Hrgc
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Biofilm inhibition activity of compounds isolated from two Eunicea species collected at the Caribbean Sea
Abstract Biofilm has a primary role in the pathogenesis of diseases and in the attachment of multicellular organisms to a fouled surface. Because of that, the control of bacterial biofilms has been identified as an important target. In the present study, five lipid compounds isolated from soft coral Eunicea sp. and three terpenoids together with a mixture of
Rev. bras. farmacogn.. Publicado em: 2015-12
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2. Antiproliferative activity, antioxidant capacity and chemical composition of extracts from the leaves and stem of Chresta sphaerocephala
AbstractIn this study, antiproliferative and antioxidant activities of crude extracts (hexane, ethyl acetate and methanol) from leaves and stem of Chresta sphaerocephala DC., Asteraceae, were investigated. Antiproliferative activity was tested in vitro against ten human cancer cells and against VERO (no cancer cell). Antioxidant activities were determined us
Rev. bras. farmacogn.. Publicado em: 2015-08
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3. HS-SPME-GC-MS ANALYSIS OF VOLATILE AND SEMI-VOLATILE COMPOUNDS FROM DRIED LEAVES OF Mikania glomerata Sprengel
This paper reports on the identification of volatile and semi-volatile compounds and a comparison of the chromatographic profiles obtained by Headspace Solid-Phase Microextraction/Gas Chromatography with Mass Spectrometry detection (HS-SPME-GC-MS) of dried leaves of Mikania glomerata Sprengel (Asteraceae), also known as 'guaco.' Three different types of comm
Quím. Nova. Publicado em: 2015-03
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4. Evaluation of antimicrobial activity of extracts of Tibouchina candolleana (melastomataceae), isolated compounds and semi-synthetic derivatives against endodontic bacteria
This work describes the phytochemical study of the extracts from aerial parts of Tibouchina candolleana as well as the evaluation of the antimicrobial activity of extracts, isolated compounds, and semi-synthetic derivatives of ursolic acid against endodontic bacteria. HRGC analysis of the n-hexane extract of T. candolleana allowed identification of b-amyrin,
Brazilian Journal of Microbiology. Publicado em: 2012-06
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5. Diterpenes from marine brown alga Dictyota guineensis (Dictyotaceae, Phaeophyceae)
The crude extract of the marine brown alga Dictyota guineensis was analyzed by high-resolution gas chromatography-mass spectrometry (HRGC-MS). Five diterpenes were identified: dictyol E (the most abundant diterpene), dictyotadiol, dictyoxide, isopachydictyol A and pachydictyol A, all diterpenes from the chemical group I, i.e., mainly prenylated derivatives o
Revista Brasileira de Farmacognosia. Publicado em: 29/05/2012
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6. Análise de pesticidas organoclorados em óleos vegetais por cromatografia gasosa de alta resolução (HRGC)
Os óleos vegetais comestíveis foram introduzidos na dieta humana em substituição as gorduras animais nas últimas décadas sendo amplamente consumidos em todo o mundo. O presente artigo descreve o desenvolvimento de uma metodologia para análise de aldrin, dieldrin, endrin e endosulfan em óleos vegetais por cromatografia gasosa de alta resolução (HRGC
Eclética Química. Publicado em: 2010-09
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7. Hidrólise do óleo de Azadirachta indica em água subcrítica e determinação da composição dos triacilglicerídeos e ácidos graxos por cromatografia gasosa de alta resolução a alta temperatura e cromatografia gasosa de alta resolução acoplada à espectrometria de massas
The development of modern analytical tools plays an important role in quality control. The main purpose of this study was to explore the use of subcritical water as a versatile analytical tool, employed simultaneously as a reagent and solvent, as well as the application of high temperature-high resolution gas chromatography (HT-HRGC) to develop a procedure f
Química Nova. Publicado em: 2010
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8. Ácidos ciclopentênicos do óleo da sapucainha (Carpotroche brasiliensis Endl, Flacourtiaceae): o primeiro antileprótico usado no Brasil
The chaoolmugra oil is one of the oldest medicines used for leprosy until the development of sulfas. In Brazil, it is known as sapucainha oil that is obtained from Carpotroche brasilienesis seeds (Flacourtiaceae). Chemical and medicinal studies of sapucainha oil were introduced in Brazil by Peckolt, Cole and Cardoso which showed that major ciclopentenyl fatt
Química Nova. Publicado em: 2009
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9. Design, construction and evaluation of a simple pressurized solvent extraction system
Este trabalho descreve a construção e teste de um sistema simples de extração pressurizada com solvente (PSE). Uma mistura de acetona:água (80:20), a 80 ºC e 103,5 bar, foi utilizada para extrair dois herbicidas (Diuron e Bromacil) de uma amostra de solo contaminado. Os herbicidas foram identificados e quantificados por cromatografia líquida de alta e
Journal of the Brazilian Chemical Society. Publicado em: 2009
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10. Biomonitoramento das populações humanas através de avaliação de genotoxicidade em áreas sujeitas a risco ecotoxicológico
A emissão de uma grande diversidade de substâncias através dos efluentes industriais gasosos, líquidos ou sólidos acarreta que uma gama de compostos seja introduzida no ambiente atmosférico e aquático de meios urbanos. A exposição a substâncias genotóxicas no ambiente oferece freqüentemente um grande risco à saúde humana. Com essa preocupação
Publicado em: 2009
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11. Analysis of direct mono, di, triacylglyceride into biodiesel by high resolution gas chromatography: the resolution ANP 42 and its extensions / Análise direta de mono, di e triacilglicerídeos em biodiesel por cromatografia gasosa de alta resolução: resolução ANP 42 e suas extensões
Biodiesel is chemically defined as fatty acid mono-alkyl esters derived of vegetable oils, animal fats or discarded greases. The process more commonly employed for biodiesel production is transesterification catalyzed by base. The quality control of the produced biodiesel is essential for its use as fuel. The National Agency of Petroleum (ANP) establishes di
Publicado em: 2008
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12. Análise por cromatografia gasosa de BTEX nas emissões de motor de combustão interna alimentado com diesel e mistura diesel-biodiesel (B10)
This paper describes the procedures for analysing pollutant gases emitted by engines, such as volatile organic compounds (benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene) by using high resolution gas chromatography (HRGC). For IC engine burning, in a broad sense, the use of the B10 mixture reduces drastically the emissions of aromatic compoun
Química Nova. Publicado em: 2008