Enantioselective multidimensional gas chromatography

The design has been well proved in quality assurance and origin control of flavours and fragrances. A double-oven system is shown in the Fig. 17.3, with two independent temperature controls and two detectors (DM 1, DM 2). A live switching coupling piece is used to switch the effluent flow to either the first detector or the chiral column. With optimum pneumatic adjustment of the MDGC system, certain fractions are selectively transferred onto the chiral main column as they are eluted from the precolumn (heart-cutting technique) [15]. [Pg.383]

V. Schubert, R. Diener and A. Mosandl, Enantioselective multidimensional gas chromatography of some secondary alcohols and their acetates from banana , Z C. Naturforsch. C. 46 33-36 (1991). [Pg.245]

Figure 15.8 Multidimensional GC-MS separation of urinary acids after derivatization with methyl chloroformate (a) pre-column cliromatogram after splitless injection (h) Main-column selected ion monitoring cliromatogram (mass 84) of pyroglutamic acid methyl ester. Adapted from Journal of Chromatography, B 714, M. Heil et ai, Enantioselective multidimensional gas chromatography-mass spectrometry in the analysis of urinary organic acids , pp. 119-126, copyright 1998, with permission from Elsevier Science.

Authenticity evaluation has recently received increased attention in a number of industries. The complex mixtures involved often require very high resolution analyses and, in the case of determining the authenticity of natural products, very accurate determination of enantiomeric purity. Juchelka et al. have described a method for the authenticity determination of natural products which uses a combination of enantioselective multidimensional gas chromatography with isotope ratio mass spectrometry (28). In isotope ratio mass spectrometry, combustion analysis is combined with mass spectrometry, and the ratio of the analyte is measured versus a... [Pg.422]

Fig. 17.3 Enantioselective multidimensional gas chromatography (enantio-MDGC), Live-T column switching, Siemens Sichromat [52]...

Stir-Bar Sorptive Extraction-Enantioselective Multidimensional Gas Chromatography-Mass Spectrometry... [Pg.390]

A Enantioselective multidimensional gas chromatography (MDGC)-mass spectrometry (MS), B gas chromatography (GC)-isotope ratio mass spectrometry (IRMS) multielement analysis (5 C, values), C enantiomeric purity (%), D total percentage (%)... [Pg.393]

Kreis, P. and Mosandl, A. 1992. Chiral compounds of essential oils. Part XII. Authenticity control of rose oils, using enantioselective multidimensional gas chromatography. Flavour Fragrance J. 7 199-203. [Pg.1043]

In particular, enantioselective multidimensional gas chromatography (enantio-MDGC) with the combination of a non-chiral precolumn and a chiral main column... [Pg.665]

Fig. 6.24 Schematic diagram of enantioselective multidimensional gas chromatography, according to ref [28]...

The innovations in Es-GC analysis have not only concerned the development and applications of distinct CSPs, but also the development of distinct enantioselective analytical techniques, such as Es-GC-mass spectrometry (Es-GC/MS), Es-GC-0, enantioselective multidimensional gas chromatography (Es-MDGC), Es-MDGC/MS, Es-GC hyphenated to isotopic ratio mass spectrometry (Es-GC/IRMS), Es-MDGC/IRMS, and so on. [Pg.165]

Glausch, A., Blanch, G.P., Schurig, V. (1996). Enantioselective analysis of chiral polychlorinated biphenyls in sediment samples by multidimensional gas chromatography-electron-capture detection after steam distillation-solvent extraction and sulfur removal. J. Chromatogr. A 723, 399 104. [Pg.341]

A. Glausch, J. Hahn and V. Schurig, Enantioselective determination of chiral 2,2, 3,3, 4,6-hexachlorobiphenyl (PCB 132), in human milk samples by multidimensional gas chromatography/electron capture detection and by mass spectrometry , Chemosphere 30 2079-2085 (1995). [Pg.430]

Lorenzo D, Paz D, Davies P, ViUamil J, Vila R, Canigueral S, Dellacassa E. Application of multidimensional gas chromatography to the enantioselective characterisation of the essential oil of Eupatorium buniifolium Hooker et Arnott. Phytochem. Anal. 2005 16 39-44. [Pg.1626]

E. Podehrad, M. Heil, S. Leih, B. Geier, T. Beck, A. Mosandl, A. C. Sewell and H. Bohles, Analytical approach in diagnosis of inherited metabolic diseases maple syrup urine disease (MSUD)-simultaneous analysis of metabolites in urine by enantioselective multidimensional capillary gas chromatography-mass specti ometiy (enantio-MDGC-MS) , 7. High Resolut. Chromatogr. 20 355-362(1997). [Pg.430]

Polychlorobiphenyls were recovered from sediments in another investigation by steam distillation/solvent extraction, followed by enantioselective analysis using multidimensional electron capture gas chromatography [189]. [Pg.107]

A. Bemreuther, V. Lander, M. Huffer and P. Schreier. Enantioselective Analysis of Dec-2-en-5-oUde (MassoUactone) from Natural Sources by Multidimensional Capillary Gas Chromatography. Flav. Fragr. J., 5, 71-73 (1990). [Pg.699]

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