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Comparison of high-performance liquid chromatography and supercritical fluid chromatography using evaporative light scattering detection for the determination of plasticizers in medical devices. J Chromatogr A 2015; 1417:104-15. [DOI: 10.1016/j.chroma.2015.09.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 08/03/2015] [Accepted: 09/09/2015] [Indexed: 01/05/2023]
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Liou YB, Sheu MT, Liu DZ, Lin SY, Ho HO. Quantitation of ceramides in nude mouse skin by normal-phase liquid chromatography and atmospheric pressure chemical ionization mass spectrometry. Anal Biochem 2010; 401:107-13. [DOI: 10.1016/j.ab.2010.02.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Revised: 02/08/2010] [Accepted: 02/09/2010] [Indexed: 10/19/2022]
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Gaudin K, Chaminade P, Ferrier D, Baillet A. IMPROVEMENT OF EVAPORATIVE LIGHT SCATTERING DETECTION OF CERAMIDES USING TRIETHYLAMINE AND FORMIC ACID IN NON-AQUEOUS REVERSED PHASE LIQUID CHROMATOGRAPHY. J LIQ CHROMATOGR R T 2007. [DOI: 10.1081/jlc-100101458] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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West C, Cilpa G, Gaudin K, Chaminade P, Lesellier E. Modelling of ceramide interactions with porous graphite carbon in non-aqueous liquid chromatography. J Chromatogr A 2005; 1087:77-85. [PMID: 16130700 DOI: 10.1016/j.chroma.2005.03.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Interactions of solutes on porous graphitic carbon (PGC) with non-aqueous mobile phases are studied by the linear solvation energy relationship (LSER). Studies have been carried out with eight binary mixtures composed of a weak solvent (acetonitrile or methanol) and a strong solvent (tetrahydrofuran, n-butanol, CH2Cl2, 1,1,2-trichloro-2,2,1-trifluoroethane). The systematic analysis of a set of test compounds was performed for each solvent mixture in isocratic mode (50:50). The results were compared to those obtained on PGC with hydro-organic liquids and supercritical fluids. They were then correlated with the observed retention behaviour of lipid compounds, more particularly ceramides.
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Affiliation(s)
- C West
- LETIAM, University de Paris-Sud (XI), IUT d'Orsay, Plateau du Moulon, F-91400 Orsay, France
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Roy S, Gaudin K, Germain DP, Baillet A, Prognon P, Chaminade P. Optimisation of the separation of four major neutral glycosphingolipids: application to a rapid and simple detection of urinary globotriaosylceramide in Fabry disease. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 805:331-7. [PMID: 15135109 DOI: 10.1016/j.jchromb.2004.03.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2003] [Revised: 03/15/2004] [Accepted: 03/15/2004] [Indexed: 11/28/2022]
Abstract
A simple method for the separation of the four major neutral glycosphingolipids, present in all human tissue, was developed. This gradient normal phase-HPLC method utilises a polyvinyl alcohol bonded stationary phase and an evaporative light-scattering detection (ELSD). Screening pure solvents in a binary gradient elution mode allowed, in a first step, to assess the behaviour of the studied solutes and to select the solvents for further mobile phase optimisation. The proportion of the remaining solvents was defined to reach a maximal resolution. The reduction of the analysis time and the enhancement of the signal were obtained by optimising the gradient slope and the flow-rate. Optimal levels of triethylamine and formic acid (TEA-FA) for the enhancement of the evaporative light scattering detector response were established at 0.1% (v/v). Thus, the optimal conditions for the separation of the four glycosphingolipids was obtained with a gradient elution from a 100% chloroform to a 100% acetone:methanol (90:10 (v/v)) mobile phase at 0.2 ml min-1, using a 10% min-1 gradient slope. Finally, this method was applied to detect the excess of one of the neutral sphingolipids, namely globotriaosylceramide (Gb3) in the urine of patients affected with Fabry disease. A liquid-liquid extraction of the sediments obtained from an aliquot of only ten ml of urine proved sufficient to detect the excess of Gb3 present in both hemizygote and heterozygote patients. In all, the ability of our method to detect abnormal amounts of Gb3 in urinary sediments could allow the diagnosis of weakly symptomatic Fabry patients in large screening programs
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Affiliation(s)
- S Roy
- Groupe de Chimie Analytique du Sud de Paris, EA 3343, Laboratoire de Chimie Analytique, Faculté de Pharmacie, 92296 Châtenay-Malabry, Cedex, France
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6
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Deschamps FS, Gaudin K, Baillet A, Chaminade P. Wheat digalactosyldiacylglycerol molecular species profiling using porous graphitic carbon stationary phase. J Sep Sci 2004; 27:1313-22. [PMID: 15587281 DOI: 10.1002/jssc.200401874] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The potential of porous graphitic carbon stationary phase (PGC) was assessed for the separation of molecular species of digalactosyldiacylglycerol (DGDG). Detection was by an evaporative light scattering detector (ELSD). A conventional optimization strategy allowed definition of a quaternary non-aqueous mobile phase and separation of 9 wheat DGDG molecular species with isocratic elution: methanol/toluene/tetrahydrofuran/chloroform 64.3/21.5/13.7/0.5 v/v with 0.1% of triethylamine and a stoichiometric amount of formic acid. The molecular species were identified by LC/MS. The chromatographic behavior of DGDG on PGC was then compared to previous studies. The addition of a carbon double bond on the alkyl chain decreased the retention. This contribution was less important when the number of unsaturations increased in the alkyl chain. The consequence of this retention behavior with PGC was an elution order of molecular species which did not agree with the partition number as observed with C18 grafted stationary phases.
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Affiliation(s)
- Frantz S Deschamps
- Groupe de Chimie Analytique de Paris-Sud, EA 3343, Laboratoire de Chimie Analytique, Faculté de pharmacie, 5 rue Jean-Baptiste Clement, 92296 Châtenay-Malabry cedex, France
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Gaudin K, Baillet A, Chaminade P. Adaptation of an evaporative light-scattering detector to micro and capillary liquid chromatography and response assessment. J Chromatogr A 2004; 1051:43-51. [PMID: 15532554 DOI: 10.1016/j.chroma.2004.05.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A commercially available evaporative light-scattering detection (ELSD) system was adapted for micro and capillary LC. Therefore the various parameters involved in the droplet formation during the nebulization step in the ELSD system were studied. It was shown that the velocity term in the Nukiyama Tanasawa equation remains constant, leading to droplets of the same order of magnitude for narrow bore and capillary columns. Consequently, the ELSD modification was performed by decreasing the internal diameter of the effluent capillary tube in the nebulizer nozzle and by keeping its external diameter constant. Next, response curves for a conventional and the developed micro and capillary LC were compared as to investigate why a linear ELSD response is often obtained when used in micro or capillary LC. By splitting the flow rate post column, we showed that the nebulization process was not at the origin of the phenomenon. For ceramide III and tripalmitin, the response curves were found to be non-linear. However the curvature was less significant when the columns internal diameter decreased. Calculated particle size profiles for micro or capillary LC suggest that the particle entering the detection chamber are bigger than under conventional LC conditions. Last, triethylamine and formic acid were used to increase the response of the detector. The response enhancement, expected from previous studies, was established for the two lipids involved in this study.
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Affiliation(s)
- Karen Gaudin
- Groupe de Chimie Analytique de Paris-Sud: EA 3343, Laboratoire de Chimie Analytique, Faculté de Pharmacie, Châtenay-Malabry, France
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Raith K, Farwanah H, Wartewig S, Neubert RHH. Progress in the analysis of Stratum corneum ceramides. EUR J LIPID SCI TECH 2004. [DOI: 10.1002/ejlt.200400982] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Lesellier E, Gaudin K, Chaminade P, Tchapla A, Baillet A. Isolation of ceramide fractions from skin sample by subcritical chromatography with packed silica and evaporative light scattering detection. J Chromatogr A 2003; 1016:111-21. [PMID: 14601832 DOI: 10.1016/s0021-9673(03)01323-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Separative method of lipid classes from the stratum corneum was developed with packed silica and supercritical CO2 containing 10% of methanol at 15 degrees C, 15 MPa and 3 ml min(-1). The elution order of lipid classes was first esterified cholesterol, triglycerides, squalene co-eluted in a single peak, then free fatty acids, free cholesterol, ceramides and finally glycosylceramides. The ceramides were eluted in several fractions which depended on the number of hydroxyl groups in the molecule, i.e. more hydroxyl groups were contained in ceramides, more important was the retention. Moreover, the retention was not altered by the presence of carbon double bond and variation of the alkyl chain length. The ceramide response with the evaporative light scattering detector was improved by turning the influence of the solvent nature on the response to advantage. Therefore, addition of various solvents with or without triethylamine and formic acid were tested in post-column due to the incompatibility of such modifiers with silica stationary phase. Thereby the solvent conditions for the separation and the detection can be adjusted almost independently. The response was greatly increased by post-column addition of 1% (v/v) triethylamine and its equivalent amount of formic acid in dichloromethane introduced at 0.1 ml min(-1) into the mobile phase. This device had allowed the detection of 400 ng of ceramide with a S/N = 21, whereas no peak was observed in absence of the post-column addition. Finally, the method was applied to the treatment of skin sample which led to highly enriched ceramide fraction.
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Zhang M, Xie J, Zhou Q, Chen G, Li Z. On-line solid-phase extraction of ceramides from yeast with ceramide III imprinted monolith. J Chromatogr A 2003; 984:173-83. [PMID: 12564688 DOI: 10.1016/s0021-9673(02)01847-2] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A molecularly imprinted polymeric monolith (MIPM) was prepared by in situ polymerization using styrene, glycidyl methacrylate and methacrylic acid as monomers, divinylbenzene and triallyl isocyanurate as cross-linking agents, and ceramide III as print molecule. The texture, pore size distribution, mobile phase flow characteristic, and chromatographic performance of the MIPM and a control monolith synthesized without the print molecule were examined, respectively. The results showed that using ceramide III as print molecule significantly affected the pore structure and pore distribution of the monolith, and greatly improved the retention of ceramide III and its analogues used in cosmetics as well. The retention of ceramide III on the MIPM could be reduced by increasing the ratio of chloroform to hexane in eluting buffer. The workability of the MIPM was firstly demonstrated through the separation of a model lipid mixture containing ceramide III and ergosterol, the main sterol impurity in yeast lipid extracts. The application of the ceramide III imprinted monolith to the isolation of ceramides from yeast lipid extracts was attempted and resulted in a considerable enrichment of ceramides, as shown by FIIR analysis. This indicates the potential of ceramide III imprinted monolith synthesized in the present study in the on-line solid-phase extraction of ceramides from yeast.
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Affiliation(s)
- Minlian Zhang
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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Lee MH, Lee GH, Yoo JS. Analysis of ceramides in cosmetics by reversed-phase liquid chromatography/electrospray ionization mass spectrometry with collision-induced dissociation. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2003; 17:64-75. [PMID: 12478556 DOI: 10.1002/rcm.878] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A rapid, sensitive and selective method involving reversed-phase liquid chromatography (LC) with electrospray ionization (ESI) mass spectrometry (MS) was employed for determination of commercial ceramides in cosmetics for quality control of the product formulation. Using this LC/ESI-MS technique, simultaneous separation and characterization of ceramides and an impurity substance were possible. Informative fragmentation patterns were obtained by employing LC/ESI-MS in both positive and negative ionization modes to identify the structures of both sphingoid base and N-acyl chains of ceramides, and also of an impurity. The combination of positive and negative mass spectra can be used for unambiguous confirmation of ceramides and for characterization of unknown species. In-source collision-induced fragmentation resulted in characteristic product anions for the ceramides containing a phytosphingosine moiety at m/z 267, 255 and 225, and for those with a sphingosine moiety at m/z 263 and 237, regardless of the length of the fatty acyl chains. The detection limit was about 0.5 pmol in selected-ion monitoring mode. Quantification using internal standards showed good linearity and a relative standard deviation of 4%. These ceramides were more sensitively detected in positive than in negative ion mode.
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Affiliation(s)
- Myoung Hee Lee
- Department of Chemistry, Chungnam National University, Daejon 305-764, Korea
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Zhou Q, Zhang L, Fu XQ, Chen GQ. Quantitation of yeast ceramides using high-performance liquid chromatography-evaporative light-scattering detection. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 780:161-9. [PMID: 12383492 DOI: 10.1016/s1570-0232(02)00466-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A high-performance liquid chromatograph equipped with an evaporative light scattering detector (ELSD) (HPLC-ELSD) was used to assay the ceramides in yeast cells. The HPLC-ELSD method employed a cyanopropyl bonded column (CN column) that effectively separated the main interfering substance ergosterol without any derivatization process; most other interfering substances were also removed. The method can be applied for routine assay of ceramide content in yeast.
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Affiliation(s)
- Quan Zhou
- Department of Biological Science and Biotechnology, Tsinghua University, Beijing 100084, China
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Gaudin K, Chaminade P, Baillet A. Eluotropic strength in non-aqueous liquid chromatography with porous graphitic carbon. J Chromatogr A 2002; 973:61-8. [PMID: 12437164 DOI: 10.1016/s0021-9673(02)01123-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Porous graphitic carbon is an attractive packing for the chromatographic analysis of highly hydrocarbonaceous compounds with non-aqueous mobile phase. An eluotropic-strength scale of 10 pure organic solvents was established using the methylene selectivity from the fatty acid methyl ester homologous series (chain length between 18 and 31 carbon atoms). Eight binary mobile phases combining a weak solvent: methanol or acetonitrile with a strong solvent: toluene, chloroform, dichloromethane or tetrahydrofuran at different volume fractions phi of strong solvents (ranging from 0.3 to 1.0) were tested and their eluotropic strengths were then compared with those of pure solvents. The curves of the eluotropic strength versus the volume fraction of the strong solvent followed two different trends: linear or curved. The knowledge of the pure solvent strength is not sufficient to predict the eluotropic strength of solvent in the mixture. Then modelling of the eluotropic strength for binary mobile phases was envisaged in order to provide a prediction tool. This model was assessed for the establishment of the composition of eight iso-eluotropic mobile phases. Good assessment was found except in the case of toluene with acetonitrile where the difference between the predicted and the real value was the highest.
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Affiliation(s)
- Karen Gaudin
- Groupe de Chimie Analytique de Paris-Sud, Laboratoire de Chimie Analytique, Faculté de Pharmacie, Châtenay-Malabry, France.
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Gaudin K, Chaminade P, Baillet A. Structure-retention diagrams of ceramides established for their identification. J Chromatogr A 2002; 973:69-83. [PMID: 12437165 DOI: 10.1016/s0021-9673(02)01120-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Molecular species analysis of ceramides was carried out using porous graphitic carbon with gradient elution: chloroform-methanol from 45:55 to 85:15 with a slope at 2.7%/min. These conditions gave a linear relationship between retention data and structure of ceramides. It was demonstrated that linearity occurred when a high slope value of linear gradient elution was used. Thereby the linear diagram was evolved by plotting the adjusted retention time against the total number of carbon atoms of ceramide molecules. Each line represents one ceramide class. Such a Structure-Retention Diagram describes ceramide retention and thus constitutes an identification method using only retention data. This Structure-Retention Diagram was assessed and compared to another obtained from octadesyl-grafted silica in terms of their reproducibility, precision and ability to provide ceramide identification. Better identification was obtained using the results from both Structure-Retention Diagrams. This approach with a two-dimensional separation system allowed to take advantage of the specificity of both identification models.
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Affiliation(s)
- Karen Gaudin
- Groupe de Chimie Analytique de Paris-Sud, Laboratoire de Chimie Analytique, Faculté de Pharmacie, Châtenay-Malabry, France.
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Gaudin K, Chaminade P, Baillet A. Chromatographic methods for ceramide identification. Lipids 2001; 36:1387-8. [PMID: 11834093 DOI: 10.1007/s11745-001-0857-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Response enhancement for the evaporative light scattering detection for the analysis of lipid classes and molecular species. Chromatographia 2001. [DOI: 10.1007/bf02492186] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Vietzke JP, Brandt O, Abeck D, Rapp C, Strassner M, Schreiner V, Hintze U. Comparative investigation of human stratum corneum ceramides. Lipids 2001; 36:299-304. [PMID: 11337986 DOI: 10.1007/s11745-001-0721-9] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stratum corneum (SC) requires ceramides, cholesterol, and fatty acids to provide the cutaneous permeability barrier. SC lipids can be analyzed by normal-phase high-performance thin-layer chromatography (HPTLC). However, without further analysis, some uncertainty remains about the molecular composition of lipids represented by every TLC band of an unknown sample. We therefore analyzed each ceramide band further by subjecting the isolated lipids to a direct coupling of reversed-phase high-performance liquid chromatography and electrospray ionization-mass spectrometry (HPLC/ESI-MS, or LC/MS). LC/MS analysis and ESI-MS/MS negative ion and collision-induced dissociation experiments revealed that ceramide band 4 contained not only N-(omega-OH-acyl)acyl-6-OH-sphingosine, Cer(EOH), but also N-(alpha-OH-acyl)-sphingosine. Band 5 exclusively contained N-acyl-6-OH-sphingosine. Our results demonstrate the benefit of LC/MS analysis for selective identification of human SC ceramides. Moreover, the combination of HPTLC for pre-separation and LC/MS for identification of lipids is an even more powerful tool for detailed ceramide analysis.
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Molander P, Holm A, Lundanes E, Greibrokk T, Ommundsen E. Separation of Ceramides by Sub-Ambient Temperature-Assisted Large Volume Injection in Temperature-Programmed Packed Capillary Liquid Chromatography. ACTA ACUST UNITED AC 2000. [DOI: 10.1002/1521-4168(20001101)23:11<653::aid-jhrc653>3.0.co;2-a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Gaudin K, Lesellier E, Chaminade P, Ferrier D, Baillet A, Tchapla A. Retention behaviour of ceramides in sub-critical fluid chromatography in comparison with non-aqueous reversed-phase liquid chromatography. J Chromatogr A 2000; 883:211-22. [PMID: 10910215 DOI: 10.1016/s0021-9673(00)00445-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study was devoted to the development of an analytical method for ceramide analysis in packed subcritical fluid chromatography (pSubFC). Monofunctional grafted silica support was found to be more suitable for ceramide analysis. Five Kromasil columns were coupled and the parameters, temperature, pressure and percentage of organic modifier in CO2 were optimised, considering selectivity and analysis time. The final conditions were 31 degrees C, 6% of methanol (MeOH) and 13 MPa. In these conditions the selectivity for structural differences (methylene group, unsaturation or two different bases) were studied. As classically observed, the methylene selectivity decreased with the increase of the eluotropic strength. Moreover, unlike in non-aqueous reversed-phase liquid chromatography (NARP-LC), adding a further unsaturation and two further methylene groups on ceramide results to an increase of retention in pSubFC. Moreover, this last technique allowed to separate ceramides with the same total number of carbons containing unsaturated fatty acids, when the distribution of carbon number of the two chain is very different. These results had enabled to plot retention chart in order to predict ceramide structure in view to identify additional ceramide. This retention chart was finally compared with the one already obtained in NARP-LC.
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Affiliation(s)
- K Gaudin
- Laboratoire de chimie analytique, Faculté de pharmacie, Châtenay-Malabry, France
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Zhou JY, Chaminade P, Gaudin K, Prognon P, Baillet A, Ferrier D. Postcolumn fluorescence as an alternative to evaporative light scattering detection for ceramide analysis with gradient elution in non-aqueous reversed-phase liquid chromatography. J Chromatogr A 1999; 859:99-105. [PMID: 10563420 DOI: 10.1016/s0021-9673(99)00822-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Ceramide analysis was developed with gradient elution in non-aqueous reversed-phase liquid chromatography with evaporative light scattering detection (ELSD) or postcolumn fluorescence detection. Fluorescence detection (excitation, 360 nm; emission, 425 nm) after postcolumn formation of mixed assemblies between eluted ceramides and 1,6-diphenyl-1,3,5-hexatriene was developed. In comparison with ELSD, fluorescence detection allows a better detection of the minor species ceramide from ceramide type III (commercial mixture of non-hydroxy fatty acid-sphingosine) and appears to be more sensitive for quantitation of ceramides at low concentrations. The fluorescence response is linear over a wide range of injected amount of ceramide III (expressed as stearoyl-phytosphingosine): 10 ng to 1000 ng. The response of ELSD is non linear but can be linearized in double logarithmic coordinates for calculations over a narrow range, e.g. between 10 to 350 ng ceramide III injected. The lower quantitation limits of these two detectors are similar: 5 ng ceramide III was injected.
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Affiliation(s)
- J Y Zhou
- Laboratoire de Chimie Analytique, Faculté de Pharmacie, Chatenay-Malabry, France
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Gaudin K, Chaminade P, Ferrier D, Baillet A. Use of principal component analysis for investigation of factors affecting retention behaviour of ceramides on porous graphitized carbon column. Chromatographia 1999. [DOI: 10.1007/bf02490744] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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