Results 31 to 40 of about 208,364 (208)

Chirale stationäre Phasen mit (+)-(R)-N-(1-Phenylethyl)-N?-[3-(diethoxymethylsilyl)propyl]harnstoff für die direkte Enantiomerentrennung mit Kapillargaschromatographie und überkritischer Fluidchromatographie

open access: yesCHIMIA, 1991
Five different polymer stationary phases with (+)-(R)-N-(1-phenylethyl)-N?-[3-(diethoxymethylsilyl)propyl]urea as the chiral selector have been synthesized and tested for direct enantiomer separation in capillary gas and supercritical fluid ...
André Marti   +3 more
doaj   +2 more sources

Chemical Analysis of the Herbal Medicine Salviae miltiorrhizae Radix et Rhizoma (Danshen)

open access: yesMolecules, 2016
Radix Salviae miltiorrhizae et Rhizoma, known as Danshen in China, is one of the most popular traditional Chinese medicines. Recently, there has been increasing scientific attention on Danshen for its remarkable bioactivities, such as promoting blood ...
Hanqing Pang   +5 more
doaj   +1 more source

Synthesis and stereochemical determination of diunsaturated valproic acid analogs including its major diunsaturated metabolite.

open access: yesJournal of Lipid Research, 1985
Valproic acid, an antiepileptic drug, is transformed into diunsaturated metabolites in humans. Synthesis of the geometric isomers of 2-(1'-propenyl)-2-pentenoic acid and 2-(1'-propenyl)-3-pentenoic acid was attempted using known procedures.
A Acheampong, F S Abbott
doaj   +1 more source

Quantitation and organic geochemical characterization of petroleum-like materials found on an undisturbed beach of the Padre Island National Seashore [PDF]

open access: yes, 1980
On June 3, 1979 the IXTOC I well in the Bay of Campeche 'blew out' with the subsequent release of 3 to 4 million barrels of oil. A major portion of that oil is known to have escaped recovery or was deliberately dispersed into the environment.
Scalan, Richard S., Winters, J. Kenneth
core   +1 more source

Determination_of D003 by capillary gas chromatography

open access: yesRevista CENIC Ciencias Químicas, 2002
D003 is a mixture of saturated very long-chain fatty acids ranging from 24 to 36 carbon atoms, obtained from sugar cane (Saccharum officinarum L.) wax, with antiplatelet, 'antithrombotic, antioxidant and cholesterol-lowering effects .
David Marrero Delange   +4 more
doaj  

Studies on changes in patterns of fatty acids, sterols and tocopherols of oil during seed maturation of oil crops. Part I. Sunflower seeds

open access: yesGrasas y Aceites, 1994
The variation of lipid constituents in maturing sunflower oil seeds has been investigated with the aim of determination of the proper harvesting time as well as the oil quality.
S. M. El-Shami   +3 more
doaj   +1 more source

Physiology of Chatham Island forget-me-not (Myosotidium hortensia) seed : a thesis presented in partial fulfilment of the requirements for the degree of Master of Applied Science in Seed Science and Technology at Massey University [PDF]

open access: yes, 2003
Chatham Island forget-me-not (Myosotidium hortensia (Decne) Baillon) is endemic to the Chatham Islands where it is mainly confined to the outer islands. There is speculation that seed of M.
McGill, Craig Robert
core  

MULTICOMPONENT DETERMINATION OF ORGANOCHLORINATED COMPOUNDS IN MILK BY GAS CHROMATOGRAPHY WITH ELECTRON-CAPTURE DETECTION AFTER LIQUID-LIQUID EXTRACTION

open access: yesAgricultura, 2009
This paper reports a multiresidue analytical method based on liquid-liquid extraction and capillary gas chromatography with electron-capture detection (LLE-GC-ECD). The determined analytes belong to two organochlorinated compound classes: polychlorinated
Mirela Miclean   +4 more
doaj   +1 more source

PENENTUAN KADAR KOLESTEROL DENGAN METODE KROMATOGRAFI GAS

open access: yesAgrointek, 2016
The methods for quantitative determination of cholesterol in foods by chromatography determination Two types of lipid classes including free cholesterol and cholesterol ester exist in food.
Laila Khamsatul Muharrami
doaj  

Capillary electrochromatography applied to the separation of enantiomers utilizing packed capillary columns with silica-vancomycin. A tutorial

open access: yesJournal of Chromatography Open
The separation and analysis of chiral compounds is an important topic in various fields such as research, pharmaceutical industry, food control, agrochemistry, biochemistry, forensics and toxicology, etc.
Chiara Fanali, Giovanni D'Orazio
doaj   +1 more source

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