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Zhou Y, Ramirez A, Yuill EM, Wang Q. Mechanistic studies to understand peak tailing due to sulfinic acid- and carboxylic acid-silanophilic interactions in reversed-phase liquid chromatography. J Chromatogr A 2024; 1721:464819. [PMID: 38537485 DOI: 10.1016/j.chroma.2024.464819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 03/13/2024] [Accepted: 03/14/2024] [Indexed: 04/13/2024]
Abstract
Silanophilic interactions are a primary contributor to peak tailing of acidic pharmaceutical compounds, thus a thorough understanding is especially important for reversed-phase liquid chromatography (RPLC) method development. Herein, a sulfinic acid compound that exhibited severe peak tailing in RPLC with acidic mobile phases was carefully studied. Results indicated that the neutral protonated form of the sulfinic acid is involved in the strong interaction that leads to peak tailing, but that tailing can be mitigated with a blocking effect achieved through use of acetic acid modifier in the mobile phase. Peak tailing was also observed with other structurally-similar sulfinic acids and carboxylic acids but was, in general, less severe with the latter. The Hydrophobic Subtraction Model (HSM) was applied to six commercial C18 columns that exhibited different tailing behaviors for the sulfinic acid compound in attempts to identify key sites of interaction within the stationary phase. A combination of heated acid column wash experiments and density functional theory (DFT) calculations indicate that the differential interactions of the acids with vicinal silanol pairs in the stationary phase play a major role in peak tailing.
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Affiliation(s)
- Yiyang Zhou
- Chemical Process Development, Bristol Myers Squibb Company, 1 Squibb Drive, New Brunswick, NJ 08903, USA.
| | - Antonio Ramirez
- Chemical Process Development, Bristol Myers Squibb Company, 1 Squibb Drive, New Brunswick, NJ 08903, USA
| | - Elizabeth M Yuill
- Chemical Process Development, Bristol Myers Squibb Company, 1 Squibb Drive, New Brunswick, NJ 08903, USA
| | - Qinggang Wang
- Chemical Process Development, Bristol Myers Squibb Company, 1 Squibb Drive, New Brunswick, NJ 08903, USA
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2
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Metal-Chelating Peptides Separation Using Immobilized Metal Ion Affinity Chromatography: Experimental Methodology and Simulation. SEPARATIONS 2022. [DOI: 10.3390/separations9110370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Metal-Chelating Peptides (MCPs), obtained from protein hydrolysates, present various applications in the field of nutrition, pharmacy, cosmetic etc. The separation of MCPs from hydrolysates mixture is challenging, yet, techniques based on peptide-metal ion interactions such as Immobilized Metal Ion Affinity Chromatography (IMAC) seem to be efficient. However, separation processes are time consuming and expensive, therefore separation prediction using chromatography modelling and simulation should be necessary. Meanwhile, the obtention of sorption isotherm for chromatography modelling is a crucial step. Thus, Surface Plasmon Resonance (SPR), a biosensor method efficient to screen MCPs in hydrolysates and with similarities to IMAC might be a good option to acquire sorption isotherm. This review highlights IMAC experimental methodology to separate MCPs and how, IMAC chromatography can be modelled using transport dispersive model and input data obtained from SPR for peptides separation simulation.
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Reshetova EN. Adsorption of mandelic acid enantiomers on chiral stationary phase with grafted antibiotic eremomycin: The effect of the eluent pH. J LIQ CHROMATOGR R T 2020. [DOI: 10.1080/10826076.2020.1842212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Elena N. Reshetova
- Institute of Technical Chemistry of the Ural Branch, Russian Academy of Science, Perm, Russia
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Van Wanseele Y, Viaene J, Van den Borre L, Dewachter K, Vander Heyden Y, Smolders I, Van Eeckhaut A. LC-method development for the quantification of neuromedin-like peptides. Emphasis on column choice and mobile phase composition. J Pharm Biomed Anal 2017; 137:104-112. [DOI: 10.1016/j.jpba.2017.01.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 01/05/2017] [Accepted: 01/06/2017] [Indexed: 01/17/2023]
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Zhang Y, Zhang Y, Wang G, Chen W, He P, Wang Q. Simultaneous separation of polar and non-polar mixtures by capillary HPLC based on an ostadecylsilane and taurine derivatized silica continuously packed column. Talanta 2016; 161:762-768. [DOI: 10.1016/j.talanta.2016.09.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 09/02/2016] [Accepted: 09/08/2016] [Indexed: 02/06/2023]
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Combining Chemometric Models with Adsorption Isotherm Measurements to Study Omeprazole in RP-LC. Chromatographia 2016; 79:1283-1291. [PMID: 27738352 PMCID: PMC5039227 DOI: 10.1007/s10337-016-3151-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Revised: 06/21/2016] [Accepted: 06/26/2016] [Indexed: 11/25/2022]
Abstract
The adsorption of the proton-pump inhibitor omeprazole was investigated using RP-LC with chemometric models combined with adsorption isotherm modelling to study the effect of pH and type of organic modifier (i.e., acetonitrile or methanol). The chemometric approach revealed that omeprazole was tailing with methanol and fronting with acetonitrile along with increased fronting at higher pH. The increased fronting with higher pH for acetonitrile was explored using a pH-dependent adsorption isotherm model that was determined using the inverse method and it agreed well with the experimental data. The model indicated that the peaks exhibit more fronting at high pH due to a larger fraction of charged omeprazole molecules. This model could accurately predict the shape of elution profiles at arbitrary pH levels in the studied interval. Using a two-layer adsorption isotherm model, the difference between acetonitrile and methanol was studied at the lowest pH at which almost all omeprazole molecules are neutral. Omeprazole had adsorbate–adsorbate interactions that were similar in strength for the acetonitrile and methanol mobile phases, while the solute–adsorbent interactions were almost twice as strong with methanol. The difference in the relative strengths of these two interactions likely explains the different peak asymmetries (i.e., tailing/fronting) in methanol and acetonitrile. In conclusion, thermodynamic modelling can complement chemometric modeling in HPLC method development and increase the understanding of the separation.
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Gritti F. Determination of the solvent density profiles across mesopores of silica-C18 bonded phases in contact with acetonitrile/water mixtures: A semi-empirical approach. J Chromatogr A 2015; 1410:90-8. [DOI: 10.1016/j.chroma.2015.07.073] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 07/13/2015] [Accepted: 07/18/2015] [Indexed: 11/29/2022]
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Forssén P, Fornstedt T. A model free method for estimation of complicated adsorption isotherms in liquid chromatography. J Chromatogr A 2015. [DOI: 10.1016/j.chroma.2015.07.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Gritti F, Guiochon G. Hydrophilic interaction chromatography: A promising alternative to reversed-phase liquid chromatography systems for the purification of small protonated bases. J Sep Sci 2015; 38:1633-41. [DOI: 10.1002/jssc.201401351] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Revised: 02/14/2015] [Accepted: 02/15/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Fabrice Gritti
- Department of Chemistry; University of Tennessee; Knoxville TN USA
| | - Georges Guiochon
- Department of Chemistry; University of Tennessee; Knoxville TN USA
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Effects of the surface concentration of fixed charges in C18-bonded stationary phases on the adsorption process and on the preparative chromatography of small ionizable compounds. J Chromatogr A 2014; 1372C:42-54. [DOI: 10.1016/j.chroma.2014.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 09/30/2014] [Accepted: 10/02/2014] [Indexed: 11/19/2022]
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Gritti F, Guiochon G. Separation of peptides and intact proteins by electrostatic repulsion reversed phase liquid chromatography. J Chromatogr A 2014; 1374:112-121. [PMID: 25488252 DOI: 10.1016/j.chroma.2014.11.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 11/13/2014] [Accepted: 11/14/2014] [Indexed: 11/30/2022]
Abstract
A new brand of BEH-C18 hybrid particles chemically bonded to a leash carrying an amine group permits the implementation of electrostatic repulsive interactions chromatography. Using columns packed with this material, the influence of the concentration of positive charges bonded to the BEH-C18 surface on the overloaded band profiles of a few positively charged peptides and proteins was investigated in the gradient elution mode. Three columns packed with endcapped BEH-C18 particles bonded with three different surface-charge densities (LOW, MEDIUM and HIGH) were used and compared with those provided by a column packed with non-doped, endcapped BEH-C18 particles. The surface concentrations of fixed charges in the LOW, MEDIUM and HIGH columns were estimated at 0.029, 0.050, and 0.064μmol/m(2), for example, about two orders of magnitude smaller than the surface density of bonded C18 chains (2.1μmol/m(2)). Three different mobile phase additives (0.1% v/v of trifluoro-acetic, phosphoric, and formic acid) were used to optimize the purification levels of proteins under different loading conditions. The weak ion-pairing ions (formate and phosphate) generate smaller retention but broader, more fronting band profiles than those eluted with a stronger ion-pairing ion (trifluoroactate). This effect is worse in the presence of fixed charges at the surface of the BEH-C18 particles. This was explained by an enhanced anti-Langmuirian adsorption behavior of the charged proteins in the presence of fixed surface charges. As the protein concentration increases in the bulk, so does the internal ionic strength, the electrostatic repulsive interactions weaken, and retention increases. Band fronting is mostly eliminated by replacing weak ion-pairing acids with TFA with which the adsorption isotherm remains weakly langmuirian. Faster but still complete gradient separation of insulin and myoglobin were achieved with the HIGH column than with the reference neutral column, despite a measurable loss in selectivity.
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Affiliation(s)
- Fabrice Gritti
- Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600, USA.
| | - Georges Guiochon
- Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600, USA.
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Ruiz-Angel M, Pous-Torres S, Carda-Broch S, García-Alvarez-Coque M. Performance of different C18 columns in reversed-phase liquid chromatography with hydro-organic and micellar-organic mobile phases. J Chromatogr A 2014; 1344:76-82. [DOI: 10.1016/j.chroma.2014.04.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 04/02/2014] [Accepted: 04/04/2014] [Indexed: 11/30/2022]
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14
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Samuelsson J, Forssén P, Fornstedt T. Sample conditions to avoid pH distortion in RP-LC. J Sep Sci 2013; 36:3769-75. [DOI: 10.1002/jssc.201300217] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Revised: 08/29/2013] [Accepted: 09/20/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Jörgen Samuelsson
- Department of Engineering and Chemical Sciences; Karlstad University; Karlstad Sweden
| | - Patrik Forssén
- Department of Engineering and Chemical Sciences; Karlstad University; Karlstad Sweden
| | - Torgny Fornstedt
- Department of Engineering and Chemical Sciences; Karlstad University; Karlstad Sweden
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Florez C, Kazakevich Y. INFLUENCE OF IONIC MOBILE PHASE ADDITIVES WITH LOW CHARGE DELOCALIZATION ON THE RETENTION OF IONIC ANALYTES IN REVERSED-PHASE HPLC. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2012.670183] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Cesar Florez
- a Department of Chemistry and Biochemistry , Seton Hall University , South Orange , New Jersey , USA
| | - Yuri Kazakevich
- a Department of Chemistry and Biochemistry , Seton Hall University , South Orange , New Jersey , USA
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Gritti F, Guiochon G. Effect of the pH and the ionic strength on overloaded band profiles of weak bases onto neutral and charged surface hybrid stationary phases in reversed-phase liquid chromatography. J Chromatogr A 2013; 1282:113-26. [DOI: 10.1016/j.chroma.2013.01.063] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 01/10/2013] [Accepted: 01/11/2013] [Indexed: 11/24/2022]
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Gritti F, Guiochon G. Adsorption behaviors of neutral and ionizable compounds on hybrid stationary phases in the absence (BEH-C18) and the presence (CSH-C18) of immobile surface charges. J Chromatogr A 2013; 1282:58-71. [DOI: 10.1016/j.chroma.2013.01.024] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 11/19/2012] [Accepted: 01/06/2013] [Indexed: 10/27/2022]
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18
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Gritti F, Guiochon G. Effect of the ionic strength on the adsorption process of an ionic surfactant onto a C18-bonded charged surface hybrid stationary phase at low pH. J Chromatogr A 2013; 1282:46-57. [DOI: 10.1016/j.chroma.2013.01.027] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Revised: 12/18/2012] [Accepted: 01/06/2013] [Indexed: 12/01/2022]
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Overloading study of basic compounds with a positively charged C18 column in liquid chromatography. J Chromatogr A 2013; 1281:60-6. [PMID: 23411141 DOI: 10.1016/j.chroma.2013.01.074] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2012] [Revised: 12/30/2012] [Accepted: 01/17/2013] [Indexed: 11/23/2022]
Abstract
While tailing and overloading of basic compounds remain problematic on most RP columns, a new kind of positively charged RP column named XCharge C18 was found to be superior good for the separation of alkaloids in our practical use. In this work, the surface charge property of the XCharge C18 column was evaluated by the retention of NO(3)(-) under different pH values and buffer concentrations. A considerable and pH-dependent positive charge was confirmed on the column. Then overloading behaviors of bases were systematically studied using amitriptyline as a basic probe. Good peak shapes (Tf<1.5) and extra high loadability with a C(0.5) of about 30,000 mg/L were observed on the column, with commonly used 0.1% formic acid as mobile phase additive. However, increasing the ionic strength of buffer with phosphates led to tailing peaks at high sample amount and sharp decline in loadability (C(0.5) of 2000-3000 mg/L), although it brought higher column efficiency at low sample amount. Higher pH also induced worse performance and lower loadability. The overall results demonstrated the importance of an appropriate level of ionic repulsion for the XCharge C18 column to achieve the good performance for bases, which could be explained by the multiple-site adsorption theory as ionic repulsion would shield the solute from occupying high-energy sites deeper in C18 layer.
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Comparison of the performance of Chromolith Performance RP-18e, 1.8-μm Zorbax Eclipse XDB-C18 and XTerra MS C18, based on modelling approaches. Anal Bioanal Chem 2012; 405:2219-31. [DOI: 10.1007/s00216-012-6448-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 09/06/2012] [Accepted: 09/21/2012] [Indexed: 10/27/2022]
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Fernández-Navarro J, Torres-Lapasió J, Ruiz-Ángel M, García-Álvarez-Coque M. Silanol suppressing potency of alkyl-imidazolium ionic liquids on C18 stationary phases. J Chromatogr A 2012; 1232:166-75. [DOI: 10.1016/j.chroma.2011.11.054] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 11/22/2011] [Accepted: 11/23/2011] [Indexed: 11/28/2022]
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Heinisch S, DAttoma A, Grivel C. Effect of pH additive and column temperature on kinetic performance of two different sub-2?m stationary phases for ultrafast separation of charged analytes. J Chromatogr A 2012; 1228:135-47. [DOI: 10.1016/j.chroma.2011.08.041] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Revised: 08/08/2011] [Accepted: 08/11/2011] [Indexed: 11/27/2022]
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Marchetti N, Pasti L, Dondi F, Cavazzini A. Recent Developments and Applications in Nonlinear Reversed Phase Liquid Chromatography. ADVANCES IN CHROMATOGRAPHY 2012; 50:415-40. [PMID: 26437517 DOI: 10.1201/b11636-10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Schubert B, Oberacher H. Impact of solvent conditions on separation and detection of basic drugs by micro liquid chromatography–mass spectrometry under overloading conditions. J Chromatogr A 2011; 1218:3413-22. [DOI: 10.1016/j.chroma.2011.03.051] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Revised: 03/11/2011] [Accepted: 03/18/2011] [Indexed: 10/18/2022]
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Edström L, Samuelsson J, Fornstedt T. Deformations of overloaded bands under pH-stable conditions in reversed phase chromatography. J Chromatogr A 2011; 1218:1966-73. [DOI: 10.1016/j.chroma.2010.09.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Revised: 08/25/2010] [Accepted: 09/01/2010] [Indexed: 11/29/2022]
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Buszewski B, Bocian S, Rychlicki G. Investigation of silanol activity on the modified silica surfaces using microcalorimetric measurements. J Sep Sci 2011; 34:773-9. [DOI: 10.1002/jssc.201000736] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Revised: 12/22/2010] [Accepted: 01/22/2011] [Indexed: 11/11/2022]
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The adsorption of Naproxen enantiomers on the chiral stationary phase Whelk-O1 under reversed-phase conditions: The effect of buffer composition. J Chromatogr A 2010; 1217:7055-64. [DOI: 10.1016/j.chroma.2010.08.073] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2010] [Revised: 07/29/2010] [Accepted: 08/26/2010] [Indexed: 11/24/2022]
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The role of ion-pairing in peak deformations in overloaded reversed-phase chromatography of peptides. J Chromatogr A 2010; 1217:7065-73. [PMID: 20875642 DOI: 10.1016/j.chroma.2010.09.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2010] [Revised: 07/07/2010] [Accepted: 09/03/2010] [Indexed: 11/20/2022]
Abstract
The paper reports a study on the role of ion-pairing behind peak deformations, e.g. peak splitting and even peak disappearance, during the elution of a peptide at highly overloaded conditions in reversed-phase chromatography. Deformation of component peaks is not uncommon in chromatography. There are reports which discuss their occurrence, but mostly at analytical scale, while their occurrence is quite common also in the preparative scale, as in the case discussed in this work. This paper first describes the conditions leading to peak splitting and peak disappearance of an industrial peptide, then explains the plausible reasons behind such behaviour, and finally with experimental analysis demonstrates the role of ion-pairing in causing such behaviour.
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Asnin LD, Guiochon G. Retention of Naproxen enantiomers on the chiral stationary phase Whelk-O1 under reversed-phase conditions. A reconsideration of the adsorption mechanism in the light of new experimental data. J Chromatogr A 2010; 1217:1709-11. [DOI: 10.1016/j.chroma.2010.01.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Revised: 12/26/2009] [Accepted: 01/06/2010] [Indexed: 11/26/2022]
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New approach to optimize HPLC separations of acid–base compounds with elution order involved, by using combined three-band resolution maps. Anal Bioanal Chem 2010; 396:2647-56. [DOI: 10.1007/s00216-010-3493-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Revised: 12/22/2009] [Accepted: 01/18/2010] [Indexed: 10/19/2022]
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31
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Asnin L, Gritti F, Kaczmarski K, Guiochon G. Features of the adsorption of Naproxen on the chiral stationary phase (S,S)-Whelk-O1 under reversed-phase conditions. J Chromatogr A 2010; 1217:264-75. [DOI: 10.1016/j.chroma.2009.11.039] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2009] [Revised: 11/09/2009] [Accepted: 11/13/2009] [Indexed: 11/30/2022]
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Abstract
Exploring stem cells is a fascinating task, especially in a discipline where the use of stem cells seems far-fetched at first glance, as is the case in psychiatry. In this article we would like to provide a brief overview of the current situation in relation to the treatment of mental diseases. For reasons that we will explain, this review will focus on affective disorders. The following section will give a more detailed account of stem-cell biology including current basic science approaches presenting in-vivo and in-vitro techniques. The final part will then look into future perspectives of using these stem cells to cure mental illnesses, and discuss the related challenges and opportunities.
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Affiliation(s)
- Jens Benninghoff
- Department of Psychiatry, Ludwig-Maximilian University, Munich, Germany.
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McCalley DV. The challenges of the analysis of basic compounds by high performance liquid chromatography: some possible approaches for improved separations. J Chromatogr A 2009; 1217:858-80. [PMID: 20031138 DOI: 10.1016/j.chroma.2009.11.068] [Citation(s) in RCA: 182] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2009] [Revised: 10/13/2009] [Accepted: 11/23/2009] [Indexed: 11/18/2022]
Abstract
This review considers some of the difficulties encountered with the analysis of ionised bases using reversed-phase chromatography, such as detrimental interaction with column silanol groups, and overloading which both lead to poor peak shapes. Methods of overcoming these problems in reversed-phase (RP) separations, by judicious selection of the column and mobile phase conditions, are discussed. Hydrophilic interaction chromatography is considered as an alternative method for the separation of some basic compounds.
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Affiliation(s)
- David V McCalley
- Centre for Research in Biomedicine, University of the West of England, Frenchay, Bristol BS16 1QY, UK.
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34
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Gritti F, Guiochon G. Characteristics of the adsorption mechanism of acido-basic compounds with two p in reversed-phase liquid chromatography. J Chromatogr A 2009; 1216:6917-30. [DOI: 10.1016/j.chroma.2009.07.064] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Revised: 07/27/2009] [Accepted: 07/28/2009] [Indexed: 10/20/2022]
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35
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Pous-Torres S, Ruiz-Ángel MJ, Torres-Lapasió JR, García-Álvarez-Coque MC. Performance of a Chromolith RP-18e column for the screening of β-blockers. J Sep Sci 2009; 32:2841-53. [DOI: 10.1002/jssc.200900291] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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36
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Band profiles of reacting acido-basic compounds with water–methanol eluents at different and ionic strengths in reversed-phase liquid chromatography. J Chromatogr A 2009; 1216:3175-84. [DOI: 10.1016/j.chroma.2009.02.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2008] [Revised: 01/26/2009] [Accepted: 02/03/2009] [Indexed: 11/16/2022]
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