Consulta: subjectFacets:"GC/MS"
Registros recuperados: 9
Data/hora: 12/06/2024 01:03:57

The determination of polycyclic aromatic hydrocarbons in seawater from the Fluxmanche transect (Dover Strait)
Provedor de dados: 5
Autores: Law, Rj; Whinnett, Ja.
Concentrations of a range of polycyclic aromatic hydrocarbons (PAH) were determined by means of coupled gas chromatography-mass spectrometry (GCMS). Water samples were collected, using a contamination-free sampling device, at two depths (Im subsurface and 3 m above the seabed) at each of the six stations established in the Dover Strait. The stations were occupied during June and October 1990, and July 1991. Concentrations of PAH were often close to or below the limits of detection for samples of 10.8 1 volume, although a number of samples exhibited high concentrations (of naphthalenes in particular) which were apparently derived from shipping inputs in the Dover Strait. Future work will require the development of methods with lower limits of detection, and...
Tipo: Text
Palavras-chave: Hydrocarbures polycycliques aromatiques; Eau de mer; Fluxmanche; CG/SM; Pas-de-Calais; POLYCYCLIC AROMATIC HYDROCARBONS; SEAWATER; FLUXMANCHE; GC/MS; DOVER STRAIT.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00323/43391/43045.pdf

Composición química del aceite esencial de hojas de Siparuna schimpffii Diels (limoncillo)
Provedor de dados: 98
Autores: Noriega Rivera,Paco Fernando; Guerrini,Alexandra; Ankuash Tsamaraint,Edwin.
Introducción: Siparuna schimpffii Diels, conocida vulgarmente como limoncillo, es una planta medicinal usada comúnmente por el pueblo Shuar del Ecuador por sus propiedades analgésicas. Objetivo: determinar la composición química del aceite esencial extraído de las hojas de Siparuna schimpffii Diels (limoncillo). Métodos: se recolectaron las hojas de S. schimpffii Diels. Posteriormente se obtuvo su aceite esencial, mediante destilación en corriente de vapor. Para identificar las moléculas presentes en el aceite se emplearon los métodos: GC, GC/MS, cálculo del IK, y RMN. Resultados: fueron detectados un total de 57 componentes, en 41 de ellos fue determinada su estructura química, lo que equivale al 93,247 %. Se confirmó la estructura del componente...
Tipo: Journal article
Palavras-chave: Siparuna schimpffii Diels; Aceite esencial; GC/MS; RMN.
Ano: 2014
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962014000200002

Teor e composição química do óleo essencial de Hyptis marrubioides Epl., Lamiaceae em função da sazonalidade - doi: 10.4025/actasciagron.v32i3.3415
Provedor de dados: 1
Autores: Botrel, Priscila Pereira; UFLA; Pinto, José Eduardo Brasil Pereira; UFLA; Ferraz, Vany; UFMG; Bertolucci, Suzan Kelly Vilela; UFLA; Figueiredo, Felipe Campos; Campus-Pesquisa.
Os óleos essenciais são princípios odoríferos armazenados em células especiais da planta. O óleo essencial no gênero Hyptis é usado como anestésico, antiespasmódico, anti-inflamatório e pode induzir aborto em doses elevadas. O objetivo deste trabalho foi avaliar a influência da sazonalidade no teor e composição do óleo essencial de Hyptis marrubioides. O delineamento experimental foi inteiramente casualizado, com quatro tratamentos (inverno, primavera, verão e outono) e seis repetições, totalizando 60 plantas. O óleo essencial foi extraído por hidrodestilação, em aparelho de Clevenger. A análise qualitativa do óleo essencial foi por cromatografia em fase gasosa (CG/EM). Na estação do verão, as folhas das plantas de H. marrubiodes apresentaram os maiores...
Palavras-chave: 5.01.03.00-8 óleo essencial; Avaliação sazonal; CG-EM Fitotecnia essential oils; Seasonal evaluation; GC/MS.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3415

Chemical composition fluctuations in roots of Plumbago scandens L. in relation to floral development
Provedor de dados: 42
Autores: Paiva,Selma R.; Lima,Lucilene A.; Figueiredo,Maria Raquel; Kaplan,Maria Auxiliadora C.
Plumbago scandens L. is a Brazilian tropical/subtropical species that occurs along the coast. Chemically it is mainly represented by naphthoquinones, flavonoids, terpenoids and steroids. The aim of the present work is to study quantitative changes in the root metabolic production of Plumbago scandens during different physiologic developmental stages relative to floration. The results indicated the presence of four substances in the extracts: plumbagin, epi-isoshinanolone, palmitic acid and sitosterol, independent on developmental stage. The naphthoquinone plumbagin has always showed to be the major component of all extracts. Naphthoquinones exhibited their highest content during floration, while the content of the two others components decreased during...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GC/MS; Plant physiology; Plubaginaceae; Secondary metabolites.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400004

Volatile Organic Compounds Produced by Human Skin Cells
Provedor de dados: 48
Autores: ACEVEDO,CRISTIAN A; SÁNCHEZ,ELIZABETH Y; REYES,JUAN G; YOUNG,MANUEL E.
Skin produces volatile organic compounds (VOCs) released to the environment with emission patterns characteristic of climatic conditions. It could be thought that these compounds are intermediaries in cell metabolism, since many intermediaries of metabolic pathways have a volatile potential. In this work, using gas chromatography, we answered the question of whether VOC profiles of primary cultures of human dermal fibroblasts were affected by the type of culture conditions. VOCs were determined for different types of culture, finding significant differences between skin cells grown in classical monolayer culture -2D- compared with 3D matrix immobilized cultures. This indicates that VOC profiles could provide information on the physiological state of skin...
Tipo: Journal article
Palavras-chave: GC/MS; Skin cells; SPME; Volatile organic compounds.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000400009

Essential oils of camphor tree (cinnamomum camphora nees &amp;amp; eberm) cultivated in Southern Brazil
Provedor de dados: 52
Autores: Frizzo,Caren D.; Santos,Ana C.; Paroul,Natalia; Serafini,Luciana A.; Dellacassa,Eduardo; Lorenzo,Daniel; Moyna,Patrick.
The essential oils of two varieties of Camphor tree (Cinnamomum camphora Nees &amp;amp; Eberm, Lauraceae), known as Hon-Sho and Ho-Sho cultivated in experimental stands in Southern Brazil were studied. The essential oils were obtained from the leaves and twigs of young plants by hydrodistillation. The identification of the components was performed using GC, GC/MS and retention indexes on methyl silicone and carbowax phases. The main components identified were linalool in the Ho-Sho and camphor in the Hon-Sho.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cinnamomum camphora; Leaves; Essential oils; GC/MS; Linalool; Camphor.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000300011

Phenolic Profile, Essential Oil Composition and Bioactivity of Lasia spinosa (L.) Thwaites
Provedor de dados: 52
Autores: Rahman,Atiqur; Siddiqui,Shah Alam; Oke-Altuntas,Feyza; OKAY,Sezer; GÜL,Fatih; Demirtas,Ibrahim.
Abstract Lasia spinosa (L.) Thwaites is a widely used ethnomedicinal plant in Bangladesh. In this study, we investigated phenolic contents, volatile compounds and fatty acids, and essential oil components of extracts prepared from aerial parts of the plant. The main volatile compounds were methyl ester of oleic acid, palmitic acid and stearic acid as determined by GC/MS. Phenolic contents of the extracts were determined qualitatively and quantitatively by HPLC/TOF-MS. Six phenolic compounds (syringic acid, morin, gentistic acid, 4-hydroxybenzoic acid, cinnamic acid, and apigenin) were found in the extracts. GC/MS analysis of steam distilled essential oil showed camphor, α-pinene and δ-3-carene as the main constituents. In DPPH radical scavenging assay, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GC/MS; HPLC/TOF-MS; DPPH radical scavenging activity; Metal chelating; MIC.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100405

Volatile profile of yellow passion fruit juice by static headspace and solid phase microextraction techniques
Provedor de dados: 65
Autores: Braga,Gilberto Costa; Prado,Adna; Pinto,Jair Sebastião da Silva; Alencar,Severino Matias de.
The profile of volatile compounds of yellow passion fruit juice was analyzed by solid phase microextraction headspace (HS-SPME) and optimized static headspace (S-HS) extraction techniques. Time, temperature, NaCl concentration and sample volume headspace equilibrium parameters was adjusted to the S-HS technique. The gaseous phase in the headspace of samples was collected and injected into a gas chromatograph coupled to a mass spectrometer. In the HS-SPME technique was identified 44 volatile compounds from the yellow passion fruit juice, but with S-HS only 30 compounds were identified. Volatile esters were majority in both techniques, being identified ethyl butanoate, ethyl hexanoate, (3z)-3-hexenyl acetate, hexyl acetate, hexyl butanoate and hexyl...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis f. flavicarpa Deg.; GC/MS; SPME; HS; Aroma profile.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000200356

1-methylcyclopropene effects on volatile profile and quality of 'Royal Gala' apples produced in Southern Brazil and stored in controlled atmosphere
Provedor de dados: 65
Autores: Thewes,Fabio Rodrigo; Both,Vanderlei; Brackmann,Auri; Ferreira,Daniele de Freitas; Wagner,Roger.
ABSTRACT: Apple volatile aroma depends of complex interaction among organic compounds. The aim of the present study was to evaluate the effect of 1-methylcyclopropene (1-MCP) application on volatile profile and quality on 'Royal Gala' apples produced in Southern Brazil and stored under controlled atmosphere condition (CA; 1.0kPa O2+1.2kPa CO2; 0.5±0.1°C; 94±1% relative humidity). Volatile profile was determined after eight month of CA storage plus 7 days of shelf life via solid-phase microextraction (HS-SPME) and analyzed by gas chromatography coupled to mass spectrometer. In the volatile profile were identified 8 esters, 11 alcohols, 6 aldehydes, 6 acids, 2 ketones, 1 ether and 1 terpene. 1-MCP application reduced significantly the main volatile compounds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica; Solid phase microextraction; Fruits; GC/MS.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001202259