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Regio- and Stereospecific Analysis of Triacylglycerols—A Brief Overview of the Challenges and the Achievements. Symmetry (Basel) 2022. [DOI: 10.3390/sym14020247] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The efforts to reveal, in detail, the molecular and intramolecular structures of one of the main lipid classes, namely, triacyl-sn-glycerols, which are now known to affect their specific and important role in all living organisms, are briefly overviewed. Some milestones of significance in the gradual but continuous development and improvement of the analytical methodology to identify the triacylglycerol regio- and stereoisomers in complex lipid samples are traced throughout the years: the use of chromatography based on different separation principles; the improvements in the chromatographic technique; the development and use of different detection techniques; the attempts to simplify and automatize the analysis without losing the accuracy of identification. The spectacular recent achievements of two- and multidimensional methods used as tools in lipidomics are presented.
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2
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Direct separation of the diastereomers of phosphatidylcholine hydroperoxide bearing 13-hydroperoxy-9Z,11E-octadecadienoic acid using chiral stationary phase high-performance liquid chromatography. J Chromatogr A 2015; 1386:53-61. [DOI: 10.1016/j.chroma.2015.01.080] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 01/26/2015] [Accepted: 01/27/2015] [Indexed: 11/23/2022]
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3
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Lísa M, Holčapek M. Characterization of triacylglycerol enantiomers using chiral HPLC/APCI-MS and synthesis of enantiomeric triacylglycerols. Anal Chem 2013; 85:1852-9. [PMID: 23298510 DOI: 10.1021/ac303237a] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work, the first systematic characterization of triacylglycerol (TG) enantiomers in real samples using chiral high-performance liquid chromatography (HPLC) with atmospheric pressure chemical ionization mass spectrometry (APCI-MS) is performed. Our chiral HPLC/APCI-MS method is based on the use of two cellulose-tris-(3,5-dimethylphenylcarbamate) columns connected in series using a gradient of hexane-2-propanol mobile phase. All TG enantiomers containing 1-8 DBs and different fatty acyl chain lengths are separated using our chiral HPLC method except for TGs having a combination of saturated and di- or triunsaturated fatty acyls in sn-1 and sn-3 positions. In our work, the randomization reaction of monoacyl TG standards is used for the preparation of all TG enantiomers and regioisomers in a mixture, while the stereospecific esterification of 1,2- or 2,3-isopropylidene-sn-glycerols by selected fatty acids is used for the synthesis of TG enantiomers. The composition of TG enantiomers and regioisomers in hazelnut oil and human plasma samples is determined. Unsaturated fatty acids are preferentially esterified in sn-2 position in hazelnut oil, while no significant preference of saturated or unsaturated fatty acyls is observed in case of human plasma sample. Fatty acids with the higher number of DBs are preferred in sn-1 position of TG enantiomers in hazelnut oil unlike to moderate sn-3 preference in human plasma. The characterization of cholesteryl esters from TG fraction of human plasma sample using our chiral HPLC/APCI-MS method is presented as well.
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Affiliation(s)
- Miroslav Lísa
- Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 53210 Pardubice, Czech Republic.
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Deng L, Nakano H, Iwasaki Y. Direct separation of monoacylglycerol isomers by enantioselective high-performance liquid chromatography. J Chromatogr A 2008; 1198-1199:67-72. [DOI: 10.1016/j.chroma.2008.03.095] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Revised: 02/25/2008] [Accepted: 03/13/2008] [Indexed: 11/30/2022]
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5
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Rodriguez JA, Mendoza LD, Pezzotti F, Vanthuyne N, Leclaire J, Verger R, Buono G, Carriere F, Fotiadu F. Novel chromatographic resolution of chiral diacylglycerols and analysis of the stereoselective hydrolysis of triacylglycerols by lipases. Anal Biochem 2007; 375:196-208. [PMID: 18162167 DOI: 10.1016/j.ab.2007.11.036] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Revised: 11/20/2007] [Accepted: 11/27/2007] [Indexed: 11/17/2022]
Abstract
In the present study, we propose a general and accessible method for the resolution of enantiomeric 1,2-sn- and 2,3-sn-diacylglycerols based on derivatization by isocyanates, which can be easily used routinely by biochemists to evaluate the stereopreferences of lipases in a time course of triacylglycerol (TAG) hydrolysis. Diacylglycerol (DAG) enantiomers were transformed into carbamates using achiral and commercially available reagents. Excellent separation and resolution factors were obtained for diacylglycerols present in lipolysis reaction mixtures. This analytical method was then applied to investigate the stereoselectivity of three model lipases (porcine pancreatic lipase, PPL; lipase from Rhizomucor miehei, MML; and recombinant dog gastric lipase, rDGL) in the time course of hydrolysis of prochiral triolein as a substrate. From the measurements of the diglyceride enantiomeric excess it was confirmed that PPL was not stereospecific (position sn-1 vs sn-3 of triolein), whereas MML and rDGL preferentially hydrolyzed the ester bond at position sn-1 and sn-3, respectively. The enantiomeric excess of DAGs was not constant with time, decreasing with the course of hydrolysis. This was due to the fact that DAGs can be products of the stereospecific hydrolysis of TAGs and substrates for stereospecific hydrolysis into monoacylglycerols.
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Affiliation(s)
- J A Rodriguez
- Laboratory of Enzymology at Interfaces and Physiology of Lipolysis, CNRS-UPR 9025-IBSM, 13009 Marseille, France
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Rosati O, Albrizio S, Montesano D, Riccieri R, Cossignani L, Curini M, Simonetti MS, Rastrelli L, Damiani P. HPLC separation and NMR structural elucidation of sn-1,2-, 2,3-, and 1,3-diacylglycerols from olive oil as naphthylethylurethane derivatives. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:191-6. [PMID: 17227041 DOI: 10.1021/jf062221f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
In this study, sn-1,2-, sn-2,3-, and sn-1,3-diacylglycerols were isolated from olive oil, and their urethane derivatives (urethanes) were prepared. Normal-phase high-performance liquid chromatography (NP-HPLC) separation of the urethane isomers was performed and the separate classes were studied by nuclear magnetic resonance (NMR). The use of 1H NMR and homo- and heteronuclear 2D techniques provided a great amount of information in a very short time, particularly when a high-field NMR instrument (700 MHz) was used. Particularly diagnostic for this kind of compound was the glyceridic moiety that presents typical chemical shifts both for carbon and hydrogen. These studies show the usefulness of NMR spectroscopy to recognize clearly the sn-1,3- and, moreover, sn-1,2- with respect to sn-2,3-diacylglycerols, although very minor differences occur between them.
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Affiliation(s)
- O Rosati
- Chimica e Tecnologia del Farmaco, Università degli Studi di Perugia, via del Liceo 1, 06123 Perugia, Italy
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7
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Kuksis A, Itabashi Y. Regio- and stereospecific analysis of glycerolipids. Methods 2005; 36:172-85. [PMID: 15896980 DOI: 10.1016/j.ymeth.2004.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2004] [Revised: 11/15/2004] [Accepted: 11/15/2004] [Indexed: 10/25/2022] Open
Abstract
In recent years researchers have recognized the potential value of comprehensive lipid profiling (lipidomics), which was invented and promoted by lipidologists who recognized the many valuable applications that grew out of the fields of DNA profiling (genomics) and protein profiling (proteonomics). Through lipid class-selective intrasource ionization and subsequent analysis of two-dimensional cross-peak intensities, the chemical identity and mass composition of individual molecular species of most lipid classes can now be determined in a chloroform extract. There remains, however, the necessity to distinguish the enantiomers and isobaric regioisomers resulting from enzymatic and chemical reactions, which conventional high performance liquid chromatography/mass spectrometry (HPLC/MS) has been slow to accommodate, and tandem MS unable to provide. While reversed-phase HPLC can separate regioisomers, normal-phase HPLC can resolve diastereomers, and chiral-phase HPLC can effect dramatic resolution of enantiomers, the full potential of the combined systems has seldom been exploited. The present chapter calls attention to both recent and earlier combinations of these methodologies with mass spectrometry, which allows the HPLC/ESI (electrospray ionization)-MS/MS separation and identification of enantiomeric diacylglycerols, triacylglycerols, and glycerophospholipids as well as their isobaric regioisomers. These developments permit further expansion of lipid profiling (lipidomics) and better understanding of lipid metabolism.
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Affiliation(s)
- Arnis Kuksis
- Banting and Best Department of Medical Research, University of Toronto, Toronto, Canada M5G 1L6.
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9
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ITABASHI Y, FUJISHIMA H, SATO R. Chiral Phase High-Performance Liquid Chromatographic Separation of Enantiomeric 1,2- and 2,3-O-Isopropylidene-sn-glycerols as 3,5-Dinitrophenylurethanes. J Oleo Sci 2004. [DOI: 10.5650/jos.53.405] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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10
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Highly sensitive method for the separation of enantiomeric and regioisomeric diacylglycerols as 2-anthrylurethanes by chiral-phase high-performance liquid chromatography with fluorescence detection. J Chromatogr A 1998. [DOI: 10.1016/s0021-9673(98)00870-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Laakso P. Analysis of triacylglycerols— approaching the molecular composition of natural mixtures. FOOD REVIEWS INTERNATIONAL 1996. [DOI: 10.1080/87559129609541075] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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12
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Myher JJ, Kuksis A. General strategies in chromatographic analysis of lipids. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL APPLICATIONS 1995; 671:3-33. [PMID: 8520698 DOI: 10.1016/0378-4347(95)00178-l] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Lipid extracts of natural sources contain a large number of lipid classes and molecular species. Completely reproducible samples are obtained only with great care and skill. Analytical methods other than chromatography and/or mass spectrometry are of little use for resolution and identification of lipid molecules even in simple mixtures. The analytical information desired governs the selection of the chromatographic and mass spectrometric method, which determine the sample preparation and derivative needed. Usually a combination of chromatographic methods is necessary to identify specific species of lipids. The recent development of soft ionization techniques, that are readily interfaced with mass spectrometers, have greatly simplified the sample preparation and have largely eliminated the need for derivatization. Because these techniques require expensive equipment and dedicated operators, the methods selected must be consistent with the true analytical needs and the available resources. Although personal preference cannot be eliminated entirely, the general strategies outlined below should help to reduce the number of possibilities facing a lipid analyst to a few practical choices.
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Affiliation(s)
- J J Myher
- Banting and Best Department of Medical Research, University of Toronto, Canada
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13
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Kim JH, Nishida Y, Ohrui H, Meguro H. Simple and highly sensitive high-performance liquid chromatographic method for separating enantiomeric diacylglycerols by direct derivatization with a fluorescent chiral agent, (S)-(+)-2-tert.-butyl-2-methyl-1,3-benzodioxole-4-carboxylic acid. J Chromatogr A 1995. [DOI: 10.1016/0021-9673(94)00977-h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Kim JH, Uzawa H, Nishida Y, Ohrui H, Meguro H. Highly sensitive high-performance liquid chromatographic method for the determination of the absolute configuration and the optical purity of di-O-acyl. J Chromatogr A 1994. [DOI: 10.1016/0021-9673(94)80542-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Itabashi Y, Myher JJ, Kuksis A. Determination of positional distribution of short-chain fatty acids in bovine milk fat on chiral columns. J AM OIL CHEM SOC 1993. [DOI: 10.1007/bf02564223] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yutaka Itabashi
- ; BBDMR; University of Toronto; 112 College St. Toronto M5G 1L6 Canada
- ; Department of Chemistry, Faculty of Fisheries; Hokkaido University; Hakodate, Hokkaido Japan
| | - John J. Myher
- ; BBDMR; University of Toronto; 112 College St. Toronto M5G 1L6 Canada
| | - Arnis Kuksis
- ; BBDMR; University of Toronto; 112 College St. Toronto M5G 1L6 Canada
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16
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A convenient evaluation of the stereoselectivity of lipase-catalyzed hydrolysis of tri-O-acylglycerols on a chiral-phase liquid chromatography. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/0005-2760(93)90201-j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Hirotaka U, Takanori N, Yoshihiro N, Hiroshi O, Hiroshi M. Determination of the lipase stereoselectivities using circular dichroism (CD); lipases produce chiral di-O-acylglycerols from achiral tri-O-acylglycerols. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/0005-2760(93)90180-h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Takagi T, Suzuki T. Enantiomeric resolution of diacylglycerol derivatives by high-performance liquid chromatography on a chiral stationary phase at low temperatures. Lipids 1993. [DOI: 10.1007/bf02536648] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Takagi T, Suzuki T. Effect of temperature on chiral and achiral separations of diacylglycerol derivatives by high-performance liquid chromatography on a chiral stationary phase. J Chromatogr A 1992. [DOI: 10.1016/0021-9673(92)85198-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Chapter 15 Lipids. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/s0301-4770(08)61508-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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21
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Semporé G, Bézard J. Determination of molecular species of oil triacylglycerols by reversed-phase and chiral-phase high-performance liquid chromatography. J AM OIL CHEM SOC 1991. [DOI: 10.1007/bf02662156] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G. Semporé
- ; Unite de Nutrition Cellulaire et Métabolique; Université de Bourgogne; BP 138 21004 Dijon Cedex France
| | - J. Bézard
- ; Unite de Nutrition Cellulaire et Métabolique; Université de Bourgogne; BP 138 21004 Dijon Cedex France
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22
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Enantiomer separation by chiral-phase liquid chromatography of urethane derivatives of natural diacylglycerols previously fractionated by reversed-phase liquid chromatography. J Chromatogr A 1991. [DOI: 10.1016/s0021-9673(01)87135-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Semporé B, Bézard J. Analysis and fractionation of natural source diacylglycerols as urethane derivatives by reversed-phase high-performance liquid chromatography. J Chromatogr A 1991. [DOI: 10.1016/s0021-9673(01)88632-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Determination of molecular species of enantiomeric diacylglycerols by chiral phase high performance liquid chromatography and polar capillary gas-liquid chromatography. J Lipid Res 1990. [DOI: 10.1016/s0022-2275(20)42277-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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25
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Enantiomer separation of diacid-diacylglycerol mixtures by high-performance liquid chromatography on a chiral column. J Chromatogr A 1990. [DOI: 10.1016/0021-9673(90)85152-l] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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HPLC resolution of diacylglycerol moieties of natural triacylglycerols on a chiral phase consisting of bonded (R)-(+)-1-(1-naphthyl)ethylamine. J Lipid Res 1990. [DOI: 10.1016/s0022-2275(20)42355-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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27
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Enantiomer separations of mixtures of monoacylglycerol derivatives by HPLC on a chiral column. Lipids 1990. [DOI: 10.1007/bf02537983] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Laakso P, Christie WW. Chromatographic resolution of chiral diacylglycerol derivatives: potential in the stereospecific analysis of triacyl-sn-glycerols. Lipids 1990; 25:349-53. [PMID: 2366632 DOI: 10.1007/bf02544346] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Diacylglycerols have been separated as their (S)-(+)-or (R)-(-)-1-(1-naphthyl)ethyl urethanes by high performance liquid chromatography (HPLC) on a column of silica gel with 0.5% 2-propanol in hexane as the mobile phase. The elution order of components derivatized with the (S)-form of the reagent was 1,3-, followed by 1,2-, and finally 2,3-diacyl-sn-glycerols. The elution order of 1,2- and 2,3-diasteromers was reversed when the (R)-form of 1-(1-naphthyl)ethyl isocyanate was used for derivatization. Single-acid 1,2- and 2,3-diastereomers were separated to the baseline with a resolution factor from 5.2-5.7, and the resolution factor between 1,3- and 1,2- or 2,3-diacyl-sn-glycerol derivatives was more than 23. Molecular species of single-acid diacylglycerol derivatives were separated in the sequence 18:1 less than 18:0 less than 18:2 less than 16.0. In order to assess this methodology as part of a procedure for the stereospecific analysis of triacyl-sn-glycerols, we prepared diacyl-rac-glycerols from maize oil, evening primrose oil and egg yolk triacylglycerols by partial hydrolysis with ethyl magnesium bromide. The 1,3-, 1,2- and 2,3-diacyl-sn-glycerols as (S)-(+)-1-(1-naphthyl)ethyl urethanes were isolated and their fatty acid compositions were determined. Although this only permitted an indirect determination of the compositions of positions sn-1, -2 and -3, it was sufficient to indicate the potential of the methodology because results comparable to those published earlier were achieved.
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Affiliation(s)
- P Laakso
- Hannan Research Institute, Ayr. Scotland
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29
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Uzawa H, Nishida Y, Ohrui H, Meguro H. A new approach to determine the stereospecificity in lipase catalysed hydrolysis using circular dichroism (CD): lipases produce optically active diglycerides from achiral triglycerides. Biochem Biophys Res Commun 1990; 168:506-11. [PMID: 2334421 DOI: 10.1016/0006-291x(90)92350-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We describe a sensitive CD method for determining the stereospecificity in lipase (E.C.3.1.1.3) catalysed hydrolysis of triacyl glycerols into diacyl glycerols. The diglycerols were converted to chiral tert-butyldimethylsilylated 1,2- or 2,3-di-O-benzoyl-sn-glycerol (5 or 5'), and their CD was measured. This approach showed for the first time that lipases produce optically active diacyl glycerides from achiral tripalmitin and tribenzoyl glyceride with a variable extent of enantioselectivity depending on the acyl groups and the enzymes.
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Affiliation(s)
- H Uzawa
- Department of Food Chemistry, Faculty of Agriculture, Tohoku University, Sendai, Japan
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30
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Takagi T, Okamoto J, Ando Y, Itabashi Y. Separation of the enantiomers of 1-alkyl-2-acyl-rac-glycerol and of 1-alkyl-3-acyl-rac-glycerol by high performance liquid chromatography on a chiral column. Lipids 1990. [DOI: 10.1007/bf02562213] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Francotte E, Wolf RM. Preparation of chiral building blocks and auxiliaries by chromatography on cellulose triacetate (CTA I): Indications for the presence of multiple interaction sites in CTA I. Chirality 1990. [DOI: 10.1002/chir.530020104] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Liquid chromatographic determination of the species composition of membrane lipids and their derivatives. Chem Nat Compd 1989. [DOI: 10.1007/bf00597645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Hoskins JA, Evans CE. Measurement of intracellular diacylglycerols by acetylation and thin-layer chromatography. JOURNAL OF CHROMATOGRAPHY 1989; 490:439-43. [PMID: 2768416 DOI: 10.1016/s0378-4347(00)82803-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- J A Hoskins
- MRC Toxicology Unit, Carshalton, Surrey, U.K
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34
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Itabashi Y, Takagi T, Tsuda T. High-performance liquid chromatographic separation of alkane-1,2-diol enantiomers on a chiral slurry-packed capillary column. J Chromatogr A 1989. [DOI: 10.1016/s0021-9673(00)94115-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Takagi T, Itabashi Y. Rapid separations of diacyl- and dialkylglycerol enantiomers by high performance liquid chromatography on a chiral stationary phase. Lipids 1987; 22:596-600. [PMID: 3657398 DOI: 10.1007/bf02537287] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Rapid and practical separations of 1,2- and 2,3-diacyl- and dialkyl-sn-glycerol enantiomers as their 3,5-dinitrophenyl-urethane derivatives were carried out by normal-phase high performance liquid chromatography on a chiral stationary phase, N-(R)-1-(alpha-naphthyl)ethylaminocarbonyl-(S)-valine chemically bonded to gamma-aminopropyl silanized silica. Complete separations of the racemates into enantiomers were achieved for both of the diacyl- and dialkylglycerols within 10 min using a stainless steel column (25 cm long) packed with the 5-mu particles, an isocratic elution with a mixture of hexane/ethylene dichloride/ethanol as a mobile phase and a UV detector. The sn-1,2-enantiomers were eluted ahead of the corresponding sn-2,3-enantiomers. Satisfactory separation of the sn-1,3-diacylglycerols from the corresponding enantiomers and the separation of the homologues differing in acyl and alkyl groups were also observed. The formations of hydrogen bonding and charge transfer complex between the urethane derivatives and the stationary phase may contribute to the enantiomer separations.
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Affiliation(s)
- T Takagi
- Department of Chemistry, Faculty of Fisheries, Hokkaido University, Hakodate, Japan
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