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Showing 1-22 of 22 results for "24077" within Papers
T Mirza et al.
Journal of pharmaceutical and biomedical analysis, 17(8), 1427-1438 (1998-11-04)
Camphor and m-cresol mixtures are used in antiseptic and anti-itching creams. No compendial method exists for these preparations. This paper reports a capillary gas chromatographic method using FID detection with 2,6-di-tert-butyl-4-methylphenol as internal standard on a 30 m x 0.32
L W Getzin et al.
Journal - Association of Official Analytical Chemists, 72(2), 361-364 (1989-03-01)
A method for extraction, cleanup, and simultaneous gas chromatographic detection of carbofuran, metalaxyl, and simazine in soils has been developed. Pesticide residues were extracted from soil with acetone containing 10% 0.2M HCl-KCl buffer (pH 2.0), cleaned up with methylene chloride-carbonate
Leandro W Hantao et al.
Analytical chemistry, 86(8), 3717-3721 (2014-03-13)
In this study, a series of ionic liquids (ILs) are evaluated as stationary phases in comprehensive two-dimensional gas chromatography (GC × GC) for the separation of aliphatic hydrocarbons from kerosene. IL-based stationary phases were carefully designed to evaluate the role
Peter Korytár et al.
Journal of chromatography. A, 958(1-2), 203-218 (2002-07-24)
Comprehensive two-dimensional gas chromatography (GC x GC) with micro electron-capture detection (microECD) has been optimised for the separation of polychlorinated biphenyl congeners with emphasis on the separation of 12 toxic non- and mono-ortho chlorinated biphenyls (CBs), viz. CBs 77, 81
Yonghong Zhu et al.
Food chemistry, 109(4), 899-908 (2008-08-15)
A gas chromatography electron capture detector (GC-ECD) using the standard addition method was developed for the determination of acrylamide in heat-processed foods. The method entails extraction of acrylamide with water, filtration, defatting with n-hexane, derivatization with hydrobromic acid and saturated
J J Myher et al.
Journal of biochemical and biophysical methods, 15(2), 111-121 (1987-11-01)
The 5 alpha-stanol-3 beta-ol analogs of cholesterol, campesterol and beta-sitosterol along with many other sterol types were resolved using a Supelcowax 10 (Bonded Carbowax PEG 20M) fused silica capillary column (15 m x 0.25 mm). Unlike non-polar capillary columns, the
Luisa R Bordajandi et al.
Journal of chromatography. A, 1078(1-2), 128-135 (2005-07-13)
The feasibility of comprehensive two-dimensional gas chromatography with electron-capture detection (GC x GC-ECD) for the enantioseparation of chiral PCBs from other possible interfering compounds has been evaluated. Three commercially available enantioselective beta-cyclodextrin-based capillary columns (Chirasil-Dex, BGB-172 and BGB-176SE) have been
Andréa Figueiredo Procópio de Moura et al.
Archivos latinoamericanos de nutricion, 52(2), 207-211 (2002-08-20)
The objective of this study was to describe the fresh cooled pink-shrimp (Penaeus brasiliensis and Penaeus paulensis) lipid. The total lipid content was 1.13 +/- 0.09 g/100 g while fatty acid profile showed 32.9% saturated, 20.4% monounsaturated and 40.5% polyunsaturated.
Mostofa Jamal et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 798(1), 155-158 (2003-11-25)
The subject of the present paper is the simultaneous determination of ethanol (EtOH) and acetaldehyde (AcH) concentrations in the striatum of freely moving rats using an in vivo microdialysis followed by head-space gas chromatography (GC). Major operation conditions of GC
John K G Kramer et al.
Lipids, 37(8), 823-835 (2002-10-10)
Milkfat is a complex mixture of many diverse FA, some of which have demonstrated health benefits including anticancer properties. Attempts are under way to enrich milkfats with long-chain n-3 PUFA and CLA. It has been recommended that the analysis of
Sung-Tong Chin et al.
Chirality, 26(11), 747-753 (2014-01-15)
Chiral comprehensive two-dimensional gas chromatography (eGC×GC) coupled to quadrupole-accurate mass time-of-flight mass spectrometry (QTOFMS) was evaluated for its capability to report the chiral composition of several monoterpenes, namely, α-pinene, β-pinene, and limonene in cardamom oil. Enantiomers in a standard mixture
Tomás Cajka et al.
Journal of separation science, 30(4), 534-546 (2007-04-21)
Head-space solid phase microextration (SPME), followed by comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GCxGC-TOFMS), has been implemented for the analysis of honey volatiles, with emphasis on the optimal selection of SPME fibre and the first- and second-dimension GC capillaries. From
T Mirza et al.
Journal of pharmaceutical and biomedical analysis, 16(6), 939-950 (1998-04-21)
A capillary gas chromatographic method is described for the determination of methenamine hippurate residue in swabs collected from manufacturing equipment surfaces. Any residual methenamine hippurate remaining on process equipment after cleaning is removed by swabbing with one wet polyester Absorbond
J J Ramos et al.
Journal of chromatography. A, 1216(43), 7307-7313 (2009-06-03)
The feasibility of a miniaturised generic sample preparation method based on matrix solid-phase dispersion for the determination of three relevant classes of pesticides (organophosphorus pesticides, triazines and pyrethroids) in selected fruits, i.e. orange, apple, pear and grape, have been demonstrated.
L R Bordajandi et al.
Journal of chromatography. A, 1186(1-2), 312-324 (2007-12-28)
Separations of eight persistent organohalogenated classes of pollutants, organochlorinated pesticides (OCPs), polychlorinated biphenyls (PCBs), polychlorinated diphenyl ethers (PBDEs), polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polychlorinated naphthalenes (PCNs), polychlorinated terphenyls (PCTs) and toxaphene (CTT) by comprehensive two-dimensional gas chromatography (GC x
Vasily I Svetashev et al.
Journal of phycology, 50(2), 322-327 (2014-04-01)
During gas chromatography (GC) analysis of fatty acid (FA) composition of the dinoflagellate Gymnodinium kowalevskii, we found unex-pectedly low and irreproducible content of all-cis-3,6,9,12,15-octadecapentaenoic acid (18:5n-3), which is an important chemotaxonomic marker of several classes of microalgae. We compared chromatographic
Cheng Zhang et al.
Journal of chromatography. A, 1440, 160-171 (2016-02-27)
Structurally-tuned ionic liquids (ILs) have been previously applied as the second dimension column in comprehensive two-dimensional gas chromatography (GC×GC) and have demonstrated high selectivity in the separation of individual aliphatic hydrocarbons from other aliphatic hydrocarbons. However, the maximum operating temperatures
He Nan et al.
Journal of chromatography. A, 1481, 127-136 (2016-12-31)
Lipidic ionic liquids (ILs) possessing long alkyl chains as well as low melting points have the potential to provide unique selectivity as well as wide operating ranges when used as stationary phases in gas chromatography. In this study, a total
Luisa R Bordajandi et al.
Journal of chromatography. A, 1125(2), 220-228 (2006-06-13)
Comprehensive two-dimensional gas chromatography with micro electron-capture detection (GC x GC-microECD) has been evaluated for the enantioseparation of five chiral toxaphenes typically found in real-life samples (Parlar 26, 32, 40, 44 and 50). From the two enantioselective beta-cyclodextrin-based columns evaluated
Viviana Santercole et al.
Lipids, 47(3), 329-344 (2012-01-17)
Commercial fish oils and foods containing fish may contain trans and/or isomerized fatty acids (FA) produced during processing or as part of prepared foods. The current American Oil Chemists' Society (AOCS) official method for marine oils (method Ce 1i-07) is
Benoît Blanchet et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 769(2), 221-226 (2002-05-09)
This article describes two methods for the determination of 1,4-butanediol and gamma-hydroxybutyrate in human plasma and urine using capillary gas chromatography. For 1,4-butanediol, plasma or urine samples (500 microl) were extracted by protein precipitation whereas for gamma-hydroxybutyrate, plasma or urine
A G Tomasselli et al.
European journal of biochemistry, 155(1), 111-119 (1986-02-17)
The complete amino acid sequence of cytosolic adenylate kinase (MgATP + AMP----MgADP + ADP) from baker's yeast has been determined. Tryptic and clostripaic cleavage of the protein yielded 27 and 10 fragments, respectively. They were sequenced with either a solid-phase
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