Chiral Hplc
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Determination of Enantioselectivities by Means of Chiral Stationary Phase HPLC in Order to Identify Effective Proline-Derived Organocatalysts
The pyrrolidine fragment is a privileged scaffold within chiral ligands employed in coordination complexes exhibiting catalytic activity in asymmetric reactions and, more recently, as enantioselective organocatalysts per se. Likewise, the employment of (S)-proline as starting material constitutes the most direct form to synthesize those chiral derivatives. A
J. Braz. Chem. Soc.. Publicado em: 2018-05
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2. Application of a New Strategy of Validation Based on "β,γ-Content Tolerance Interval" for Checking the Chiral Chromatography Method for Quantification of the Chiral Impurity of Levofloxacin
A simple and accurate chiral high performance liquid chromatography (HPLC) method was developed for determination of Levofloxacin and its chiral impurity (R)-enantiomer. The chiral impurity Levofloxacin separation method was optimized by Box-Behnken design and validated by an innovative analytical approach recently developed in our laboratory. This last appr
J. Braz. Chem. Soc.. Publicado em: 2016-03
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3. Super/subcritical fluid chromatography with packed columns: state of the art and applications
Separations using supercritical fluid chromatography (SFC) with packed columns have been re-discovered and explored in recent years. SFC enables fast and efficient separations and, in some cases, gives better results than high performance liquid chromatography (HPLC). This paper provides an overview of recent advances in SFC separations using packed columns
Quím. Nova. Publicado em: 2014-07
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4. The development and validation of a chiral high performance liquid chromatography method for the identification and quantification of (R)-enantiomer in 10-hydroxycamptothecin
Um novo método isocrático, rápido e simples da cromatografia líquida de alta performance (HPLC) de fase normal quiral foi desenvolvido e validado para a separação enantiomérica do ácido (S)-10-hidroxicamptotecin (10 HCTN), ((4S)-4-etil-4,9-dihidro-1H-pirano [3',4':6,7] indolizina [1,2-b] quinolina-3, 14 (4H, 12H)-diona), um fármaco anti-cancerígeno
J. Braz. Chem. Soc.. Publicado em: 2014-01
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5. Alternative and simple normal-phase HPLC enantioseparation of a chiral amino acid-type spin label derivative
Neste trabalho desenvolveu-se um processo alternativo para separação cromatográfica dos enantiômeros (+)-(3R,4R) e ( - )-(3S,4S) do β-aminoácido quiral trans-2,2,5,5-tetrametilpirrolidina-3-amino-4-carboxílico (POAC), que estava protegido no grupo amínico para posterior ligação a um peptídeo, polímero ou outra macromolécula. A enantioseparação
J. Braz. Chem. Soc.. Publicado em: 2013-11
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6. ReaÃÃes biocatalÃticas usando cÃlulas Ãntegras de Lens culinaris (Lentilha). / REACTIONS USING WHOLE CELL BIOCATALYTIC LENS CULINARIS (LENTIL)
This paper describes the use of seeds of lentil (Lens culinaris) as intact plant system in biocatalytic reactions of reduction and hydrolysis. Initially, some plant sources were evaluated for their action in the biocatalytic reduction of aromatic ketone acetophenone. The plants that showed positive results in the reduction reaction underwent determination of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/10/2012
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7. Evaluation of microbiological and biomimetic models in stereoselective metabolism of risperidone by high-performance liquid chromatography / Avaliação de modelos microbiológicos e modelos biomiméticos no metabolismo estereosseletivo da risperidona por cromatografia líquida de alta eficiência
Risperidone is an atypical antipsychotic drug. Its metabolism yields in two hydroxylated chiral metabolites, 7-hydroxyrisperidone (7-RispOH) and 9-hydroxyrisperidone (9-RispOH). The 9-RispOH metabolite presents the same pharmacologic activity of the parent drug risperidone. This led this drug to be marketed as drug under the generic name paliperidone. Studie
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/08/2012
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8. Avaliação de técnicas miniaturizadas de preparação de amostras na análise enantiosseletiva de fármacos quirais com diferentes características ácido-base em meio microssomal e aplicação em estudos de metabolismo in vitro / Evaluation of microextraction techniques for sample preparation for the enantioselective analysis of chiral drugs with different acid-base characteristics in microsomal medium and application to in vitro metabolism studies
Neste trabalho, a microextração em fase líquida com membrana cilíndrica oca (HF-LPME), a microextração líquido-líquido dispersiva (DLLME) e a microextração em fase sólida na configuração de um filme delgado (SPME/TFME) foram empregadas como técnicas de microextração para a preparação de amostras microssomais no estudo de metabolismo in vitr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/04/2012
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9. A validated chiral LC method for the enantiomeric separation of repaglinide on immobilized amylose based stationary phase
Um método de HPLC quiral em fase normal, simples, rápido, isocrático, foi desenvolvido e validado para a separação enantiomérica de repaglinida, ácido (S)-(+)-2-etóxi-4-N [1-(2-piperidinofenil)-3-metil-1-butil] aminocarbonilmetil] benzóico, uma substância antidiabética. Os enantiômeros de repaglinida foram resolvidos em uma coluna Chiralpak IA (f
Journal of the Brazilian Chemical Society. Publicado em: 2012-06
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10. Investigação in vitro do efeito da restrição proteica no metabolismo do albendazol em ratos e estudos de inibição do crescimento de células tumorais humanas pelos enantiômeros do albendazol sulfóxido / Investigation in vitro of effect of protein restrict in the metabolism of albendazole in rats and growth inhibition studies in human tumor cells by enantiomers of albendazole sulphoxide
This work presents an in vitro investigation of protein restriction in the metabolism of albendazole (ABZ). The study was conducted with microsomal fractions obtained from Wistar rats using a High Performance Multidimensional Liquid Chromatography method which was developed and fully validated for the determination of the ABZ metabolites albendazole sulphoxi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/12/2011
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11. Production of enantiomerically pure D-Phenylglycine using Pseudomonas aeruginosa 10145 as biocatalyst
Different bacterial strains were screened to detect nitrilase and/or nitrile hidratase/amidase activities towards benzonitrile, to be used as biocatalyst to produce enantiomerically pure non-proteinogenic amino acids using amino nitriles as starting material. The best biocatalyst found was Pseudomonas aeruginosa 10145, which showed high enzyme activities. Wh
Brazilian Journal of Chemical Engineering. Publicado em: 2008-03
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12. Separação dos enatiômeros do cetoprofeno e do fenoprofeno por CLAE em fase estacionária quiral / Separation of ketoprofen and fenoprofen enantiomers by HPLC using chiral stationary phase
Durante muito tempo, os fármacos quirais de origem sintética foram comercializados predominantemente como racematos. Atualmente, sabe-se que os enantiômeros de um fármaco quiral podem apresentar propriedades farmacocinéticas, farmacodinâmicas e toxicológicas bastante distintas. Assim sendo, técnicas analíticas enantiosseletivas são fundamentais par
Publicado em: 2008