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Li J, Qiu D, Li F, Kang J. Preparation of poly(N-vinylpyrrolidone-co-pentaerythritol triacrylate) monolithic column for hydrophilic interaction chromatography. J Sep Sci 2023; 46:e2201033. [PMID: 36774335 DOI: 10.1002/jssc.202201033] [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: 12/18/2022] [Revised: 02/02/2023] [Accepted: 02/06/2023] [Indexed: 02/13/2023]
Abstract
A method for the preparation of poly(N-vinylpyrrolidone-co-pentaerythritol triacrylate copolymerization)-based monolithic capillary column was reported for the separation of polar small molecular weight compounds with nano-liquid chromatography in hydrophilic interaction chromatography mode. The monolithic columns were prepared by in situ copolymerization of N-vinylpyrrolidone and a cross-linker pentaerythritol triacrylate in a binary porogenic agent consisting of methanol and water. The composition of the polymerization solution was systematically optimized in terms of column permeability, theoretical plate number, asymmetric factor, and retention factor. A typical hydrophilic chromatography retention mechanism was observed with a mobile phase composed of a high content of organic solvent. The preparation method is simple and robust, the precursor N-vinylpyrrolidone is chemically stable, cheap, and easily available. The N-vinylpyrrolidone-based hydrophilic interaction chromatography stationary phase displays satisfactory separation selectivity for a range of polar test analytes, including benzoic acid derivatives, nucleosides, and phenols.
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Affiliation(s)
- Jing Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, P. R. China.,School of Physical Science and Technology, Shanghai Tech University, Shanghai, P. R. China
| | - Danye Qiu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, P. R. China
| | - Feng Li
- School of Chemical Engineering, Xi'an Key Laboratory of Food Safety Testing and Risk Assessment, Xi'an University, Xi'an, P. R. China
| | - Jingwu Kang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, P. R. China.,School of Physical Science and Technology, Shanghai Tech University, Shanghai, P. R. China
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2
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Rajendiran V, El Rassi Z. Reversed-phase capillary electrochromatography of pre-column derivatized mono- and oligosaccharides with three different ultraviolet absorbing tags. J Chromatogr A 2022; 1671:463025. [PMID: 35421735 DOI: 10.1016/j.chroma.2022.463025] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/27/2022] [Accepted: 04/03/2022] [Indexed: 10/18/2022]
Abstract
In this research report, an in house developed octadecyl monolithic (ODM) column has been exploited in the reversed-phase capillary electrochromatography (RP-CEC) of precolumn derivatized mono- and oligosaccharides with three different tagging agents, namely 1-naphthylamine (1-NA), 2-aminoanthracene (2-AA) and 3-amino-2,7-naphthalenedisulfonic acid (ANDSA). These three derivatizing agents, which differed in their charges, nonpolar characters and optical absorption properties, led to different RP-CEC elution patterns and UV detection signals. In fact, the limit of detection of the derivatized sugars were 50 µM for the ANDSA- and 1-NA-sugar derivatives and 35 µM for the 2-AA-sugar derivatives due to the presence of three fused aromatic rings in 2-AA versus 2 fused rings in the 1-NA and ANDSA tags. Furthermore, while the longer ANDSA-oligosaccharides eluted later than the shorter ones and the ANDSA-monosaccharides, 1-NA- and 2-AA-sugar derivatives necessitated the presence of borate ions at alkaline pH in the mobile phase to form in situ charged derivatives to facilitate their separation by RP-CEC, and the elution order was the reversal of that observed with the ANDSA-sugar derivatives; that is the mono- eluted later than the larger size oligosaccharides. In addition, plots of log tR vs. number of glucose residues (nGlc) for derivatized glucose and maltooligosaccharides yielded straight lines with slopes representing log η where η is the retention time modulus (i.e., ratio of retention time of two neighboring derivatives differing in one glucosyl residue). In the case of 1-NA and 2-AA derivatives, η was smaller than unity while it was greater than unity in the case of ANDSA-sugar derivatives because the elution occurred in the order of decreasing size of the homologous sugar derivatives in the former than in the later derivatives. The prepared ODM column was stable for more than a month of continuous use, a fact that allowed a good repeatability for intraday and interday analyzes.
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Affiliation(s)
- Vaithilingam Rajendiran
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078-3071, United States
| | - Z El Rassi
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078-3071, United States.
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3
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Hajba L, Guttman A. Recent Advances in Capillary Electrochromatography of Proteins and Carbohydrates in the Biopharmaceutical and Biomedical Field. Crit Rev Anal Chem 2020; 51:289-298. [PMID: 32022586 DOI: 10.1080/10408347.2020.1720589] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Capillary electrochromatography (CEC) is a powerful hybrid separation technique that combines capillary electrophoresis and capillary chromatography, capable to address the analytical challenges of proteomics and glycomics. The focus of this paper is to review the recent developments in capillary electrochromatography of proteins and carbohydrates. The different column types applied in capillary electrochromatography such as packed bed, open tubular and monoliths are conferred in detail with respective separation examples. A comprehensive comparison is also given listing the mostly utilized coating methods, stationary phase materials and column preparation methods. The choice of porogenic solvent combinations for monolithic column fabrication is thoroughly discussed, paying close attention to the fine tuning options for the separation driving electroosmotic flow. Application examples of CEC in process analytical technology for the biopharmaceutical and biomarker discovery in the biomedical fields are also given.
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Affiliation(s)
- L Hajba
- Translational Glycomics Research Group, Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Veszprem, Hungary
| | - A Guttman
- Translational Glycomics Research Group, Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Veszprem, Hungary.,Horváth Csaba Memorial Laboratory for Bioseparation Sciences, Research Center for Molecular Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
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4
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Mansour FR, Waheed S, Paull B, Maya F. Porogens and porogen selection in the preparation of porous polymer monoliths. J Sep Sci 2019; 43:56-69. [DOI: 10.1002/jssc.201900876] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 09/26/2019] [Accepted: 09/29/2019] [Indexed: 01/10/2023]
Affiliation(s)
- Fotouh R. Mansour
- Department of Pharmaceutical Analytical ChemistryFaculty of PharmacyTanta University Tanta Egypt
- Pharmaceutical Services CenterFaculty of PharmacyTanta University Tanta Egypt
| | - Sidra Waheed
- Australian Centre for Research on Separation Science (ACROSS)School of Natural Sciences, ChemistryUniversity of Tasmania Hobart Australia
- ARC Centre of Excellence for Electromaterials Science (ACES) School of Natural Sciences, ChemistryUniversity of Tasmania Hobart Australia
| | - Brett Paull
- Australian Centre for Research on Separation Science (ACROSS)School of Natural Sciences, ChemistryUniversity of Tasmania Hobart Australia
- ARC Centre of Excellence for Electromaterials Science (ACES) School of Natural Sciences, ChemistryUniversity of Tasmania Hobart Australia
| | - Fernando Maya
- Australian Centre for Research on Separation Science (ACROSS)School of Natural Sciences, ChemistryUniversity of Tasmania Hobart Australia
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5
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Ganewatta N, El Rassi Z. Monolithic capillary columns consisting of poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) and their diol derivatives with incorporated hydroxyl functionalized multiwalled carbon nanotubes for reversed-phase capillary electrochromatography. Analyst 2018; 143:270-279. [PMID: 29181474 DOI: 10.1039/c7an01426k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Two types of monolithic stationary phases with incorporated hydroxyl functionalized multiwalled carbon nanotubes (OH-MWCNTs) were introduced and evaluated, namely, the poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) monolith, denoted as poly(GMA-co-EDMA), and a diol derivative of the poly(GMA-co-EDMA) monolith. The diol derivative monolith was obtained by subjecting the poly(GMA-co-EDMA) monolith with physically incorporated OH-MWCNTs to an acid treatment with 0.1 M sulfuric acid at a moderate temperature of 50 °C for a total of 7.5 h. Also, the poly(GMA-co-EDMA) monolith with both physically and covalently incorporated OH-MWCNTs was prepared by subjecting the physically incorporated monolithic column to a Lewis acid catalyzed reaction in the presence of BF3 in order to react some of the OH-MWCNTs with the epoxy rings of the poly(GMA-co-EDMA) monolith. In all cases, the OH-MWCNTs were subjected to high power sonication at an output power of 10 W for 15 min with the aim of better dispersing the incorporated nanotubes into the monoliths under investigation. In fact, high power sonication yielded columns with a relatively higher plate count (∼2 fold increase) when compared to low power sonication. While the incorporation of OH-MWCNTs into the poly(GMA-co-EDMA) monolith acted as an amendment boosting the nonpolar character of the monolith and providing additional π-π interactions, the diol derivative monolith with its polar backbone character acted nearly as a support for the OH-MWCNT stationary phase giving rise to a carbon nanotube sorbent providing hydrophobic and π-π interactions via the incorporated OH-MWCNTs. These two kinds of columns were evaluated using alkylbenzenes, toluene derivatives, aniline compounds, phenols and polyaromatic hydrocarbons.
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Affiliation(s)
- Nisansala Ganewatta
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078-3071, USA.
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6
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Gökaltun A, Tuncel A. Post-polymerization modification of a new reactive monolith for reversed phase and hydrophilic interaction capillary electrochromatography of neutral, polar, and biologically active compounds. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4320] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Aslıhan Gökaltun
- Hacettepe University; Chemical Engineering Department; Ankara 06532 Turkey
| | - Ali Tuncel
- Hacettepe University; Chemical Engineering Department; Ankara 06532 Turkey
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7
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Rathnasekara R, El Rassi Z. Polar silica-based stationary phases. Part II- Neutral silica stationary phases with surface bound maltose and sorbitol for hydrophilic interaction liquid chromatography. J Chromatogr A 2017; 1508:24-32. [PMID: 28599861 DOI: 10.1016/j.chroma.2017.05.059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 05/06/2017] [Accepted: 05/29/2017] [Indexed: 12/15/2022]
Abstract
Two neutral polyhydroxylated silica bonded stationary phases, namely maltose-silica (MALT-silica) and sorbitol-silica (SOR-silica), have been introduced and chromatographically characterized in hydrophilic interaction liquid chromatography (HILIC) for a wide range of polar compounds. The bonding of the maltose and sorbitol to the silica surface was brought about by first converting bare silica to an epoxy-activated silica surface via reaction with γ-glycidoxypropyltrimethoxysilane (GPTMS) followed by attaching maltose and sorbitol to the epoxy surface in the presence of the Lewis acid catalyst BF3.ethereate. Both silica based columns offered the expected retention characteristics usually encountered for neutral polar surface. The retention mechanism is majorly based on solute' differential partitioning between an organic rich hydro-organic mobile phase (e.g., ACN rich mobile phase) and an adsorbed water layer on the surface of the stationary phase although additional hydrogen bonding was also responsible in some cases for solute retention. The MALT-silica column proved to be more hydrophilic and offered higher retention, separation efficiency and resolution than the SOR-silica column among the tested polar solutes such as derivatized mono- and oligosaccharides, weak phenolic acids, cyclic nucleotide monophosphate and nucleotide-5'-monophosphates, and weak bases, e.g., nucleobases and nucleosides.
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Affiliation(s)
- Renuka Rathnasekara
- Oklahoma State University, Department of Chemistry, Stillwater, OK, 74078-3071, USA
| | - Ziad El Rassi
- Oklahoma State University, Department of Chemistry, Stillwater, OK, 74078-3071, USA.
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8
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Postpolymerization modification of a hydroxy monolith precursor. Part III. Activation of poly(hydroxyethyl methacrylate-co-pentaerythritol triacrylate) monolith with epoxy functionalities followed by bonding of glycerol, polyamines, and hydroxypropyl-β-cy. Electrophoresis 2016; 37:3178-3185. [DOI: 10.1002/elps.201600326] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 08/29/2016] [Accepted: 09/01/2016] [Indexed: 12/29/2022]
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9
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Yamamoto S, Kinoshita M, Suzuki S. Current landscape of protein glycosylation analysis and recent progress toward a novel paradigm of glycoscience research. J Pharm Biomed Anal 2016; 130:273-300. [PMID: 27461579 DOI: 10.1016/j.jpba.2016.07.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Revised: 07/09/2016] [Accepted: 07/09/2016] [Indexed: 12/25/2022]
Abstract
This review covers the basics and some applications of methodologies for the analysis of glycoprotein glycans. Analytical techniques used for glycoprotein glycans, including liquid chromatography (LC), capillary electrophoresis (CE), mass spectrometry (MS), and high-throughput analytical methods based on microfluidics, were described to supply the essentials about biopharmaceutical and biomarker glycoproteins. We will also describe the MS analysis of glycoproteins and glycopeptides as well as the chemical and enzymatic releasing methods of glycans from glycoproteins and the chemical reactions used for the derivatization of glycans. We hope the techniques have accommodated most of the requests from glycoproteomics researchers.
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Affiliation(s)
- Sachio Yamamoto
- Faculty of Pharmaceutical Sciences, Kinki University, 3-4-1, Kowakae, Higashi-osaka, Osaka, 577-8502, Japan.
| | - Mitsuhiro Kinoshita
- Faculty of Pharmaceutical Sciences, Kinki University, 3-4-1, Kowakae, Higashi-osaka, Osaka, 577-8502, Japan
| | - Shigeo Suzuki
- Faculty of Pharmaceutical Sciences, Kinki University, 3-4-1, Kowakae, Higashi-osaka, Osaka, 577-8502, Japan
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10
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Qiu D, Li F, Zhang M, Kang J. Preparation of phosphorylcholine-based hydrophilic monolithic column and application for analysis of drug-related impurities with capillary electrochromatography. Electrophoresis 2016; 37:1725-32. [PMID: 27062582 DOI: 10.1002/elps.201600066] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 03/22/2016] [Accepted: 03/22/2016] [Indexed: 12/30/2022]
Abstract
A hydrophilic monolithic CEC column was prepared by thermal copolymerization of zwitterionic monomer 2-methacryloyloxyethyl phosphorylcholine (MPC), pentaerythritol triacrylate (PETA), either methacrylatoethyl trimethyl ammonium chloride (META) or sodium 2-methylpropene-1-sulfonate (MPS) in a polar binary porogen consisting of methanol and THF. A typical hydrophilic interaction LC retention mechanism was observed for low-molecular weight polar compounds including amides, nucleotides, and nucleosides in the separation mode of hydrophilic interaction CEC, when high content of ACN (>60%) was used as the mobile phase. The effect of the electrostatic interaction between the analytes and the stationary phase was found to be negligible. The poly(MPC-co-PETA-co-META or MPS) monolithic columns have an average column efficiency of 40 000 plates/m and displayed with a satisfactory repeatability in terms of migration time and peak areas. Finally, the column was successfully applied to determine the impurities of a positively charged drug pramipexole which are often separated by ion pair RP chromatography due to their high hydrophilicity. All four components can be baseline separated within 5 min with BGE consisting of ACN/20 mM ammonium formate buffer (pH 3.0; 80/20).
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Affiliation(s)
- Danye Qiu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, P. R. China
| | - Feng Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, P. R. China
| | - Mingyu Zhang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, P. R. China
| | - Jingwu Kang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, P. R. China
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, P. R. China
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11
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Kebe SI, Ben Boubaker M, Guerrouache M, Carbonnier B. Thiol–ene click chemistry for the design of diol porous monoliths with hydrophilic surface interaction ability: a capillary electrochromatography study. NEW J CHEM 2016. [DOI: 10.1039/c6nj00423g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Thiol–ene click chemistry provides an efficient surface grafting strategy for designing diol monoliths meant for hydrophilic interaction capillary electrochromatography.
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12
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Pepsin immobilization on an aldehyde-modified polymethacrylate monolith and its application for protein analysis. J Biosci Bioeng 2015; 119:505-10. [DOI: 10.1016/j.jbiosc.2014.10.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 10/22/2014] [Accepted: 10/23/2014] [Indexed: 12/16/2022]
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13
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Kip Ç, Erkakan D, Gökaltun A, Çelebi B, Tuncel A. Synthesis of a reactive polymethacrylate capillary monolith and its use as a starting material for the preparation of a stationary phase for hydrophilic interaction chromatography. J Chromatogr A 2015; 1396:86-97. [PMID: 25900740 DOI: 10.1016/j.chroma.2015.04.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 04/01/2015] [Accepted: 04/02/2015] [Indexed: 12/18/2022]
Abstract
Poly(3-chloro-2-hydroxypropyl methacrylate-co-ethylene dimethacrylate), poly(HPMA-Cl-co-EDMA) capillary monolith was proposed as a reactive starting material with tailoring flexibility for the preparation of monolithic stationary phases. The reactive capillary monolith was synthesized by free radical copolymerization of 3-chloro-2-hydroxypropyl methacrylate (HPMA-Cl) and ethylene dimethacrylate (EDMA). The mean pore size, the specific surface area and the permeability of poly(HPMA-Cl-co-EDMA) monoliths were controlled by adjusting porogen/monomer volume ratio, porogen composition and polymerization temperature. The porogen/monomer volume ratio was found as the most effective factor controlling the porous properties of poly(HPMA-Cl-co-EDMA) monolith. Triethanolamine (TEA-OH) functionalized polymethacrylate monoliths were prepared by using the reactive chloropropyl group of poly(HPMA-Cl-co-EDMA) monolith via one-pot and simple post-functionalization process. Poly(HPMA-Cl-co-EDMA) monolith reacted with TEA-OH was evaluated as a stationary phase in nano-hydrophilic interaction chromatography (nano-HILIC). Nucleotides, nucleosides and benzoic acid derivatives were satisfactorily separated with the plate heights up to 20μm. TEA-OH attached-poly(HPMA-Cl-co-EDMA) monolith showed a reproducible and stable retention behaviour in nano-HILIC runs. However, a decrease in the column performance (i.e. an increase in the plate height) was observed with the increasing retention factor. Hence "retention-dependent column efficiency" behaviour was shown for HILIC mode using the chromatographic data collected with the polymer based monolith synthesized.
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Affiliation(s)
- Çiğdem Kip
- Hacettepe University, Chemical Engineering Department, Beytepe/Ankara, Turkey
| | - Damla Erkakan
- Hacettepe University, Chemical Engineering Department, Beytepe/Ankara, Turkey
| | - Aslıhan Gökaltun
- Hacettepe University, Chemical Engineering Department, Beytepe/Ankara, Turkey
| | - Bekir Çelebi
- Hacettepe University, Chemical Engineering Department, Beytepe/Ankara, Turkey
| | - Ali Tuncel
- Hacettepe University, Chemical Engineering Department, Beytepe/Ankara, Turkey; Hacettepe University, Division of Nanotechnology & Nanomedicine, Ankara, Turkey.
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14
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Development of Monolithic Column Materials for the Separation and Analysis of Glycans. CHROMATOGRAPHY 2015. [DOI: 10.3390/chromatography2010020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Gunasena DN, El Rassi Z. Neutral, charged and stratified polar monoliths for hydrophilic interaction capillary electrochromatography. J Chromatogr A 2013; 1317:77-84. [PMID: 23972465 DOI: 10.1016/j.chroma.2013.07.100] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Revised: 07/23/2013] [Accepted: 07/26/2013] [Indexed: 10/26/2022]
Abstract
Novel polar monoliths were introduced for hydrophilic interaction capillary electrochromatography (HI-CEC). In one case, a neutral polar monolith resulted from the in situ polymerization of glyceryl methacrylate (GMM) and pentaerythritol triacrylate (PETA) in a ternary porogenic solvent. GMM and PETA possess hydroxyl functional groups, which impart the monolith with hydrophilic interaction sites. This monolith is designated as hydroxy monolith. Although the hydroxy monolith is neutral and void of fixed charges on the surface, a relatively strong cathodal EOF was observed due to the electric double layer formed by the adsorption of ions from the mobile phase, producing a bulk mobile phase flow. The second monolith is charged and referred to as AP-monolith that possesses amine/amide functionalities on its surface, and was prepared by the in situ polymerization of N-(3-aminopropyl) methacrylamide hydrochloride (NAPM) and ethylene dimethacrylate (EDMA) in the presence of cyclohexanol, dodecanol and methanol as porogens. Over the pH range studied a strong anodal EOF was observed. The AP-monolith was further exploited in HI-CEC by modifying its surface with neutral mono- and oligosaccharides to produce a series of the so called sugar modified AP-monoliths (SMAP-monolith), which are considered as stratified hydrophilic monoliths possessing a sub-layer of polar amine/amide groups and a top layer of sugar (a polyhydroxy top layer). The SMAP-monoliths can be viewed as a blend of both the hydroxy monolith and the AP-monolith. The polarity of the various monoliths seems to follow the order: hydroxy monolith<AP-monolith<SMAP-monolith. The novel monoliths were characterized over a wide range of elution conditions with a variety of polar solutes including phenols, substituted phenols, nucleic acid bases, nucleosides and nucleotides.
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Affiliation(s)
- Dilani N Gunasena
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078-3071, United States
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16
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Mittermayr S, Bones J, Guttman A. Unraveling the Glyco-Puzzle: Glycan Structure Identification by Capillary Electrophoresis. Anal Chem 2013; 85:4228-38. [DOI: 10.1021/ac4006099] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Stefan Mittermayr
- Horváth
Laboratory of
Bioseparation Sciences, Regional Center for Molecular Medicine, University of Debrecen, Debrecen, Hungary
| | - Jonathan Bones
- NIBRT−The National Institute for Bioprocessing Research and Training, Fosters Avenue, Mount Merrion, Blackrock, Co. Dublin, Ireland
| | - András Guttman
- Horváth
Laboratory of
Bioseparation Sciences, Regional Center for Molecular Medicine, University of Debrecen, Debrecen, Hungary
- MTA-PE Translational Glycomics
Group, University of Pannonia, Veszprem,
Hungary
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17
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Pfaunmiller EL, Paulemond ML, Dupper CM, Hage DS. Affinity monolith chromatography: a review of principles and recent analytical applications. Anal Bioanal Chem 2013; 405:2133-45. [PMID: 23187827 PMCID: PMC3578177 DOI: 10.1007/s00216-012-6568-4] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 11/12/2012] [Indexed: 10/27/2022]
Abstract
Affinity monolith chromatography (AMC) is a type of liquid chromatography that uses a monolithic support and a biologically related binding agent as a stationary phase. AMC is a powerful method for the selective separation, analysis, or study of specific target compounds in a sample. This review discusses the basic principles of AMC and recent developments and applications of this method, with particular emphasis being given to work that has appeared in the last 5 years. Various materials that have been used to prepare columns for AMC are examined, including organic monoliths, silica monoliths, agarose monoliths, and cryogels. These supports have been used in AMC for formats that have ranged from traditional columns to disks, microcolumns, and capillaries. Many binding agents have also been employed in AMC, such as antibodies, enzymes, proteins, lectins, immobilized metal ions, and dyes. Some applications that have been reported with these binding agents in AMC are bioaffinity chromatography, immunoaffinity chromatography or immunoextraction, immobilized-metal-ion affinity chromatography, dye-ligand affinity chromatography, chiral separations, and biointeraction studies. Examples are presented from fields that include analytical chemistry, pharmaceutical analysis, clinical testing, and biotechnology. Current trends and possible directions in AMC are also discussed.
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Affiliation(s)
| | | | - Courtney M. Dupper
- Department of Chemistry University of Nebraska Lincoln, NE 68588-0304, USA
| | - David S. Hage
- Department of Chemistry University of Nebraska Lincoln, NE 68588-0304, USA
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18
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Aydoğan C, Denizli A. Preparation and electrochromatographic characterization of methacrylate-based weak cation exchange columns for capillary electrochromatography. Analyst 2013; 138:2118-25. [DOI: 10.1039/c3an36377e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Pfaunmiller EL, Hartmann M, Dupper CM, Soman S, Hage DS. Optimization of human serum albumin monoliths for chiral separations and high-performance affinity chromatography. J Chromatogr A 2012; 1269:198-207. [PMID: 23010249 PMCID: PMC3578315 DOI: 10.1016/j.chroma.2012.09.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 09/03/2012] [Accepted: 09/04/2012] [Indexed: 01/19/2023]
Abstract
Various organic-based monoliths were prepared and optimized for immobilization of the protein human serum albumin (HSA) as a binding agent for chiral separations and high-performance affinity chromatography. These monoliths contained co-polymers based on glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EDMA) or GMA and trimethylolpropane trimethacrylate (TRIM). A mixture of cyclohexanol and 1-dodecanol was used as the porogen, with the ratio of these solvents being varied along with the polymerization temperature to generate a library of monoliths. These monoliths were used with both the Schiff base and epoxy immobilization methods and measured for their final content of HSA. Monoliths showing the highest protein content were further evaluated in chromatographic studies using R/S-warfarin and d/l-tryptophan as model chiral solutes. A 2.6-2.7-fold increase in HSA content was obtained in the final monoliths when compared to similar HSA monoliths prepared according to the literature. The increased protein content made it possible for the new monoliths to provide higher retention and/or two-fold faster separations for the tested solutes when using 4.6mm i.d.× 50 mm columns. These monoliths were also used to create 4.6mm i.d.× 10 mm HSA microcolumns that could separate the same chiral solutes in only 1.5-6.0 min. The approaches used in this study could be extended to the separation of other chiral solutes and to the optimization of organic monoliths for use with additional proteins as binding agents.
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Affiliation(s)
| | - Mahli Hartmann
- Chemistry Department, University of Nebraska, Lincoln, NE, USA
| | | | - Sony Soman
- Chemistry Department, University of Nebraska, Lincoln, NE, USA
| | - David S. Hage
- Chemistry Department, University of Nebraska, Lincoln, NE, USA
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20
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Chen XJ, Dinh NP, Zhao J, Wang YT, Li SP, Svec F. Effect of ion adsorption on CEC separation of small molecules using hypercrosslinked porous polymer monolithic capillary columns. J Sep Sci 2012; 35:1502-5. [PMID: 22740260 DOI: 10.1002/jssc.201200138] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Both poly(styrene-co-vinylbenzyl chloride-co-divinylbenzene) and poly(4-methylstyrene-co-vinylbenzyl chloride-co-divinylbenzene) monolithic columns have been hypercrosslinked and for the first time used to achieve capillary electrochromatographic separations. Although these columns do not contain ionizable functionalities, electroosmotic flow was observed due to adsorption of ions from a buffer solution contained in the mobile phase on the surface of the hydrophobic polymer. An increase of more than one order of magnitude was observed with the use of both monolithic polymers. The hypercrosslinking reaction creates a large surface area thus enabling adsorption of a much larger number of ions. Alkylbenzenes were successfully separated using the hypercrosslinked monolithic columns.
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Affiliation(s)
- Xiao-Jia Chen
- State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Macao SAR, P R China
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21
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Li Y, Lee ML, Jin J, Chen J. Preparation and characterization of neutral poly(ethylene glycol) methacrylate-based monolith for normal phase liquid chromatography. Talanta 2012; 99:91-8. [DOI: 10.1016/j.talanta.2012.04.066] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 04/20/2012] [Accepted: 04/30/2012] [Indexed: 11/26/2022]
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22
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Arrua RD, Talebi M, Causon TJ, Hilder EF. Review of recent advances in the preparation of organic polymer monoliths for liquid chromatography of large molecules. Anal Chim Acta 2012; 738:1-12. [DOI: 10.1016/j.aca.2012.05.052] [Citation(s) in RCA: 112] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 05/23/2012] [Accepted: 05/28/2012] [Indexed: 12/17/2022]
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23
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Selvaraju S, El Rassi Z. Tandem lectin affinity chromatography monolithic columns with surface immobilised concanavalin A, wheat germ agglutinin and Ricinus communis
agglutinin-I for capturing sub-glycoproteomics from breast cancer and disease-free human sera. J Sep Sci 2012; 35:1785-95. [DOI: 10.1002/jssc.201200230] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Ziad El Rassi
- Department of Chemistry; Oklahoma State University; Stillwater OK USA
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24
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Li Y, Aggarwal P, Tolley H, Lee M. Organic Monolith Column Technology for Capillary Liquid Chromatography. ADVANCES IN CHROMATOGRAPHY 2012; 50:237-80. [DOI: 10.1201/b11636-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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25
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Aydoğan C, Tuncel A, Denizli A. Polymethacrylate-based monolithic capillary column with weak cation exchange functionalities for capillary electrochromatography. J Sep Sci 2012; 35:1010-6. [DOI: 10.1002/jssc.201100927] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Cemil Aydoğan
- Department of Chemistry; Biochemistry division; Hacettepe University; Ankara Turkey
| | - Ali Tuncel
- Department of Chemical Engineering; Hacettepe University; Ankara Turkey
| | - Adil Denizli
- Department of Chemistry; Biochemistry division; Hacettepe University; Ankara Turkey
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26
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Gunasena DN, El Rassi Z. Organic monoliths for hydrophilic interaction electrochromatography/chromatography and immunoaffinity chromatography. Electrophoresis 2012; 33:251-61. [PMID: 22147366 PMCID: PMC3415793 DOI: 10.1002/elps.201100523] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Revised: 10/10/2011] [Accepted: 10/14/2011] [Indexed: 12/19/2022]
Abstract
This article is aimed at providing a review of the progress made over the past decade in the preparation of polar monoliths for hydrophilic interaction LC (HILIC)/capillary electrochromatography (HI-CEC) and in the design of immuno-monoliths for immunoaffinity chromatography that are based on some of the polar monolith precursors used in HILIC/HI-CEC. In addition, this review article discusses some of the applications of polar monoliths by HILIC and HI-CEC, and the applications of immuno-monoliths. This article is by no means an exhaustive review of the literature; it is rather a survey of the recent progress made in the field with 83 references published in the past decade on the topics of HILIC and immunoaffinity chromatography monoliths.
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Affiliation(s)
- Dilani N. Gunasena
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078-3071
| | - Ziad El Rassi
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078-3071
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27
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Arrua RD, Causon TJ, Hilder EF. Recent developments and future possibilities for polymer monoliths in separation science. Analyst 2012; 137:5179-89. [DOI: 10.1039/c2an35804b] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Gunasena DN, El Rassi Z. Hydrophilic diol monolith for the preparation of immuno-sorbents at reduced nonspecific interactions. J Sep Sci 2011; 34:2097-105. [PMID: 21721125 DOI: 10.1002/jssc.201100353] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 05/21/2011] [Accepted: 05/22/2011] [Indexed: 11/10/2022]
Abstract
A polar organic polymer monolith (M1) was introduced for performing immunoaffinity chromatography (IAC) at reduced nonspecific interactions. The M1 monolith was prepared by the in situ polymerization of glyceryl methacrylate (GMM) and pentaerythritol triacrylate (PETA). Through its surface diol groups, M1 provided the functionalities to immobilize antibodies. Anti-haptoglobin antibody was used as the model antibody to study the overall behavior of the immuno monolith M1 in terms of its binding to the antigen and to evaluate its nonspecific binding with other proteins, especially the high-abundance human serum proteins. To better assess the suitability of M1 for IAC, other immuno monoliths were prepared and compared with the immuno monolith M1. Two monoliths were of the traditional ones: copolymers of (i) glycidyl methacrylate and ethylene glycol dimethacrylate (EDMA) and (ii) GMM and EDMA, referred to as M2 and M3, respectively. A fourth monolith involving the copolymerization of N-(3-aminopropyl)methacrylamide hydrochloride and EDMA (M4) was introduced to allow the site-directed immobilization of antibodies. Owing to its hydroxyl groups, the M1 exhibited negligible nonspecific hydrophobic interactions with proteins. On the other hand, M4 exhibited extensive electrostatic interactions, while the M2 and to a lesser extent M3 exhibited hydrophobic interactions.
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Affiliation(s)
- Dilani N Gunasena
- Department of Chemistry, Oklahoma State University, Stillwater, OK, USA
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29
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Cortes DF, Kabulski JL, Lazar AC, Lazar IM. Recent advances in the MS analysis of glycoproteins: Capillary and microfluidic workflows. Electrophoresis 2011; 32:14-29. [PMID: 21171110 PMCID: PMC3717299 DOI: 10.1002/elps.201000394] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 09/21/2010] [Accepted: 09/21/2010] [Indexed: 12/26/2022]
Abstract
Recent developments in bioanalytical instrumentation, MS detection, and computational data analysis approaches have provided researchers with capabilities for interrogating the complex cellular glycoproteome, to help gain a better insight into the cellular and physiological processes that are associated with a disease and to facilitate the efforts centered on identifying disease-specific biomarkers. This review describes the progress achieved in the characterization of protein glycosylation by using advanced capillary and microfluidic MS technologies. The major steps involved in large-scale glycoproteomic analysis approaches are discussed, with special emphasis given to workflows that have evolved around complex MS detection functions. In addition, quantitative analysis strategies are assessed, and the bioinformatics aspects of glycoproteomic data processing are summarized. The developments in commercial and custom fabricated microfluidic front-end platforms to ESI- and MALDI-MS instrumentation, for addressing major challenges in carbohydrate analysis such as sensitivity, throughput, and ability to perform structural characterization, are further evaluated and illustrated with relevant examples.
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Affiliation(s)
- Diego F. Cortes
- Virginia Bioinformatics Institute Virginia Polytechnic Institute and State University Washington St. Bio II/283, Blacksburg, VA 24061
| | - Jarod L. Kabulski
- Virginia Bioinformatics Institute Virginia Polytechnic Institute and State University Washington St. Bio II/283, Blacksburg, VA 24061
| | | | - Iulia M. Lazar
- Virginia Bioinformatics Institute Virginia Polytechnic Institute and State University Washington St. Bio II/283, Blacksburg, VA 24061
- Department of Biological Sciences, Virginia Polytechnic Institute and State University Washington St. Bio II/283, Blacksburg, VA 24061
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30
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Protein glycosylation analysis with capillary-based electromigrative separation techniques. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/s12566-010-0018-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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31
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Lazar IM, Lazar AC, Cortes DF, Kabulski JL. Recent advances in the MS analysis of glycoproteins: Theoretical considerations. Electrophoresis 2010; 32:3-13. [PMID: 21171109 DOI: 10.1002/elps.201000393] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 09/15/2010] [Accepted: 09/16/2010] [Indexed: 01/19/2023]
Abstract
Protein glycosylation is involved in a broad range of biological processes that regulate protein function and control cell fate. As aberrant glycosylation has been found to be implicated in numerous diseases, the study and large-scale characterization of protein glycosylation is of great interest not only to the biological and biomedical research community, but also to the pharmaceutical and biotechnology industry. Due to the complex chemical structure and differing chemical properties of the protein/peptide and glycan moieties, the analysis and structural characterization of glycoproteins has been proven to be a difficult task. Large-scale endeavors have been further limited by the dynamic outcome of the glycosylation process itself, and, occasionally, by the low abundance of glycoproteins in biological samples. Recent advances in MS instrumentation and progress in miniaturized technologies for sample handling, enrichment and separation, have resulted in robust and compelling analysis strategies that effectively address the challenges of the glycoproteome. This review summarizes the key steps that are involved in the development of efficient glycoproteomic analysis methods, and the latest innovations that led to successful strategies for the characterization of glycoproteins and their corresponding glycans. As a follow-up to this work, we review innovative capillary and microfluidic-MS workflows for the identification, sequencing and characterization of glycoconjugates.
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Affiliation(s)
- Iulia M Lazar
- Virginia Bioinformatics Institute, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.
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32
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Porous polystyrene-based monolithic materials templated by semi-interpenetrating polymer networks for capillary electrochromatography. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.10.032] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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33
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Ruhaak LR, Zauner G, Huhn C, Bruggink C, Deelder AM, Wuhrer M. Glycan labeling strategies and their use in identification and quantification. Anal Bioanal Chem 2010; 397:3457-81. [PMID: 20225063 PMCID: PMC2911528 DOI: 10.1007/s00216-010-3532-z] [Citation(s) in RCA: 359] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Revised: 01/22/2010] [Accepted: 01/22/2010] [Indexed: 12/28/2022]
Abstract
Most methods for the analysis of oligosaccharides from biological sources require a glycan derivatization step: glycans may be derivatized to introduce a chromophore or fluorophore, facilitating detection after chromatographic or electrophoretic separation. Derivatization can also be applied to link charged or hydrophobic groups at the reducing end to enhance glycan separation and mass-spectrometric detection. Moreover, derivatization steps such as permethylation aim at stabilizing sialic acid residues, enhancing mass-spectrometric sensitivity, and supporting detailed structural characterization by (tandem) mass spectrometry. Finally, many glycan labels serve as a linker for oligosaccharide attachment to surfaces or carrier proteins, thereby allowing interaction studies with carbohydrate-binding proteins. In this review, various aspects of glycan labeling, separation, and detection strategies are discussed.
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Affiliation(s)
- L. R. Ruhaak
- Biomolecular Mass Spectrometry Unit, Department of Parasitology, Leiden University Medical Center, P.O. Box 9600, 2300RC Leiden, The Netherlands
| | - G. Zauner
- Biomolecular Mass Spectrometry Unit, Department of Parasitology, Leiden University Medical Center, P.O. Box 9600, 2300RC Leiden, The Netherlands
| | - C. Huhn
- Biomolecular Mass Spectrometry Unit, Department of Parasitology, Leiden University Medical Center, P.O. Box 9600, 2300RC Leiden, The Netherlands
| | - C. Bruggink
- Biomolecular Mass Spectrometry Unit, Department of Parasitology, Leiden University Medical Center, P.O. Box 9600, 2300RC Leiden, The Netherlands
| | - A. M. Deelder
- Biomolecular Mass Spectrometry Unit, Department of Parasitology, Leiden University Medical Center, P.O. Box 9600, 2300RC Leiden, The Netherlands
| | - M. Wuhrer
- Biomolecular Mass Spectrometry Unit, Department of Parasitology, Leiden University Medical Center, P.O. Box 9600, 2300RC Leiden, The Netherlands
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34
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Karenga S, El Rassi Z. Naphthyl methacrylate-based monolithic column for RP-CEC via hydrophobic and pi interactions. Electrophoresis 2010; 31:991-1002. [PMID: 20148404 DOI: 10.1002/elps.200900700] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A neutral naphthyl methacrylate-based monolith (NMM) was introduced for RP-CEC of various aromatic compounds via hydrophobic and pi interactions. It was characterized over a wide range of elution conditions to gain insight into its RP retention mechanism toward the various solute probes under investigation. First, the NMM column exhibited cathodal EOF at various mobile phase compositions and pH suggesting that although the NMM column is void of fixed charges, it acquires a negative zeta potential. It is believed that the negative zeta potential is imparted by the adsorption of mobile phase ions to the NMM surface. The NMM column exhibited pi-pi interactions in addition to hydrophobic interactions due to the aromatic and nonpolar nature of its naphthyl ligands. In all cases, the retention of the various aromatic test solutes including PAHs, benzene derivatives, toluene derivatives, anilines and toluidine, tolunitrile and nitrotoluene positional isomers on the NMM column were compared to their retention on an octadecyl acrylate-based monolithic column. Not only were the values of the retention factors of the various solutes on the NMM column higher than those obtained on the octadecyl acrylate-based monolithic column under otherwise the same CEC conditions, but the elution orders were also different on both columns with a superior and unique selectivity exhibited by the NMM column.
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Affiliation(s)
- Samuel Karenga
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74075, USA
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35
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Svec F. Porous polymer monoliths: amazingly wide variety of techniques enabling their preparation. J Chromatogr A 2010; 1217:902-24. [PMID: 19828151 PMCID: PMC2829304 DOI: 10.1016/j.chroma.2009.09.073] [Citation(s) in RCA: 423] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Revised: 09/11/2009] [Accepted: 09/28/2009] [Indexed: 10/20/2022]
Abstract
The porous polymer monoliths went a long way since their invention two decades ago. While the first studies applied the traditional polymerization processes at that time well established for the preparation of polymer particles, creativity of scientists interested in the monolithic structures has later led to the use of numerous less common techniques. This review article presents vast variety of methods that have meanwhile emerged. The text first briefly describes the early approaches used for the preparation of monoliths comprising standard free radical polymerizations and includes their development up to present days. Specific attention is paid to the effects of process variables on the formation of both porous structure and pore surface chemistry. Specific attention is also devoted to the use of photopolymerization. Then, several less common free radical polymerization techniques are presented in more detail such as those initiated by gamma-rays and electron beam, the preparation of monoliths from high internal phase emulsions, and cryogels. Living processes including stable free radicals, atom transfer radical polymerization, and ring-opening metathesis polymerization are also discussed. The review ends with description of preparation methods based on polycondensation and polyaddition reactions as well as on precipitation of preformed polymers affording the monolithic materials.
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Affiliation(s)
- Frantisek Svec
- The Molecular Foundry, E. O. Lawrence Berkeley National Laboratory, MS 67R6110, Berkeley, CA 94720-8139, USA.
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36
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Lu M, Feng Q, Lu Q, Cai Z, Zhang L, Chen G. Preparation and evaluation of the highly cross-linked poly(1-hexadecane-co-trimethylolpropane trimethacrylate) monolithic column for capillary electrochromatography. Electrophoresis 2009; 30:3540-7. [DOI: 10.1002/elps.200900018] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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37
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Svec F. CEC: selected developments that caught my eye since the year 2000. Electrophoresis 2009; 30 Suppl 1:S68-82. [PMID: 19517503 DOI: 10.1002/elps.200900062] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
During the last decade, a number of new developments have emerged in the field of CEC. This paper focuses only on monolithic columns prepared from synthetic polymers. Monolithic columns have become a well-established format of stationary phases for CEC immediately after their inception in the mid-1990s. They are readily prepared in situ from liquid precursors. Also, the control over both porous properties and surface chemistries is easy to achieve. These advantages make the monolithic separation media an attractive alternative to capillary columns packed with particulate materials. Since the number of papers concerned with just this single topic of polymer-based monolithic CEC columns is large, this overview describes only those approaches this author found interesting.
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Affiliation(s)
- Frantisek Svec
- The Molecular Foundry, E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8197, USA.
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38
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Zhong H, El Rassi Z. Monolithic silica capillary columns having immobilized lectins and surface bound polar functionalities for lectin affinity and normal phase nano-LC and CEC of glycoconjugates, respectively. J Sep Sci 2009; 32:1642-53. [DOI: 10.1002/jssc.200900127] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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