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J Chromatogr A

Title:		Enantiomeric separation of volatile organics by gas chromatography for the in situ analysis of extraterrestrial materials: kinetics and thermodynamics investigation of various chiral stationary phases
Author(s):		Freissinet C; Buch A; Szopa C; Sternberg R;
Address:		"Laboratoire de Genie des Procedes et Materiaux (LGPM), Ecole Centrale Paris, 92295 Chatenay-Malabry, France. caroline.freissinet@nasa.gov"
Journal Title:		J Chromatogr A
Year:		2013
Volume:		20130719
Issue:
Page Number:		59 - 71
DOI:		10.1016/j.chroma.2013.07.058
ISSN/ISBN:		1873-3778 (Electronic) 0021-9673 (Linking)
Abstract:		"The performances of several commercial chiral capillary columns have been evaluated with the aim of determining the one most suitable for enantiomeric separation in a gas chromatograph onboard a space probe. We compared the GC-MS response of three capillary columns coated with different chiral stationary phases (CSP) using volatile chiral organic molecules which are potential markers of a prebiotic organic chemistry. The three different chiral capillary columns are Chirasil-Val, with an amino acid derivative CSP, ChiralDex-beta-PM, with a CSP composed of dissolved permethylated beta-cyclodextrins in polysiloxane, and Chirasil-Dex, with a CSP made of modified cyclodextrins chemically bonded to the polysiloxane backbone. Both kinetics and thermodynamics studies have been carried out to evaluate the chiral recognition potential in these different types of columns. The thermodynamic parameters also allow a better understanding of the driving forces affecting the retention and separation of the enantiomers. The Chirasil-Dex-CSP displays the best characteristics for an optimal resolution of the chiral compounds, without preliminary derivatization. This CSP had been chosen to be the only chiral column in the Sample Analysis at Mars (SAM) experiment onboard the current Mars Science Laboratory (MSL) mission, and is also part of the Mars Organic Molecules Analyzer (MOMA) gas chromatograph onboard the next Martian mission ExoMars. The use of this column could also be extended to all space missions aimed at studying chirality in space"
Keywords:		Exobiology/instrumentation/*methods Gas Chromatography-Mass Spectrometry/instrumentation/*methods Kinetics Mars Stereoisomerism Thermodynamics Volatile Organic Compounds/*chemistry Chirality Space analysis Volatile organics;
Notes:		"MedlineFreissinet, C Buch, A Szopa, C Sternberg, R eng Evaluation Study Netherlands 2013/08/08 J Chromatogr A. 2013 Sep 6; 1306:59-71. doi: 10.1016/j.chroma.2013.07.058. Epub 2013 Jul 19"