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Shang Q, Mei H, Feng X, Huang C, Pedersen-Bjergaard S, Shen X. Ultrasound-assisted electromembrane extraction with supported semi-liquid membrane. Anal Chim Acta 2021; 1184:339038. [PMID: 34625271 DOI: 10.1016/j.aca.2021.339038] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 08/28/2021] [Accepted: 09/04/2021] [Indexed: 10/20/2022]
Abstract
Electromembrane extraction (EME), involving the migration of charged analytes across a supported liquid membrane (SLM) with an external power supply, is a promising sample preparation method in analytical chemistry. However, the presence of boundary double layers at the SLM/solution interfaces often restricts extraction efficiency. To avoid this, the current work proposed an ultrasound-assisted EME (UA-EME) method based on a novel type of supported semi-liquid membrane (SsLM). The characterizations showed that the SsLM was stable under ultrasound conditions. Ultrasound was found to reduce the boundary double layers and thus increase the mass transfer. Major operational parameters in UA-EME including ultrasound power density, temperature, applied voltage and extraction time were optimized with haloperidol, fluoxetine, and sertraline as model analytes. Under the optimal conditions, extraction recoveries of model analytes in water samples were in the range of 66.8%-91.6%. When this UA-EME method was coupled with LC-MS/MS for detection of the target analytes in human urine samples, the linear range of the analytical method was 10-1000 ng mL-1, with R2 > 0.997 for all analytes. The limits of detection (LOD) and limits of quantification (LOQ) were in the range of 1.7-2.1 ng mL-1 and 5.7-6.7 ng mL-1, respectively. The UA-EME expands the application field of ultrasound chemistry and will be very important in development of stable and fast sample preparation systems in the future.
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Affiliation(s)
- Qianqian Shang
- State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment and Health, Ministry of Education, Key Laboratory of Environment and Health (Wuhan), Ministry of Environmental Protection, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Hangkong Road #13, Wuhan, Hubei 430030, China
| | - Hang Mei
- State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment and Health, Ministry of Education, Key Laboratory of Environment and Health (Wuhan), Ministry of Environmental Protection, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Hangkong Road #13, Wuhan, Hubei 430030, China
| | - Xinrui Feng
- State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment and Health, Ministry of Education, Key Laboratory of Environment and Health (Wuhan), Ministry of Environmental Protection, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Hangkong Road #13, Wuhan, Hubei 430030, China
| | - Chuixiu Huang
- Department of Forensic Medicine, Huazhong University of Science and Technology, Hangkong Road #13, Wuhan, Hubei 430030, China.
| | - 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, DK-2100 Copenhagen, Denmark
| | - Xiantao Shen
- State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment and Health, Ministry of Education, Key Laboratory of Environment and Health (Wuhan), Ministry of Environmental Protection, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Hangkong Road #13, Wuhan, Hubei 430030, China.
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Abstract
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In
this paper, we report the first example of employing a sacrificial
electrode in the acceptor solution during electromembrane extraction
(EME). The electrode was based on a silver wire with a layer of silver
chloride electroplated onto the surface. During EME, the electrode
effectively inhibited electrolysis of water in the acceptor compartment,
by accepting the charge transfer across the SLM, which enabled the
application of 500 μA current without suffering gas formation
or pH changes from electrolysis of water. The electroplating strategy
was optimized with a design-of-experiments (DOE) methodology that
provided optimal conditions of electroplating. With an optimized electrode,
1 cm of the electrode in contact with the acceptor solution inhibited
electrolysis of water for approximately 30 min at 500 μA current
(redox capacity). Further, the redox capacity of the electrode was
found to increase through multiple uses. The advantage of the electrode
was demonstrated by extracting polar analytes at high-current conditions
in a standard EME system comprising 2-nitrophenyl octyl ether (NPOE)
as SLM and 10 mM HCl as sample/acceptor solutions. Application of
high current enabled significantly higher recoveries than could otherwise
be obtained at 100 μA. Sacrificial electrodes were also tested
in μ-EME and were found beneficial by eliminating detrimental
bubble formation. Thus, the sacrificial electrodes improved the stability
of μ-EME systems. The findings of this paper are important for
development of stable and robust systems for EME operated at high
voltage/current and for EME performed in narrow channels/tubing where
bubble formation is critical.
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Affiliation(s)
- Frederik A Hansen
- Department 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
| | - 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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Šlampová A, Kubáň P. Direct Analysis of Free Aqueous and Organic Operational Solutions as a Tool for Understanding Fundamental Principles of Electromembrane Extraction. Anal Chem 2017; 89:12960-12967. [DOI: 10.1021/acs.analchem.7b03829] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrea Šlampová
- Institute of Analytical Chemistry of the Czech Academy of Sciences v.v.i., Veveří 97, CZ-60200 Brno, Czech Republic
| | - Pavel Kubáň
- Institute of Analytical Chemistry of the Czech Academy of Sciences v.v.i., Veveří 97, CZ-60200 Brno, Czech Republic
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Restan MS, Jensen H, Shen X, Huang C, Martinsen ØG, Kubáň P, Gjelstad A, Pedersen-Bjergaard S. Comprehensive study of buffer systems and local pH effects in electromembrane extraction. Anal Chim Acta 2017; 984:116-123. [DOI: 10.1016/j.aca.2017.06.049] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 06/26/2017] [Accepted: 06/28/2017] [Indexed: 11/28/2022]
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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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