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Zhu X, Liu S, Gao X, Gu Y, Yu Y, Li M, Chen X, Fan M, Jia Y, Tian L, Xiang M, Yu Y. Typical emerging contaminants in sewage treatment plant effluent, and related watersheds in the Pearl River Basin: Ecological risks and source identification. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:135046. [PMID: 38964038 DOI: 10.1016/j.jhazmat.2024.135046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Revised: 06/09/2024] [Accepted: 06/25/2024] [Indexed: 07/06/2024]
Abstract
Emerging contaminants pose a potential risk to aquatic ecosystems in the Pearl River Basin, China, owing to the high population density and active industry. This study investigated samples from eight sewage treatment plants, and five surface water bodies of related watersheds. To screen the risk of emerging contaminants (ECs), and clarify their sources, this study calculated the risk quotient of detected chemical and performed source identification/apportionment using the positive matrix factorization method. In total, 149 organic pollutants were identified. Pharmaceuticals showed significant concentrations in sewage treatment plant samples (120.87 ng/L), compared with surface water samples (1.13 ng/L). The ecological risk assessment identified three chemicals with a heightened risk to aquatic organisms: fipronil sulfide, caffeine, and roxithromycin. Four principal sources of contaminants were identified: pharmaceutical wastewater, domestic sewage, medical effluent, and agricultural runoff. Pharmaceutical wastewater was the primary contributor (60.4 %), to the cumulative EC concentration and to ECs in sewage treatment plant effluent. Agricultural drainage was the main source of ECs in surface water. This study provides a strategy to obtain comprehensive information on the aquatic risks and potential sources of EC species in areas affected by artificial activities, which is of substantial importance to pollutant management and control.
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Affiliation(s)
- Xiaohui Zhu
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Siyan Liu
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China
| | - Xiaofeng Gao
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China
| | - Yilu Gu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China.
| | - Ying Yu
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China
| | - Min Li
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China
| | - Xiaowen Chen
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China
| | - Mengqi Fan
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China
| | - Yujie Jia
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China
| | - Liping Tian
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China
| | - Mingdeng Xiang
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China
| | - Yunjiang Yu
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China.
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Bocian S, Dembek M, Kalisz O. Exploring the green frontier: Subcritical water chromatography for sustainable analytical practices. J Sep Sci 2024; 47:e2300873. [PMID: 38801758 DOI: 10.1002/jssc.202300873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 03/19/2024] [Accepted: 03/22/2024] [Indexed: 05/29/2024]
Abstract
Water in the subcritical state is characterized by properties significantly different from water under standard conditions. These include low viscosity, low surface tension, and a much lower dielectric constant, increasing the solubility of nonpolar substances. For this reason, it can provide an alternative solvent and be used in chromatographic techniques-subcritical water chromatography (SBWC). SBWC appears to be one of the greenest analytical techniques until we unravel chromatography with pure water at room temperature. The versatility of SBWC is explored through its applications in the separation and analysis of a wide range of compounds, including pharmaceuticals, natural products, etc. The use of subcritical water as a mobile phase requires suitable stable stationary phases and special apparatus. Still, it makes it possible to conduct analyses without using organic solvents. When using this technique, it is important to remember that it suits the analysis of thermally stable substances. The following work is a critical review of developments in SBWC.
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Affiliation(s)
- Szymon Bocian
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Torun, Poland
| | - Mikołaj Dembek
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Torun, Poland
| | - Oktawia Kalisz
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Torun, Poland
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Weise C, Westphal H, Warias R, Belder D. High-temperature ultrafast ChipHPLC-MS. Anal Bioanal Chem 2024; 416:1023-1031. [PMID: 38112789 PMCID: PMC10800301 DOI: 10.1007/s00216-023-05092-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 11/30/2023] [Accepted: 12/04/2023] [Indexed: 12/21/2023]
Abstract
Herein, we present a miniaturized chip-based HPLC approach coupled to electrospray ionization mass spectrometry utilizing temperature to achieve high-speed separations. The approach benefits from the low thermal mass of the microfluidic chip and can form an electrospray from the pre-heated mobile phase. With the help of this technology, isothermal and temperature-programmable operations up to 130°C were pursued to perform reversed-phase separations of pesticides in methanol and ethanol-containing eluents in less than 20 s.
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Affiliation(s)
- Chris Weise
- Institute of Analytical Chemistry, University Leipzig, Linnéstrasse 3, 04103, Leipzig, Germany
| | - Hannes Westphal
- Institute of Analytical Chemistry, University Leipzig, Linnéstrasse 3, 04103, Leipzig, Germany
| | - Rico Warias
- Institute of Analytical Chemistry, University Leipzig, Linnéstrasse 3, 04103, Leipzig, Germany
| | - Detlev Belder
- Institute of Analytical Chemistry, University Leipzig, Linnéstrasse 3, 04103, Leipzig, Germany.
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Lenčo J, Jadeja S, Naplekov DK, Krokhin OV, Khalikova MA, Chocholouš P, Urban J, Broeckhoven K, Nováková L, Švec F. Reversed-Phase Liquid Chromatography of Peptides for Bottom-Up Proteomics: A Tutorial. J Proteome Res 2022; 21:2846-2892. [PMID: 36355445 DOI: 10.1021/acs.jproteome.2c00407] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The performance of the current bottom-up liquid chromatography hyphenated with mass spectrometry (LC-MS) analyses has undoubtedly been fueled by spectacular progress in mass spectrometry. It is thus not surprising that the MS instrument attracts the most attention during LC-MS method development, whereas optimizing conditions for peptide separation using reversed-phase liquid chromatography (RPLC) remains somewhat in its shadow. Consequently, the wisdom of the fundaments of chromatography is slowly vanishing from some laboratories. However, the full potential of advanced MS instruments cannot be achieved without highly efficient RPLC. This is impossible to attain without understanding fundamental processes in the chromatographic system and the properties of peptides important for their chromatographic behavior. We wrote this tutorial intending to give practitioners an overview of critical aspects of peptide separation using RPLC to facilitate setting the LC parameters so that they can leverage the full capabilities of their MS instruments. After briefly introducing the gradient separation of peptides, we discuss their properties that affect the quality of LC-MS chromatograms the most. Next, we address the in-column and extra-column broadening. The last section is devoted to key parameters of LC-MS methods. We also extracted trends in practice from recent bottom-up proteomics studies and correlated them with the current knowledge on peptide RPLC separation.
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Affiliation(s)
- Juraj Lenčo
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Siddharth Jadeja
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Denis K Naplekov
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Oleg V Krokhin
- Department of Internal Medicine, Manitoba Centre for Proteomics and Systems Biology, University of Manitoba, 799 JBRC, 715 McDermot Avenue, WinnipegR3E 3P4, Manitoba, Canada
| | - Maria A Khalikova
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Petr Chocholouš
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Jiří Urban
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00Brno, Czech Republic
| | - Ken Broeckhoven
- Department of Chemical Engineering (CHIS), Faculty of Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050Brussel, Belgium
| | - Lucie Nováková
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - František Švec
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
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Han Jeong Y, Van Kien N, Jin Han Seog D, Ryoo JJ. Comparison between the use of polyether ether ketone and stainless steel columns for ultrasonic-assisted extraction under various ultrasonic conditions. ULTRASONICS SONOCHEMISTRY 2022; 90:106125. [PMID: 36191369 PMCID: PMC9531288 DOI: 10.1016/j.ultsonch.2022.106125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 08/03/2022] [Accepted: 08/13/2022] [Indexed: 06/16/2023]
Abstract
The ultrasound-assisted extraction (UAE) was conducted using the stainless steel (SS) and polyether ether ketone (PEEK) columns and analyzed with high-performance liquid chromatography (HPLC) to understand the mechanism of ultrasound-assisted chromatography (UAC). Empty SS and PEEK columns were used to extract dyes from a fabric under identical conditions with several parameters including the initial ultrasonic bath temperatures (30 °C and 40 °C), ultrasound power intensities (0, 20, 40, 60, 80, and 100 %), ultrasound operation modes (normal and sweep), and ultrasound frequencies (25 kHz, 40 kHz, and 132 kHz) to compare their extraction capabilities. After 30 min of extraction, the amount of extract was determined by HPLC. The PEEK material was significantly affected by ultrasonic radiation compared to the SS material, especially at a higher temperature (40 °C), power intensity (100 %), and frequency (132 kHz) with sweep mode. At a maximum power density of 45 W/L, the extraction effectiveness ratio of PEEK to SS was in the range of 1.8 - 3.9 depending on the specific frequency, initial temperature, and with or without temperature control. The most optimal ultrasound frequencies, in terms of enhancing extraction effectiveness, are in the order of 132 kHz, 40 kHz, and 25 kHz. Unlike the SS material, the PEEK material was more affected by temperature and acoustic effects under identical conditions, especially at 132 kHz ultrasound frequency. In contrast, at lower frequencies of 40 kHz and 25 kHz, no significant differences in the acoustic effects were observed between the PEEK and SS materials. The findings of this study contribute to elucidating the roles of column materials in UAE and UAC.
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Affiliation(s)
- Young Han Jeong
- Department of Chemistry, Kyungpook National University, Daegu 702-701, South Korea
| | - Nguyen Van Kien
- Department of Chemistry Education, Kyungpook National University, Daegu 702-701, South Korea
| | - David Jin Han Seog
- Science Education Research Institute, Kyungpook National University, Daegu 702-701, South Korea
| | - Jae Jeong Ryoo
- Department of Chemistry Education, Kyungpook National University, Daegu 702-701, South Korea; Science Education Research Institute, Kyungpook National University, Daegu 702-701, South Korea.
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Stationary Phases for Green Liquid Chromatography. MATERIALS 2022; 15:ma15020419. [PMID: 35057141 PMCID: PMC8778826 DOI: 10.3390/ma15020419] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/14/2021] [Accepted: 12/30/2021] [Indexed: 01/27/2023]
Abstract
Industrial research, including pharmaceutical research, is increasingly using liquid chromatography techniques. This involves the production of large quantities of hazardous and toxic organic waste. Therefore, it is essential at this point to focus interest on solutions proposed by so-called “green chemistry”. One such solution is the search for new methods or the use of new materials that will reduce waste. One of the most promising ideas is to perform chromatographic separation using pure water, without organic solvents, as a mobile phase. Such an approach requires novel stationary phases or specific chromatographic conditions, such as an elevated separation temperature. The following review paper aims to gather information on stationary phases used for separation under purely aqueous conditions at various temperatures.
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Schieppati D, Patience NA, Campisi S, Patience GS. Experimental methods in chemical engineering: High performance liquid chromatography—HPLC. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Dalma Schieppati
- Chemical Engineering, Polytechnique Montréal Montréal Québec Canada
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Vrkoslav V, Rumlová B, Strmeň T, Cvačka J. Temperature-programmed capillary high-performance liquid chromatography with atmospheric pressure chemical ionization mass spectrometry for analysis of fatty acid methyl esters. J Sep Sci 2020; 43:2579-2588. [PMID: 32277790 DOI: 10.1002/jssc.201901235] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 04/07/2020] [Accepted: 04/07/2020] [Indexed: 11/10/2022]
Abstract
A new capillary high-performance liquid chromatography method with atmospheric pressure chemical ionization mass spectrometry was developed for the analysis of fatty acid methyl esters and long-chain alcohols. The chromatographic separation was achieved using a Zorbax SB-C18 HPLC column (0.3 × 150 mm, 3.5 μm) with a mobile phase composed of acetonitrile and formic acid and delivered isocratically at a flow rate of 10 μL/min. The column temperature was programmed simply, using a common column oven. Good reproducibility of the temperature profile and retention times were achieved. The temperature programming during the isocratic high-performance liquid chromatography run had a similar effect as a solvent gradient; it reduced retention times of later eluting analytes and improved their detection limits. Two atmospheric pressure chemical ionization sources of the mass spectrometry detector were compared: an enclosed conventional ion source and an in-house made ion source with a glass microchip nebulizer. The enclosed source provided better detectability of saturated fatty acid methyl esters and made it possible to determine the double bond positions using acetonitrile-related adducts, while the open chip-based source provided better analytical figures of merit for unsaturated fatty acid methyl esters. Temperature-programmed capillary high-performance liquid chromatography is a promising method for analyzing neutral lipids in lipidomics and other applications.
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Affiliation(s)
- Vladimír Vrkoslav
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague 6, Czech Republic
| | - Barbora Rumlová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague 6, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
| | - Timotej Strmeň
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague 6, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague 6, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
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10
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Brhane KW, Qamar S. Two-dimensional general rate model for non-isothermal liquid chromatography considering finite rates of adsorption–desorption kinetics. J LIQ CHROMATOGR R T 2020. [DOI: 10.1080/10826076.2020.1713803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Kewani Welay Brhane
- Department of Mathematics, COMSATS University Islamabad, Islamabad, Pakistan
- Department of Mathematics, Mekelle University, Mekelle, Ethiopia
| | - Shamsul Qamar
- Department of Mathematics, COMSATS University Islamabad, Islamabad, Pakistan
- Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
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Chen LC. High-Temperature Liquid Chromatography and the Hyphenation with Mass Spectrometry Using High-Pressure Electrospray Ionization. ACTA ACUST UNITED AC 2019; 8:S0079. [PMID: 32010544 PMCID: PMC6920344 DOI: 10.5702/massspectrometry.s0079] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 06/18/2019] [Indexed: 11/23/2022]
Abstract
Increasing the operating temperature of the liquid chromatography (LC) column has the same effect as reducing the diameter of the packing particles on minimizing the contribution of C-term in the van Deemter equation, flattening the curve of plate height vs. linear velocity in the high-speed region, thus allowing a fast LC analysis without the loss of plate count. While the use of smaller particles requires a higher pumping pressure, operating the column at higher temperature reduces the pressure due to lower liquid viscosity. At present, the adoption of high-temperature LC lags behind the ultra-high-pressure LC. Nevertheless, the availability of thermally stable columns has steadily improved and new innovations in this area have continued to emerge. This paper gives a brief review and updates on the recent advances in high-temperature liquid chromatography (HTLC). Recent efforts of hyphenating the capillary HTLC with mass spectrometry via a super-atmospheric pressure electrospray ionization is also reported.
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Affiliation(s)
- Lee Chuin Chen
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
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12
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Lee JH, Ryoo JJ. Ultrasound‐Controlled Chiral Separation of Four Amino Acids and 2,2,2‐Trifluoro‐1‐(9‐anthryl)ethanol. B KOREAN CHEM SOC 2019. [DOI: 10.1002/bkcs.11659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jae Hwan Lee
- Department of Chemistry EducationKyungpook National University Daegu South Korea, 702‐701
| | - Jae Jeong Ryoo
- Department of Chemistry EducationKyungpook National University Daegu South Korea, 702‐701
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Chen LC, Naito T, Ninomiya S, Hiraoka K. Hyphenation of high-temperature liquid chromatography with high-pressure electrospray ionization for subcritical water LC-ESI-MS. Analyst 2018; 143:5552-5558. [PMID: 30303205 DOI: 10.1039/c8an01113c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
High-pressure electrospray ionization (HP-ESI) performed under super-atmospheric pressure allows a stable and efficient electrospray of pure aqueous and/or superheated solutions even under a μL min-1 flow rate regime. In this paper, we report the direct coupling of the HP-ESI source to high-temperature liquid chromatography (HT-LC) operated at ≤30 μL min-1 flow rates. In addition to ESI, the ion source functions as a back-pressure regulator to keep the mobile phase in the liquid phase when the column is heated to >100 °C. Under an ion source pressure of 7 bar, the LC column can be operated up to 160 °C. LC is performed under isocratic elution, and besides the isothermal mode, the temperature of the column can also be programmed to increase the selectivity while keeping the ion source at a constant temperature. For a given solution flow rate, the analytical time can be shortened by increasing the column temperature. HT-LC-ESI-MS using pure water as the mobile phase with a capillary column is also demonstrated.
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Affiliation(s)
- Lee Chuin Chen
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11, Takeda, Kofu, Yamanashi 400-8511, Japan.
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Borisova DR, Statkus MA, Tsizin GI, Zolotov YA. Subcritical water: Use in chemical analysis. JOURNAL OF ANALYTICAL CHEMISTRY 2017. [DOI: 10.1134/s1061934817080044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Groskreutz SR, Weber SG. Temperature-assisted solute focusing with sequential trap/release zones in isocratic and gradient capillary liquid chromatography: Simulation and experiment. J Chromatogr A 2016; 1474:95-108. [PMID: 27836226 PMCID: PMC5115952 DOI: 10.1016/j.chroma.2016.10.062] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 10/19/2016] [Accepted: 10/24/2016] [Indexed: 12/24/2022]
Abstract
In this work we characterize the development of a method to enhance temperature-assisted on-column solute focusing (TASF) called two-stage TASF. A new instrument was built to implement two-stage TASF consisting of a linear array of three independent, electronically controlled Peltier devices (thermoelectric coolers, TECs). Samples are loaded onto the chromatographic column with the first two TECs, TEC A and TEC B, cold. In the two-stage TASF approach TECs A and B are cooled during injection. TEC A is heated following sample loading. At some time following TEC A's temperature rise, TEC B's temperature is increased from the focusing temperature to a temperature matching that of TEC A. Injection bands are focused twice on-column, first on the initial TEC, e.g. single-stage TASF, then refocused on the second, cold TEC. Our goal is to understand the two-stage TASF approach in detail. We have developed a simple yet powerful digital simulation procedure to model the effect of changing temperature in the two focusing zones on retention, band shape and band spreading. The simulation can predict experimental chromatograms resulting from spatial and temporal temperature programs in combination with isocratic and solvent gradient elution. To assess the two-stage TASF method and the accuracy of the simulation well characterized solutes are needed. Thus, retention factors were measured at six temperatures (25-75°C) at each of twelve mobile phases compositions (0.05-0.60 acetonitrile/water) for homologs of n-alkyl hydroxylbenzoate esters and n-alkyl p-hydroxyphenones. Simulations accurately reflect experimental results in showing that the two-stage approach improves separation quality. For example, two-stage TASF increased sensitivity for a low retention solute by a factor of 2.2 relative to single-stage TASF and 8.8 relative to isothermal conditions using isocratic elution. Gradient elution results for two-stage TASF were more encouraging. Application of two-stage TASF increased peak height for the least retained solute in the test mixture by a factor of 3.2 relative to single-stage TASF and 22.3 compared to isothermal conditions for an injection four-times the column volume. TASF improved resolution and increased peak capacity; for a 12-min separation peak capacity increased from 75 under isothermal conditions to 146 using single-stage TASF, and 185 for two-stage TASF.
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Affiliation(s)
- Stephen R Groskreutz
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, United States
| | - Stephen G Weber
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, United States.
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Wilson RE, Groskreutz SR, Weber SG. Improving the Sensitivity, Resolution, and Peak Capacity of Gradient Elution in Capillary Liquid Chromatography with Large-Volume Injections by Using Temperature-Assisted On-Column Solute Focusing. Anal Chem 2016; 88:5112-21. [PMID: 27033165 PMCID: PMC4940048 DOI: 10.1021/acs.analchem.5b04793] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Capillary HPLC (cLC) with gradient elution is the separation method of choice for the fields of proteomics and metabolomics. This is due to the complementary nature of cLC flow rates and electrospray or nanospray ionization mass spectrometry (ESI-MS). The small column diameters result in good mass sensitivity. Good concentration sensitivity is also possible by injection of relatively large volumes of solution and relying on solvent-based solute focusing. However, if the injection volume is too large or solutes are poorly retained during injection, volume overload occurs which leads to altered peak shapes, decreased sensitivity, and lower peak capacity. Solutes that elute early even with the use of a solvent gradient are especially vulnerable to this problem. In this paper, we describe a simple, automated instrumental method, temperature-assisted on-column solute focusing (TASF), that is capable of focusing large volume injections of small molecules and peptides under gradient conditions. By injecting a large sample volume while cooling a short segment of the column inlet at subambient temperatures, solutes are concentrated into narrow bands at the head of the column. Rapidly raising the temperature of this segment of the column leads to separations with less peak broadening in comparison to solvent focusing alone. For large volume injections of both mixtures of small molecules and a bovine serum albumin tryptic digest, TASF improved the peak shape and resolution in chromatograms. TASF showed the most dramatic improvements with shallow gradients, which is particularly useful for biological applications. Results demonstrate the ability of TASF with gradient elution to improve the sensitivity, resolution, and peak capacity of volume overloaded samples beyond gradient compression alone. Additionally, we have developed and validated a double extrapolation method for predicting retention factors at extremes of temperature and mobile phase composition. Using this method, the effects of TASF can be predicted, allowing determination of the usefulness of this technique for a particular application.
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Affiliation(s)
- Rachael E. Wilson
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Stephen R. Groskreutz
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Stephen G. Weber
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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Comparative studies of peak intensities and chromatographic separation of proteolytic digests, PTMs, and intact proteins obtained by nanoLC-ESI MS analysis at room and elevated temperatures. Anal Bioanal Chem 2016; 408:3953-68. [DOI: 10.1007/s00216-016-9386-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 01/26/2016] [Accepted: 02/01/2016] [Indexed: 12/26/2022]
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18
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De Pauw R, Pursch M, Desmet G. Using the column wall itself as resistive heater for fast temperature gradients in liquid chromatography. J Chromatogr A 2015; 1420:129-34. [PMID: 26476853 DOI: 10.1016/j.chroma.2015.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 10/01/2015] [Accepted: 10/04/2015] [Indexed: 11/28/2022]
Abstract
A new system is proposed for applying fast temperature gradients in liquid chromatography. It consists of a 0.7 mm × 150 mm fused-silica column coated with a 50 μm Nickel-layer, which is connecting with a power source and a temperature control system to perform fast and reproducible temperature gradients using the column wall itself as a resistive heater. Applying a current of 4A and passive cooling results in a maximal heating and cooling rate of, respectively, 71 and -21 °C/min. Multi-segment temperature gradients were superimposed on mobile phase gradients to enhance the selectivity for three sets of mixtures (pharmaceutical compounds, a highly complex mixture and an insecticide sample). This resulted in a higher peak count or better selectivities for the various mixtures.
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Affiliation(s)
- Ruben De Pauw
- Vrije Universiteit Brussel, Department of Chemical Engineering (CHIS-IR), Pleinlaan 2, 1050 Brussels, Belgium
| | - Matthias Pursch
- Dow Stade Produktions GmbH, Analytical Technology Center, 21677 Stade, Germany
| | - Gert Desmet
- Vrije Universiteit Brussel, Department of Chemical Engineering (CHIS-IR), Pleinlaan 2, 1050 Brussels, Belgium.
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19
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Nazario CED, Silva MR, Franco MS, Lanças FM. Evolution in miniaturized column liquid chromatography instrumentation and applications: An overview. J Chromatogr A 2015; 1421:18-37. [PMID: 26381569 DOI: 10.1016/j.chroma.2015.08.051] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 08/24/2015] [Accepted: 08/25/2015] [Indexed: 02/01/2023]
Abstract
The purpose of this article is to underline the miniaturized LC instrumental system and describe the evolution of commercially available systems by discussing their advantages and drawbacks. Nowadays, there are already many miniaturized LC systems available with a great variety of pump design, interface and detectors as well as efficient columns technologies and reduced connections devices. The solvent delivery systems are able to drive the mobile phase without flow splitters and promote gradient elution using either dual piston reciprocating or syringe-type pumps. The mass spectrometry as detection system is the most widely used detection system; among many alternative ionization sources direct-EI LC-MS is a promising alternative to APCI. In addition, capillary columns are now available showing many possibilities of stationary phases, inner diameters and hardware materials. This review provides a discussion about miniaturized LC demonstrating fundamentals and instrumentals' aspects of the commercially available miniaturized LC instrumental system mainly nano and micro LC formats. This review also covers the recent developments and trends in instrumentation, capillary and nano columns, and several applications of this very important and promising field.
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Affiliation(s)
| | - Meire R Silva
- Institute of Chemistry of Sao Carlos, University of Sao Paulo, Sao Carlos, SP, Brazil
| | - Maraíssa S Franco
- Institute of Chemistry of Sao Carlos, University of Sao Paulo, Sao Carlos, SP, Brazil
| | - Fernando M Lanças
- Institute of Chemistry of Sao Carlos, University of Sao Paulo, Sao Carlos, SP, Brazil.
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20
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Gagliardi LG, Tascon M, Castells CB. Effect of temperature on acid–base equilibria in separation techniques. A review. Anal Chim Acta 2015; 889:35-57. [DOI: 10.1016/j.aca.2015.05.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 05/16/2015] [Accepted: 05/22/2015] [Indexed: 10/23/2022]
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21
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Geng X, Jia X, Liu P, Wang F, Yang X. Two variables dominating the retention of intact proteins under gradient elution with simultaneous ultrafast high-resolution separation by hydrophobic interaction chromatography. Analyst 2015; 140:6692-704. [DOI: 10.1039/c5an01400j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The retention of proteins under gradient elution in HIC is dominated by two variables of steady and migration regions.
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Affiliation(s)
- Xindu Geng
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Institute of Modern Separation Science
- Shaanxi Provincial Key Laboratory
- Northwest University
- Xi'an
| | - Xiaodan Jia
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Institute of Modern Separation Science
- Shaanxi Provincial Key Laboratory
- Northwest University
- Xi'an
| | - Peng Liu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Institute of Modern Separation Science
- Shaanxi Provincial Key Laboratory
- Northwest University
- Xi'an
| | - Fei Wang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Institute of Modern Separation Science
- Shaanxi Provincial Key Laboratory
- Northwest University
- Xi'an
| | - Xiaoming Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Institute of Modern Separation Science
- Shaanxi Provincial Key Laboratory
- Northwest University
- Xi'an
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22
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Marins Coutinho LF, Domingues Nazario CE, Monteiro AM, Lanças FM. Novel devices for solvent delivery and temperature programming designed for capillary liquid chromatography. J Sep Sci 2014; 37:1903-10. [DOI: 10.1002/jssc.201301324] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Revised: 04/08/2014] [Accepted: 05/01/2014] [Indexed: 11/07/2022]
Affiliation(s)
| | | | | | - Fernando Mauro Lanças
- Institute of Chemistry of Sao Carlos; University of Sao Paulo; Sao Carlos (SP) Brazil
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23
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Yang Y, Rodriguez-Lafuente A, Pawliszyn J. Thermoelectric-based temperature-controlling system for in-tube solid-phase microextraction. J Sep Sci 2014; 37:1617-21. [DOI: 10.1002/jssc.201400041] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/03/2014] [Accepted: 04/04/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Yang Yang
- Department of Chemistry; University of Waterloo; Waterloo Ontario Canada
| | | | - Janusz Pawliszyn
- Department of Chemistry; University of Waterloo; Waterloo Ontario Canada
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24
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Aral H, Aral T, Ziyadanoğulları B, Ziyadanoğulları R. Development of a novel amide-silica stationary phase for the reversed-phase HPLC separation of different classes of phytohormones. Talanta 2013; 116:155-63. [DOI: 10.1016/j.talanta.2013.05.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 05/01/2013] [Accepted: 05/04/2013] [Indexed: 10/26/2022]
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25
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Loeser E, Babiak S. UNUSUAL CASE OF DIRECT RELATIONSHIP BETWEEN TEMPERATURE AND RETENTION IN REVERSED-PHASE LIQUID CHROMATOGRAPHY. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2012.704615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Eric Loeser
- a Novartis Pharmaceuticals , Suffern , New York , USA
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26
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Affiliation(s)
- Gert Desmet
- Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels,
Belgium
| | - Sebastiaan Eeltink
- Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels,
Belgium
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27
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Wang F, Min Y, Geng X. Fast separations of intact proteins by liquid chromatography. J Sep Sci 2012; 35:3033-45. [DOI: 10.1002/jssc.201200339] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2012] [Revised: 07/02/2012] [Accepted: 07/03/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Fei Wang
- Provincial Key Laboratory of Modern Separation Science of Shaanxi; Institute of Modern Separation Science; Northwest University; Xi'an P. R. China
| | - Yi Min
- Provincial Key Laboratory of Modern Separation Science of Shaanxi; Institute of Modern Separation Science; Northwest University; Xi'an P. R. China
| | - Xindu Geng
- Provincial Key Laboratory of Modern Separation Science of Shaanxi; Institute of Modern Separation Science; Northwest University; Xi'an P. R. China
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28
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Česlová L, Jandera P, Česla P. A study of the thermodynamics of retention of block (co)oligomers using high-performance liquid chromatography/mass spectrometry. J Chromatogr A 2012; 1247:89-98. [DOI: 10.1016/j.chroma.2012.05.076] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 05/22/2012] [Accepted: 05/22/2012] [Indexed: 10/28/2022]
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29
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Causon TJ, Cortes HJ, Shellie RA, Hilder EF. Temperature Pulsing for Controlling Chromatographic Resolution in Capillary Liquid Chromatography. Anal Chem 2012; 84:3362-8. [DOI: 10.1021/ac300161b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tim J. Causon
- Australian
Centre for Research
on Separation Science, School of Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania, Australia,
7001
| | - Hernan J. Cortes
- Australian
Centre for Research
on Separation Science, School of Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania, Australia,
7001
- HJ Cortes Consulting LLC, Midland, Michigan 48642, United States
| | - Robert A. Shellie
- Australian
Centre for Research
on Separation Science, School of Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania, Australia,
7001
| | - Emily F. Hilder
- Australian
Centre for Research
on Separation Science, School of Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania, Australia,
7001
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30
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Nakane K, Shirai S, Saito Y, Moriwake Y, Ueta I, Inoue M, Jinno K. High-temperature separations on a polymer-coated fibrous stationary phase in microcolumn liquid chromatography. ANAL SCI 2012; 27:811-6. [PMID: 21828918 DOI: 10.2116/analsci.27.811] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Novel polymer-coated fiber-packed microcolumns in liquid chromatography (LC) have been developed. Typical polymeric materials, such as polydimethylsiloxane and polyethyleneglycol, which are conventional stationary phases of capillary columns in gas chromatography (GC), have been employed as coating materials onto the surface of fine filaments. Packed longitudinally with a bundle of polymer-coated filaments into a stainless-steel capillary of 0.8 mm i.d., 150 mm length, several types of polymer-coated fiber-packed columns were prepared, and the retention behavior of aromatic compounds on these columns has been studied. A good linear relationship was obtained for van't Hoff plots over the temperature range between 0 and 200 °C, clearly indicating an excellent heat-resistant property of these polymer-coated fibrous stationary phases. Taking advantage of the heat-resistant feature of the fibrous stationary phases, the separation of several test mixtures with temperature-programmed elution was studied, where a solvent gradient program was additionally introduced if needed. Separation was also carried out with pure water as the mobile phase using an appropriate temperature program.
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Affiliation(s)
- Kenichi Nakane
- Department of Environmental and Life Sciences, Toyohashi University of Technology, Toyohashi 441-8580, Japan
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31
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Eghbali H, Sandra K, Tienpont B, Eeltink S, Sandra P, Desmet G. Exploring the Possibilities of Cryogenic Cooling in Liquid Chromatography for Biological Applications: A Proof of Principle. Anal Chem 2012; 84:2031-7. [DOI: 10.1021/ac203252u] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hamed Eghbali
- Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels,
Belgium
| | - Koen Sandra
- Research Institute for Chromatography, Kennedypark 26, B-8500 Kortrijk,
Belgium
| | - Bart Tienpont
- Research Institute for Chromatography, Kennedypark 26, B-8500 Kortrijk,
Belgium
| | - Sebastiaan Eeltink
- Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels,
Belgium
| | - Pat Sandra
- Research Institute for Chromatography, Kennedypark 26, B-8500 Kortrijk,
Belgium
| | - Gert Desmet
- Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels,
Belgium
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32
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The retention behaviour of polar compounds on zirconia based stationary phases under hydrophilic interaction liquid chromatography conditions. J Chromatogr A 2011; 1218:6981-6. [DOI: 10.1016/j.chroma.2011.07.100] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Revised: 07/19/2011] [Accepted: 07/26/2011] [Indexed: 11/24/2022]
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33
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Terol A, Paredes E, Maestre SE, Prats S, Todolí JL. Alcohol and metal determination in alcoholic beverages through high-temperature liquid-chromatography coupled to an inductively coupled plasma atomic emission spectrometer. J Chromatogr A 2011; 1218:3439-46. [DOI: 10.1016/j.chroma.2011.03.060] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 03/24/2011] [Accepted: 03/25/2011] [Indexed: 11/29/2022]
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34
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Collins D, Nesterenko E, Connolly D, Vasquez M, Macka M, Brabazon D, Paull B. Versatile Capillary Column Temperature Control Using a Thermoelectric Array Based Platform. Anal Chem 2011; 83:4307-13. [DOI: 10.1021/ac2004955] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David Collins
- Irish Separation Science Cluster (ISSC), National Centre for Sensor Research, Dublin, City University, Glasnevin, Dublin 9, Ireland
| | - Ekaterina Nesterenko
- Irish Separation Science Cluster (ISSC), National Centre for Sensor Research, Dublin, City University, Glasnevin, Dublin 9, Ireland
| | - Damian Connolly
- Irish Separation Science Cluster (ISSC), National Centre for Sensor Research, Dublin, City University, Glasnevin, Dublin 9, Ireland
- School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - Mercedes Vasquez
- Irish Separation Science Cluster (ISSC), National Centre for Sensor Research, Dublin, City University, Glasnevin, Dublin 9, Ireland
| | - Mirek Macka
- Australian Centre for Research on Separation Science (ACROSS), University of Tasmania, Hobart, Australia
| | - Dermot Brabazon
- Irish Separation Science Cluster (ISSC), Faculty of Engineering & Computing, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - Brett Paull
- Irish Separation Science Cluster (ISSC), National Centre for Sensor Research, Dublin, City University, Glasnevin, Dublin 9, Ireland
- Australian Centre for Research on Separation Science (ACROSS), University of Tasmania, Hobart, Australia
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35
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Verstraeten M, Pursch M, Eckerle P, Luong J, Desmet G. Modelling the thermal behaviour of the Low-Thermal Mass Liquid Chromatography system. J Chromatogr A 2011; 1218:2252-63. [DOI: 10.1016/j.chroma.2011.02.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 02/03/2011] [Accepted: 02/09/2011] [Indexed: 10/18/2022]
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36
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HILIC Retention Behavior and Method Development for Highly Polar Basic Compounds Used in Pharmaceutical Synthesis. ACTA ACUST UNITED AC 2011. [DOI: 10.1201/b10609-16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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37
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Verstraeten M, Broeckhoven K, Dittmann M, Choikhet K, Witt K, Desmet G. Kinetic performance limits of constant pressure versus constant flow rate gradient elution separations. Part II: Experimental. J Chromatogr A 2011; 1218:1170-84. [DOI: 10.1016/j.chroma.2010.12.087] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 12/16/2010] [Accepted: 12/19/2010] [Indexed: 10/18/2022]
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38
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Computer-assisted modelling and optimisation of reversed-phase high-temperature liquid chromatographic (RP-HTLC) separations. Anal Bioanal Chem 2010; 399:1951-64. [DOI: 10.1007/s00216-010-4078-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Revised: 07/20/2010] [Accepted: 07/30/2010] [Indexed: 11/26/2022]
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39
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Boronic acid lectin affinity chromatography (BLAC). 3. Temperature dependence of glycoprotein isolation and enrichment. Anal Bioanal Chem 2010; 397:2401-7. [DOI: 10.1007/s00216-010-3809-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 04/23/2010] [Accepted: 04/29/2010] [Indexed: 11/26/2022]
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40
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High temperature liquid chromatography of intact proteins using organic polymer monoliths and alternative solvent systems. J Chromatogr A 2010; 1217:3519-24. [DOI: 10.1016/j.chroma.2010.03.033] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Revised: 01/21/2010] [Accepted: 03/19/2010] [Indexed: 11/21/2022]
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41
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Pappa-Louisi A, Agrafiotou P, Thomas D, Papachristos K. Combined Effect of Temperature and Ternary Mobile Phase Composition on the Retention in Ternary Isocratic and Gradient Elution RP-LC under Isothermal Conditions. Application to the Retention Prediction of Four Macrolide Antibiotics. Chromatographia 2010. [DOI: 10.1365/s10337-010-1512-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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42
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Characterization of adsorption processes in analytical liquid–solid chromatography. J Chromatogr A 2010; 1217:792-812. [DOI: 10.1016/j.chroma.2009.12.044] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Revised: 12/15/2009] [Accepted: 12/17/2009] [Indexed: 11/22/2022]
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43
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Teutenberg T. Potential of high temperature liquid chromatography for the improvement of separation efficiency—A review. Anal Chim Acta 2009; 643:1-12. [DOI: 10.1016/j.aca.2009.04.008] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Revised: 04/01/2009] [Accepted: 04/03/2009] [Indexed: 10/20/2022]
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44
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Shillingford S, Bishop L, Smith CJ, Payne R, Wilson ID, Edge AM. Application of High Temperature LC to the Separation of AZD5438 (4-(1-Isopropyl-2-methyl-1H-imidazol-5-yl)-N-[4-(methylsulfonyl)phenyl]pyrimidin-2-amine) and Its Metabolites: Comparison of LC, UPLC and HTLC. Chromatographia 2009. [DOI: 10.1365/s10337-009-1135-7] [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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45
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Practical assessment of frictional heating effects and thermostat design on the performance of conventional (3μm and 5μm) columns in reversed-phase high-performance liquid chromatography. J Chromatogr A 2009; 1216:3961-9. [DOI: 10.1016/j.chroma.2009.03.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Revised: 02/27/2009] [Accepted: 03/06/2009] [Indexed: 11/20/2022]
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46
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Poole CF, Poole SK. Foundations of retention in partition chromatography. J Chromatogr A 2009; 1216:1530-50. [PMID: 19013576 DOI: 10.1016/j.chroma.2008.10.092] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2008] [Revised: 10/22/2008] [Accepted: 10/28/2008] [Indexed: 10/21/2022]
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47
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Causon TJ, Shellie RA, Hilder EF. High temperature liquid chromatography with monolithic capillary columns and pure watereluent. Analyst 2009; 134:440-2. [DOI: 10.1039/b815886j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Heinisch S, Rocca JL. Sense and nonsense of high-temperature liquid chromatography. J Chromatogr A 2009; 1216:642-58. [DOI: 10.1016/j.chroma.2008.11.079] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2008] [Revised: 11/13/2008] [Accepted: 11/20/2008] [Indexed: 10/21/2022]
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49
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Giegold S, Teutenberg T, Tuerk J, Kiffmeyer T, Wenclawiak B. Determination of sulfonamides and trimethoprim using high temperature HPLC with simultaneous temperature and solvent gradient. J Sep Sci 2008; 31:3497-502. [DOI: 10.1002/jssc.200800330] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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50
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Pappa-Louisi A, Nikitas P, Zisi C, Papachristos K. Combined effect of temperature and organic modifier concentration on the retention under single mode gradient conditions in reversed-phase HPLC. J Sep Sci 2008; 31:2953-61. [DOI: 10.1002/jssc.200800302] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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