Chiral Stationary Phase
Mostrando 1-12 de 22 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. CHROMATOGRAPHIC SEPARATION OF VERAPAMIL RACEMATE USING A VARICOL CONTINUOUS MULTICOLUMN PROCESS
Abstract Verapamil is a chiral drug that is marketed in its racemic form, but because of the pharmacological effects due to molecule’s chirality, one of the enantiomers is more potent, and the other exhibits different activities of therapeutic interest. The preparative separation of the verapamil enantiomers was performed using a continuous Varicol unit op
Braz. J. Chem. Eng.. Publicado em: 2015-12
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3. 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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4. Caracterização e aplicação da fase estacionaria quiral tris(3,5-dimetilfenilcarbamato) de amilose na separação preparativa dos enantiomeros do omeprazol / Characterization and application of the amylose tris(3,5-dimethylphenylcarbamate) chiral stationary phase in omeprazole enantiomer preparative separation
O objetivo deste trabalho foi a síntese, em larga escala, da fase estacionária quiral tris(3,5-dimetilfenilcarbamato) de amilose e posterior investigação desta na separação preparativa dos enantiômeros do omeprazol por cromatografia líquida de alta eficiência. O carbamato de amilose, caracterizado por análise elementar e espectroscopia na região d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/07/2009
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5. Aplicação da microextração em fase liquida na análise de alguns fármacos antimaláricos e respectivos metabólitos em plasma / Application of liquid-phase microextration to the analysis of some antimalarial drugs and their metabolites in plasma
Currently, malaria is the main parasitic infection and shows worldwide distribution. Among therapeutic options used, chloroquine (CQ), mefloquine (MQ) and, more recently, artemether (ART) have been standing out. According to the literature, pharmacokinetic studies of these drugs have been hampered by the lack of proper methods of analysis in biological fluid
Publicado em: 2009
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6. Estereoselective analysis of cis-tramadol hydrocloride and its impurities in raw material and pharmaceutical formulation / Análise estereosseletiva do cloridrato de cis-tramadol e de suas impurezas em matéria-prima e formulação farmacêutica
Tramadol hydrochloride is a centrally acting analgesic with two chiral centers; the cis isomer is the active drug and the trans isomer is a process impurity. Both enantiomers of cis-tramadol hydrochloride contribute to the analgesic effect through different, but complementary and interactive pharmacological mechanisms. Although both isomers of cis-tramadol h
Publicado em: 2008
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7. 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
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8. Determinação dos enantiômeros da atropina em soluções oftálmicas empregando a cromatografia líquida de alta eficiência com fase estacionária quiral / Determination of atropine enantiomers in ophthalmic solutions by liquid chromatography using a chiral stationary phase
There are many therapeutic agents commercialized under racemic form. The enantiomers can show significant differences in the pharmacokinetic and pharmacodynamic profiles. The use of pure enantiomer in pharmaceutical formulations can result in better adjustment of dose and less adverse effects. Atropine, an alkaloid of the Atropa belladonna, is a racemic mixt
Publicado em: 2007
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9. Separação cromatografica quiral do o,p -diclorodifenildicloroetano (mitotano) em fase estacionaria quiral O,O bis[4-terc-butilbenzoil]-N,N dialil-L-tartadiamida / Chiral chromatographic separation of the o,p -dichlorodiphenyldichloroethane (mitotane) using chiral stationary phase O,O -bis{4-terc-butylbenzoyl]-N,N -diallyl-L-tartardiamide
O mitotano (o,p?-diclorodifenildicloroetano) é um fármaco utilizado no tratamento de carcinoma adrenocortical. Ele é comercializado na forma racêmica, ou seja, na proporção 1:1 dos seus enantiômeros R e S. A influência da quiralidade da molécula sobre seu efeito farmacológico ainda não foi estudada. Portanto, a separação dos enantiômeros é imp
Publicado em: 2007
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10. Separação do racemato N-Boc-Rolipram pelo processo cromatografico de leito movel simulado utilizando fase estacionaria quiral tris-(3,5-dimetilfenilcarbamato de celulose) suportada em silica
Chiral stationary phases (CSPs) have shown efficiency in racemate purification. Rolipram, (mais ou menos)-4-(3-(cyclopentyloxy)-4-methoxyphenyl)- pyrrolidin-2-one, is an antidepressant with significant pharmacological properties. The main objective of this work was Rolipram purification in the Chiral Stationary Phase tris(3,5-dimethylphenylcarbamoyl) cellulo
Publicado em: 2005
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11. Análise enantiosseletiva da mirtazapina em plasma: comparação de métodos de preparação das amostras / Enantioselective analysis of plasma mirtazapine: comparison of sample preparation methods
The increased interest in enantioselective pharmacokinetic and pharmacodynamic properties of chiral drugs, aiming to establish the advantages in the production of estereochemically pure drugs, has led to the development of methods of analysis with low limits of quantification, selectivity and reproducibility, which are suitable to be used in kinetic disposit
Publicado em: 2005
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12. Simulated moving-bed adsorption for separation of racemic mixtures
The two enantiomers that constitute a racemate have different activities when employed as pharmaceuticals. Due to this fact, fully recognized today, the pharmaceutical industry has been forced to market pure enantiomers instead of the racemic mixture whenever a chiral compound is involved. The simulated moving bed (SMB) is a chromatographic process that, unl
Brazilian Journal of Chemical Engineering. Publicado em: 2004-01