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Rye TK, Lee CY, Zellner A, Moen SH, Dowlatshah S, Grønhaug Halvorsen T, Pedersen-Bjergaard S, Hansen FA. Electromembrane extraction of peptides based on charge, hydrophobicity, and size - A large-scale fundamental study of the extraction window. J Sep Sci 2024; 47:e2400292. [PMID: 39091169 DOI: 10.1002/jssc.202400292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 07/14/2024] [Accepted: 07/15/2024] [Indexed: 08/04/2024]
Abstract
This study investigated the capability of electromembrane extraction (EME) as a general technique for peptides, by extracting complex pools of peptides comprising in total of 5953 different substances, varying in size from seven to 16 amino acids. Electromembrane extraction was conducted from a sample adjusted to pH 3.0 and utilized a liquid membrane consisting of 2-nitrophenyl octyl ether and carvacrol (1:1 w/w), containing 2% (w/w) di(2-ethylhexyl) phosphate. The acceptor phase was 50 mM phosphoric acid (pH 1.8), the extraction time was 45 min, and 10 V was used. High extraction efficiency, defined as a higher peptide signal in the acceptor than the sample after extraction, was achieved for 3706 different peptides. Extraction efficiencies were predominantly influenced by the hydrophobicity of the peptides and their net charge in the sample. Hydrophobic peptides were extracted with a net charge of +1, while hydrophilic peptides were extracted when the net charge was +2 or higher. A computational model based on machine learning was developed to predict the extractability of peptides based on peptide descriptors, including the grand average of hydropathy index and net charge at pH 3.0 (sample pH). This research shows that EME has general applicability for peptides and represents the first steps toward in silico prediction of extraction efficiency.
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Affiliation(s)
| | - Chien-Yun Lee
- School of Life Sciences, Technical University of Munich, Freisng, Germany
| | - Andreas Zellner
- School of Life Sciences, Technical University of Munich, Freisng, Germany
| | | | | | | | - Stig Pedersen-Bjergaard
- Department of Pharmacy, University of Oslo, Blindern, Norway
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Dowlatshah S, Rye TK, Hansen FA, Halvorsen TG, Pedersen-Bjergaard S. Parallel electromembrane extraction of peptides with monoterpene and medium-length fatty acid deep eutectic solvents. Anal Chim Acta 2024; 1297:342360. [PMID: 38438237 DOI: 10.1016/j.aca.2024.342360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/01/2024] [Accepted: 02/06/2024] [Indexed: 03/06/2024]
Abstract
BACKGROUND Electromembrane extraction (EME) involves the process of mass transfer of charged analytes from an aqueous sample through an organic liquid membrane into an aqueous acceptor medium under the influence of an electrical field. Successful solvation of the analyte within the liquid membrane is of paramount importance and involves molecular interactions with the liquid membrane. In this comprehensive investigation, parallel EME was examined using a training set of 13 model peptides employing deep eutectic solvents as the liquid membrane. These deep eutectic solvents were formulated by mixing specific monoterpenes (thymol, menthol, camphor) with medium-chain fatty acids (1-octanoic acid and 1-decanoic acid). RESULTS From an array of different liquid membrane compositions explored, it was revealed that the combination of camphor and 1-decanoic acid (in a 1:1 w/w ratio) with 2% di (2-ethylhexyl) phosphate (DEHP) delivered the most efficient extraction system. The solvation of the model peptides within this liquid membrane predominantly relied on ionic interactions between protonated basic functionalities and DEHP, along with hydrogen bond interactions between the deprotonated acid functionalities (hydrogen bond acceptor) and 1-decanoic acid (hydrogen bond donor). Selectivity was modulated by the pH of the sample and acceptor solutions, with a direct correlation to the polarity and net charge of the model peptides. The ionization of 1-decanoic acid in the interfacial region between the sample and liquid membrane emerged as an important factor influencing the selectivity. SIGNIFICANCE AND NOVELTY Although parallel EME of peptides has been reported previously, the current liquid membrane provides an extraction system with sufficient stability for the first time. Selective extraction of peptides through EME holds substantial promise within the realm of next-generation environmentally-friendly sample preparation methodologies. The findings presented in this paper contribute significantly to our fundamental understanding of these processes, and may serve as an important reference for the development of future methods in this field.
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Affiliation(s)
- Samira Dowlatshah
- Department of Pharmacy, University of Oslo, P.O Box 1068 Blindern, 0316, Oslo, Norway
| | - Torstein Kige Rye
- Department of Pharmacy, University of Oslo, P.O Box 1068 Blindern, 0316, Oslo, Norway
| | - Frederik André Hansen
- Department of Pharmacy, University of Oslo, P.O Box 1068 Blindern, 0316, Oslo, Norway
| | | | - Stig Pedersen-Bjergaard
- Department of Pharmacy, University of Oslo, P.O Box 1068 Blindern, 0316, Oslo, Norway; Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark.
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Dowlatshah S, Hansen FA, Zhou C, Ramos-Payán M, Halvorsen TG, Pedersen-Bjergaard S. Electromembrane extraction of peptides based on hydrogen bond interactions. Anal Chim Acta 2023; 1275:341610. [PMID: 37524472 DOI: 10.1016/j.aca.2023.341610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 06/17/2023] [Accepted: 07/09/2023] [Indexed: 08/02/2023]
Abstract
BACKGROUND Electromembrane extraction (EME) of peptides reported in the scientific literature involve transfer of net positively charged peptides from an aqueous sample, through a liquid membrane, and into an aqueous acceptor solution, under the influence of an electrical field. The liquid membrane comprises an organic solvent, containing an ionic carrier. The purpose of the ionic carrier is to facilitate peptide solvation in the organic solvent based on ionic interactions. Unfortunately, ionic carriers increase the conductivity of the liquid membrane; the current in the system increases, the electrolysis in sample and acceptor is accelerated, and the extraction system tend to be unstable and suffers from drifting pH. RESULTS In the present work, a broad selection of organic solvents were tested as pure liquid membrane for EME of peptides, without ionic carrier. Several phosphates provided high mass transfer, and tri(pentyl) phosphate was selected since this solvent also provided high operational stability. Among 16 different peptides used as model analytes, tri(pentyl) phosphate extracted those with net charge +1 and with no more than two polar side chains. Tri(pentyl) phosphate served as a very strong hydrogen bond acceptor, while the protonated peptides were hydrogen bond donors. By such, hydrogen bonding served as the primary interactions responsible for mass transfer. Tri(pentyl) phosphate as liquid membrane, could exhaustively extract leu-enkephalin, met-enkephalin, and endomorphin from human blood plasma and detected by LC-MS/MS. Calibration curves were linear (r2 > 0.99) within a concentration range from 1 to 500 ng/mL, and a relative standard deviation within 12% was observed for precision studies. SIGNIFICANCE The current experiments are important because they indicate that small peptides of low polarity may be extracted selectively in EME based on hydrogen bond interactions, in systems not suffering from electrolysis.
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Affiliation(s)
- Samira Dowlatshah
- Department of Pharmacy, University of Oslo, P.O Box 1068 Blindern, 0316, Oslo, Norway
| | - Frederik André Hansen
- Department of Pharmacy, University of Oslo, P.O Box 1068 Blindern, 0316, Oslo, Norway
| | - Chen Zhou
- Department of Pharmacy, University of Oslo, P.O Box 1068 Blindern, 0316, Oslo, Norway; West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, 610041, China
| | - María Ramos-Payán
- Department of Analytical Chemistry, Faculty of Chemistry, University of Seville, c/Prof. García González s/n, 41012, Seville, Spain
| | | | - Stig Pedersen-Bjergaard
- Department of Pharmacy, University of Oslo, P.O Box 1068 Blindern, 0316, Oslo, Norway; Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark.
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Tůma P. Progress in on-line, at-line, and in-line coupling of sample treatment with capillary and microchip electrophoresis over the past 10 years: A review. Anal Chim Acta 2023; 1261:341249. [PMID: 37147053 DOI: 10.1016/j.aca.2023.341249] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/20/2023] [Accepted: 04/21/2023] [Indexed: 05/07/2023]
Abstract
The review presents an evaluation of the development of on-line, at-line and in-line sample treatment coupled with capillary and microchip electrophoresis over the last 10 years. In the first part, it describes different types of flow-gating interfaces (FGI) such as cross-FGI, coaxial-FGI, sheet-flow-FGI, and air-assisted-FGI and their fabrication using molding into polydimethylsiloxane and commercially available fittings. The second part deals with the coupling of capillary and microchip electrophoresis with microdialysis, solid-phase, liquid-phase, and membrane based extraction techniques. It mainly focuses on modern techniques such as extraction across supported liquid membrane, electroextraction, single drop microextraction, head space microextraction, and microdialysis with high spatial and temporal resolution. Finally, the design of sequential electrophoretic analysers and fabrication of SPE microcartridges with monolithic and molecularly imprinted polymeric sorbents are discussed. Applications include the monitoring of metabolites, neurotransmitters, peptides and proteins in body fluids and tissues to study processes in living organisms, as well as the monitoring of nutrients, minerals and waste compounds in food, natural and wastewater.
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Affiliation(s)
- Petr Tůma
- Department of Hygiene, Third Faculty of Medicine, Charles University, Ruská 87, 100 00, Prague 10, Czech Republic.
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Martins RO, de Araújo GL, Simas RC, Chaves AR. ELECTROMEMBRANE EXTRACTION (EME): FUNDAMENTALS AND APPLICATIONS. TALANTA OPEN 2023. [DOI: 10.1016/j.talo.2023.100200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023] Open
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He Y, Miggiels P, Drouin N, Lindenburg PW, Wouters B, Hankemeier T. An automated online three-phase electro-extraction setup with machine-vision process monitoring hyphenated to LC-MS analysis. Anal Chim Acta 2022; 1235:340521. [DOI: 10.1016/j.aca.2022.340521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 10/07/2022] [Accepted: 10/12/2022] [Indexed: 11/29/2022]
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Development of a fast, online three-phase electroextraction hyphenated to fast liquid chromatography–mass spectrometry for analysis of trace-level acid pharmaceuticals in plasma. Anal Chim Acta 2022; 1192:339364. [DOI: 10.1016/j.aca.2021.339364] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 12/05/2021] [Accepted: 12/07/2021] [Indexed: 11/20/2022]
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Eie LV, Pedersen-Bjergaard S, Hansen FA. Electromembrane extraction of polar substances - Status and perspectives. J Pharm Biomed Anal 2022; 207:114407. [PMID: 34634529 DOI: 10.1016/j.jpba.2021.114407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 09/20/2021] [Accepted: 09/30/2021] [Indexed: 12/15/2022]
Abstract
In this article, the scientific literature on electromembrane extraction (EME) of polar substances (log P < 2) is reviewed. EME is an extraction technique based on electrokinetic migration of analyte ions from an aqueous sample, across an organic supported liquid membrane (SLM), and into an aqueous acceptor solution. Because extraction is based on voltage-assisted partitioning, EME is fundamentally suitable for extraction of polar and ionizable substances that are challenging in many other extraction techniques. The article provides an exhaustive overview of papers on EME of polar substances. From this, different strategies to improve the mass transfer of polar substances are reviewed and critically discussed. These strategies include different SLM chemistries, modification of supporting membranes, sorbent additives, aqueous solution chemistry, and voltage/current related strategies. Finally, the future applicability of EME for polar substances is discussed. We expect EME in the coming years to be developed towards both very selective targeted analysis, as well as untargeted analysis of polar substances in biomedical applications such as metabolomics and peptidomics.
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Affiliation(s)
- Linda Vårdal Eie
- Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway
| | - Stig Pedersen-Bjergaard
- Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway; Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Frederik André Hansen
- Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway.
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Mass spectrometry based metabolomics of volume-restricted in-vivo brain samples: Actual status and the way forward. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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A study on determination of theophylline in plasma and urine sample using electromembrane extraction combined with high-performance liquid chromatography–ultraviolet. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-021-01889-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Ultrasound-assisted electromembrane extraction of clonazepam from plasma and determination using capillary electrophoresis. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1181:122928. [PMID: 34536833 DOI: 10.1016/j.jchromb.2021.122928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 08/06/2021] [Accepted: 09/01/2021] [Indexed: 11/20/2022]
Abstract
In this work, ultrasound-assisted electromembrane extraction (UA-EME) coupled with capillary electrophoresis (CE) and diode array detection (DAD) was developed for the determination of clonazepam from plasma samples. A comparative study was carried out between conventional EME and UA-EME methods to investigate the influence of the ultrasound waves on the extraction efficiency. The central composite design was used for the optimization of the variables affecting these methods to achieve the best extraction efficiency. Under optimal extraction conditions, the UA-EME provided better extraction recovery in a shorter time (58% in 13 min) than the EME method (42% in 30 min). Ultrasound reduces the extraction time and increased recovery by reducing the thickness of the barrier layer. In addition, this method provided a higher pre-concentration factor (203) and a lower limit of detection (3 ng mL-1) with good repeatability (RSDs were less than 10.11%).
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Rye TK, Martinovic G, Eie LV, Hansen FA, Halvorsen TG, Pedersen-Bjergaard S. Electromembrane extraction of peptides using deep eutectic solvents as liquid membrane. Anal Chim Acta 2021; 1175:338717. [PMID: 34330439 DOI: 10.1016/j.aca.2021.338717] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/28/2021] [Accepted: 05/29/2021] [Indexed: 11/18/2022]
Abstract
For the first time, we report electromembrane extraction (EME) of peptides using deep eutectic solvent (DES) as supported liquid membrane (SLM). DES were mixtures of coumarin, camphor, DL-menthol and thymol. Sixteen model peptides were extracted from 100 μL 50 mM phosphate buffer solution (pH 3.0), through the SLM, and into 100 μL acceptor solution consisting of 50 mM phosphoric acid (pH 1.8). EME was performed in 96-well format with 30 V to facilitate extraction of positively charged peptides. The model peptides comprised three to 13 amino acids, and differed significantly in terms of acid/base functionalities and polarity. We found pure DES to be inefficient for EME of peptides. However, with addition of a small amount of the ionic carrier di(2-ethylhexyl) phosphate (DEHP) to the DES, the extraction efficiency increased due to ionic interactions. With the most efficient SLM; coumarin and thymol mixed in molar ratio (1:2) with 2.0% (v/v) DEHP, average recovery after 15 min was 55%; five peptides were extracted with recovery > 80%, nine peptides with recoveries in the range 40-80%, and two peptides were not extracted (recovery < 5%). When extraction time was extended to 45 min, average extraction recovery increased to 83%. Extraction recoveries with DES were higher than previously reported in the literature for the same model peptides.
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Affiliation(s)
- Torstein Kige Rye
- Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316, Oslo, Norway
| | - Gordana Martinovic
- Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316, Oslo, Norway
| | - Linda Vårdal Eie
- Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316, Oslo, Norway
| | - Frederik André Hansen
- Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316, Oslo, Norway
| | | | - Stig Pedersen-Bjergaard
- Department of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316, Oslo, Norway; Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark.
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Dolatabadi R, Mohammadi A, Nojavan S, Yaripour S, Tafakhori A, Shirangi M. Electromembrane extraction‐high‐performance liquid chromatography‐ultraviolet detection of phenobarbital and phenytoin in human plasma, saliva, and urine. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100016] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Roshanak Dolatabadi
- Department of Drug and Food Control, Faculty of Pharmacy Tehran University of Medical Sciences Tehran Iran
| | - Ali Mohammadi
- Department of Drug and Food Control, Faculty of Pharmacy Tehran University of Medical Sciences Tehran Iran
- Nanotechnology Research Centre, Faculty of Pharmacy Tehran University of Medical Sciences Tehran Iran
| | - Saeed Nojavan
- Department of Analytical Chemistry and Pollutants Shahid Beheshti University Tehran Iran
| | - Saeid Yaripour
- Department of Drug and Food Control, Faculty of Pharmacy Tehran University of Medical Sciences Tehran Iran
| | - Abbas Tafakhori
- Iranian Center of Neurological Research, Neuroscience Institute, Imam Khomeini Hospital Complex Tehran University of Medical Sciences Tehran Iran
| | - Mehrnoosh Shirangi
- Department of Drug and Food Control, Faculty of Pharmacy Tehran University of Medical Sciences Tehran Iran
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He Y, Miggiels P, Wouters B, Drouin N, Guled F, Hankemeier T, Lindenburg PW. A high-throughput, ultrafast, and online three-phase electro-extraction method for analysis of trace level pharmaceuticals. Anal Chim Acta 2021; 1149:338204. [DOI: 10.1016/j.aca.2021.338204] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 12/29/2020] [Accepted: 01/04/2021] [Indexed: 12/24/2022]
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Electromembrane extraction of peptides and amino acids - status and perspectives. Bioanalysis 2021; 13:277-289. [PMID: 33543669 DOI: 10.4155/bio-2020-0285] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
This article reviews the scientific literature on electromembrane extraction (EME) of peptides and amino acids. In EME, target analytes are extracted from aqueous sample, through a supported liquid membrane (organic) and into a microliter volume of aqueous buffer (acceptor). Experimental conditions and performance for EME of peptides and amino acids are reviewed and discussed in detail, providing readers with an overview and basic understanding of the subject. In addition, this review discuss the potential for future applications, and scientific questions that need to be addressed for EME of peptides and amino acids to be generally accepted. EME is under commercialization, and therefore we expect it will be an active area of research in the near future.
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Yuan J, Cao H, Du X, Chen T, Ma A, Pan J. Nonaqueous Miscible Liquid-Liquid Electroextraction for Fast Exhaustive Enrichment of Ultratrace Analytes by an Exponential Transfer and Deceleration Mechanism. Anal Chem 2021; 93:1458-1465. [PMID: 33375784 DOI: 10.1021/acs.analchem.0c03478] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Conventional electrical-field-assisted sample preparation (EFASP) methods rely on analyte transfer between immiscible phases and require at least one aqueous phase in contact with the electrode. In this paper, we report a novel nonaqueous miscible liquid-liquid electroextraction (NMLEE) technique that enables fast exhaustive enrichment of ultratrace analytes from a milliliter-level donor in a vial to a microliter-level acceptor in a tube. Miscible nonaqueous solvents are used for the donor and acceptor to overcome common EFASP problems such as high charge or mass transfer resistance, loss of analytes in the membrane phase, water electrolysis, back-extraction, bubble generation, and difficulties in the application of high voltage for fast migration. According to theoretical derivation and experimental verification results, the concentrations of analytes in the donor and their migration velocity in the acceptor both decrease exponentially with time, and the extraction recovery correlates linearly with the current variation. These mechanisms result in efficient enrichment by forming an analyte-enriched zone and allow the extraction progress and recovery to be monitored and estimated based on the current variation. NMLEE was coupled with liquid chromatography-mass spectrometry to analyze 10 amphetamine-type drugs, atropine, nortriptyline, and methadone in blood and urine samples. This method provided low limits of detection (0.003-0.1 ng·mL-1), satisfactory extraction recoveries (89.6-104.1%), and RSDs (<12.3% for intraday and <8.8% for interday), which met the requirements of the ICH guidelines. This study may contribute to the further development of EFASP methods for effective ultratrace analyses in forensic science.
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Affiliation(s)
- Jiahao Yuan
- Department of Hygiene Detection Center, School of Public Health, Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research), #1023 South Sha-Tai Rd, Guangzhou, 510515 Guangdong, China
| | - Hongjie Cao
- Department of Hygiene Detection Center, School of Public Health, Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research), #1023 South Sha-Tai Rd, Guangzhou, 510515 Guangdong, China
| | - Xiaotong Du
- Department of Hygiene Detection Center, School of Public Health, Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research), #1023 South Sha-Tai Rd, Guangzhou, 510515 Guangdong, China
| | - Tengteng Chen
- Department of Hygiene Detection Center, School of Public Health, Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research), #1023 South Sha-Tai Rd, Guangzhou, 510515 Guangdong, China
| | - Ande Ma
- Department of Hygiene Detection Center, School of Public Health, Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research), #1023 South Sha-Tai Rd, Guangzhou, 510515 Guangdong, China
| | - Jialiang Pan
- Department of Hygiene Detection Center, School of Public Health, Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research), #1023 South Sha-Tai Rd, Guangzhou, 510515 Guangdong, China
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Wu S, Zhu R, Dong Y, Huang C, Shen X. Electromembrane extraction of barbiturates using tributyl phosphate as an efficient supported liquid membrane. Anal Chim Acta 2020; 1129:118-125. [DOI: 10.1016/j.aca.2020.07.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Revised: 07/11/2020] [Accepted: 07/15/2020] [Indexed: 01/17/2023]
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Impact of ion balance in electromembrane extraction. Anal Chim Acta 2020; 1124:129-136. [PMID: 32534665 DOI: 10.1016/j.aca.2020.05.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/12/2020] [Accepted: 05/14/2020] [Indexed: 01/07/2023]
Abstract
Electromembrane extraction (EME) involves transfer of analyte ions from aqueous sample, through a supported liquid membrane (SLM), and into an aqueous acceptor solution under the influence of an external electrical field. In addition to target analyte ions, the sample also contains matrix ions, and both the sample and acceptor contains background buffer ions to control pH. The ratio between the total amount of ions in sample and acceptor defines the ion balance (χ). Previous publications have discussed the impact of ion balance, but conclusions are contradictory. Therefore, the current paper investigated the ion balance in more detail. From a theoretical point of view, low χ-values favor EME; buffer anions at high concentration in the acceptor migrate into the SLM, while target cations enters the SLM from the sample to maintain electroneutrality. A large number of experiments was performed in this paper to investigate the practical impact of ion balance. Twelve basic drugs were used as model analytes (0.0 < log P < 5.0), and 2-nitrophenyl octyl ether (NPOE) and NPOE + 5% di(2-ethylhexyl) phosphate (DEHP) were used as SLM. With formate buffer pH 3.75 as sample and acceptor, the impact of χ in the range 0.01-10 was studied without bias from differences in pH. Here model analytes were unaffected by ion balance. Buffers containing propionic, butyric, and valeric acid were also tested. These buffer ions migrated more into the SLM, and affected recoveries in several cases. However, this was due to ion pairing rather than effects of ion balance. Similar behaviors from sodium chloride and urine samples were observed with different χ-values. Thus, in the systems tested, almost no impact of ion balance was found, and this was attributed to very low partition of background buffer and matrix ions into the SLM. On the other hand, extractions were in several cases influenced by ion pairing phenomena.
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Electromembrane Extraction of Highly Polar Compounds: Analysis of Cardiovascular Biomarkers in Plasma. Metabolites 2019; 10:metabo10010004. [PMID: 31861366 PMCID: PMC7022788 DOI: 10.3390/metabo10010004] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 12/05/2019] [Accepted: 12/11/2019] [Indexed: 12/12/2022] Open
Abstract
Cardiovascular diseases (CVDs) represent a major concern in today’s society, with more than 17.5 million deaths reported annually worldwide. Recently, five metabolites related to the gut metabolism of phospholipids were identified as promising predictive biomarker candidates for CVD. Validation of those biomarker candidates is crucial for applications to the clinic, showing the need for high-throughput analysis of large numbers of samples. These five compounds, trimethylamine N-oxide (TMAO), choline, betaine, l-carnitine, and deoxy-l-carnitine (4-trimethylammoniobutanoic acid), are highly polar compounds and show poor retention on conventional reversed phase chromatography, which can lead to strong matrix effects when using mass spectrometry detection, especially when high-throughput analysis approaches are used with limited separation of analytes from interferences. In order to reduce the potential matrix effects, we propose a novel fast parallel electromembrane extraction (Pa-EME) method for the analysis of these metabolites in plasma samples. The evaluation of Pa-EME parameters was performed using multi segment injection–capillary electrophoresis–mass spectrometry (MSI-CE-MS). Recoveries up to 100% were achieved, with variability as low as 2%. Overall, this study highlights the necessity of protein precipitation prior to EME for the extraction of highly polar compounds. The developed Pa-EME method was evaluated in terms of concentration range and response function, as well as matrix effects using fast-LC-MS/MS. Finally, the developed workflow was compared to conventional sample pre-treatment, i.e., protein precipitation using methanol, and fast-LC-MS/MS. Data show very strong correlations between both workflows, highlighting the great potential of Pa-EME for high-throughput biological applications.
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Electromembrane extraction with solvent modification of the acceptor solution: improved mass transfer of drugs of abuse from human plasma. Bioanalysis 2019; 11:755-771. [DOI: 10.4155/bio-2018-0308] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Aim: Electromembrane extraction (EME) of 37 drugs of abuse with significant differences in terms of polarity (0.68 < log P < 4.3) and basicity (1.17 < pKa < 10.38) was investigated from human plasma. Materials & methods: EME was performed with 250 mM trifluoroacetic acid and DMSO (1:1 v/v) in the acceptor solution. Results & conclusion: The analytes were extracted efficiently with pure 2-nitrophenyloctyl ether as supported liquid membrane when the acceptor solution was modified with DMSO. Thus, using DMSO mixed with 250 mM trifluoroacetic acid (1:1, v/v) as acceptor solution, recoveries from 40 to 105% (relative standard deviation <20%) were obtained for 33 of the analytes under optimized conditions. EME followed by ultra-HPLC–MS/MS analysis was evaluated from human plasma, and the results were satisfactory.
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Drouin N, Kubáň P, Rudaz S, Pedersen-Bjergaard S, Schappler J. Electromembrane extraction: Overview of the last decade. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2018.10.024] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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22
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Lin B, Wan L, Sun X, Huang C, Pedersen-Bjergaard S, Shen X. Electromembrane extraction of high level substances: A novel approach for selective recovery of templates in molecular imprinting. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.09.056] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Tabani H, Nojavan S, Alexovič M, Sabo J. Recent developments in green membrane-based extraction techniques for pharmaceutical and biomedical analysis. J Pharm Biomed Anal 2018; 160:244-267. [DOI: 10.1016/j.jpba.2018.08.002] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 08/01/2018] [Accepted: 08/03/2018] [Indexed: 01/11/2023]
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Nys G, Fillet M. Microfluidics contribution to pharmaceutical sciences: From drug discovery to post marketing product management. J Pharm Biomed Anal 2018; 159:348-362. [DOI: 10.1016/j.jpba.2018.07.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 07/08/2018] [Accepted: 07/10/2018] [Indexed: 12/18/2022]
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Drouin N, Rudaz S, Schappler J. New supported liquid membrane for electromembrane extraction of polar basic endogenous metabolites. J Pharm Biomed Anal 2018; 159:53-59. [PMID: 29980019 DOI: 10.1016/j.jpba.2018.06.029] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/04/2018] [Accepted: 06/17/2018] [Indexed: 11/18/2022]
Abstract
Extraction of polar endogenous compounds remains an important issue in bioanalysis although different techniques have been evaluated. Among them, electromembrane extraction (EME) is a relevant approach but supported liquid membranes (SLMs) dedicated to polar molecules are still lacking. In this study 22 organic solvents were evaluated as SLMs on a set of 45 polar basic metabolites (log P from -5.7 to 1.5) from various biochemical families. To investigate a large variety of organic solvents, a parallel electromembrane extraction device was used and a constant current approach was applied to circumvent the heterogeneous conductivities of the different SLMs. Among the tested organic solvents, 2-nitrophenyl pentyl ether (NPPE) appeared the most efficient SLM with the extraction of a large variety of polar cationic metabolites, high extraction yields, and low extraction variabilities. The applied current and the composition of the acceptor and donor solutions were also evaluated and 300 μA per well and acetic acid 1% (v/v), both as acceptor and donor compartments, were the most efficient conditions. The new SLM and the optimized experimental parameters were successfully applied to the extraction of precipitated plasma samples. Although the extraction recovery decreased for most compounds in the biological matrix, process efficiency (PE) up to 90% and low extraction variability (RSD between 2 and 18%) were obtained for several very polar compounds such as choline or acetylcholine, emphasizing the potential of EME for polar compounds.
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Affiliation(s)
- Nicolas Drouin
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland
| | - Serge Rudaz
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland
| | - Julie Schappler
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland.
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Dvořák M, Seip KF, Pedersen-Bjergaard S, Kubáň P. Semi-automated set-up for exhaustive micro-electromembrane extractions of basic drugs from biological fluids. Anal Chim Acta 2018; 1005:34-42. [DOI: 10.1016/j.aca.2017.11.081] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 11/27/2017] [Accepted: 11/28/2017] [Indexed: 10/18/2022]
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Drouin N, Rudaz S, Schappler J. Sample preparation for polar metabolites in bioanalysis. Analyst 2018; 143:16-20. [DOI: 10.1039/c7an01333g] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Sample preparation is a primary step of any bioanalytical workflow, especially in metabolomics where maximum information has to be obtained without spoiling the analytical instrument. The sample extraction of polar metabolites is still challenging but strategies exist to enable the phase transfer of hydrophilic metabolites from the biological phase to a clean interference-free phase.
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Affiliation(s)
- Nicolas Drouin
- School of Pharmaceutical Sciences
- University of Geneva
- University of Lausanne
- 1211 Geneva 4
- Switzerland
| | - Serge Rudaz
- School of Pharmaceutical Sciences
- University of Geneva
- University of Lausanne
- 1211 Geneva 4
- Switzerland
| | - Julie Schappler
- School of Pharmaceutical Sciences
- University of Geneva
- University of Lausanne
- 1211 Geneva 4
- Switzerland
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Fuchs D, Hidalgo CR, Ramos Payán M, Petersen NJ, Jensen H, Kutter JP, Pedersen-Bjergaard S. Continuous electromembrane extraction coupled with mass spectrometry – Perspectives and challenges. Anal Chim Acta 2018; 999:27-36. [DOI: 10.1016/j.aca.2017.09.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 09/19/2017] [Accepted: 09/20/2017] [Indexed: 10/18/2022]
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Suh JH, Han SB, Wang Y. Development of an improved sample preparation platform for acidic endogenous hormones in plant tissues using electromembrane extraction. J Chromatogr A 2017; 1535:1-8. [PMID: 29306633 DOI: 10.1016/j.chroma.2017.12.068] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 12/18/2017] [Accepted: 12/29/2017] [Indexed: 11/26/2022]
Abstract
Despite their importance in pivotal signaling pathways due to trace quantities and complex matrices, the analysis of plant hormones is a challenge. Here, to improve this issue, we present an electromembrane extraction technology combined with liquid chromatography-tandem mass spectrometry for determination of acidic plant hormones including jasmonic acid, abscisic acid, salicylic acid, benzoic acid, gibberellic acid and gibberellin A4 in plant tissues. Factors influencing extraction efficiency, such as voltage, extraction time and stirring rate were optimized using a design of experiments. Analytical performance was evaluated in terms of specificity, linearity, limit of quantification, precision, accuracy, recovery and repeatability. The results showed good linearity (r2 > 0.995), precision and acceptable accuracy. The limit of quantification ranged from 0.1 to 10 ng mL-1, and the recoveries were 34.6-50.3%. The developed method was applied in citrus leaf samples, showing better clean-up efficiency, as well as higher sensitivity compared to a previous method using liquid-liquid extraction. Organic solvent consumption was minimized during the process, making it an appealing method. More noteworthy, electromembrane extraction has been scarcely applied to plant tissues, and this is the first time that major plant hormones were extracted using this technology, with high sensitivity and selectivity. Taken together, this work gives not only a novel sample preparation platform using an electric field for plant hormones, but also a good example of extracting complex plant tissues in a simple and effective way.
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Affiliation(s)
- Joon Hyuk Suh
- Department of Food Science and Human Nutrition, Citrus Research and Education Center, University of Florida, 700 Experiment Station Rd, Lake Alfred, FL 33850, USA
| | - Sang Beom Han
- Department of Pharmaceutical Analysis, College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Yu Wang
- Department of Food Science and Human Nutrition, Citrus Research and Education Center, University of Florida, 700 Experiment Station Rd, Lake Alfred, FL 33850, USA.
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Direct coupling of electromembrane extraction to mass spectrometry - Advancing the probe functionality toward measurements of zwitterionic drug metabolites. Anal Chim Acta 2017; 983:121-129. [DOI: 10.1016/j.aca.2017.05.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 05/26/2017] [Accepted: 05/31/2017] [Indexed: 11/23/2022]
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32
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Drouin N, Mandscheff JF, Rudaz S, Schappler J. Development of a New Extraction Device Based on Parallel-Electromembrane Extraction. Anal Chem 2017; 89:6346-6350. [DOI: 10.1021/acs.analchem.7b01284] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicolas Drouin
- School
of Pharmaceutical Sciences, University of Geneva, University of Lausanne, 1 Rue Michel-Servet 1211 Geneva 4, Switzerland
| | | | - Serge Rudaz
- School
of Pharmaceutical Sciences, University of Geneva, University of Lausanne, 1 Rue Michel-Servet 1211 Geneva 4, Switzerland
| | - Julie Schappler
- School
of Pharmaceutical Sciences, University of Geneva, University of Lausanne, 1 Rue Michel-Servet 1211 Geneva 4, Switzerland
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Pedersen-Bjergaard S, Huang C, Gjelstad A. Electromembrane extraction-Recent trends and where to go. J Pharm Anal 2017; 7:141-147. [PMID: 29404030 PMCID: PMC5790682 DOI: 10.1016/j.jpha.2017.04.002] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 04/06/2017] [Accepted: 04/10/2017] [Indexed: 11/28/2022] Open
Abstract
Electromembrane extraction (EME) is an analytical microextraction technique, where charged analytes (such as drug substances) are extracted from an aqueous sample (such as a biological fluid), through a supported liquid membrane (SLM) comprising a water immiscible organic solvent, and into an aqueous acceptor solution. The driving force for the extraction is an electrical potential (dc) applied across the SLM. In this paper, EME is reviewed. First, the principle for EME is explained with focus on extraction of cationic and anionic analytes, and typical performance data are presented. Second, papers published in 2016 are reviewed and discussed with focus on (a) new SLMs, (b) new support materials for the SLM, (c) new sample additives improving extraction, (d) new technical configurations, (e) improved theoretical understanding, and (f) pharmaceutical new applications. Finally, important future research objectives and directions are defined for further development of EME, with the aim of establishing EME in the toolbox of future analytical laboratories.
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Affiliation(s)
- Stig Pedersen-Bjergaard
- School of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway.,Faculty of Health and Medical Sciences, School of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Chuixiu Huang
- School of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway
| | - Astrid Gjelstad
- School of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway
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34
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New nanostructured support for carrier-mediated electromembrane extraction of high polar compounds. Talanta 2017; 162:32-37. [DOI: 10.1016/j.talanta.2016.10.022] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/23/2016] [Accepted: 10/02/2016] [Indexed: 11/22/2022]
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35
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Ramautar R, Somsen GW, de Jong GJ. CE-MS for metabolomics: Developments and applications in the period 2014-2016. Electrophoresis 2016; 38:190-202. [PMID: 27718257 PMCID: PMC5248609 DOI: 10.1002/elps.201600370] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 09/25/2016] [Accepted: 09/26/2016] [Indexed: 12/11/2022]
Abstract
CE–MS can be considered a useful analytical technique for the global profiling of (highly) polar and charged metabolites in various samples. Over the past few years, significant advancements have been made in CE–MS approaches for metabolomics studies. In this paper, which is a follow‐up of a previous review paper covering the years 2012–2014 (Electrophoresis 2015, 36, 212–224), recent CE–MS strategies developed for metabolomics covering the literature from July 2014 to June 2016 are outlined. Attention will be paid to new CE–MS approaches for the profiling of anionic metabolites and the potential of SPE coupled to CE–MS is also demonstrated. Representative examples illustrate the applicability of CE–MS in the fields of biomedical, clinical, microbial, plant, and food metabolomics. A complete overview of recent CE–MS‐based metabolomics studies is given in a table, which provides information on sample type and pretreatment, capillary coatings, and MS detection mode. Finally, general conclusions and perspectives are given.
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Affiliation(s)
- Rawi Ramautar
- Division of Analytical Biosciences, LACDR, Leiden University, Leiden, The Netherlands
| | - Govert W Somsen
- Division of BioAnalytical Chemistry, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Gerhardus J de Jong
- Biomolecular Analysis, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
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Fuchs D, Pedersen-Bjergaard S, Jensen H, Rand KD, Honoré Hansen S, Petersen NJ. Fully Automated Electro Membrane Extraction Autosampler for LC–MS Systems Allowing Soft Extractions for High-Throughput Applications. Anal Chem 2016; 88:6797-804. [DOI: 10.1021/acs.analchem.6b01243] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- David Fuchs
- Department
of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Stig Pedersen-Bjergaard
- Department
of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
- School
of Pharmacy, University of Oslo, P.O. Box 1068 Blindern, 0316 Oslo, Norway
| | - Henrik Jensen
- Department
of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Kasper D. Rand
- Department
of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Steen Honoré Hansen
- Department
of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Nickolaj Jacob Petersen
- Department
of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
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37
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Asadi S, Tabani H, Khodaei K, Asadian F, Nojavan S. Rotating electrode in electro membrane extraction: a new and efficient methodology to increase analyte mass transfer. RSC Adv 2016. [DOI: 10.1039/c6ra21762a] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Rotating electrode electromembrane extraction (REEME) as a new EME approach was introduced for the extraction of basic drugs from different matrices.
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Affiliation(s)
- Sakine Asadi
- Department of Pure Chemistry
- Faculty of Chemistry
- Shahid Beheshti University
- Tehran
- Iran
| | - Hadi Tabani
- Department of Environmental Geology
- Research Institute of Applied Sciences (ACECR)
- Shahid Beheshti University
- Tehran
- Iran
| | - Kamal Khodaei
- Department of Environmental Geology
- Research Institute of Applied Sciences (ACECR)
- Shahid Beheshti University
- Tehran
- Iran
| | - Farhad Asadian
- Department of Environmental Geology
- Research Institute of Applied Sciences (ACECR)
- Shahid Beheshti University
- Tehran
- Iran
| | - Saeed Nojavan
- Department of Pure Chemistry
- Faculty of Chemistry
- Shahid Beheshti University
- Tehran
- Iran
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