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36 Newest Publications about the topic gc accessories

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Optimizing chromatographic resolution for simultaneous quantification of long chain alkenones, alkenoates and their double bond positional isomers

02-Jul-2017 | Author(s): Yinsui Zheng, Rafael Tarozo, Yongsong Huang, Organic Geochemistry, 2017

Publication date: Available online 1 July 2017 Source:Organic Geochemistry Author(s): Yinsui Zheng, Rafael Tarozo, Yongsong Huang We here report our latest attempt to optimize gas chromatographic (GC) separation of long chain alkenones and alkenoates from the haptophyte cultures and ...

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The influence of different referencing methods on the accuracy of δ13C value measurement of ethanol fuel by gas chromatography/combustion/isotope ratio mass spectrometry

30-Sep-2015 | Laura A. Neves, Janaína M. Rodrigues, Romeu J. Daroda, Paulo R. M. Silva, Alexandre A. Ferreira, Donato A. G. Aranda ..., Rapid Communications in Mass Spectrometry, 2015

Rationale Brazil is the largest producer of sugar cane bioethanol in the world. Isotope ratio mass spectrometry (IRMS) is the technique of choice to certify the origin/raw materials for ethanol production, but the lack of certified reference materials (CRMs) for accurate measurements of δ13C ...

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Polymerized Phosphonium-Based Ionic Liquids as Stationary Phases in Gas Chromatography: Performance Improvements by Addition of Graphene Oxide

03-Sep-2015 | Jaime González-Álvarez; Pilar Arias Abrodo; Marcos Puerto; Maialen Espinal Viguri; Julio Perez; Maria Dolores Gutiér ..., New Journal of Chemistry, 2015

Eight new functionalized, polymerizable phosphonium ionic liquids were prepared and applied as polymeric stationary phases in gas chromatography (GC). These coated GC columns exhibit high thermal stability compared to other ionic liquids (220-380ºC), and column efficiencies between 2700 and 3700 ...

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High-Resolution Fractionation after Gas Chromatography for Effect-Directed Analysis

22-Aug-2013 | Eelco Pieke; Ferry Heus; Jorke H. Kamstra; Marija Mladic; Martin van Velzen; Dik Kamminga; Marja H. Lamoree; Timo Ha ..., Analytical Chemistry, 2013

This research presents an analytical technology for highly efficient, high-resolution, and high-yield fractionation of compounds after gas chromatography (GC) separations. The technology is straightforward, does not require sophisticated cold traps or adsorbent traps, and allows collecting large ...

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Zingiberenol, (1S,4R,1′S)-4-(1′,5′-Dimethylhex-4′-enyl)-1-methylcyclohex-2-en-1-ol, Identified as the Sex Pheromone Produced by Males of the Rice Stink Bug Oebalus poecilus (Heteroptera: Pentatomidae)

06-Aug-2013 | Márcio Wandré Morais de Oliveira; Miguel Borges; Carlos Kleber Zago Andrade; Raul Alberto Laumann; José Alexandre Fr ..., Journal of Agricultural and Food Chemistry, 2013

Bioassays using an olfactometer showed that Oebalus poecilus males produce the sexual pheromone, and the chemical analysis demonstrated that this compound is zingiberenol. Two groups of isomers, each containing four diastereoisomers, (1RS,4RS,1′S)- and (1RS,4RS,1′R)-zingiberenol, were prepared. ...

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Identification of a Fossil Sterane Biomarker in Crude Oil – an Androstane with a Modified Carbon Skeleton

26-Jul-2013 | Matthias Bender, Marc Schmidtmann, Jürgen Rullkötter, Roger E. Summons, Jens Christoffers, European Journal of Organic Chemistry, 2013

Abstract Three constitutional isomers of androstane were prepared for comparison with three unknown fossil C19H32 organic biomarkers (“19A”, “19B”, and “19C” in elution order) in geological samples from Oman. 3β‐Methyl‐A‐nor‐androstane was prepared in six steps (8 % overall yield) from ...

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Characterization of Low-Temperature Cofired Ceramic Tiles as Platforms for Gas Chromatographic Separations

21-May-2013 | Ernest Darko; Kevin B. Thurbide; Geoff C. Gerhardt; Joseph Michienzi, Analytical Chemistry, 2013

A gas chromatography (GC) column is fabricated within a low-temperature cofired ceramic (LTCC) tile, and its analytical properties are characterized. By using a dual-spiral design, a 100 μm wide square channel up to 15 m in length is produced within an 11 cm × 5.5 cm LTCC tile. The channel is ...

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GC models for separation optimization in pressure‐tuneable tandem capillary columns operated isothermally. Part 1: theoretical aspects

03-May-2013 | Enrico Veschetti, Ivan Notardonato, Pasquale Avino, Mario Vincenzo Russo, Journal of Separation Science, 2013

GC column selectivity can be continuously adapted to suit analytical needs using a flow‐tuneable tandem system. Its application to the separation of complex mixtures requires a deep understanding of the theory in this area. Although a number of researchers have developed specific models, a ...

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Establishing the Maximum Carbon Number for Reliable Quantitative Gas Chromatographic Analysis of Heavy Ends Hydrocarbons. Part 2. Migration and Separation Gas Chromatography Modeling

26-Mar-2013 | Diana M. Hernandez-Baez; Alastair Reid; Antonin Chapoy; Bahman Tohidi; Roda Bounaceur, Energy & Fuels, 2013

Reservoir fluid characterization by high-temperature gas chromatography (HTGC) extends the range of single carbon number (SCN) groups in oil analyses by temperature programming up to 450 °C. However, the reliability of HTGC analyses is questionable for two main reasons: first, possible pyrolysis ...

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Separation of Fatty Acid Methyl Esters by GC-Online Hydrogenation × GC

11-Jan-2013 | Pierluigi Delmonte; Ali Reza Fardin-Kia; Jeanne I. Rader, Analytical Chemistry, 2013

The separation of fatty acid methyl esters (FAME) provided by a 200 m × 0.25 mm SLB-IL111 capillary column is enhanced by adding a second dimension of separation (2D) in a GC × GC design. Rather than employing two GC columns of different polarities or using different elution temperatures, the ...

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