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Sohrabi Y, Rahimian F, Yousefinejad S, Aliasghari F, Soleimani E. Microextraction techniques for occupational biological monitoring: Basic principles, current applications and future perspectives. Biomed Chromatogr 2024; 38:e5883. [PMID: 38712625 DOI: 10.1002/bmc.5883] [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: 10/25/2023] [Revised: 03/01/2024] [Accepted: 04/01/2024] [Indexed: 05/08/2024]
Abstract
The application of green microextraction techniques (METs) is constantly being developed in different areas including pharmaceutical, forensic, food and environmental analysis. However, they are less used in biological monitoring of workers in occupational settings. Developing valid extraction methods and analytical techniques for the determination of occupational indicators plays a critical role in the management of workers' exposure to chemicals in workplaces. Microextraction techniques have become increasingly important because they are inexpensive, robust and environmentally friendly. This study aimed to provide a comprehensive review and interpret the applications of METs and novel sorbents and liquids in biological monitoring. Future perspectives and occupational indicators that METs have not yet been developed for are also discussed.
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Affiliation(s)
- Younes Sohrabi
- Department of Occupational Health and Safety Engineering, Shoushtar Faculty of Medical Sciences, Shoushtar, Iran
| | - Fatemeh Rahimian
- Department of Occupational Health and Safety Engineering, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Saeed Yousefinejad
- Department of Occupational Health and Safety Engineering, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Fereshteh Aliasghari
- Department of Clinical Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Esmaeel Soleimani
- Department of Occupational Health and Safety Engineering, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
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Gurrani S, Prakasham K, Huang PC, Wu MT, Wu CF, Lin YC, Tsai B, Krishnan A, Tsai PC, Ponnusamy VK. Simultaneous biomonitoring of volatile organic compounds' metabolites in human urine samples using a novel in-syringe based fast urinary metabolites extraction (FaUMEx) technique coupled with UHPLC-MS/MS analysis. CHEMOSPHERE 2023; 329:138667. [PMID: 37059207 DOI: 10.1016/j.chemosphere.2023.138667] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 03/31/2023] [Accepted: 04/10/2023] [Indexed: 05/03/2023]
Abstract
Assessing the impact of human exposure to environmental toxicants is often crucial to biomonitoring the exposed dose. In this work, we report a novel fast urinary metabolites extraction (FaUMEx) technique coupled with UHPLC-MS/MS analysis for the highly sensitive and simultaneous biomonitoring of the five major urinary metabolites (thiodiglycolic acid, s-phenylmercapturic acid, t,t-muconic acid, mandelic acid, and phenyl glyoxylic acid) of common volatile organic compounds' (VOCs) exposure (vinyl chloride, benzene, styrene, and ethylbenzene) in human. FaUMEx technique comprises of two-steps, liquid-liquid microextraction was performed first in an extraction syringe using 1 mL of methanol (pH 3) as an extraction solvent and then, the extractant was passed through a clean-up syringe (pre-packed-with various sorbents including 500 mg anhydrous MgSO4, 50 mg C18, and 50 mg SiO2) to obtain the high order of matrice clean-up and preconcentration efficiency. The developed method displayed excellent linearity, and the correlation coefficients were >0.998 for all the target metabolites with detection and quantification limits of 0.02-0.24 ng mL-1 and 0.05-0.72 ng mL-1, respectively. Furthermore, the matrix effects were < ±5%, and inter and intra-day precision were <9%. Moreover, the presented method was applied and validated to real sample analysis for biomonitoring of VOC's exposure levels. The results showed that the developed FaUMEx-UHPLC-MS/MS method is fast, simple, low-cost, low-solvent consumption, high sensitivity with good accuracy and precision for five targeted urinary VOCs' metabolites. Therefore, the presented dual-syringe mode FaUMEx strategy with UHPLC-MS/MS technique can be applied to biomonitoring of various urinary metabolites to assess human exposure to environmental toxicants.
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Affiliation(s)
- Swapnil Gurrani
- PhD Program in Environmental and Occupational Medicine, College of Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan
| | - Karthikeyan Prakasham
- PhD Program in Environmental and Occupational Medicine, College of Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan
| | - Po-Chin Huang
- National Institute of Environmental Health Sciences, National Health Research Institutes (NHRI), Miaoli County, 35053, Taiwan; Department of Medical Research, China Medical University Hospital, China Medical University, Taichung City, Taiwan; Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan
| | - Ming-Tsang Wu
- Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Department of Public Health, Kaohsiung Medical University, Kaohsiung City, Taiwan
| | - Chia-Fang Wu
- Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; International Master Program of Translational Medicine, College of Engineering and Science, National United University, Miaoli, Taiwan
| | - Yu-Chia Lin
- Research and Development Division, Great Engineering Technology (GETECH) Corporation, No.392, Yucheng Rd., Zuoying District., Kaohsiung City, 813, Taiwan
| | - Bongee Tsai
- Research and Development Division, Great Engineering Technology (GETECH) Corporation, No.392, Yucheng Rd., Zuoying District., Kaohsiung City, 813, Taiwan
| | - Anbarasu Krishnan
- Department of Computational Biology, Institute of Bioinformatics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, 602105, India
| | - Pei-Chien Tsai
- Department of Computational Biology, Institute of Bioinformatics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, 602105, India; Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan
| | - Vinoth Kumar Ponnusamy
- PhD Program in Environmental and Occupational Medicine, College of Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Department of Medical Research, Kaohsiung Medical University Hospital (KMUH), Kaohsiung City, 807, Taiwan.
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Huang X, Li Z, Zhang T, Zhu J, Wang X, Nie M, Harada K, Zhang J, Zou X. Research progress in human biological monitoring of aromatic hydrocarbon with emphasis on the analytical technology of biomarkers. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 257:114917. [PMID: 37094484 DOI: 10.1016/j.ecoenv.2023.114917] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/11/2023] [Accepted: 04/13/2023] [Indexed: 05/03/2023]
Abstract
Aromatic hydrocarbons are unsaturated compounds containing carbon and hydrogen that form single aromatic ring, or double, triple, or multiple fused rings. This review focuses on the research progress of aromatic hydrocarbons represented by polycyclic aromatic hydrocarbons (including halogenated polycyclic aromatic hydrocarbons), benzene and its derivatives including toluene, ethylbenzene, xylenes (o-, m- and p-), styrene, nitrobenzene, and aniline. Due to the toxicity, widespread coexistence, and persistence of aromatic hydrocarbons in the environment, accurate assessment of exposure to aromatic hydrocarbons is essential to protect human health. The effects of aromatic hydrocarbons on human health are mainly derived from three aspects: different routes of exposure, the duration and relative toxicity of aromatic hydrocarbons, and the concentration of aromatic hydrocarbons which should be below the biological exposure limit. Therefore, this review discusses the primary exposure routes, toxic effects on humans, and key populations, in particular. This review briefly summarizes the different biomarker indicators of main aromatic hydrocarbons in urine, since most aromatic hydrocarbon metabolites are excreted via urine, which is more feasible, convenient, and non-invasive. In this review, the pretreatment and analytical techniques are compiled systematically for the qualitative and quantitative assessments of aromatic hydrocarbons metabolites such as gas chromatography and high-performance liquid chromatography with multiple detectors. This review aims to identify and monitor the co-exposure of aromatic hydrocarbons that provides a basis for the formulation of corresponding health risk control measures and guide the adjustment of the exposure dose of pollutants to the population.
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Affiliation(s)
- Xinyi Huang
- Department of Public Health Laboratory Science, West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, Sichuan University, Chengdu 610041, China
| | - Zhuoya Li
- Department of Public Health Laboratory Science, West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, Sichuan University, Chengdu 610041, China
| | - Tianai Zhang
- Department of Public Health Laboratory Science, West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, Sichuan University, Chengdu 610041, China
| | - Jing Zhu
- Department of Public Health Laboratory Science, West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, Sichuan University, Chengdu 610041, China
| | - Xuan Wang
- Department of Public Health Laboratory Science, West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, Sichuan University, Chengdu 610041, China
| | - Manqing Nie
- Department of Public Health Laboratory Science, West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, Sichuan University, Chengdu 610041, China
| | - Kouji Harada
- Department of Health and Environmental Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Jing Zhang
- Department of Public Health Laboratory Science, West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, Sichuan University, Chengdu 610041, China.
| | - Xiaoli Zou
- Department of Public Health Laboratory Science, West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, Sichuan University, Chengdu 610041, China.
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Application of Fe3O4@TbBd nanobeads in Microextraction by Packed Sorbent (MEPS) for determination of BTEXs biomarkers by HPLC–UV in urine samples. J Chromatogr B Analyt Technol Biomed Life Sci 2022; 1197:123197. [DOI: 10.1016/j.jchromb.2022.123197] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 01/29/2022] [Accepted: 02/23/2022] [Indexed: 11/23/2022]
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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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Bahrami M, Pirmohammadi Z, Bahrami A. A review of new adsorbents for separation of BTEX biomarkers. Biomed Chromatogr 2021; 35:e5131. [PMID: 33788293 DOI: 10.1002/bmc.5131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 03/17/2021] [Accepted: 03/26/2021] [Indexed: 01/09/2023]
Abstract
The biomarker analysis of benzene, toluene, ethylbenzene and xylene (BTEXs) in biological samples is the primary technique for evaluating these compounds in occupational and environmental exposures. The BTEX biomarkers are widely used to study the BTEX distribution in the environment and workplaces. Liquid-liquid extraction and solid-phase liquid extraction are among the most commonly used conventional methods to analyze biological indices of BTEXs. New methods have been proposed to analyze BTEX biomarkers using novel adsorbents such as sol-gel composite nanotubes, molecularly imprinted polymers and metal-organic frameworks, which are based on the application of needle trap devices, microextraction by packed sorbent, and solid-phase microextraction techniques. This paper provides an overview of new methods since 2015 regarding applying microextraction methods based on new adsorbents and analyzing BTEX biomarker compounds for occupational and environmental exposures. The results were compared with the liquid-phase microextraction methods recommended for urinary BTEX biomarkers.
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Affiliation(s)
- Mohammadreza Bahrami
- Department of Health, Safety and Environment, School of Environment, College of Engineering, University of Tehran, Kish, Iran
| | - Zahra Pirmohammadi
- Center of Excellence for Occupational Health, Occupational Health and Safety Research Center, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Abdulrahman Bahrami
- Center of Excellence for Occupational Health, Occupational Health and Safety Research Center, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
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Wu S, Zhu M, Zhang Y, Kosinova M, Fedin VP, Gao E. Luminescent sensors based on coordination polymers with adjustable emissions for detecting biomarker of pollutant ethylbenzene and styrene. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.6058] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Shuangyan Wu
- The Key Laboratory of the Inorganic Molecule‐Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry Shenyang University of Chemical Technology 11th Street, Shenyang Economic and Technological Development Zone Shenyang Liaoning 110142 China
| | - Mingchang Zhu
- The Key Laboratory of the Inorganic Molecule‐Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry Shenyang University of Chemical Technology 11th Street, Shenyang Economic and Technological Development Zone Shenyang Liaoning 110142 China
| | - Ying Zhang
- The Key Laboratory of the Inorganic Molecule‐Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry Shenyang University of Chemical Technology 11th Street, Shenyang Economic and Technological Development Zone Shenyang Liaoning 110142 China
| | - Marina Kosinova
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of the Russian Academy of Sciences 3, Acad. Lavrentiev Ave. Novosibirsk 630090 Russian Federation
| | - Vladimir P. Fedin
- Nikolaev Institute of Inorganic Chemistry Siberian Branch of the Russian Academy of Sciences 3, Acad. Lavrentiev Ave. Novosibirsk 630090 Russian Federation
| | - Enjun Gao
- School of Chemical Engineering University of Science and Technology Liaoning Anshan Liaoning 114051 China
- The Key Laboratory of the Inorganic Molecule‐Based Chemistry of Liaoning Province and Laboratory of Coordination Chemistry Shenyang University of Chemical Technology 11th Street, Shenyang Economic and Technological Development Zone Shenyang Liaoning 110142 China
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A novel diagnostic in situ derivatization kit for the simultaneous determination of 14 biomarkers of exposure to benzene, toluene, ethyl benzene and xylenes in human urine by isotope dilution liquid chromatography tandem mass spectrometry and kit optimization using response surface methodology. Anal Chim Acta 2018; 1036:195-203. [DOI: 10.1016/j.aca.2018.06.064] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 05/28/2018] [Accepted: 06/24/2018] [Indexed: 12/17/2022]
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Fakhari AR, Mohammadi Kosalar H, Asadi S, Hasheminasab KS. Surfactant-assisted electromembrane extraction combined with cyclodextrin-modified capillary electrophoresis for the separation and quantification of Tranylcypromine enantiomers in biological samples. J Sep Sci 2018; 41:475-482. [DOI: 10.1002/jssc.201700488] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 09/22/2017] [Accepted: 09/23/2017] [Indexed: 11/06/2022]
Affiliation(s)
| | | | - Sajad Asadi
- Faculty of Chemistry; Shahid Beheshti University; Tehran Iran
| | - Kobra Sadat Hasheminasab
- Faculty of Chemistry; Shahid Beheshti University; Tehran Iran
- Soil and Water Research Institute; Agricultural Research, Education and Extension Organization (AREEO); Karaj Iran
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Oliveira AM, Loureiro HC, de Jesus FFS, de Jesus DP. Electromembrane extraction and preconcentration of carbendazim and thiabendazole in water samples before capillary electrophoresis analysis. J Sep Sci 2017; 40:1532-1539. [DOI: 10.1002/jssc.201601305] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 01/18/2017] [Accepted: 01/19/2017] [Indexed: 11/12/2022]
Affiliation(s)
| | | | | | - Dosil Pereira de Jesus
- Institute of Chemistry, University of Campinas; UNICAMP; Campinas, SP Brazil
- Instituto Nacional de Ciência e Tecnologia de Bioanalítica; Campinas, SP Brazil
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Filho CMC, Neto MNL, Teixeira RS, Pais AACC, Valente AJM. Development and optimization of an HPLC–DAD method for quantification of six petroleum hydrocarbon compounds in aqueous samples. J LIQ CHROMATOGR R T 2017. [DOI: 10.1080/10826076.2016.1274998] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | - Manoel N. L. Neto
- Department of Chemistry, Federal University of Ceará, Campus do Pici, Fortaleza, CE, Brazil
| | - Raquel S. Teixeira
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Coimbra, Coimbra, Portugal
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Gomes RDP, Pena CB, Rezende J, Coutrim MX, Afonso RJDCF. Validation of a new high-throughput method to determine urinaryS-phenylmercapturic acid using low-temperature partitioning extraction and ultra high performance liquid chromatography-mass spectrometry. J Sep Sci 2016; 40:550-557. [DOI: 10.1002/jssc.201600540] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 10/24/2016] [Accepted: 11/06/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Rafaela de Paiva Gomes
- Department of Chemistry; Institute of Exact and Biological Sciences; Federal University of Ouro Preto; Ouro Preto MG Brazil
| | - Camila Bárbara Pena
- Department of Chemistry; Institute of Exact and Biological Sciences; Federal University of Ouro Preto; Ouro Preto MG Brazil
| | - Jennifer Rezende
- Department of Chemistry; Institute of Exact and Biological Sciences; Federal University of Ouro Preto; Ouro Preto MG Brazil
| | - Mauricio Xavier Coutrim
- Department of Chemistry; Institute of Exact and Biological Sciences; Federal University of Ouro Preto; Ouro Preto MG Brazil
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Vitali L, Gonçalves S, Rodrigues V, Fávere VT, Micke GA. Development of a fast method for simultaneous determination of hippuric acid, mandelic acid, and creatinine in urine by capillary zone electrophoresis using polymer multilayer-coated capillary. Anal Bioanal Chem 2016; 409:1943-1950. [DOI: 10.1007/s00216-016-0142-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 11/28/2016] [Accepted: 12/09/2016] [Indexed: 10/20/2022]
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Oedit A, Ramautar R, Hankemeier T, Lindenburg PW. Electroextraction and electromembrane extraction: Advances in hyphenation to analytical techniques. Electrophoresis 2016; 37:1170-86. [PMID: 26864699 PMCID: PMC5071742 DOI: 10.1002/elps.201500530] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 01/06/2016] [Accepted: 01/31/2016] [Indexed: 12/16/2022]
Abstract
Electroextraction (EE) and electromembrane extraction (EME) are sample preparation techniques that both require an electric field that is applied over a liquid-liquid system, which enables the migration of charged analytes. Furthermore, both techniques are often used to pre-concentrate analytes prior to analysis. In this review an overview is provided of the body of literature spanning April 2012-November 2015 concerning EE and EME, focused on hyphenation to analytical techniques. First, the theoretical aspects of concentration enhancement in EE and EME are discussed to explain extraction recovery and enrichment factor. Next, overviews are provided of the techniques based on their hyphenation to LC, GC, CE, and direct detection. These overviews cover the compounds and matrices, experimental aspects (i.e. donor volume, acceptor volume, extraction time, extraction voltage, and separation time) and the analytical aspects (i.e. limit of detection, enrichment factor, and extraction recovery). Techniques that were either hyphenated online to analytical techniques or show high potential with respect to online hyphenation are highlighted. Finally, the potential future directions of EE and EME are discussed.
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Affiliation(s)
- Amar Oedit
- Division of Analytical Biosciences, Leiden Academic Center for Drug Research, Leiden University, Leiden, the Netherlands
| | - Rawi Ramautar
- Division of Analytical Biosciences, Leiden Academic Center for Drug Research, Leiden University, Leiden, the Netherlands
| | - Thomas Hankemeier
- Division of Analytical Biosciences, Leiden Academic Center for Drug Research, Leiden University, Leiden, the Netherlands
| | - Petrus W Lindenburg
- Division of Analytical Biosciences, Leiden Academic Center for Drug Research, Leiden University, Leiden, the Netherlands
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