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D'Atri V, Imiołek M, Quinn C, Finny A, Lauber M, Fekete S, Guillarme D. Size exclusion chromatography of biopharmaceutical products: From current practices for proteins to emerging trends for viral vectors, nucleic acids and lipid nanoparticles. J Chromatogr A 2024; 1722:464862. [PMID: 38581978 DOI: 10.1016/j.chroma.2024.464862] [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: 03/01/2024] [Revised: 03/29/2024] [Accepted: 03/31/2024] [Indexed: 04/08/2024]
Abstract
The 21st century has been particularly productive for the biopharmaceutical industry, with the introduction of several classes of innovative therapeutics, such as monoclonal antibodies and related compounds, gene therapy products, and RNA-based modalities. All these new molecules are susceptible to aggregation and fragmentation, which necessitates a size variant analysis for their comprehensive characterization. Size exclusion chromatography (SEC) is one of the reference techniques that can be applied. The analytical techniques for mAbs are now well established and some of them are now emerging for the newer modalities. In this context, the objective of this review article is: i) to provide a short historical background on SEC, ii) to suggest some clear guidelines on the selection of packing material and mobile phase for successful method development in modern SEC; and iii) to highlight recent advances in SEC, such as the use of narrow-bore and micro-bore columns, ultra-wide pore columns, and low-adsorption column hardware. Some important innovations, such as recycling SEC, the coupling of SEC with mass spectrometry, and the use of alternative detectors such as charge detection mass spectrometry and mass photometry are also described. In addition, this review discusses the use of SEC in multidimensional setups and shows some of the most recent advances at the preparative scale. In the third part of the article, the possibility of SEC for the characterization of new modalities is also reviewed. The final objective of this review is to provide a clear summary of opportunities and limitations of SEC for the analysis of different biopharmaceutical products.
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Affiliation(s)
- Valentina D'Atri
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU - Rue Michel Servet 1,4, 1211 Geneva, Switzerland; School of Pharmaceutical Sciences, University of Geneva, CMU - Rue Michel Servet 1,4, 1211 Geneva, Switzerland
| | | | | | - Abraham Finny
- Waters Corporation, Wyatt Technology, Santa Barbara, CA, USA
| | - Matthew Lauber
- Waters Corporation, Wyatt Technology, Santa Barbara, CA, USA
| | | | - Davy Guillarme
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU - Rue Michel Servet 1,4, 1211 Geneva, Switzerland; School of Pharmaceutical Sciences, University of Geneva, CMU - Rue Michel Servet 1,4, 1211 Geneva, Switzerland.
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2
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Zöldhegyi A, Horváth K, Kormány R. Revisiting column selectivity choices in ultra-high performance liquid chromatography-Using multidimensional analytical Design Spaces to identify column equivalency. J Chromatogr A 2024; 1719:464738. [PMID: 38422706 DOI: 10.1016/j.chroma.2024.464738] [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: 02/09/2024] [Accepted: 02/13/2024] [Indexed: 03/02/2024]
Abstract
Current guides and column selection system (CSS) platforms can provide some helpful insights with regard to the selection of alternative phases. Their practical reliability however, can also turn out to be questionable, especially considering the lack of detailed specifics, such as a clear definition of points of equivalence-appropriate running conditions under which the given analytical mixture can be satisfactorily resolved on various stationary phases. In this context, the use of multivariate modeling tools can be highly beneficial. These tools, when applied systematically, are ideal for uniquely characterizing complex LC-separation systems, a fact supported by numerous peer-reviewed papers. Revisiting our earlier work [1] and the applied systematic workflow [2], we used a Design Space modeling software (DryLab), with the main focus on building and comparing 3-dimensional separation models of amlodipine and its related impurities to identify shared method conditions under which columns are conveniently interchangeable. Our study comprised 5, C18-modified ultra-high performance liquid chromatography (UHPLC) columns in total, in some cases with surprising results. We identified several equivalences between the Design Spaces (DSs) of markedly different columns. Conversely, there were cases where, despite the predicted similarities in column data, the modeled DSs demonstrated clear differences between the selected stationary phases.
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Affiliation(s)
- Arnold Zöldhegyi
- Department of Analytical Chemistry, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary; Molnár-Institute for Applied Chromatography, Schneeglöckchenstrasse 47, 10407 Berlin, Germany
| | - Krisztián Horváth
- Department of Analytical Chemistry, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary
| | - Róbert Kormány
- Egis Pharmaceuticals Plc., Keresztúri út 30-38, Budapest, Hungary.
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3
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Fekete S, Lauber M, Xu M. Considering the selectivity of pore size gradient size exclusion chromatography columns. J Chromatogr A 2024; 1718:464726. [PMID: 38354505 DOI: 10.1016/j.chroma.2024.464726] [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: 12/12/2023] [Revised: 01/25/2024] [Accepted: 02/07/2024] [Indexed: 02/16/2024]
Abstract
One of the most significant performance determining variables of a size exclusion column is the pore size of its packing material. This is most definitely the case for assigning the suitability of a given column for differently sized analytes. As technologies for particle and column manufacturing continue to advance, it is worth contemplating the value of more finely controlled manipulation of this parameter. The change in a packing material's pores across the length of a size exclusion column was thus explored. A change in average pore diameter and pore size distribution was studied by means of theoretical modeling. These parameters were investigated for independent and combinatorial effects. From our predictions, versus tandem column chromatography, a gradient column apparatus does not yield sizable increases in monomer to dimer selectivity of any given critical pair. Instead, our modeling suggests it can yield more universally effective separations of multiple pairs of species at once, as is sometimes necessary when analyzing the high molecular weight components of highly aggregated drug substances.
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Affiliation(s)
- Szabolcs Fekete
- Waters Corporation, located in CMU-Rue Michel Servet 1, 1211 Geneva 4, Switzerland.
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4
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Jaekel A, Legelli M, Wirtz M, Meyer D, Schräder N, Streckel K, Lamotte S. Selectivity optimization in liquid chromatography via stationary phase tuning. J Sep Sci 2023; 46:e2300204. [PMID: 37568243 DOI: 10.1002/jssc.202300204] [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: 03/28/2023] [Revised: 07/28/2023] [Accepted: 08/03/2023] [Indexed: 08/13/2023]
Abstract
In striving for the best possible separation, the selectivity of stationary phases as an optimization parameter is often underestimated although there are many ways to influence this powerful tool. This review serves to provide an insight into the various ways of adapting the selectivity of a separation in liquid chromatography. Approaches via temperature and flow rate tuning are discussed as a basis followed by focusing on the stationary phase as the superior optimization parameter. Highly selective stationary phases hereby provide an advantage for groups of similar analytes. For more complex mixtures, separations can be improved using mixed-mode technologies where different retention mechanisms are combined. Serial coupling, mixed-bed columns, and stationary phase optimized selectivity liquid chromatography provide solutions to various degrees. Finally, the advantages of stationary phase tuning over adaption of mobile phase and/or temperature are presented in terms of optimum application range.
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Affiliation(s)
- Alexander Jaekel
- Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, Rheinbach, Germany
| | - Mo Legelli
- Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, Rheinbach, Germany
| | - Michaela Wirtz
- Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, Rheinbach, Germany
| | - Daniel Meyer
- Department of Analytical and Material Science, BASF SE, Ludwigshafen, Germany
| | - Nicole Schräder
- Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, Rheinbach, Germany
| | - Kevin Streckel
- Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, Rheinbach, Germany
| | - Stefan Lamotte
- Department of Analytical and Material Science, BASF SE, Ludwigshafen, Germany
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5
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Gong X, Chen W, Zhang K, Li T, Song Q. Serially coupled column liquid chromatography: An alternative separation tool. J Chromatogr A 2023; 1706:464278. [PMID: 37572536 DOI: 10.1016/j.chroma.2023.464278] [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: 05/30/2023] [Revised: 07/20/2023] [Accepted: 08/02/2023] [Indexed: 08/14/2023]
Abstract
Despite the rapid development of liquid chromatography (LC) in recent decades, it remains a challenge to achieve the desired chromatographic separation of complex matrices using a single column. Multi-column LC techniques, particularly serially coupled column LC (SCC-LC), have emerged as a promising solution to overcome this challenge. While more attention has been focused on heart-cutting or comprehensive two-dimensional LC, reviews specifically focusing on SCC-LC, which offers advantages in terms of precision and facile instrumentation, are scarce. Here, our concerns are devoted to the progress summary regarding the instrumentation and applications of SCC-LC. Emphasis is placed on column selection aiming to enlarge peak capacity, selectivity, or both through the optimization of combination types (e.g. RPLC-RPLC, -RPLC-HILIC, and achiral-chiral LC), connection devices (e.g. zero dead volume connector, tubing, and T-type connector), elution program (i.e. isocratic or gradient) and detectors (e.g. mass spectrometer, ultraviolet detector, and fluorescence detector). The application of SCC-LC in pharmaceutical, biological, environmental, and food fields is also reviewed, and future perspectives and potential directions for SCC-LC are discussed. We envision that the review can give meaningful information to analytical scientists when facing heavy chromatographic separation tasks for complicated matrices.
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Affiliation(s)
- Xingcheng Gong
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Wei Chen
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Ke Zhang
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Ting Li
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Qingqing Song
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China.
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6
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Fekete S, Lauber M. Studying the possibilities of dual stationary phase gradients to explore alternative selectivities in liquid chromatography. J Chromatogr A 2022; 1681:463492. [PMID: 36116368 DOI: 10.1016/j.chroma.2022.463492] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/05/2022] [Accepted: 09/07/2022] [Indexed: 11/25/2022]
Abstract
Previous studies on stationary phase gradients have inspired a new phase of theoretical work and an expansion of the concept to include multiple retention mechanisms. The theoretical work presented here corroborates previous reports that a stationary phase gradient can produce selectivity in a separation as effectively as careful adjustments to a mobile phase gradient program, especially when such column is operated in mobile phase gradient elution mode. In reality, no column is singularly based on one type of interaction mechanism, and many columns are nowadays designed to solicit multiple solute to stationary phase interactions. These mixed-mode columns inspired us to give more careful consideration to the idea of dual stationary phase gradients. With the theory applied here, it is suggested that the modulation of two unique interaction mechanisms across a chromatographic column has the potential to open up previously unseen selectivities. With the increasing prevalence of mixed-mode columns, we believe there will be ample opportunity to explore these new concepts in experimental work.
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Affiliation(s)
- Szabolcs Fekete
- Waters Corporation, located in CMU-Rue Michel Servet 1, 1211 Geneva 4, Switzerland.
| | - Matthew Lauber
- Waters Corporation, 34 Maple Street, Milford, MA 01757, United States
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7
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Stationary-phase optimized selectivity in supercritical fluid chromatography using a customized Phase OPtimized Liquid Chromatography kit: comparison of different prediction approaches. Anal Bioanal Chem 2020; 412:6553-6565. [DOI: 10.1007/s00216-020-02739-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 05/19/2020] [Accepted: 05/25/2020] [Indexed: 10/24/2022]
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8
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Cain CN, Forzano AV, Rutan SC, Collinson MM. Destructive stationary phase gradients for reversed-phase/hydrophilic interaction liquid chromatography. J Chromatogr A 2018; 1570:82-90. [DOI: 10.1016/j.chroma.2018.07.073] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 07/24/2018] [Accepted: 07/26/2018] [Indexed: 02/05/2023]
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9
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Jeong LN, Rutan SC. Simulation of elution profiles in liquid chromatography – III. Stationary phase gradients. J Chromatogr A 2018; 1564:128-136. [DOI: 10.1016/j.chroma.2018.06.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 06/03/2018] [Accepted: 06/04/2018] [Indexed: 02/07/2023]
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10
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Deconinck E, Djiogo CS, Kamugisha A, Courselle P. The use of Stationary Phase Optimized Selectivity Liquid Chromatography for the development of herbal fingerprints to detect targeted plants in plant food supplements. Talanta 2017; 170:441-450. [DOI: 10.1016/j.talanta.2017.04.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 04/07/2017] [Accepted: 04/11/2017] [Indexed: 11/16/2022]
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11
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Alvarez-Segura T, Camacho-Molinero C, Torres-Lapasió JR, García-Alvarez-Coque MC. Analysis of amino acids using serially coupled columns. J Sep Sci 2017; 40:2741-2751. [PMID: 28520236 DOI: 10.1002/jssc.201700334] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 05/05/2017] [Accepted: 05/08/2017] [Indexed: 11/10/2022]
Abstract
Single conventional columns in reversed-phase liquid chromatography are insufficient for analysing the isoindoles of primary amino acids due to their limited functionality. An interesting possibility for increasing the separation power is the combination of several columns of different nature, where the length is modified by coupling small segments. This approach may require a considerable investment to have multiple lengths for each stationary phase. However, the combination of only two columns of fixed length can be enough to resolve satisfactorily relatively complex mixtures, provided that an optimised gradient program is applied. In this work, a mixture of 19 primary amino acid isoindoles found in proteins was analysed. Four stationary phases were assayed: C18, pentafluorophenyl-C18, C4 and cyano. The mixture of isoindoles was successfully resolved in practical times using a pentafluorophenyl-C18 column coupled to a C4 column, in spite of the extremely poor performance obtained when each column is used isolatedly, independently of the length. The extreme diversity in the polarities of the isoindoles and the need of extrapolating the retention behaviour in certain regions of the solvent content domain makes the modelling of the retention behaviour of the isoindoles particularly difficult. Nevertheless, the predicted optimal separations were very satisfactory.
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12
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Stationary phase modulation in liquid chromatography through the serial coupling of columns: A review. Anal Chim Acta 2016; 923:1-23. [DOI: 10.1016/j.aca.2016.03.040] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 03/17/2016] [Accepted: 03/21/2016] [Indexed: 01/22/2023]
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13
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Deconinck E, Ghijs L, Kamugisha A, Courselle P. Comparison of three development approaches for Stationary Phase Optimised Selectivity Liquid Chromatography based screening methods Part II: A group of structural analogues (PDE-5 inhibitors in food supplements). Talanta 2016; 148:346-55. [DOI: 10.1016/j.talanta.2015.10.065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 10/05/2015] [Accepted: 10/23/2015] [Indexed: 10/22/2022]
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14
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Comparison of three development approaches for Stationary Phase Optimised Selectivity Liquid Chromatography based screening methods Part I: A heterogeneous group of molecules (slimming agents in food supplements). Talanta 2016; 148:518-28. [DOI: 10.1016/j.talanta.2015.10.066] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 10/13/2015] [Accepted: 10/23/2015] [Indexed: 11/21/2022]
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15
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Development of a Stationary Phase Optimised Selectivity Liquid Chromatography based screening method for adulterations of food supplements for the treatment of pain. Talanta 2015; 138:240-246. [DOI: 10.1016/j.talanta.2015.03.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/05/2015] [Accepted: 03/06/2015] [Indexed: 11/24/2022]
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16
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Delahaye S, Lynen F. Implementing Stationary-Phase Optimized Selectivity in Supercritical Fluid Chromatography. Anal Chem 2014; 86:12220-8. [DOI: 10.1021/ac503313j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Sander Delahaye
- Separation Science Group,
Department of Organic and Macromolecular Chemistry, Universiteit Gent, Krijgslaan
281 S4-bis, B-9000 Gent, Belgium
| | - Frédéric Lynen
- Separation Science Group,
Department of Organic and Macromolecular Chemistry, Universiteit Gent, Krijgslaan
281 S4-bis, B-9000 Gent, Belgium
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Li D, Dück R, Schmitz OJ. The advantage of mixed-mode separation in the first dimension of comprehensive two-dimensional liquid-chromatography. J Chromatogr A 2014; 1358:128-35. [DOI: 10.1016/j.chroma.2014.06.086] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 05/23/2014] [Accepted: 06/25/2014] [Indexed: 01/12/2023]
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18
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Simultaneous optimization of mobile phase composition, column nature and length to analyse complex samples using serially coupled columns. J Chromatogr A 2013; 1317:39-48. [DOI: 10.1016/j.chroma.2013.06.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 05/29/2013] [Accepted: 06/14/2013] [Indexed: 11/20/2022]
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19
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Ortiz-Bolsico C, Torres-Lapasió J, Ruiz-Ángel M, García-Álvarez-Coque M. Comparison of two serially coupled column systems and optimization software in isocratic liquid chromatography for resolving complex mixtures. J Chromatogr A 2013; 1281:94-105. [DOI: 10.1016/j.chroma.2013.01.064] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 01/10/2013] [Accepted: 01/11/2013] [Indexed: 10/27/2022]
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20
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Chen K, Lynen F, Szucs R, Hanna-Brown M, Sandra P. Gradient stationary phase optimized selectivity liquid chromatography with conventional columns. Analyst 2013; 138:2914-23. [DOI: 10.1039/c3an36797e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Yeman H, Nicholson TM, Friebolin V, Steinhauser L, Matyska MT, Pesek JJ, Albert K. Time-dependent column performance of cholesterol-based stationary phases for HPLC by LC characterization and solid-state NMR spectroscopy. J Sep Sci 2012; 35:1582-8. [DOI: 10.1002/jssc.201200079] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Helen Yeman
- Institute of Organic Chemistry; University of Tuebingen; Tuebingen Germany
| | - Tim M. Nicholson
- Institute of Organic Chemistry; University of Tuebingen; Tuebingen Germany
| | - Volker Friebolin
- Institute of Organic Chemistry; University of Tuebingen; Tuebingen Germany
| | - Lisa Steinhauser
- Institute of Organic Chemistry; University of Tuebingen; Tuebingen Germany
| | - Maria T. Matyska
- Department of Chemistry; San Jose State University; San Jose CA USA
| | - Joseph J. Pesek
- Department of Chemistry; San Jose State University; San Jose CA USA
| | - Klaus Albert
- Institute of Organic Chemistry; University of Tuebingen; Tuebingen Germany
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Oertel R, Pietsch J, Arenz N, Zeitz SG, Goltz L, Kirch W. Simultaneous determination of drugs in human autopsy material using phase-optimized liquid chromatography. Biomed Chromatogr 2012; 26:1608-16. [DOI: 10.1002/bmc.2739] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Accepted: 02/27/2012] [Indexed: 11/10/2022]
Affiliation(s)
- R. Oertel
- Institute of Clinical Pharmacology, Medical Faculty Carl Gustav Carus; Technical University Dresden; Fiedlerstr. 27; 01307; Dresden; Germany
| | - J. Pietsch
- Institute of Legal Medicine, Medical Faculty Carl Gustav Carus; Technical University Dresden
| | - N. Arenz
- Institute of Clinical Pharmacology, Medical Faculty Carl Gustav Carus; Technical University Dresden; Fiedlerstr. 27; 01307; Dresden; Germany
| | - S. G. Zeitz
- Institute of Clinical Pharmacology, Medical Faculty Carl Gustav Carus; Technical University Dresden; Fiedlerstr. 27; 01307; Dresden; Germany
| | - L. Goltz
- Institute of Clinical Pharmacology, Medical Faculty Carl Gustav Carus; Technical University Dresden; Fiedlerstr. 27; 01307; Dresden; Germany
| | - W. Kirch
- Institute of Clinical Pharmacology, Medical Faculty Carl Gustav Carus; Technical University Dresden; Fiedlerstr. 27; 01307; Dresden; Germany
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Chen K, Lynen F, De Beer M, Hitzel L, Ferguson P, Hanna-Brown M, Sandra P. Selectivity optimization in green chromatography by gradient stationary phase optimized selectivity liquid chromatography. J Chromatogr A 2010; 1217:7222-30. [DOI: 10.1016/j.chroma.2010.09.029] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 08/31/2010] [Accepted: 09/08/2010] [Indexed: 11/29/2022]
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24
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Lu J, Ji M, Ludewig R, Scriba GK, Chen DY. Application of phase optimized liquid chromatography to oligopeptide separations. J Pharm Biomed Anal 2010; 51:764-7. [DOI: 10.1016/j.jpba.2009.09.036] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2009] [Revised: 09/21/2009] [Accepted: 09/22/2009] [Indexed: 10/20/2022]
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25
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Zedda M, Tuerk J, Teutenberg T, Peil S, Schmidt T. A strategy for the systematic development of a liquid chromatographic mass spectrometric screening method for polymer electrolyte membrane degradation products using isocratic and gradient phase optimized liquid chromatography. J Chromatogr A 2009; 1216:8910-7. [DOI: 10.1016/j.chroma.2009.10.052] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 10/14/2009] [Accepted: 10/16/2009] [Indexed: 10/20/2022]
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26
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Johns C, Shellie RA, Pohl CA, Haddad PR. Two-dimensional ion chromatography using tandem ion-exchange columns with gradient-pulse column switching. J Chromatogr A 2009; 1216:6931-7. [DOI: 10.1016/j.chroma.2009.08.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Revised: 08/03/2009] [Accepted: 08/10/2009] [Indexed: 10/20/2022]
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27
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Beer M, Lynen F, Hanna-Brown M, Sandra P. Multiple Step Gradient Analysis in Stationary Phase Optimised Selectivity LC for the Analysis of Complex Mixtures. Chromatographia 2009. [DOI: 10.1365/s10337-008-0942-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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