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Expanding the Knowledge Related to Flavors and Fragrances by Means of Three-Dimensional Preparative Gas Chromatography and Molecular Spectroscopy. SEPARATIONS 2022. [DOI: 10.3390/separations9080202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
As universally known, gas chromatography (GC) coupled with mass spectrometry (MS) allows us to acquire spectra that can be searched in specific databases to attain qualitative information on a peak of interest. When not present in databases, structure elucidation is required before including a new component in a library: from that moment, scientists all around the world will be able to identify the new molecule with analytical confidence after GC-MS analysis. Conversely, if data are not shared in commercial databases, even if a molecule is studied and elucidated, it appears to be unknown or only identifiable on the basis of third-party data taken from the literature, which is a serious limitation. The present paper deals with a case that confirms this assumption. A component of Myrtus communis L. volatile fraction was tentatively identified based on literature data. Despite this, reliable identification could not be achieved due to the lack of a corresponding spectrum in commercial MS databases. Afterwards, the target component was isolated in a reasonable quantity and with a high degree of purity for downstream characterization by spectroscopic techniques. For this purpose, preparative (prep) GC may appear insufficient for the isolation of volatile components from highly complex samples. In this study, a prep-MDGC system was implemented for the isolation of the compound of interest from myrtle oil, consisting of three wide-bore columns of different selectivity coupled by means of Deans switch transfer devices. Based on the NMR and GC-FTIR data acquired, the unknown compound was identified as 2,2,5,5,7,7-hexamethyl-3,7-dihydro-1-benzofuran-4,6(2H,5H)-dione. Noticeably, this is a known molecule, yet its mass spectrum had never been registered into MS databases and thus was not available to the scientific community. Finally, the spectrum was included for the first time in a commercial library, namely the FFNSC 5.0 MS database. The aim of the present study was to highlight the opportunity to make analytical data quickly available in a reliable way by registering them in searchable MS databases to improve the identification means for researchers all over the world.
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Chen H, Li Y, Jiang W, Xiong Y. Determination of carbon isotopic composition of crocetane in sediments by heart-cutting two-dimensional gas chromatography–isotope ratio mass spectrometry. J Chromatogr A 2022; 1666:462878. [DOI: 10.1016/j.chroma.2022.462878] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 02/02/2022] [Accepted: 02/03/2022] [Indexed: 01/04/2023]
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3
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Multidimensional Gas Chromatography in Essential Oil Analysis. Part 1: Technical Developments. Chromatographia 2018. [DOI: 10.1007/s10337-018-3649-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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4
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Zavahir JS, Nolvachai Y, Marriott PJ. Molecular spectroscopy – Information rich detection for gas chromatography. Trends Analyt Chem 2018. [DOI: 10.1016/j.trac.2017.11.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sciarrone D, Pantò S, Donato P, Mondello L. Improving the productivity of a multidimensional chromatographic preparative system by collecting pure chemicals after each of three chromatographic dimensions. J Chromatogr A 2016; 1475:80-85. [PMID: 27863713 DOI: 10.1016/j.chroma.2016.11.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 11/08/2016] [Accepted: 11/10/2016] [Indexed: 11/24/2022]
Abstract
The enhanced sample collection capability of a heart-cutting three-dimensional GC-prep system is reported. In its original configuration, a highly pure component can be usually collected after the last (3D) column outlet by means of a dedicated preparative station. The latter is located after the last chromatographic column, and this poses the requirement for multiple heart cuts even for those components showing satisfactory degree of purity after the first (or second) separation dimension. The feasibility to collect pure components after each chromatographic dimension is here described, employing a three-dimension MDGC system equipped with high-temperature valves, located inside the first and second GC ovens, with the aim to improve the productivity of the collection procedure. In addition to a commercial preparative collector located at the 3D outlet, two laboratory-made collection systems were applied in the first and second dimension, reached by the effluent to be collected trough a high-temperature valve switching the heart-cut fraction between either the detector (FID), or the collector. Highly pure sesquiterpene components were collected, namely: patchouli alcohol after the first column [poly(5% diphenyl/95% dimethylsiloxane)], α-bulnesene after a second column coated with high molecular weight polyethylene glycol, and α-guaiene after an ionic-liquid based column (SLB-IL60), used as the third dimension. Purity levels ranging from 85 to 95% were achieved with an average collection recovery of 90% (n=5). The following average amounts were collected per run: 160μg for α-guaiene, 295μg for α-bulnesene, and 496μg for patchouli alcohol.
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Affiliation(s)
- Danilo Sciarrone
- Dipartimento di "Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali", University of Messina, Polo Annunziata-viale Annunziata, 98168, Messina, Italy
| | - Sebastiano Pantò
- Chromaleont s.r.l., c/o University of Messina, Polo Annunziata-viale Annunziata, 98168, Messina, Italy
| | - Paola Donato
- Dipartimento di "Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali", University of Messina, via Consolare Valeria, 98125, Messina, Italy
| | - Luigi Mondello
- Dipartimento di "Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali", University of Messina, Polo Annunziata-viale Annunziata, 98168, Messina, Italy; Chromaleont s.r.l., c/o University of Messina, Polo Annunziata-viale Annunziata, 98168, Messina, Italy; University Campus Bio-Medico of Rome, Via Álvaro del Portillo 21, 00128 Rome, Italy.
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Characterization of thermal desorption with the Deans-switch technique in gas chromatographic analysis of volatile organic compounds. J Chromatogr A 2016; 1462:107-14. [PMID: 27492597 DOI: 10.1016/j.chroma.2016.07.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 07/26/2016] [Accepted: 07/26/2016] [Indexed: 11/23/2022]
Abstract
This study presents a novel application based on the Deans-switch cutting technique to characterize the thermal-desorption (TD) properties for gas chromatographic (GC) analysis of ambient volatile organic compounds (VOCs). Flash-heating of the sorbent bed at high temperatures to desorb trapped VOCs to GC may easily produce severe asymmetric or tailing GC peaks affecting resolution and sensitivity if care is not taken to optimize the TD conditions. The TD peak without GC separation was first examined for the quality of the TD peak by analyzing a standard gas mixture from C2 to C12 at ppb level. The Deans switch was later applied in two different stages. First, it was used to cut the trailing tail of the TD peak, which, although significantly improved the GC peak symmetry, led to more loss of the higher boiling compounds than the low boiling ones, thus suggesting compound discrimination. Subsequently, the Deans switch was used to dissect the TD peak into six 30s slices in series, and an uneven distribution in composition between the slices were found. A progressive decrease in low boiling compounds and increase in higher boiling ones across the slices indicated severe inhomogeneity in the TD profile. This finding provided a clear evidence to answer the discrimination problem found with the tail cutting approach to improve peak symmetry. Through the use of the innovated slicing method based on the Deans-switch cutting technique, optimization of TD injection for highly resolved, symmetric and non-discriminated GC peaks can now be more quantitatively assessed and guided.
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Performance evaluation of a versatile multidimensional chromatographic preparative system based on three-dimensional gas chromatography and liquid chromatography-two-dimensional gas chromatography for the collection of volatile constituents. J Chromatogr A 2015; 1417:96-103. [PMID: 26410184 DOI: 10.1016/j.chroma.2015.09.039] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 09/10/2015] [Accepted: 09/11/2015] [Indexed: 11/23/2022]
Abstract
The present research deals with the multi-collection of the most important sesquiterpene alcohols belonging to sandalwood essential oil, as reported by the international regulations: (Z)-α-santalol, (Z)-α-trans bergamotol, (Z)-β-santalol, epi-(Z)-β-santalol, α-bisabolol, (Z)-lanceol, and (Z)-nuciferol. A versatile multidimensional preparative system, based on the hyphenation of liquid and gas chromatography techniques, was operated in the LC-GC-GC-prep or GC-GC-GC-prep configuration, depending on the concentration to be collected from the sample, without any hardware or software modification. The system was equipped with a silica LC column in combination with polyethylene glycol-poly(5% diphenyl/95% dimethylsiloxane)-medium polarity ionic liquid or β-cyclodextrin based GC stationary phases. The GC-GC-GC-prep configuration was exploited for the collection of four components, by using a conventional split/splitless injector, while the LC-GC-GC-prep approach was applied for three low abundant components (<5%), in order to increase the quantity collected within a single run, by the LC injection of a high sample amount. All target compounds, whose determination is hampered by the unavailability of commercial standards, were collected at milligram levels and with a high degree of purity (>87%).
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Review of the role and methodology of high resolution approaches in aroma analysis. Anal Chim Acta 2015; 854:1-12. [DOI: 10.1016/j.aca.2014.06.029] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 06/12/2014] [Accepted: 06/16/2014] [Indexed: 12/11/2022]
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10
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Chin ST, Marriott PJ. Multidimensional gas chromatography beyond simple volatiles separation. Chem Commun (Camb) 2014; 50:8819-33. [DOI: 10.1039/c4cc02018a] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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11
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Sciarrone D, Pantò S, Tranchida PQ, Dugo P, Mondello L. Rapid isolation of high solute amounts using an online four-dimensional preparative system: normal phase-liquid chromatography coupled to methyl siloxane-ionic liquid-wax phase gas chromatography. Anal Chem 2014; 86:4295-301. [PMID: 24725161 DOI: 10.1021/ac404078u] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study reports the recent evolution of a multidimensional GC-GC-GC preparative system, now combined with an online LC preseparation step, operated under normal phase conditions. It is herein shown that the four-dimensional instrument can collect sample components with a concentration lower than 10%, in a short time period, while maintaining a high level of analyte purity. The LC dimension allows (I) the injection of higher sample amounts, compared to "direct" GC injection; (II) a polarity-based preseparation, leading to the GC injection of simplified subsamples, and thus reducing the possibility of coelutions; (III) to eliminate the essential-oil "matrix", replacing it with the LC mobile phase (the GC system is more protected from potential contamination); (IV) the LC mobile phase is of much lower viscosity with respect to a pure, or highly concentrated essential oil, avoiding difficulties in the syringe sample withdrawal process, prior to GC injection. System optimization was performed by using standard solutions; in addition, a very complex sample, namely, vetiver essential oil, was subjected to the preparative process, with the scope of isolating two low-amount constituents (namely, α-amorphene and β-vetivone). The latter two sesquiterpenoids, which accounted for 1.7 and 4.0% of the sample (considering the volatiles), respectively, were successfully collected at the milligram level, in a one-day work period, with a purity degree in excess of 90%.
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Affiliation(s)
- Danilo Sciarrone
- Dipartimento di Scienze del Farmaco e dei Prodotti per la Salute, Università di Messina , Viale Annunziata, 98168 Messina, Italy
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Sciarrone D, Pantò S, Rotondo A, Tedone L, Tranchida PQ, Dugo P, Mondello L. Rapid collection and identification of a novel component from Clausena lansium Skeels leaves by means of three-dimensional preparative gas chromatography and nuclear magnetic resonance/infrared/mass spectrometric analysis. Anal Chim Acta 2013; 785:119-25. [DOI: 10.1016/j.aca.2013.04.069] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 04/15/2013] [Accepted: 04/30/2013] [Indexed: 11/24/2022]
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13
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Quantitative preparative gas chromatography of caffeine with nuclear magnetic resonance spectroscopy. J Sep Sci 2013; 36:1774-80. [DOI: 10.1002/jssc.201201081] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 02/11/2013] [Accepted: 03/05/2013] [Indexed: 11/07/2022]
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14
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Zuo HL, Yang FQ, Huang WH, Xia ZN. Preparative gas chromatography and its applications. J Chromatogr Sci 2013; 51:704-15. [PMID: 23592825 DOI: 10.1093/chromsci/bmt040] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Although hundreds of papers related to preparative gas chromatography (pGC) have been published since the late 1950s, the success of the GC technique has largely been associated with analytical instead of preparative purposes. Actually, pGC is an ideal alternative technique for the preparation of pure substances, especially volatile compounds. This paper reviews the papers (written in English) associated with pGC published over the period from the 1950s to the 2010s. For large scale preparation, large sample injection and vaporization, a high loading capacity column, a gas splitter at the end of the column and a special collecting device are fundamentally important for a pGC system. The primary components of pGC system, including injector, column, splitter, detector and collection traps, are briefly introduced. Furthermore, the applications of pGC in the separation and purification of volatile compounds from natural essential oils, in addition to the purification of isotopes, isomers and enantiomers are summarized.
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Affiliation(s)
- Hua-Li Zuo
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China
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15
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Sciarrone D, Pantò S, Ragonese C, Tranchida PQ, Dugo P, Mondello L. Increasing the Isolated Quantities and Purities of Volatile Compounds by Using a Triple Deans-Switch Multidimensional Preparative Gas Chromatographic System with an Apolar-Wax-Ionic Liquid Stationary-Phase Combination. Anal Chem 2012; 84:7092-8. [DOI: 10.1021/ac3013829] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Danilo Sciarrone
- Dipartimento Farmaco-chimico,
Facoltà di Farmacia, Università di Messina, viale Annunziata, 98168 Messina, Italy
- Chromaleont srl A spin-off of
the University of Messina, c/o University of Messina, Viale Annunziata, 98168 Messina, Italy
| | - Sebastiano Pantò
- Dipartimento Farmaco-chimico,
Facoltà di Farmacia, Università di Messina, viale Annunziata, 98168 Messina, Italy
| | - Carla Ragonese
- Dipartimento Farmaco-chimico,
Facoltà di Farmacia, Università di Messina, viale Annunziata, 98168 Messina, Italy
| | - Peter Quinto Tranchida
- Dipartimento Farmaco-chimico,
Facoltà di Farmacia, Università di Messina, viale Annunziata, 98168 Messina, Italy
| | - Paola Dugo
- Dipartimento Farmaco-chimico,
Facoltà di Farmacia, Università di Messina, viale Annunziata, 98168 Messina, Italy
- Centro Integrato di Ricerca (C.I.R.), Università Campus Bio-Medico, Via Álvaro
del Portillo, 21-00128 Roma, Italy
| | - Luigi Mondello
- Dipartimento Farmaco-chimico,
Facoltà di Farmacia, Università di Messina, viale Annunziata, 98168 Messina, Italy
- Centro Integrato di Ricerca (C.I.R.), Università Campus Bio-Medico, Via Álvaro
del Portillo, 21-00128 Roma, Italy
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Tang F, Ni Y, Zhang H, Li Y, Jin J, Wang L, Chen J. A new cleanup method of dioxins in sediment using large volume injection gas chromatography online coupled with liquid chromatography. Anal Chim Acta 2012; 729:73-9. [DOI: 10.1016/j.aca.2012.04.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2011] [Revised: 03/06/2012] [Accepted: 04/06/2012] [Indexed: 11/29/2022]
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18
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Šanda M, Žáček P, Streinz L, Dračínský M, Koutek B. Profiling and characterization of volatile secretions from the European stink bug Graphosoma lineatum (Heteroptera: Pentatomidae) by two-dimensional gas chromatography/time-of-flight mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 881-882:69-75. [DOI: 10.1016/j.jchromb.2011.11.043] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 11/23/2011] [Accepted: 11/27/2011] [Indexed: 10/14/2022]
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Park HE, Yang SO, Hyun SH, Park SJ, Choi HK, Marriott PJ. Simple preparative gas chromatographic method for isolation of menthol and menthone from peppermint oil, with quantitative GC-MS and (1) H NMR assay. J Sep Sci 2011; 35:416-23. [PMID: 22213698 DOI: 10.1002/jssc.201100670] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 10/19/2011] [Accepted: 11/01/2011] [Indexed: 11/06/2022]
Abstract
The quantitative performance of a simple home-built preparative gas chromatography (prep-GC) arrangement was tested, incorporating a micro-fluidic Deans switch, with collection of the target compound in a deactivated uncoated capillary tube. Repeat injections of a standard solution and peppermint sample were made into the prep-GC instrument. Individual compounds were eluted from the trapping capillary, and made up to constant volume. Chloronaphthalene internal standard was added in some cases. Recovered samples were quantitatively assayed by using GC-MS. Calibration linearity of GC-MS for menthol standard area response against number of injections (2-20 repeat injections) was excellent, giving R(2) of 0.996. For peppermint, menthol correlation over 2-20 repeated injections was 0.998 for menthol area ratio (versus IS) data. Menthone calibration for peppermint gave an R(2) of 0.972. (1) H NMR spectroscopy was conducted on both menthol and menthone. Good correspondence with reference spectra was obtained. About 80 μg of isolated menthol and menthone solute was collected over a sequence of 80 repeat injections from the peppermint sample, as assayed by 600 MHz (1) H NMR analysis (∼100% recovery for menthol from peppermint). A procedure is proposed for prediction of number of injections required to acquire sufficient material for NMR detection.
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Affiliation(s)
- Hae Eun Park
- College of Pharmacy, Chung-Ang University, Seoul, Republic of Korea
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Chin ST, Maikhunthod B, Marriott PJ. Universal Method for Online Enrichment of Target Compounds in Capillary Gas Chromatography Using In-Oven Cryotrapping. Anal Chem 2011; 83:6485-92. [DOI: 10.1021/ac200973z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sung-Tong Chin
- Centre for Green Chemistry, School of Chemistry, Monash University, Wellington Road, Clayton 3800, Australia, and College of Pharmacy (WCU), †Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Bussayarat Maikhunthod
- Centre for Green Chemistry, School of Chemistry, Monash University, Wellington Road, Clayton 3800, Australia, and College of Pharmacy (WCU), †Chung-Ang University, Seoul 156-756, Republic of Korea
| | - Philip J. Marriott
- Centre for Green Chemistry, School of Chemistry, Monash University, Wellington Road, Clayton 3800, Australia, and College of Pharmacy (WCU), †Chung-Ang University, Seoul 156-756, Republic of Korea
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Wu ZY, Rühle CP, Marriott PJ. Liquid chromatography fractionation with gas chromatography/mass spectrometry and preparative gas chromatography–nuclear magnetic resonance analysis of selected nonylphenol polyethoxylates. J Chromatogr A 2011; 1218:4002-8. [DOI: 10.1016/j.chroma.2011.04.079] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 02/06/2011] [Accepted: 04/26/2011] [Indexed: 11/17/2022]
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Nanogram-scale preparation and NMR analysis for mass-limited small volatile compounds. PLoS One 2011; 6:e18178. [PMID: 21464906 PMCID: PMC3065492 DOI: 10.1371/journal.pone.0018178] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2010] [Accepted: 02/22/2011] [Indexed: 11/19/2022] Open
Abstract
Semiochemicals are often produced in infinitesimally small quantities, so their isolation requires large amounts of starting material, not only requiring significant effort in sample preparation, but also resulting in a complex mixture of compounds from which the bioactive compound needs to be purified and identified. Often, compounds cannot be unambiguously identified by their mass spectra alone, and NMR analysis is required for absolute chemical identification, further exacerbating the situation because NMR is relatively insensitive and requires large amounts of pure analyte, generally more than several micrograms. We developed an integrated approach for purification and NMR analysis of <1 µg of material. Collections from high performance preparative gas-chromatography are directly eluted with minimal NMR solvent into capillary NMR tubes. With this technique, 1H-NMR spectra were obtained on 50 ng of geranyl acetate, which served as a model compound, and reasonable H-H COSY NMR spectra were obtained from 250 ng of geranyl acetate. This simple off-line integration of preparative GC and NMR will facilitate the purification and chemical identification of novel volatile compounds, such as insect pheromones and other semiochemicals, which occur in minute (sub-nanogram), and often limited, quantities.
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Yang FQ, Wang HK, Chen H, Chen JD, Xia ZN. Fractionation of volatile constituents from curcuma rhizome by preparative gas chromatography. JOURNAL OF AUTOMATED METHODS & MANAGEMENT IN CHEMISTRY 2011; 2011:942467. [PMID: 21876660 PMCID: PMC3159003 DOI: 10.1155/2011/942467] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2011] [Accepted: 06/21/2011] [Indexed: 05/14/2023]
Abstract
A preparative gas chromatography (pGC) method was developed for the separation of volatile components from the methanol extract of Curcuma rhizome. The compounds were separated on a stainless steel column packed with 10% OV-101 (3 m × 6 mm, i.d.), and then, the effluent was split into two gas flows. One percent of the effluent passed to the flame ionization detector (FID) for detection and the remaining 99% were directed to the fraction collector. Five volatile compounds were collected from the methanol extract of Curcuma rhizome (5 g/mL) after 83 single injections (20 uL) with the yield of 5.1-46.2 mg. Furthermore, the structures of the obtained compounds were identified as β-elemene, curzerene, curzerenone, curcumenol, and curcumenone by MS and NMR spectra, respectively.
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Affiliation(s)
- F. Q. Yang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China
| | - H. K. Wang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China
| | - H. Chen
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China
| | - J. D. Chen
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China
| | - Z. N. Xia
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China
- *Z. N. Xia:
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Kühnle M, Kreidler D, Holtin K, Czesla H, Schuler P, Schurig V, Albert K. Online coupling of enantioselective capillary gas chromatography with proton nuclear magnetic resonance spectroscopy. Chirality 2010; 22:808-12. [PMID: 20803744 DOI: 10.1002/chir.20840] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The hyphenation of enantioselective capillary gas chromatography and mass spectrometry is not always sufficient to distinguish between structural isomers, thus requiring peak identification by NMR spectroscopy. Here the first online coupling of enantioselective capillary gas chromatography with proton nuclear resonance spectroscopy is described for the unfunctionalized chiral alkane 2,4-dimethylhexane resolved on octakis(6-O-methyl-2,3-di-O-pentyl)-gamma-cyclodextrin at 60 degrees C. NMR allows constitutional and configurational isomers (diastereomers and enantiomers) to be distinguished. Enantiomers display identical spectra at different retention times, which enable an indirect identification of these unfunctionalized alkanes. The presented method is still at an early development stage, and will require instrumental optimization in the future.
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Affiliation(s)
- Maximilian Kühnle
- Institute of Organic Chemistry, University of Tübingen, Tübingen D-72076, Germany
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25
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Multiple component isolation in preparative multidimensional gas chromatography with characterisation by mass spectrometry and nuclear magnetic resonance spectroscopy. J Chromatogr A 2009; 1216:5740-7. [DOI: 10.1016/j.chroma.2009.06.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Revised: 05/27/2009] [Accepted: 06/02/2009] [Indexed: 11/21/2022]
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