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Haehnel V, Khan FZ, Mutschke G, Cierpka C, Uhlemann M, Fritsch I. Combining magnetic forces for contactless manipulation of fluids in microelectrode-microfluidic systems. Sci Rep 2019; 9:5103. [PMID: 30911104 PMCID: PMC6433926 DOI: 10.1038/s41598-019-41284-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 03/01/2019] [Indexed: 11/09/2022] Open
Abstract
A novel method to drive and manipulate fluid in a contactless way in a microelectrode-microfluidic system is demonstrated by combining the Lorentz and magnetic field gradient forces. The method is based on the redox-reaction [Fe(CN)6]3-/[Fe(CN)6]4- performed in a magnetic field oriented perpendicular to the ionic current that crosses the gap between two arrays of oppositely polarized microelectrodes, generating a magnetohydrodynamic flow. Additionally, a movable magnetized CoFe micro-strip is placed at different positions beneath the gap. In this region, the magnetic flux density is changed locally and a strong magnetic field gradient is formed. The redox-reaction changes the magnetic susceptibility of the electrolyte near the electrodes, and the resulting magnetic field gradient exerts a force on the fluid, which leads to a deflection of the Lorentz force-driven main flow. Particle Image Velocity measurements and numerical simulations demonstrate that by combining the two magnetic forces, the flow is not only redirected, but also a local change of concentration of paramagnetic species is realized.
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Affiliation(s)
- Veronika Haehnel
- Institute for Complex Materials, IFW Dresden, Helmholtzstr. 20, D-01069, Dresden, Germany
| | - Foysal Z Khan
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, 72701, USA
| | - Gerd Mutschke
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, D-01328, Dresden, Germany
| | - Christian Cierpka
- Institute of Thermodynamics and Fluid Mechanics,Technische Universität Ilmenau, D-98684, Ilmenau, Germany
| | - Margitta Uhlemann
- Institute for Complex Materials, IFW Dresden, Helmholtzstr. 20, D-01069, Dresden, Germany.
| | - Ingrid Fritsch
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, 72701, USA
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Biological substrates: Green alternatives in trace elemental preconcentration and speciation analysis. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2016.04.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Liu L, Li T, Wu M, Yu H. Determination of Manganese(II) with Preconcentration on Almond Skin and Determination by Flame Atomic Absorption Spectrometry. ANAL LETT 2016. [DOI: 10.1080/00032719.2016.1173048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ali K, Iqbal M, Korthout HAAJ, Maltese F, Fortes AM, Pais MS, Verpoorte R, Choi YH. NMR spectroscopy and chemometrics as a tool for anti-TNFα activity screening in crude extracts of grapes and other berries. Metabolomics 2012; 8:1148-1161. [PMID: 23136560 PMCID: PMC3483097 DOI: 10.1007/s11306-012-0406-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2011] [Accepted: 02/01/2012] [Indexed: 02/02/2023]
Abstract
The identification of active ingredients in crude plant extracts offers great advantages. In this study, nuclear magnetic resonance and chemometrics were used for the screening of in vitro anti-TNFα activity in different berry types. Solid phase extraction was applied and the resulting water, methanol-water (1:1), and methanol fractions were tested for the activity. The methanol-water fraction contained most of the phenolics and showed significantly higher activity than the other two fractions. In the second phase of this study, grapes from 'Trincadeira', 'Touriga Nacional', and 'Aragonês', at four developmental stages were metabolically classified and tested for the TNFα inhibition. The initial stages of grape development, green and veraison, were found more active against TNFα production as compared to the later ripe and harvest stages. Among the cultivars, 'Touriga Nacional' was found to be the most potent inhibitor. Different multivariate data analyses algorithms based on projections to latent structures were applied to correlate the NMR and TNFα inhibition data. The variable importance in the projections plot showed that phenolics like quercetin, myricetin, (+)-catechin, (-)-epicatechin, caftarate, and coutarate, were positively correlated with high activity. This work demonstrates the great potential of NMR spectroscopy in combination with chemometrics for the screening of large set of crude extracts, to study the effects of different variables on the activity, and identifying active compounds in complex mixtures like plant extracts. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11306-012-0406-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kashif Ali
- Natural Products Laboratory, Institute of Biology, Leiden University, 2300 RA Leiden, The Netherlands
| | - Muzamal Iqbal
- Natural Products Laboratory, Institute of Biology, Leiden University, 2300 RA Leiden, The Netherlands
| | | | - Federica Maltese
- Natural Products Laboratory, Institute of Biology, Leiden University, 2300 RA Leiden, The Netherlands
| | - Ana Margarida Fortes
- Plant Systems Biology Lab, ICAT, Center for Biodiversity, Functional and Integrative Genomics, FCUL, 1749-016 Lisbon, Portugal
| | - Maria Salomé Pais
- Plant Systems Biology Lab, ICAT, Center for Biodiversity, Functional and Integrative Genomics, FCUL, 1749-016 Lisbon, Portugal
| | - Robert Verpoorte
- Natural Products Laboratory, Institute of Biology, Leiden University, 2300 RA Leiden, The Netherlands
| | - Young Hae Choi
- Natural Products Laboratory, Institute of Biology, Leiden University, 2300 RA Leiden, The Netherlands
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Sun J, Yi CL, Zhao RS, Wang X, Jiang WQ, Wang XK. Determination of trace triclosan in environmental water by microporous bamboo-activated charcoal solid-phase extraction combined with HPLC-ESI-MS. J Sep Sci 2012; 35:2781-6. [DOI: 10.1002/jssc.201200328] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Revised: 06/18/2012] [Accepted: 06/24/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Jing Sun
- School of Light Chemistry and Environmental Engineering; Shandong Polytechnic University; Jinan China
| | - Chun-Liang Yi
- School of Resources and Environment; University of jinan; Jinan China
| | - Ru-Song Zhao
- Analysis and Test Center; Shandong Academy of Sciences; Jinan China
| | - Xia Wang
- Analysis and Test Center; Shandong Academy of Sciences; Jinan China
| | - Wen-Qiang Jiang
- School of Light Chemistry and Environmental Engineering; Shandong Polytechnic University; Jinan China
- Shandong Key Laboratory of Cleaner Production and Reuse of Industrial Waste; Jinan China
| | - Xi-Kui Wang
- School of Light Chemistry and Environmental Engineering; Shandong Polytechnic University; Jinan China
- Shandong Key Laboratory of Cleaner Production and Reuse of Industrial Waste; Jinan China
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Pre-analytical method for NMR-based grape metabolic fingerprinting and chemometrics. Anal Chim Acta 2011; 703:179-86. [DOI: 10.1016/j.aca.2011.07.036] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 07/08/2011] [Accepted: 07/21/2011] [Indexed: 11/22/2022]
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Pacheco PH, Gil RA, Cerutti SE, Smichowski P, Martinez LD. Biosorption: a new rise for elemental solid phase extraction methods. Talanta 2011; 85:2290-300. [PMID: 21962645 DOI: 10.1016/j.talanta.2011.08.043] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 08/19/2011] [Accepted: 08/23/2011] [Indexed: 10/17/2022]
Abstract
Biosorption is a term that usually describes the removal of heavy metals from an aqueous solution through their passive binding to a biomass. Bacteria, yeast, algae and fungi are microorganisms that have been immobilized and employed as sorbents in biosorption processes. The binding characteristics of microorganisms are attributed to functional groups on the surface providing some features to the biosorption process like selectivity, specificity and easy release. These characteristics turn the biosorption into an ideal process to be introduced in solid phase extraction systems for analytical approaches. This review encompasses the research carried out since 2000, focused on the employment of biosorption processes as an analytical tool to improve instrumental analysis. Since aminoacids and peptides as synthetic analogues of natural metallothioneins, proteins present in the cell wall of microorganisms, have been also immobilized on solid supports (controlled pore glass, carbon nanotubes, silica gel polyurethane foam, etc.) and introduced into solid phase extraction systems; a survey attending this issue will be developed as well in this review.
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Affiliation(s)
- Pablo H Pacheco
- Instituto de Química de San Luis (CCT-San Luis) - Área de Química Analítica, Facultad de Química Bioquímica y Farmacia, Universidad Nacional de San Luis, Laboratorio de Espectrometría de Masas, Bloque III, Ejército de los Andes 950, San Luis, CP5700, Argentina
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Tian H, Chang X, Hu Z, Yang K, He Q, Zhang L, Tu Z. Activated carbon modified with 4-(8-hydroxyquinoline-azo)benzamidine for selective solid-phase extraction and preconcentration of trace lead from environmental samples. Mikrochim Acta 2010. [DOI: 10.1007/s00604-010-0434-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Zhao RS, Wang X, Yuan JP. Highly sensitive determination of tetrabromobisphenol A and bisphenol A in environmental water samples by solid-phase extraction and liquid chromatography-tandem mass spectrometry. J Sep Sci 2010; 33:1652-7. [DOI: 10.1002/jssc.201000010] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Zhang Y, Wang W, Li L, Huang Y, Cao J. Eggshell membrane-based solid-phase extraction combined with hydride generation atomic fluorescence spectrometry for trace arsenic(V) in environmental water samples. Talanta 2009; 80:1907-12. [PMID: 20152431 DOI: 10.1016/j.talanta.2009.10.042] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2009] [Revised: 10/13/2009] [Accepted: 10/18/2009] [Indexed: 10/20/2022]
Abstract
The eggshell membrane (ESM) contains several surface functional groups such as amines, amides and carboxylic groups with potential as SPE adsorbent for the retention of target species of interest. In this paper, the potential use of ESM, a typical biomaterial, as solid-phase extraction (SPE) adsorbent is evaluated for analysis of trace arsenic(V) in environmental water samples in combination with hydride generation atomic fluorescence spectrometry (HG-AFS). In order to obtain the satisfactory recovery of arsenic(V), various parameters including the desorption and enrichment conditions such as pH, the flow rate and the volume of sample solution, the amount of ESM and the content of sodium chloride were systematically optimized and the effects of co-existed ions were also investigated in detail. Under the optimal conditions, arsenic(V) could be easily extracted by the ESM packed cartridge and the breakthrough adsorption capacity was found to be 3.9 microg g(-1). The favorable limit of detection (LOD) for arsenic(V) was found to be 0.001 microg L(-1) with an enrichment factor of 33.3, and the relative standard deviations (R.S.Ds) was 2.1% for 0.6 microg L(-1) arsenic (n=11). The reproducibility among columns was satisfactory (R.S.D. among columns is less than 5%). The proposed method has been successfully applied to analysis of arsenic(V) in aqueous environmental samples, which suggests the ESM can be an excellent SPE adsorbent for arsenic(V) pretreatment and enrichment from real water samples.
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Affiliation(s)
- Yongjiang Zhang
- The Key Laboratory of Luminescence and Realtime Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, No 2 Road Tiansheng, Beibei, Chongqing 400715, China
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Chen XW, Zou AM, Chen ML, Wang JH, Dasgupta PK. Live HeLa Cells Preconcentrate and Differentiate Inorganic Arsenic Species. Anal Chem 2009; 81:1291-6. [DOI: 10.1021/ac802475b] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xu-Wei Chen
- Research Center for Analytical Sciences, Northeastern University, Box 332, Shenyang 110004, China, and Department of Chemistry and Biochemistry, University of Texas at Arlington, Texas 76019-0065
| | - Ai-Mei Zou
- Research Center for Analytical Sciences, Northeastern University, Box 332, Shenyang 110004, China, and Department of Chemistry and Biochemistry, University of Texas at Arlington, Texas 76019-0065
| | - Ming-Li Chen
- Research Center for Analytical Sciences, Northeastern University, Box 332, Shenyang 110004, China, and Department of Chemistry and Biochemistry, University of Texas at Arlington, Texas 76019-0065
| | - Jian-Hua Wang
- Research Center for Analytical Sciences, Northeastern University, Box 332, Shenyang 110004, China, and Department of Chemistry and Biochemistry, University of Texas at Arlington, Texas 76019-0065
| | - Purnendu K. Dasgupta
- Research Center for Analytical Sciences, Northeastern University, Box 332, Shenyang 110004, China, and Department of Chemistry and Biochemistry, University of Texas at Arlington, Texas 76019-0065
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