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Zagst H, Elgert C, Behrends S, Wätzig H. Combination of strong anion exchange liquid chromatography with microchip capillary electrophoresis sodium dodecyl sulfate for rapid two-dimensional separations of complex protein mixtures. Anal Bioanal Chem 2022; 414:1699-1712. [PMID: 34870722 PMCID: PMC8761713 DOI: 10.1007/s00216-021-03797-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 10/13/2021] [Accepted: 11/19/2021] [Indexed: 11/03/2022]
Abstract
Two-dimensional separations provide a simple way to increase the resolution and peak capacity of complex protein separations. The feasibility of a recently developed instrumental approach for two-dimensional separations of proteins was evaluated. The approach is based on the general principle of two-dimensional gel electrophoresis. In the first dimension, semi-preparative strong anion exchange high-performance liquid chromatography is utilized and fractions are collected by means of a fraction collector. They are subsequently analyzed in the second dimension with microchip capillary electrophoresis sodium dodecyl sulfate. Microchip capillary electrophoresis provides the necessary speed (approximately 1 min/fraction) for short analysis. In this study, three different samples were investigated. Different constructs of soluble guanylyl cyclase were expressed in Sf9-cells using the baculovirus expression system. Cell lysates were analyzed and the resulting separations were compared. In our experimental setup, the soluble guanylyl cyclase was identified among hundreds of other proteins in these cell lysates, indicating its potential for screening, process control, or analysis. The results were validated by immunoblotting. Samples from Chinese hamster ovary cell culture before and after a purification step were investigated and approximately 9% less impurities could be observed. The separation patterns obtained for human plasma are closely similar to patterns obtained with two-dimensional gel electrophoresis and a total of 218 peaks could be observed. Overall, the approach was well applicable to all samples and, based on these results, further directions for improvements were identified. .
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Affiliation(s)
- Holger Zagst
- Technische Universität Braunschweig, Institute of Medicinal and Pharmaceutical Chemistry, Beethovenstraße 55, 38106, Braunschweig, Germany
| | - Christin Elgert
- Technische Universität Braunschweig, Institute of Pharmacology, Toxicology and Clinical Pharmacy, Mendelssohnstraße 1, 38106, Braunschweig, Germany
| | - Sönke Behrends
- Technische Universität Braunschweig, Institute of Pharmacology, Toxicology and Clinical Pharmacy, Mendelssohnstraße 1, 38106, Braunschweig, Germany
| | - Hermann Wätzig
- Technische Universität Braunschweig, Institute of Medicinal and Pharmaceutical Chemistry, Beethovenstraße 55, 38106, Braunschweig, Germany.
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Abstract
The circular and linear forms of viroid RNAs can be separated by two-dimensional polyacrylamide gel electrophoresis (PAGE) based on the selective delay in mobility that circular RNAs experience under denaturing conditions. First PAGE separates RNA preparations from viroid-infected plants, and the whole lane from this first gel is next perpendicularly loaded on top of a second gel. Separation continues under new conditions that differ in the degree of denaturation from the first. The result is a two-dimensional separation of the RNAs in which circular and linear molecules are distributed in two parallel diagonals.
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Affiliation(s)
- José-Antonio Daròs
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas-Universitat Politècnica de València), Valencia, Spain.
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Stolz A, Neusüß C. Characterisation of a new online nanoLC-CZE-MS platform and application for the glycosylation profiling of alpha-1-acid glycoprotein. Anal Bioanal Chem 2021. [PMID: 34881393 DOI: 10.1007/s00216-021-03814-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 11/19/2021] [Accepted: 11/30/2021] [Indexed: 11/22/2022]
Abstract
The ever-increasing complexity of biological samples to be analysed by mass spectrometry has led to the necessity of sophisticated separation techniques, including multidimensional separation. Despite a high degree of orthogonality, the coupling of liquid chromatography (LC) and capillary zone electrophoresis (CZE) has not gained notable attention in research. Here, we present a heart-cut nanoLC-CZE-ESI-MS platform to analyse intact proteins. NanoLC and CZE-MS are coupled using a four-port valve with an internal nanoliter loop. NanoLC and CZE-MS conditions were optimised independently to find ideal conditions for the combined setup. The valve setup enables an ideal transfer efficiency between the dimensions while maintaining good separation conditions in both dimensions. Due to the higher loadability, the nanoLC-CZE-MS setup exhibits a 280-fold increased concentration sensitivity compared to CZE-MS. The platform was used to characterise intact human alpha-1-acid glycoprotein (AGP), an extremely heterogeneous N-glycosylated protein. With the nanoLC-CZE-MS approach, 368 glycoforms can be assigned at a concentration of 50 μg/mL as opposed to the assignment of only 186 glycoforms from 1 mg/mL by CZE-MS. Additionally, we demonstrate that glycosylation profiling is accessible for dried blood spot analysis (25 μg/mL AGP spiked), indicating the general applicability of our setup to biological matrices. The combination of high sensitivity and orthogonal selectivity in both dimensions makes the here-presented nanoLC-CZE-MS approach capable of detailed characterisation of intact proteins and their proteoforms from complex biological samples and in physiologically relevant concentrations.
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4
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Zeng L, Yang K, Liu L, Zhang T, Liu H, Tan Z, Lei L. Systematic biological and proteomics strategies to explore the regulation mechanism of Shoutai Wan on recurrent spontaneous Abortion's biological network. J Ethnopharmacol 2020; 263:113156. [PMID: 32763414 DOI: 10.1016/j.jep.2020.113156] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 06/06/2020] [Accepted: 07/02/2020] [Indexed: 06/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Shoutai Wan (STW) is a classic herbal formula for the treatment of recurrent spontaneous abortion (RSA), and clinical studies have shown the effectiveness of STW on RSA. However, the molecular mechanism of STW treatment of RSA is still unclear. METHODS (1) Animal experiments: The normal pregnancy model was established with CBA/J*BALB/C, and the RSA model was established by CBA/J*DBA/2. The RSA model CBA/J*DBA/2 pregnant mice were randomly divided into four groups (RSA model group, STW low, medium and high dose groups) according to the order of pregnancy, respectively. The drug administration starts from the first day of pregnancy to the 14th day of pregnancy. The embryo loss rate (ELR) of each group was calculated. (2) Proteomic analysis of decidual tissue: The total protein of decidual tissue of each group was isolated by solid phase pH gradient 2-DE technique. The differentially expressed protein spots were analyzed and identified by PDQuest images; the peptide quality fingerprinting (PMF) was obtained by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Then, the proteins were identified by Mascot software searching, their functions were identified by bioinformatics strategy. (3) The expression of HSP27, α-enolase and Transferrin was detected by Western blotting and the expression of Annexin A2 and Transferrin was detected by immunohistochemistry. (4) The differential proteins and potential targets were analyzed by systematic biological strategy. RESULTS (1) Compared with the normal group, the ELR in the RSA model group was significantly higher (P < 0.01). Compared with the model group, the ELR in the STW high, medium dose groups was lower (P < 0.01). (2) A 2-DE map of the decidual tissue of the RSA model group, normal pregnancy group, STW low, medium and high dose groups was established. Thirty proteins were identified. (3) The results of western blot showed that the expression of HSP27 and a-enolase in the RSA model group was higher than that in the normal group, and the expression of transferrin was lower (P < 0.01). Compared with the model group, the expression of HSP27 and a-enolase in STW high, medium dose groups was decreased (P < 0.01); Compared with the model group, the expression of Transferrin in the STW high dose group was increased (P < 0.01). (5) A lot of RSA treatment-related targets, biological processes and pathways were found after the systematic biological analysis. CONCLUSION (1) STW may reduce the ELR of the RSA mice. (2) The results of proteomics suggest that RSA is a complex process involving multiple proteins. STW can regulate the expression of various proteins in the decidual tissue of RSA mice, suggesting that it can act on multiple targets. (3) The results of western blotting of HSP27, a-enolase, transferrin were consistent with the results of proteomic analysis. (4) STW may achieve therapeutic effects by interfering with the targets, biological processes and signaling pathways discovered in this study.
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MESH Headings
- Abortion, Habitual/drug therapy
- Abortion, Habitual/genetics
- Animals
- Drugs, Chinese Herbal/isolation & purification
- Drugs, Chinese Herbal/pharmacology
- Drugs, Chinese Herbal/therapeutic use
- Female
- Gene Regulatory Networks/drug effects
- Gene Regulatory Networks/physiology
- Male
- Mice
- Mice, Inbred BALB C
- Mice, Inbred CBA
- Mice, Inbred DBA
- Pregnancy
- Proteomics/methods
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization/methods
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Affiliation(s)
- Liuting Zeng
- Department of rheumatology and clinical immunology, Peking Union Medical college Hospital, Chinese Academy of Medical Sciences & Peking Union Medical college, Beijing, China; Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China.
| | - Kailin Yang
- Capital Medical University, Beijing, China; Beijing Anzhen Hospital, Capital Medical University, Beijing, China.
| | - Liting Liu
- Huazhong University of Science and Technology, Wuhan, Hubei Province, China.
| | - Tianqing Zhang
- Graduate College, University of South China, Hengyang, Hunan Province, China; Department of Cardiology, The First Affiliated Hospital of University of South China, Hengyang, Hunan Province, China.
| | - Huiping Liu
- Hunan University of Chinese Medicine, Changsha, Hunan Province, China.
| | - Zhanwang Tan
- Hunan University of Chinese Medicine, Changsha, Hunan Province, China.
| | - Lei Lei
- Hunan University of Chinese Medicine, Changsha, Hunan Province, China.
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Jooß K, Scholz N, Meixner J, Neusüß C. Heart-cut nano-LC-CZE-MS for the characterization of proteins on the intact level. Electrophoresis 2019; 40:1061-1065. [PMID: 30575976 DOI: 10.1002/elps.201800411] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 12/15/2018] [Accepted: 12/17/2018] [Indexed: 11/08/2022]
Abstract
Multidimensional separation techniques play an increasingly important role in separation science, especially for the analysis of complex samples such as proteins. The combination of reversed-phase liquid chromatography in the nanoscale and CZE is especially beneficial due to their nearly orthogonal separation mechanism and well-suited geometries/dimensions. Here, a heart-cut nano-LC-CZE-MS setup was developed utilizing for the first time a mechanical 4-port valve as LC-CE interface. A model protein mixture containing four different protein species was first separated by nano LC followed by a heart-cut transfer of individual LC peaks and subsequent CZE-MS analysis. In the CZE dimension, various glycoforms of one protein species were separated. Improved separation capabilities were achieved compared to the 1D methods, which was exemplarily shown for ribonuclease B and its different glycosylated forms. LODs in the lower μg/mL range were determined, which are considerably lower compared to traditional CZE-MS. In addition, this study represents the first application of an LC-CE-MS system for intact protein analysis. The nano-LC-CZE-MS system is expected to be applicable to various other analytical challenges.
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Affiliation(s)
- Kevin Jooß
- Faculty of Chemistry, Aalen University, Aalen, Germany.,Research Unit Analytical BioGeoChemistry, Helmholtz Zentrum München, Neuherberg, Germany
| | - Nico Scholz
- Faculty of Chemistry, Aalen University, Aalen, Germany
| | - Jens Meixner
- Faculty of Chemistry, Aalen University, Aalen, Germany
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6
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Beutner A, Herl T, Matysik FM. Selectivity enhancement in capillary electrophoresis by means of two-dimensional separation or dual detection concepts. Anal Chim Acta 2018; 1057:18-35. [PMID: 30832915 DOI: 10.1016/j.aca.2018.11.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 11/01/2018] [Accepted: 11/19/2018] [Indexed: 12/18/2022]
Abstract
For the identification and quantification of analytes in complex samples, highly selective analytical strategies are required. The selectivity of single separation techniques such as gas chromatography (GC), liquid chromatography (LC), or capillary electrophoresis (CE) with common detection principles can be enhanced by hyphenating orthogonal separation techniques but also by using complementary detection systems. In this review, two-dimensional systems containing CE in at least one dimension are reviewed, namely LC-CE or 2D CE systems. Particular attention is paid to the aspect of selectivity enhancement due to the orthogonality of the different separation mechanisms. As an alternative concept, dual detection approaches are reviewed using the common detectors of CE such as UV/VIS, laser-induced fluorescence, capacitively coupled contactless conductivity (C4D), electrochemical detection, and mass spectrometry. Special emphasis is given to dual detection systems implementing the highly flexible C4D as one detection component. Selectivity enhancement can be achieved in case of complementarity of the different detection techniques.
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Affiliation(s)
- Andrea Beutner
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
| | - Thomas Herl
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
| | - Frank-Michael Matysik
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany.
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7
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Schlecht J, Jooß K, Neusüß C. Two-dimensional capillary electrophoresis-mass spectrometry (CE-CE-MS): coupling MS-interfering capillary electromigration methods with mass spectrometry. Anal Bioanal Chem 2018; 410:6353-6359. [PMID: 29862434 DOI: 10.1007/s00216-018-1157-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/17/2018] [Accepted: 05/23/2018] [Indexed: 11/24/2022]
Abstract
Electromigration separation techniques often demand certain compounds in the electrolyte to achieve the required selectivity and efficiency. These compounds, including the electrolyte itself, ampholytes, polymeric compounds for sieving, complexing agents, tensides, etc. are often non-volatile. Thus, interference with the electrospray ionization process is a common issue, impeding direct coupling of such electrolyte systems to mass spectrometry. Still, several options exist to obtain mass spectra after separation, including offline fractionation, alternative ionization, dilution, or the change to volatile constituents. In the first part of this article, these methods are discussed. However, all of these options are a compromise of separation performance and sensitivity of mass spectrometric detection. Two-dimensional capillary electrophoresis-mass spectrometry (CE-CE-MS) systems represent a promising alternative to the aforementioned challenges, as they allow the use of existing methods with best separation performance in combination with sensitive mass characterization. In this context, the second part of this article is dedicated to the advantages, limitations, and applications of this approach. Finally, an outlook towards future developments is given.
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Affiliation(s)
- Johannes Schlecht
- Faculty of Chemistry, Aalen University, Beethovenstrasse 1, 73430, Aalen, Germany.,Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University Jena, Philosophenweg 14, 07743, Jena, Germany
| | - Kevin Jooß
- Faculty of Chemistry, Aalen University, Beethovenstrasse 1, 73430, Aalen, Germany.,Research Unit Analytical BioGeoChemistry, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Christian Neusüß
- Faculty of Chemistry, Aalen University, Beethovenstrasse 1, 73430, Aalen, Germany.
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8
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Stütz L, Weiss SC, Schulz W, Schwack W, Winzenbacher R. Selective two-dimensional effect-directed analysis with thin-layer chromatography. J Chromatogr A 2017; 1524:273-282. [PMID: 29031972 DOI: 10.1016/j.chroma.2017.10.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 08/17/2017] [Accepted: 10/04/2017] [Indexed: 01/12/2023]
Abstract
There are thousands of organic trace substances in the environment that are not fully characterized, and evaluation of their relevance to the ecosystem is difficult. Effect-directed analysis (EDA) is a suitable tool to assess the effects of a substance via in-vitro bioassays, which can provide information about the relevance of the substance. High-performance thin-layer chromatography (HPTLC) has been shown to be a good method for fractionation. Environmental samples, however, often have high complexity, which is why the peak capacity of HPTLC is not sufficient. Therefore, this study focused on the development of selective two-dimensional (2D) HPTLC-EDA to increase the peak capacity and facilitate the identification of effective compounds. Thus, only effective zones were selected in the first dimension in terms of heart-cutting and were transferred to the second dimension through elution head-based extraction. Three 2D approaches were developed and validated. The best results in terms of peak capacity and orthogonality were achieved when the retardation factors of the first dimension were used to adjust the mobile phase (MP) for the second dimension. Applying the acetylcholinesterase (AChE) inhibition assay as an example EDA, analysis of spiked surface water by 2D HPTLC-EDA allowed zones with neurotoxic effects to responsible substances to be assigned. The 2D separation reduced the complexity of effective zones and thus facilitated the subsequent identification of effective compounds. Knowledge about a substancés effects enabled assessment of its relevance to the environment.
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Affiliation(s)
- Lena Stütz
- Laboratory for Operation Control and Research, Zweckverband Landeswasserversorgung, Am spitzigen Berg 1, 89129 Langenau, Germany; Institute of Food Chemistry, University of Hohenheim, Garbenstraße 28, 70599 Stuttgart, Germany.
| | - Stefan C Weiss
- Laboratory for Operation Control and Research, Zweckverband Landeswasserversorgung, Am spitzigen Berg 1, 89129 Langenau, Germany.
| | - Wolfgang Schulz
- Laboratory for Operation Control and Research, Zweckverband Landeswasserversorgung, Am spitzigen Berg 1, 89129 Langenau, Germany.
| | - Wolfgang Schwack
- Institute of Food Chemistry, University of Hohenheim, Garbenstraße 28, 70599 Stuttgart, Germany.
| | - Rudi Winzenbacher
- Laboratory for Operation Control and Research, Zweckverband Landeswasserversorgung, Am spitzigen Berg 1, 89129 Langenau, Germany.
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9
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Zhang H, Ma S, Yao Y, Li Y, Li Y, Ou J, Ye M, Wei Y. Facile preparation of multi-functionalized hybrid monoliths via two-step photo-initiated reactions for two-dimensional liquid chromatography-mass spectrometry. J Chromatogr A 2017; 1524:135-142. [PMID: 28985904 DOI: 10.1016/j.chroma.2017.09.061] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 08/25/2017] [Accepted: 09/25/2017] [Indexed: 11/28/2022]
Abstract
A facile approach was developed to prepare hybrid monoliths with different functions via two-step photo-initiated reactions. Firstly, acrylopropyl polyhedral oligomertic silsesquioxane (acryl-POSS) and propargyl acrylate (PA) were used as precursors to synthesize alkynyl-functionalized hybrid monoliths via photo-initiated free radical polymerization. Secondly, the hybrid monoliths were modified with 1-octadecanethiol (ODT) and sodium 3-mercapto-1-propanesulfonate (SMPS) via photo-initiated thiol-yne click reaction to prepare reversed-phase (RP) and strong cation-exchange (SCX) hybrid monoliths, respectively. The results of chromatographic characterization indicated that the column efficiencies for alkylbenzenes on ODT-modified hybrid monolith reached 84,000-87,700 plates per meter at the velocity of 0.58mm/s, and also revealed a retention-independent efficient performance of small molecules in isocratic elution. The SMPS-modified hybrid monolith exhibited both hydrophobicity and ion-exchange mechanisms, and the dynamic binding capacity was calculated to be 1.4×10-4μmol/cm. Human Hela cells tryptic digest was well separated on ODT-modified hybrid monolith in one-dimensional RPLC-MS/MS, and 2786 unique peptides and 685 proteins were identified. Furthermore, the SMPS-modified monolith coupled with ODT-modified monolith was used for two-dimensional separation of human Hela cells tryptic digest in SCX-RPLC-MS/MS, and the results showed that 9744 unique peptides and 2749 proteins were identified. Compared to those identified in one-dimensional RP system, the total numbers of unique peptides and proteins identified in SCX-RP system increased by 249.7% and 301.3%, respectively.
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Affiliation(s)
- Haiyang Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Material Science, Northwest University, Xi'an 710127, PR China; CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China
| | - Shujuan Ma
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Material Science, Northwest University, Xi'an 710127, PR China; CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China
| | - Yating Yao
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China
| | - Yanan Li
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China
| | - Ya Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Material Science, Northwest University, Xi'an 710127, PR China; CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China
| | - Junjie Ou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China
| | - Mingliang Ye
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China
| | - Yinmao Wei
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Material Science, Northwest University, Xi'an 710127, PR China.
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10
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Gajos R, Chomicki A, Polak B, Dzido TH. Preliminary results for interval feeding the orthogonal pressurized planar electrochromatography system with sample solution for its preparative separation. J Chromatogr A 2017; 1499:183-189. [PMID: 28412012 DOI: 10.1016/j.chroma.2017.03.088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 03/29/2017] [Accepted: 03/31/2017] [Indexed: 11/29/2022]
Abstract
The orthogonal pressurized planar electrochromatography (OPPEC) is an example of 2-D separation technique, in which two simultaneous and orthogonal processes of electrophoresis and chromatography are involved in the separation mechanism. In the case of preparative separation of substances characterized by different electrophoretic mobility, such separation system can be constantly fed with the sample solution and the separated components can be constantly collected at its outlet. In the paper, as opposed to the previous studies, we discuss the capabilities of OPPEC technique for preparative separation of substances characterized by the same electrophoretic mobility. According to the proposed solution, the separation system can be periodically fed with the sample solution and separated components can be collected alternately at its outlet. The advantages of this new approach over the column chromatography with regard to the separation of complex mixtures have been signaled.
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Affiliation(s)
- Rafał Gajos
- Department of Physical Chemistry, Chair of Chemistry, Medical University, Lublin, Poland.
| | - Adam Chomicki
- Department of Physical Chemistry, Chair of Chemistry, Medical University, Lublin, Poland
| | - Beata Polak
- Department of Physical Chemistry, Chair of Chemistry, Medical University, Lublin, Poland
| | - Tadeusz H Dzido
- Department of Physical Chemistry, Chair of Chemistry, Medical University, Lublin, Poland.
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11
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Fan Y, Fu Y, Fu Q, Cai J, Xin H, Dai M, Jin Y. Purification of flavonoids from licorice using an off-line preparative two-dimensional normal-phase liquid chromatography/reversed-phase liquid chromatography method. J Sep Sci 2016; 39:2710-9. [PMID: 27214649 DOI: 10.1002/jssc.201501393] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 04/21/2016] [Accepted: 05/13/2016] [Indexed: 11/06/2022]
Abstract
An orthogonal (71.9%) off-line preparative two-dimensional normal-phase liquid chromatography/reversed-phase liquid chromatography method coupled with effective sample pretreatment was developed for separation and purification of flavonoids from licorice. Most of the nonflavonoids were firstly removed using a self-made Click TE-Cys (60 μm) solid-phase extraction. In the first dimension, an industrial grade preparative chromatography was employed to purify the crude flavonoids. Click TE-Cys (10 μm) was selected as the stationary phase that provided an excellent separation with high reproducibility. Ethyl acetate/ethanol was selected as the mobile phase owing to their excellent solubility for flavonoids. Flavonoids co-eluted in the first dimension were selected for further purification using reversed-phase liquid chromatography. Multiple compounds could be isolated from one normal-phase fraction and some compounds with bad resolution in one-dimensional liquid chromatography could be prepared in this two-dimensional system owing to the orthogonal separation. Moreover, this two-dimensional liquid chromatography method was beneficial for the preparation of relatively trace flavonoid compounds, which were enriched in the first dimension and further purified in the second dimension. Totally, 24 flavonoid compounds with high purity were obtained. The results demonstrated that the off-line two-dimensional liquid chromatography method was effective for the preparative separation and purification of flavonoids from licorice.
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Affiliation(s)
- Yunpeng Fan
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai, P. R. China
| | - Yanhui Fu
- Hai Nan Normal University, Haikou, China
| | - Qing Fu
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai, P. R. China
| | - Jianfeng Cai
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai, P. R. China
| | - Huaxia Xin
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai, P. R. China
| | - Mei Dai
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai, P. R. China
| | - Yu Jin
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai, P. R. China
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12
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Abstract
Separation and determination of proteins by capillary isoelectric focusing (CIEF) and mass spectrometry (MS) are essential and complementary techniques in the field of bioanalysis. The hyphenation of these two techniques is challenging due to the nonvolatile substances required for the CIEF separation. An additional separation step prior to MS enables the removal of the nonvolatile substances. However, it is complicated due to the small transfer volume and the required high voltages in the CIEF process. In order to remove nonvolatile substances and transfer the analytes toward the mass spectrometer, we applied a four-port valve to couple CIEF online to capillary electrophoresis-mass spectrometry. To demonstrate the power of this concept, hemoglobin and glycated hemoglobin with an isoelectric point difference of 0.037 were separated via isoelectric focusing and characterized by MS. In general, this setup guaranties interference-free mass spectra and will provide an information-rich and sensitive top down protein characterization. Graphical abstract Interference free coupling of capillary isoelectric focusing to mass spectrometry by applying a mechanical valve. The focused proteins were tranferred from the isoelectric focusing to capillary electrophoresis by a mechanical valve. Afterwards, the transferred protein was sepearated from ionization interfering substances in the capillary electrophoresis prior to the mass spectrometry detection.
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Affiliation(s)
- Jens Hühner
- Faculty of Chemistry, Aalen University, Beethovenstr. 1, 73430, Aalen, Germany.,Institute of Pharmaceutical Science, University of Tübingen, Auf der Morgenstelle 8, 72076, Tübingen, Germany
| | - Christian Neusüß
- Faculty of Chemistry, Aalen University, Beethovenstr. 1, 73430, Aalen, Germany.
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Jayaprakasha GK, Gowda GN, Marquez S, Patil BS. Rapid separation and quantitation of curcuminoids combining pseudo two-dimensional liquid flash chromatography and NMR spectroscopy. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 937:25-32. [PMID: 24013126 PMCID: PMC3832181 DOI: 10.1016/j.jchromb.2013.08.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2013] [Revised: 08/08/2013] [Accepted: 08/09/2013] [Indexed: 12/29/2022]
Abstract
Rapid separation, characterization and quantitation of curcuminoids are important owing to their numerous pharmacological properties including antimicrobial, antiviral, antifungal, anticancer, and anti-inflammatory activities. In the present study, pseudo two-dimensional liquid flash chromatography was used for the separation of four curcuminoids (curcumin, demethoxy curcumin, bisdemethoxy curcumin and dihydro bisdemethoxy curcumin) for the first time. Silica and diol columns were used for separation of curcuminoids using gradient mobile phase. The separated peaks were monitored at 244, 360nm to obtain four compounds. The purity of compounds were determined by rapid quantitative (1)H NMR (qNMR) using 3-(trimethylsilyl) propionic-(2,2,3,3-d4) acid sodium salt (TSP-d4) (0.012%) in D2O. These results were compared with those obtained by HPLC method. The purity of isolated curcuminoids using pseudo 2D chromatography was found to be in the range of 92.4-95.45%. The structures of these compounds were characterized unambiguously using (13)C (APT) NMR spectra. The developed pseudo 2D separation technique has the advantage of simplified automation with shorter run time compared to conventional separation techniques. The method that combines rapid pseudo 2D separation and simple quantitation using qNMR reported herein can be of wide utility for routine analysis of curcuminoids in complex mixtures.
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Affiliation(s)
- G. K. Jayaprakasha
- Vegetable and Fruit Improvement Center, Department of Horticulture Sciences, Texas A&M University, College Station, TX 77845-2119
| | - G.A. Nagana Gowda
- Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine, University of Washington, 850 Republican Street, Seattle, WA 98109
| | - Sixto Marquez
- Vegetable and Fruit Improvement Center, Department of Horticulture Sciences, Texas A&M University, College Station, TX 77845-2119
| | - Bhimanagouda S. Patil
- Vegetable and Fruit Improvement Center, Department of Horticulture Sciences, Texas A&M University, College Station, TX 77845-2119
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