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287 Newest Publications about the topic gas chromatographs

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A bubble-based microfluidic gas sensor for gas chromatographs

04-Nov-2014 | Ashrafuzzaman Bulbul; Hanseup Kim, Lab on a Chip, 2014

We report a new proof-of-concept bubble-based gas sensor for a gas chromatography system, which utilizes the unique relationship between the diameters of the produced bubbles with the gas types and mixture ratios as a sensing element. The bubble-based gas sensor consists of gas and liquid ...

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A Bubble-based Microfluidic Gas Sensor for Gas Chromatographs

15-Oct-2014 | Ashrafuzzaman Bulbul; Hanseup Kim, Lab on a Chip, 2014

We report a new proof-of-concept bubble-based gas sensor for a gas chromatography system, which utilizes the unique relationship between the diameters of the produced bubbles to the gas types and mixture ratios as a sensing element. The bubble-based gas sensor consists of gas and liquid channels ...

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Analysis and Sensory Evaluation of Jostaberry (Ribes x nidigrolaria Bauer) Volatiles

11-Sep-2013 | Katrin Hempfling; Oxana Fastowski; Johanna Celik; Karl-Heinz Engel, Journal of Agricultural and Food Chemistry, 2013

Volatiles of jostaberries (Ribes x nidigrolaria Bauer)—a hybrid of black currant (Ribes nigrum L.) and gooseberry (Ribes uva-crispa L.)—were isolated via vacuum headspace extraction and analyzed by capillary gas chromatographic methods for the first time. (E)-Hex-2-enal, (E)-hex-2-en-1-ol, ...

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Integrating reaction and analysis: investigation of higher-order reactions by cryogenic trapping

10-Sep-2013 | Skrollan Stockinger and Oliver Trapp, Beilstein Journal of Organic Chemistry, 2013

Abstract A new approach for the investigation of a higher-order reaction by on-column reaction gas chromatography is presented. The reaction and the analytical separation are combined in a single experiment to investigate the Diels–Alder reaction of benzenediazonium-2-carboxylate as a benzyne ...

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The Syntheses of α‐Bis and α,ω‐Tetrakis(4‐aminophenyl) Functionalized Polymers using 1,1‐Bis(4‐aminophenyl)ethylene in Atom Transfer Radical Polymerization Reactions

03-Sep-2013 | Gabriel J Summers, Mzikayise P Ndawuni, Carol A Summers, Polymer International, 2013

Abstract The preparation of a symmetrically disubstituted 1,1‐diphenylethylene derivative, 1,1‐bis(4‐aminophenyl)ethylene by the Wittig reaction as well as the preparation of primary amine chain end functionalized polymers using 1,1‐bis(4‐aminophenyl)ethylene in atom transfer radical ...

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Identification of 24-n-propylidenecholesterol in a member of the Foraminifera

02-Sep-2013 | Author(s): Jonathan Grabenstatter , Sabine Méhay , Anna McIntyre-Wressnig , José-Luis Giner , Virginia P. Edgco ..., Organic Geochemistry, 2013

Publication date: Available online 29 August 2013 Source:Organic Geochemistry Author(s): Jonathan Grabenstatter , Sabine Méhay , Anna McIntyre-Wressnig , José-Luis Giner , Virginia P. Edgcomb , David J. Beaudoin , Joan M. Bernhard , Roger E. Summons We report a study of the sterols ...

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Method to predict gas chromatographic response factors for the trace‐level analysis of volatile organic compounds based on the effective carbon number concept

21-Aug-2013 | Jan E. Szulejko, Yong‐Hyun Kim, Ki‐Hyun Kim, Journal of Separation Science, 2013

A procedure has been developed to estimate GC–MS response factors based on the theory of effective carbon number defined as the sum of the carbon number and carbon number equivalent for each selected molecular descriptor (multiplied by its number of occurrences) in each compound's molecular ...

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Molecules, Vol. 18, Pages 10024-10041: Volatile Aroma Compounds in Various Brewed Green Teas

20-Aug-2013 | Lee, Jeehyun ; Chambers, Delores H.; Chambers, Edgar ; Adhikari, Koushik ; Yoon, Youngmo, Molecules, 2013

This study identifies and semi-quantifies aroma volatiles in brewed green tea samples. The objectives of this study were to identify using a gas chromatograph-mass spectrometer (GC-MS) paired with a headspace solid-phase micro-extraction (HS-SPME) the common volatile compounds that may be ...

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Laser induced H2 production employing Pt-TiO2 photocatalysts

19-Aug-2013 | Author(s): Anzel Falch , Roelof J. Kriek, Journal of Photochemistry and Photobiology A: Chemistry, 2013

Publication date: Available online 17 August 2013 Source:Journal of Photochemistry and Photobiology A: Chemistry Author(s): Anzel Falch , Roelof J. Kriek The photocatalytic production of hydrogen from water as well as from an aqueous methanol solution employing pre-treated TiO2 and ...

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Rapid Determination of Total Acid Content of Oils Resulting from Sub/Supercritical Water Liquefaction of Lignite by Headspace Gas Chromatography

15-Aug-2013 | Qingqing Guan; Huihui Chen; Ping Ning; Senlin Tian; Junjie Gu; Hui-Chao Hu; Xin-Sheng Chai, Energy & Fuels, 2013

This paper reports a headspace gas chromatographic method (HS-GC) for the rapid determination of the total acid content of oils resulting from sub/supercritical water liquefaction of lignite. Acids in the oil react with added bicarbonate solution to release carbon dioxide (CO2), which is ...

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