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Screening of Antioxidant Compounds in Green Coffee by Low-Pressure Chromatography with Amperometric Detection. FOOD ANAL METHOD 2021. [DOI: 10.1007/s12161-021-02037-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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2
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Santos JR, Rangel AO. Development of a chromatographic low pressure flow injection system using amperometric detection: Application to the analysis of niacin in coffee. Food Chem 2015; 187:152-8. [DOI: 10.1016/j.foodchem.2015.04.093] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 04/20/2015] [Accepted: 04/22/2015] [Indexed: 10/23/2022]
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3
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Ma Y, Gao W, Yu H, Li M. RAPID METHOD FOR DETERMINATION OF HOMOLOGUE IMIDAZOLIUM IONIC LIQUID CATIONS BY ION-PAIR CHROMATOGRAPHY USING A MONOLITHIC COLUMN. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2012.734000] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Yajie Ma
- a College of Chemistry and Chemical Engineering, Harbin Normal University , Harbin , People's Republic of China
| | - Wei Gao
- a College of Chemistry and Chemical Engineering, Harbin Normal University , Harbin , People's Republic of China
| | - Hong Yu
- a College of Chemistry and Chemical Engineering, Harbin Normal University , Harbin , People's Republic of China
| | - Meng Li
- a College of Chemistry and Chemical Engineering, Harbin Normal University , Harbin , People's Republic of China
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Hartwell SK, Kehling A, Lapanantnoppakhun S, Grudpan K. Flow Injection/Sequential Injection Chromatography: A Review of Recent Developments in Low Pressure with High Performance Chemical Separation. ANAL LETT 2013. [DOI: 10.1080/00032719.2012.749487] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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5
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Mixed mode HILIC/anion exchange separations on latex coated silica monoliths. Talanta 2012; 100:313-9. [DOI: 10.1016/j.talanta.2012.07.069] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Revised: 07/26/2012] [Accepted: 07/26/2012] [Indexed: 11/18/2022]
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6
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Determination of nitrite, nitrate, bromide, and iodide in seawater by ion chromatography with UV detection using dilauryldimethylammonium-coated monolithic ODS columns and sodium chloride as an eluent. Anal Bioanal Chem 2012; 404:2513-7. [DOI: 10.1007/s00216-012-6405-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 08/28/2012] [Accepted: 09/03/2012] [Indexed: 11/24/2022]
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7
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Zhang Z, Li D, Liu X, Subhani Q, Zhu Y, Kang Q, Shen D. Determination of anions using monolithic capillary column ion chromatography with end-to-end differential contactless conductometric detectors under resonance approach. Analyst 2012; 137:2876-83. [PMID: 22576018 DOI: 10.1039/c2an35150a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An end-to-end differential measurement approach with capacitively coupled contactless conductivity detection (C(4)D) was applied to anion-exchange monolithic capillary column ion chromatography. The column was prepared by thermally initiated radical polymerization of poly(glycidyl methacrylate) in a fused-silica capillary of 320 μm i.d. and modified by quaternary ammonium latex surface coating. Two C(4)Ds were placed near both ends of the capillary column and the output difference between them was measured. With 15 mM potassium hydrogen phthalate used as the eluent, good separation of a mixture of inorganic anions (F(-), Cl(-), NO(2)(-), NO(3)(-)) was achieved. The detection limits of conventional C(4)D are 1.6, 0.28, 0.53, and 0.47 mg L(-1) for F(-), Cl(-), NO(2)(-), and NO(3)(-), respectively. To further enhance the sensitivity, the capacitive impedance from C(4)D was neutralized by an inductive impedance from a piezoelectric resonator. An increase in sensitivity by a factor of 7-8 was achieved in the resonating C(4)D in comparison with the conventional C(4)D. The detection limits of the resonating C(4)D are 0.23, 0.041, 0.065, and 0.059 mg L(-1) for F(-), Cl(-), NO(2)(-), and NO(3)(-), respectively. The response of the resonating C(4)D was analyzed based on an equivalent circuit model.
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Affiliation(s)
- Zhenli Zhang
- The Key Lab in Molecular and Nano-materials Probes of the Ministry of Education of China, College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, PR China
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Santos JR, Rangel AO. Development of a chromatographic low pressure flow injection system: Application to the analysis of methylxanthines in coffee. Anal Chim Acta 2012; 715:57-63. [DOI: 10.1016/j.aca.2011.12.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Revised: 11/28/2011] [Accepted: 12/01/2011] [Indexed: 12/28/2022]
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9
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Ballesta-Claver J, Valencia MC, Capitán-Vallvey LF. Analysis of phenolic compounds in health care products by low-pressure liquid-chromatography with monolithic column and chemiluminescent detection. LUMINESCENCE 2011; 26:44-53. [DOI: 10.1002/bio.1184] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Revised: 10/08/2009] [Accepted: 10/14/2009] [Indexed: 11/05/2022]
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10
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Chambers SD, Pohl CA, Lucy CA. Agglomerated carbon based phases for anion exchange chromatography. J Chromatogr A 2011; 1218:263-9. [DOI: 10.1016/j.chroma.2010.11.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Revised: 11/09/2010] [Accepted: 11/12/2010] [Indexed: 10/18/2022]
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11
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Nordborg A, Hilder EF, Haddad PR. Monolithic phases for ion chromatography. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2011; 4:197-226. [PMID: 21689046 DOI: 10.1146/annurev-anchem-061010-113929] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Monolithic media are continuing to increase in popularity in chromatographic applications, and the ongoing use of commercially available materials in ion chromatography (IC) has made monoliths a viable alternative to packed-bed columns for routine use. We discuss different strategies for the synthesis of polymeric and silica monoliths with ion-exchange functionality, such as direct incorporation of ion-exchange functionality during monolith preparation and different postpolymerization alterations such as grafting and coating. The formulations and strategies presented are focused on materials intended for use in IC. We also discuss strategies for materials characterization, with emphasis on nondestructive techniques for the characterization of monolith surface functionality, especially those with applicability to in situ analysis. Finally, we describe selected IC applications of polymeric and silica monoliths published from 2008 to 2010.
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Affiliation(s)
- Anna Nordborg
- Australian Center for Research on Separation Science, School of Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia.
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12
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Multisyringe ion chromatography with chemiluminescence detection for the determination of oxalate in beer and urine samples. Mikrochim Acta 2010. [DOI: 10.1007/s00604-010-0511-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Ibrahim MEA, Zhou T, Lucy CA. Agglomerated silica monolithic column for hydrophilic interaction LC. J Sep Sci 2010; 33:773-8. [PMID: 20222075 DOI: 10.1002/jssc.200900698] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Hydrophilic interaction LC (HILIC) has gained wide acceptance in recent years due to its ability to retain and separate polar compounds such as pharmaceuticals. Most commercial HILIC phases are particle based, which limit the speed with which HILIC separations can be performed. Herein, agglomerated silica monolithic columns are prepared by electrostatically attaching polyionic latex particles onto a silica monolith by simply flushing a suspension of the ionic latex through a silica monolith. Such phases retain the high efficiency and permeability of the native silica monolith, while the agglomerated phase is easy to introduce and provides excellent mass transfer. High %ACN in the mobile phase dramatically increases the efficiency and retention, consistent with HILIC behavior. Test analytes such as benzoates, nucleotides and amino acids are separated with plate heights of 25-110 microm. The high permeability of monoliths allows HILIC separations to be performed with baseline resolution in less than 15 s. Electrostatic repulsion-hydrophilic liquid interaction chromatographic retention behavior of the latex-coated monoliths is verified using amino acids as test analytes.
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García Jiménez JF, Carmen Valencia M, Capitán-Vallvey LF. Parabens determination with a hybrid FIA/HPLC system with ultra-short monolithic column. JOURNAL OF ANALYTICAL CHEMISTRY 2010. [DOI: 10.1134/s1061934810020152] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Gao W, Yu H, Zhou S. Determination of Imidazolium Ionic Liquid Cations by Ion-Pair Chromatography Using a Monolithic Column and Direct Conductivity Detection. Chromatographia 2010. [DOI: 10.1365/s10337-010-1478-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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16
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Yu H, Ai H, Chen Q. Rapid Analysis of Nitrate and Nitrite by Ion-Interaction Chromatography on a Monolithic Column. Chromatographia 2009. [DOI: 10.1365/s10337-009-1292-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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17
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Watanabe Y, Ikegami T, Horie K, Hara T, Jaafar J, Tanaka N. Improvement of separation efficiencies of anion-exchange chromatography using monolithic silica capillary columns modified with polyacrylates and polymethacrylates containing tertiary amino or quaternary ammonium groups. J Chromatogr A 2009; 1216:7394-401. [PMID: 19683243 DOI: 10.1016/j.chroma.2009.07.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Revised: 07/04/2009] [Accepted: 07/08/2009] [Indexed: 11/17/2022]
Abstract
Anion-exchange (AEX) columns were prepared by on-column polymerization of acrylates and methacrylates containing tertiary amino or quaternary ammonium groups on monolithic silica in a fused silica capillary modified with anchor groups. The columns provided a plate height (H) of less than 10 microm at optimum linear velocity (u) with keeping their high permeability (K=9-12 x 10(-14) m2). Among seven kinds of AEX columns, a monolithic silica column modified with poly(2-hydroxy-3-(4-methylpiperazin-1-yl)propyl methacrylates) (HMPMA) showed larger retentions and better selectivities for nucleotides and inorganic anions than the others. The HMPMA column of 410 mm length produced 42,000-55,000 theoretical plates (N) at a linear velocity of 0.97 mm/s with a backpressure of 3.8 MPa. The same column could be employed for a fast separation of inorganic anions in 1.8 min at a linear velocity of 5.3 mm/s with a backpressure of 20 MPa. In terms of van Deemter plot and separation impedance, the HMPMA column showed higher performance than a conventional particle-packed AEX column. The HMPMA column showed good recovery of a protein, trypsin inhibitor, and it was applied to the separation of proteins and tryptic digest of bovine serum albumin (BSA) in a gradient elution, to provide better separation compared to a conventional particle-packed AEX column.
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Affiliation(s)
- Yuta Watanabe
- Department of Biomolecular Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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García Jiménez JF, Valencia MC, Capitán-Vallvey LF. Intense Sweetener Mixture Resolution by Flow Injection Method with On-Line Monolithic Element. J LIQ CHROMATOGR R T 2009. [DOI: 10.1080/10826070902841885] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- J. F. García Jiménez
- a Faculty of Sciences, Solid Phase Spectrometry Research Group, Department of Analytical Chemistry , Campus Fuentenueva, University of Granada , Granada, Spain
| | - M. C. Valencia
- a Faculty of Sciences, Solid Phase Spectrometry Research Group, Department of Analytical Chemistry , Campus Fuentenueva, University of Granada , Granada, Spain
| | - L. F. Capitán-Vallvey
- a Faculty of Sciences, Solid Phase Spectrometry Research Group, Department of Analytical Chemistry , Campus Fuentenueva, University of Granada , Granada, Spain
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Jaafar J, Watanabe Y, Ikegami T, Miyamoto K, Tanaka N. Anion exchange silica monolith for capillary liquid chromatography. Anal Bioanal Chem 2008; 391:2551-6. [PMID: 18458888 DOI: 10.1007/s00216-008-2063-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2008] [Revised: 03/07/2008] [Accepted: 03/07/2008] [Indexed: 11/28/2022]
Abstract
An anion exchange monolithic silica capillary column was prepared by surface modification of a hybrid monolithic silica capillary column prepared from a mixture of tetramethoxysilane (TMOS) and methyltrimethoxysilane (MTMS). The surface modification was carried out by on-column copolymerization of N-[3-(dimethylamino)propyl]acrylamide methyl chloride-quaternary salt (DMAPAA-Q) with 3-methacryloxypropyl moieties bonded as an anchor to the silica surface to form a strong anion exchange stationary phase. The columns were examined for their performance in liquid chromatography (LC) and capillary electrochromatography (CEC) separations of common anions. The ions were separated using 50 mM phosphate buffer at pH 6.6. Evaluation by LC produced an average of 30,000 theoretical plates (33 cm column length) for the inorganic anions and nucleotides. Evaluation by CEC, using the same buffer, produced enhanced chromatographic performance of up to ca. 90,000 theoretical plates and a theoretical plate height of ca. 4 mum. Although reduced efficiency was observed for inorganic anions that were retained a long time, the results of this study highlight the potential utility of the DMAPAA-Q stationary phase for anion separations.
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Affiliation(s)
- Jafariah Jaafar
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM, Skudai, Malaysia.
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20
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Núñez O, Nakanishi K, Tanaka N. Preparation of monolithic silica columns for high-performance liquid chromatography. J Chromatogr A 2008; 1191:231-52. [DOI: 10.1016/j.chroma.2008.02.029] [Citation(s) in RCA: 174] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2007] [Revised: 02/07/2008] [Accepted: 02/08/2008] [Indexed: 10/22/2022]
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21
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Jungbauer A, Hahn R. Polymethacrylate monoliths for preparative and industrial separation of biomolecular assemblies. J Chromatogr A 2008; 1184:62-79. [DOI: 10.1016/j.chroma.2007.12.087] [Citation(s) in RCA: 182] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2007] [Revised: 12/04/2007] [Accepted: 12/19/2007] [Indexed: 11/28/2022]
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22
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Haddad PR, Nesterenko PN, Buchberger W. Recent developments and emerging directions in ion chromatography. J Chromatogr A 2008; 1184:456-73. [DOI: 10.1016/j.chroma.2007.10.022] [Citation(s) in RCA: 163] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2007] [Revised: 10/04/2007] [Accepted: 10/09/2007] [Indexed: 11/29/2022]
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23
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Glenn KM, Lucy CA. Stability of surfactant coated columns for ion chromatography. Analyst 2008; 133:1581-6. [DOI: 10.1039/b719919h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Chambers SD, Lucy CA. Surfactant coated graphitic carbon based stationary phases for anion-exchange chromatography. J Chromatogr A 2007; 1176:178-84. [DOI: 10.1016/j.chroma.2007.10.108] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2007] [Revised: 10/24/2007] [Accepted: 10/31/2007] [Indexed: 11/26/2022]
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25
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Chambers SD, Glenn KM, Lucy CA. Developments in ion chromatography using monolithic columns. J Sep Sci 2007; 30:1628-45. [PMID: 17623445 DOI: 10.1002/jssc.200700090] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The focus of this review is on current status and on-going developments in ion chromatography (IC) using monolithic phases. The use and potential of both silica and polymeric monoliths in IC is discussed, with silica monoliths achieving efficiencies upwards of 10(5) plates/m for inorganic ions in a few minutes or less. Ion exchange capacity can be introduced onto the monolithic columns through the addition of ion interaction reagents to the eluent, coating of the monolith with ionic surfactants or polyelectrolyte latexes, and covalent bonding. The majority of the studies to date have used surfactant-coated columns, but the stability of surfactant coatings limits this approach. Applications of monolithic IC columns to the separation of inorganic anions and cations are tabulated. Finally, a discussion on the recent commercialization of monolithic IC columns and the use of monolithic phases for IC peripherals such as preconcentrator columns, microextractors and suppressors is presented.
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Affiliation(s)
- Stuart D Chambers
- Department of Chemistry, University of Alberta, Gunning/Lemieux Chemistry Centre, Edmonton, Alberta, Canada
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26
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Glenn KM, Lucy CA, Haddad PR. Ion chromatography on a latex-coated silica monolith column. J Chromatogr A 2007; 1155:8-14. [PMID: 17306813 DOI: 10.1016/j.chroma.2007.01.098] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2006] [Revised: 01/24/2007] [Accepted: 01/26/2007] [Indexed: 11/15/2022]
Abstract
A silica monolith column (Merck Chromolith, 100 mm x 4.6 mm) has been coated with Dionex AS9-SC latex nanoparticles to convert the column into an anion-exchange stationary phase. For comparison purposes, a reversed-phase silica monolith was also converted into an anion-exchange column by coating with the cationic surfactant didodecyldimethylammonium bromide (DDAB). Separations of common inorganic anions were carried out using 7.5 or 5.0 mM 4-hydroxybenzoic acid at pH 7.0 along with suppressed conductivity detection. Direct comparisons were then made between the two columns in terms of selectivity, efficiency and stability. The latex-coated column was on average 50% more efficient than the DDAB-coated column. A 10% decrease in retention times was observed on the DDAB column over 11 h of continuous eluent flow, while the latex coating exhibited <1% change in retention even after 2.5 months of periodic use.
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Affiliation(s)
- Karen M Glenn
- Department of Chemistry, University of Alberta, Gunning/Lemieux Chemistry Centre, Edmonton, AB, Canada T6G 2G2
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García-Jiménez JF, Valencia MC, Capitán-Vallvey LF. Simultaneous determination of antioxidants, preservatives and sweetener additives in food and cosmetics by flow injection analysis coupled to a monolithic column. Anal Chim Acta 2007; 594:226-33. [PMID: 17586119 DOI: 10.1016/j.aca.2007.05.040] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2007] [Revised: 05/21/2007] [Accepted: 05/23/2007] [Indexed: 10/23/2022]
Abstract
Today it is common to find samples with various additives from several families. This is the case of sweeteners, preservatives and antioxidants. We have selected a set of additives broadly used in foods and cosmetics with an ample variety of polarities, namely: aspartame (AS), acesulfame (AK)/saccharin (SA), methylparaben (MP), ethylparaben (EP), propylparaben (PP), butylparaben (BP), propylgallate (PG) and butylhydroxyanisole (BA). The monolithic column used as separative system is a 5 mm commercial precolumn of silica C18 coupled to a flow injection manifold working with a peristaltic pump. The mixture was separated in only 400 s with resolution factors greater than 1.1 in all cases. To achieve the separation in the FIA system we used two carriers: first, a mixture of ACN/water buffered with 10 mM pH 6.0 phosphate buffer and second, a methanol:water mixture to improve the carrier strength and speed up the more apolar analytes at 3.5 mL min(-1). Detection is accomplished by means of a diode array spectrometer at the respective wavelength of each compound. The comparison of the analytical parameters obtained for this procedure with a standard HPLC method validates our new method, obtaining a method that is quick, with high repeatability and reproducibility and with good resolution between analytes. We have successfully applied the method to real food and cosmetics samples.
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Affiliation(s)
- J F García-Jiménez
- Department of Analytical Chemistry, Faculty of Sciences, Campus Fuentenueva, University of Granada, Granada 18071, Spain
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Suzuki A, Lim LW, Takeuchi T. Rapid Separation of Inorganic Anions by Capillary Ion Chromatography Using Monolithic Silica Columns Modified with Dilauryldimethylammonium Ion. ANAL SCI 2007; 23:1081-4. [PMID: 17878582 DOI: 10.2116/analsci.23.1081] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The rapid separation of inorganic anions was determined by capillary ion chromatography using monolithic silica capillary columns modified with dilauryldimethylammonium bromide. The stability of the modified stationary phase was satisfactory owing to a strong hydrophobic interaction between the lauryl groups of the reagent, even if the eluent did not contain dilauryldimethylammonium ion. Bromide in seawater samples could be determined by the present system. The repeatability of a retention time of bromide for six successive measurements was around 1.8% when a 500 mM sodium chloride aqueous solution was used as the eluent. Seawater samples were directly injected onto the prepared column without any interference of matrix ions, because an aqueous solution of high-concentration sodium chloride could be used as the eluent. Bromide in seawater samples could be determined within 2 min.
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Affiliation(s)
- Atsushi Suzuki
- Department of Chemistry, Faculty of Engineering, Gifu University, Gifu, Japan
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Barron L, Nesterenko PN, Diamond D, O'Toole M, Lau KT, Paull B. Low pressure ion chromatography with a low cost paired emitter–detector diode based detector for the determination of alkaline earth metals in water samples. Anal Chim Acta 2006; 577:32-7. [PMID: 17723650 DOI: 10.1016/j.aca.2006.05.101] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2006] [Revised: 05/24/2006] [Accepted: 05/25/2006] [Indexed: 11/16/2022]
Abstract
The use of a low pressure ion chromatograph based upon short (25 mm x 4.6 mm) surfactant coated monolithic columns and a low cost paired emitter-detector diode (PEDD) based detector, for the determination of alkaline earth metals in aqueous matrices is presented. The system was applied to the separation of magnesium, calcium, strontium and barium in less than 7min using a 0.15M KCl mobile phase at pH 3, with post-column reaction detection at 570 nm using o-cresolphthalein complexone. A comparison of the performance of the PEDD detector with a standard laboratory absorbance detector is shown, with limits of detection for magnesium and calcium using the low cost PEDD detector equal to 0.16 and 0.23 mg L(-1), respectively. Finally, the developed system was used for the determination of calcium and magnesium in a commercial spring water sample.
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Affiliation(s)
- Leon Barron
- National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland
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Pelletier S, Lucy CA. Fast and high-resolution ion chromatography at high pH on short columns packed with 1.8μm surfactant coated silica reverse-phase particles. J Chromatogr A 2006; 1125:189-94. [PMID: 16782112 DOI: 10.1016/j.chroma.2006.05.059] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2006] [Revised: 05/17/2006] [Accepted: 05/19/2006] [Indexed: 11/16/2022]
Abstract
Rapid ion chromatographic separations of small inorganic anions are performed on columns packed with high-pH resistant Zorbax Extend-C18 1.8 microm silica particles. Seven anions (iodate, chloride, nitrite, bromide, nitrate, phosphate, sulphate) are separated with 1.3 and 2 cm long x 0.46 cm I.D. C18 columns coated with the surfactant didodecyldimethylammonium bromide (DDAB). A 40 s separation is achieved at 2 mL/min with a 2.5 mM 4-hydroxybenzoic acid eluent at pH 10. Finally, the DDAB removal procedure is improved to eliminate the pressure build-up caused by precipitation of the surfactant in the column upon uncoating.
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Affiliation(s)
- Sarah Pelletier
- Department of Chemistry, Gunning/Lemieux Chemistry Centre, University of Alberta, Edmonton, Alta. T6G 2G2, Canada
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