reversed-phase HPLC-DAD methods.</p><p>Burdock callus could be induced from burdock cotyledon or leaf sections in the dark on media with 1 mg/L BA and 2 mg/L 2, 4-D, and then maintained over the long term on media with 1.5 mg/L NAA and 1 mg/L 2, 4-D. Various …
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Development of analytical techniques for probing the effects of -haematin inhibiting compounds on the malaria parasite Plasmodium falciparum
… in this work, a novel 96-well plate HPLC-DAD cellular haem fractionation method was developed and validated for quantifying intracellular haem species in the P. falciparum cell. The technique has eliminated the use of toxic pyridine to complex haem for the detection of unsequestered …
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An investigation into the antineoplastic potential of Bridelia Micrantha Constituents
… monitor of bioactivity. Direct-infusion ESI-MS, HPLC/DAD/MS and TLC were used as monitors of fraction constituency. Fractions eluted from C18 and ion exchange sorbents were shown to possess decreased biological activity owing to incomplete distribution of the analytes and/or the separation of …
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Characterization of Mycochemicals and Bioactivities of a New Zealand Native Mushroom Hericium novae-zealandiae
… column chromatography combined with preparative HPLC was used to isolate compounds, which were then characterized by spectroscopic methods, namely UV, MS, NMR and single crystal X-ray diffraction. The HPLC-DAD method was subsequently applied for the quantification of the identified compounds. In …
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Photochemische Abbauprozesse von polybromierten Diphenylethern in homogenen und heterogenen Systemen
… W) erreicht. Der Verlauf der Photolyse wurde mit HPLC-DAD und/oder mit GC-MS verfolgt. Von den PentaBDEs sind BDE 99 und BDE 100 am häufigsten in der Umweltprobe aufgetreten und haben zugleich den größten Gewichtsanteil in der kommerziellen Mischung DE-71. Während der Photolyse von BDE 100, 99 und …
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Development of an efficient method for isolation and purification of bioactive Compounds from panax ginseng and rhodiola rosea using high performance counter current chromatography
… purity of ginsenosides Re and Rc was assessed by HPLC–DAD to be 97.5% with 98.2% recovery and 92.6% with 96.3% recovery. These purified ginsenosides was identified using commercial reference standard on the HPLC and MS.A simple and efficient high-performance counter-current chromatography method …
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Avaliação do perfil de estabilidade do terconazol e caracterização de seus produtos de degradação
… estudo de degradação forçada do TCZ, com a finalidade de desenvolver um MIE por CLAE-DAD e caracterizar seus produtos de degradação. Foram seguidas as diretrizes trazidas pela ICH para as condições de estresse ácido, básico, oxidativo, fotolítico, alta temperatura e umidade. Além disso, foram …
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Design of silica-based sustainable biomaterial adsorbents from agricultural waste for the microextraction and adsorptive removal of insecticides and antibiotics from wastewater samples
… microextraction (DMSPME) coupled with HPLC-DAD yielded recoveries of 99.1–101%, low detection limits (0.028 μg/L for SMX and 0.035 μg/L for SMT), and adsorption capacities of 66.4 mg/g (SMX) and 55.3 mg/g (SMT). The adsorption behaviour suggested that electrostatic interactions and …
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Zuckerphosphate als Vorläufer von 4-Hydroxy-3(2H)-furanonen - Biochemische Transformation durch die Hefe Zygosaccharomyces rouxii und chemische Bildung unter physiologischen Bedingungen
… 1H-NMR-Spektroskopie belegt werden. Anhand von HPLC-MS/MS-Analysen wurde die Bildung von HMF in zellfreien cytosolischen Rohproteinextrakte aus Z. rouxii, welche mit Fru-1,6-dP und Nicotinamidadenindinucleotiden (NAD, NADH, NADP, NADPH) inkubiert worden waren, nachgewiesen. In Substratstudien …
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Heterocyclic compounds in tar oil contaminated groundwater : occurence, fate, and indications for natural attenuation
… were developed. In addition to an existing HPLC-DAD method for the detection of a huge number of NSO- heterocycles, an LC-MS-MS method for a selective and sensitive analysis of N- heterocycles as well as a Headspace-GC-MS method for the analysis of volatile analogs was performed. The …
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