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Showing 1-30 of 37 results for "packed gc columns" within Papers
Yoshiyuki Mochida et al.
Journal of oleo science, 58(9), 461-466 (2009-08-06)
The analysis or preparative isolation of a specimen by a packed column gas chromatograph is affected by the kind and amount (concentration) of the liquid phase coated on the stationary phase. In particular, compounds having the same or similar molecular
C Szopa et al.
Journal of chromatography. A, 904(1), 73-85 (2001-02-24)
Considering the severe constraints of space instrumentation, a great improvement for the in situ gas chromatographic (GC) determination of permanent and noble gases in a cometary nucleus is the use of a new carbon molecular sieve porous layer open tubular
Janghyeon Lee et al.
Sensors (Basel, Switzerland), 19(17) (2019-08-29)
Gas chromatography (GC) is the chemical analysis technique most widely used to separate and identify gas components, and it has been extensively applied in various gas analysis fields such as non-invasive medical diagnoses, indoor air quality monitoring, and outdoor environmental
A S Christophersen et al.
Journal of analytical toxicology, 12(3), 147-149 (1988-05-01)
When blood stored in glass vials sealed with natural rubber septums was screened for amphetamine, a contaminant was seen. The contamination originated from the rubber septums and was identified by GC/MS as N-ethylbenzenamine. Like amphetamine, N-ethylbenzenamine was extracted from strongly
John M Kokosa et al.
Journal of chromatography. A, 983(1-2), 205-214 (2003-02-06)
The primary standard test method used for the determination of gasoline diluent in used engine oils is method D 3525-93 of the American Society for Testing and Materials (ASTM), which involves direct injection of used oil onto a packed GC
V Lopez-Avila et al.
Journal of chromatographic science, 25(7), 286-291 (1987-07-01)
Two wide-bore capillary columns are evaluated for their applicability to the purge-and-trap technique and GC/MS analysis of 34 volatile organics. Neither column is able to completely resolve all 34 compounds, as is also typical of the packed column; however, the
G H Dodo et al.
Journal of chromatography. A, 859(2), 235-240 (1999-11-26)
Liquid chromatography columns of 100% polydivinylbenzene (DVB) (packing) were used to remove lipid material from fish extracts before analysis of several semivolatile organic pollutants by gas chromatography-mass spectrometry (GC-MS). This packing material was found to be durable as the columns
H Diserens
Journal - Association of Official Analytical Chemists, 72(6), 991-993 (1989-11-01)
In the proposed method, a light petroleum solution of lanolin (wool fat) is adsorbed on diatomaceous earth in an Extrelut column, and the pesticides are eluted with acetonitrile saturated with light petroleum. After evaporation to a small volume, the extract
Frank David et al.
Talanta, 165, 201-210 (2017-02-06)
Two low-pressure columns (Bio-Beads SX-3) and three high-pressure GPC columns were compared for clean-up of a wide range of pesticides in fatty matrices of vegetable or animal origin. The GPC fractions were analyzed by GC-MS/MS and LC-MS/MS without additional clean-up.
Stéphanie Heuskin et al.
Journal of chromatography. A, 1216(14), 2768-2775 (2008-10-28)
The chemical composition of Matricaria chamomilla L. and Nepeta cataria L. essential oils was determined by GC-MS on an apolar stationary phase by comparison of the characteristic fragmentation patterns with those of the Wiley 275L database. The GC-MS chromatograms were
Rosa Palagano et al.
Foods (Basel, Switzerland), 9(7) (2020-07-18)
The content of fatty acid ethyl esters (FAEEs) is one of the quality parameters to define if an olive oil can be classified as extra virgin as these compounds are considered markers for virgin olive oils obtained from poor-quality olives.
Keiko Iwakoshi et al.
Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan, 57(5), 150-154 (2016-10-28)
Rapid multi-residue analysis of pesticides in pulses was developed using LC-MS/MS. Pesticide residues in 5 g of homogenized pulses were extracted with 30 mL of acetonitrile and salted out with 4 g of anhydrous magnesium sulfate and 2 g of
Laiguo Chen et al.
Journal of chromatography. A, 1274, 36-43 (2013-01-05)
Accurately quantifying short chain chlorinated paraffins (SCCPs) in soil samples with gas chromatograph coupled with electron capture negative ionization mass spectrometry (GC-ECNI-MS) is difficult because many other polychlorinated pollutants are present in the sample matrices. These pollutants (e.g., polychlorinated biphenyls
M S Bathala et al.
Journal of pharmaceutical sciences, 73(3), 340-344 (1984-03-01)
A sensitive, quantitative gas chromatographic-electron capture (GC-EC) method for the determination of captopril in blood and captopril and its disulfide metabolites (collectively) in plasma was developed. After addition of an internal standard and N-ethylmaleimide to the biological samples, excess N-ethylmaleimide
Lingling Liu et al.
Journal of oleo science, 66(9), 981-990 (2017-08-11)
An offline solid-phase extraction (SPE) approach combined with a large-volume injection (LVI)-gas chromatography-flame ionization detector (LVI-GC-FID) is improved for routine analysis of mineral oil saturated hydrocarbons (MOSH) in vegetable oils. The key procedure of the method consists in using offline
Yingjie Li et al.
Journal of chromatography. A, 1497, 127-134 (2017-04-04)
Polycyclic aromatic hydrocarbons (PAHs) are present in petroleum based products and are combustion by-products of organic matters. Determination of levels of PAHs in the indoor environment is important for assessing human exposure to these chemicals. A new short path thermal
J Malavia et al.
Journal of chromatography. A, 1056(1-2), 171-178 (2004-12-15)
Gas chromatography coupled with ion trap tandem mass spectrometry (GC-MS-MS) has been compared to gas chromatography-high-resolution mass spectrometry (GC-HRMS) for the analysis of non-ortho-chlorinated biphenyl (CB) congeners in fish samples. The MS-MS operating parameters related to the isolation and fragmentation
R E Aderjan et al.
Journal of analytical toxicology, 17(1), 51-55 (1993-01-01)
A method for the simultaneous detection and quantification of cocaine and benzoylecgonine from human blood and urine has been developed. Cocaine and benzoylecgonine were extracted from blood and urine with solid-phase columns containing C18 packing material. Clean, emulsion-free extracts were
S R Sousa et al.
Analytical chemistry, 69(19), 3871-3878 (1997-10-01)
The relative electron capture detector (ECD) response to alternative fluorocarbons (AFCs) using gas chromatography are found to be at least 1 order of magnitude lower than that for CFC-12. Detection limits for the chlorofluorocarbons CFC-12, HCFC-22, HCFC-123, and HCFC-124 are
A Tavakkol et al.
Journal of chromatography, 274, 37-44 (1983-05-13)
Columns of Chromosorb 103, Tenax-GC, Amine 220 plus potassium hydroxide on Chromosorb W, and Carbowax 20M plus potassium hydroxide on Chromosorb W were compared for their ability to separate bacterial amines as their free bases in aqueous solution. A 1.52
Tanyaradzwa E Mungure et al.
Foods (Basel, Switzerland), 9(1) (2020-01-18)
The present study investigated the effect of processing parameters comprising rigor temperature, ageing and display time on conjugated linoleic acid (CLA) concentrations, stability and the development of cholesterol oxidation products in hot boned beef semimembranosus muscles. Meat samples, having attained
I P Nnane et al.
Xenobiotica; the fate of foreign compounds in biological systems, 29(11), 1101-1113 (1999-12-22)
1. Gas chromatographic (GC) methods for the analysis of ethyl methyl sulphide (EMS) and its corresponding sulphoxide (EMSO) and sulphone (EMSO2) in rat microsomes and aspects of the in vitro metabolism of EMS and EMSO are described. 2. EMS and
T W Lee
Journal - Association of Official Analytical Chemists, 70(4), 702-705 (1987-07-01)
A method has been developed for the quantitative determination of linoleic acid in infant formulas by gas chromatography (GC). A known amount of triheptadecanoin was spiked into the sample. Total lipid was extracted from the product by an ethyl ether-petroleum
Ali Poormohammadi et al.
Journal of chromatography. A, 1527, 33-42 (2017-11-02)
Carbotrap B as a highly pure surface sorbent with excellent adsorption/desorption properties was packed into a stainless steel needle to develop a new needle trap device (NTD). The performance of the prepared NTD was investigated for sampling, pre-concentration and injection
P Fernández et al.
Journal of applied toxicology : JAT, 26(3), 253-257 (2006-01-04)
Gas chromatography was used in combination with flame ionization detection (GC-FID) to develop a method for determining cocaine and its two metabolites, benzoylecgonine (BEG) and ecgonine methyl ester (EME), in bile and vitreous humor. The method used a 12 m
Md Mahmudur Rahman et al.
Journal of chromatography. A, 1314, 241-248 (2013-09-28)
An experimental technique based on sorbent tube-thermal desorption-gas chromatography (ST-TD-GC) was investigated for the simultaneous determination of a cluster of eight volatile odorants (propionic acid, n-butyric acid, i-valeric acid, n-valeric acid, trimethylamine, phenol, indole, and skatole) and a reference compound
Shang-mei Shi et al.
Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica, 27(3), 170-173 (2003-05-31)
To analyse the chemical components of the essential oil of Gum olibanum somalilnds and Gum olibanum Ethiopia, and to set up determination methods of their main components. Two kinds of essential oil are identified by GC-MS, and assayed by Gas
K Nakamura et al.
Investigative ophthalmology & visual science, 31(10), 2059-2069 (1990-10-01)
Silicone oil (SiO) and fluorosilicone oil (FSiO) are useful in difficult cases of retinal detachment surgery. Unidentified low-molecular-weight components (LMWC) and residual catalysts in SiO and FSiO have been implicated in the adverse reactions of the oils in the eye.
Otmar Geiss et al.
Journal of chromatography. A, 1566, 13-22 (2018-06-28)
Polycyclic Aromatic Hydrocarbons (PAHs) have been detected in rubber and plastic components of a number of consumer products such as toys, tools for domestic use, sports equipment, and footwear, with carbon black and extender oils having been identified as principal
Chia Jung Lu et al.
The Analyst, 127(8), 1061-1068 (2002-08-28)
A small multi-adsorbent preconcentration/focusing module for a portable GC with microsensor-array detector designed to determine complex mixtures of volatile and semi-volatile organic compounds encountered in indoor working environments is described. Candidate adsorbents were assessed on the basis of analyte thermal-desorption
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