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Wang H, Zhang W, Wan J, Liu W, Yu B, Jin Q, Guan M. Microchip-based human serum atherogenic lipoprotein profile analysis. Anal Biochem 2014; 467:75-83. [DOI: 10.1016/j.ab.2014.08.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 08/24/2014] [Accepted: 08/25/2014] [Indexed: 10/24/2022]
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2
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Chung M, Kim D, Herr AE. Polymer sieving matrices in microanalytical electrophoresis. Analyst 2014; 139:5635-54. [DOI: 10.1039/c4an01179a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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3
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Liu YN, Shu TY, Xie HG, Lai WT, Liao YH, Su MY, Lin YS, Chen YY, Lin YJ, Chong CP, Liu MY. Characterization of in vitro modified human very low-density lipoprotein particles and phospholipids by capillary electrophoresis. Int J Mol Sci 2012. [PMID: 23208377 PMCID: PMC3546697 DOI: 10.3390/ijms131216400] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A simple capillary zone electrophoresis (CZE) method was used to characterize human very low-density lipoprotein (VLDL) particles for four healthy donors. One major peak was observed for native, in vitro oxidized and glycated VLDL particles. The effective mobilities and peak areas of the capillary electrophoresis (CE) profiles showed good reproducibility and precision. The mobility of the oxidized VLDL peak was higher than that of the native VLDL. The mobility of the glycated VLDL peak was similar to that of the native VLDL. Phospholipids isolated from VLDL particles were analyzed by our recently developed micellar electrokinetic chromatography (MEKC) with a high-salt stacking method. At absorbance 200 nm, the native VLDL phospholipids showed a major peak and a minor peak for each donor. For oxidized VLDL phospholipids, the area of the major peak reduced for three donors, possibly due to phospholipid decomposition. For glycated VLDL phospholipids, the peak mobilities were more positive than native VLDL phospholipids for two donors, possibly due to phospholipid-linked advanced glycation end products (AGEs). Very interestingly, at absorbance 234 nm, the major peak of oxidized VLDL phospholipids was resolved as two peaks for each donor, possibly due to conjugated dienes formed upon oxidation.
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Affiliation(s)
- Yi-Ning Liu
- Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan.
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4
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Rodat-Boutonnet A, Naccache P, Morin A, Fabre J, Feurer B, Couderc F. A comparative study of LED-induced fluorescence and laser-induced fluorescence in SDS-CGE: Application to the analysis of antibodies. Electrophoresis 2012; 33:1709-14. [DOI: 10.1002/elps.201200132] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
| | | | | | | | | | - François Couderc
- Laboratoire des IMRCP,; Université Paul Sabatier; Université de Toulouse; Toulouse; France
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5
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Application of Polydimethylsiloxane/Glass Microchips for Fast Electrophoretic Separation of Serum High-density Lipoprotein Subclasses. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2012. [DOI: 10.1016/s1872-2040(11)60531-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Analytical applications of the electrochemiluminescence of tris(2,2′-bipyridyl)ruthenium(II) coupled to capillary/microchip electrophoresis: A review. Anal Chim Acta 2011; 704:16-32. [DOI: 10.1016/j.aca.2011.07.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 07/09/2011] [Accepted: 07/11/2011] [Indexed: 11/24/2022]
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7
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Wang H, Han C, Wang H, Jin Q, Wang D, Cao L, Wang G. Simultaneous Determination of High-Density Lipoprotein, Very Low-Density Lipoprotein and Low-Density Lipoprotein Subclass in Human Serum by Microchip CE. Chromatographia 2011. [DOI: 10.1007/s10337-011-2147-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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AL-Othman ZA, Ali I. NANO CAPILLARY ELECTROPHORESIS IN MICROCHIPS: A NEED OF THE PRESENT CENTURY. J LIQ CHROMATOGR R T 2011. [DOI: 10.1080/10826076.2011.566031] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Zeid A. AL-Othman
- a Department of Chemistry, College of Science , King Saud University , Riyadh, Kingdom of Saudi Arabia
| | - Imran Ali
- b Department of Chemistry , Jamia Millia Islamia, (Central University) , New Delhi, India
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9
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Baba Y. Nanobiodevices for Genome Analysis, Proteome Analysis, and Biomedical Applications. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2011. [DOI: 10.1246/bcsj.20100341] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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10
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Ruecha N, Siangproh W, Chailapakul O. A fast and highly sensitive detection of cholesterol using polymer microfluidic devices and amperometric system. Talanta 2011; 84:1323-8. [PMID: 21641446 DOI: 10.1016/j.talanta.2011.02.040] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Revised: 02/03/2011] [Accepted: 02/25/2011] [Indexed: 11/16/2022]
Abstract
In this work, the rapid detection of cholesterol using poly(dimethylsiloxane) microchip capillary electrophoresis, based on the coupling of enzymatic assays and electrochemical detection, was developed. Direct amperometric detection for poly(dimethylsiloxane) (PDMS) microchip capillary electrophoresis was successfully applied to quantify cholesterol levels. Factors influencing the performance of the method (such as the concentration and pH value of buffer electrolyte, concentration of cholesterol oxidase enzyme (ChOx), effect of solvent on the cholesterol solubility, and interferences) were carefully investigated and optimized. The migration time of hydrogen peroxide, product of the reaction, was less than 100 s when using 40 mM phosphate buffer at pH 7.0 as the running buffer, a concentration of 0.68 U/mL of the ChOx, a separation voltage of +1.6 kV, an injection time of 20s, and a detection potential of +0.5 V. PDMS microchip capillary electrophoresis showed linearity between 38.7 μg/dL (1 μM) and 270.6 mg/dL (7 mM) for the cholesterol standard; the detection limit was determined as 38.7 ng/dL (1 nM). To demonstrate the potential of this assay, the proposed method was applied to quantify cholesterol in bovine serum. The percentages of recoveries were assessed over the range of 98.9-101.8%. The sample throughput was found to be 60 samples per hour. Therefore, PDMS microchip capillary electrophoresis, based on the coupling of enzymatic assays and electrochemical detection, is very rapid, accurate and sensitive method for the determination of cholesterol levels.
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Affiliation(s)
- Nipapan Ruecha
- Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Patumwan, Bangkok 10330, Thailand
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11
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Kaminikado K, Ikeda R, Idegami K, Nagatani N, Vestergaard MC, Saito M, Tamiya E. A rapid gel electrophoretic chip for serum cholesterol determination. Analyst 2011; 136:1826-30. [DOI: 10.1039/c0an00992j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Tabuchi M, Seo M, Inoue T, Ikeda T, Kogure A, Inoue I, Katayama S, Matsunaga T, Hara A, Komoda T. Geometrical Separation Method for Lipoproteins Using Bioformulated-Fiber Matrix Electrophoresis: Size of High-Density Lipoprotein Does Not Reflect Its Density. Anal Chem 2010; 83:1131-6. [DOI: 10.1021/ac102402c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mari Tabuchi
- Department of Chemistry, Faculty of Science, Rikkyo University, 3-34-1, Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
- Research Information Center for Extremophile, Rikkyo University, 3-34-1, Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
| | - Makoto Seo
- Department of Biochemistry, Faculty of Medicine, Saitama Medical University, 38 Morohongo, Moroyama, Iruma-gun, Saitama 350-0495, Japan
| | - Takayuki Inoue
- Department of Chemistry, Faculty of Science, Rikkyo University, 3-34-1, Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
| | - Takeshi Ikeda
- Department of Chemistry, Faculty of Science, Rikkyo University, 3-34-1, Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
| | - Akinori Kogure
- Surface Analysis Division, Shimadzu Analytical & Measuring Center, Inc. 380-1, Horiyamashita, Hadano-city, Kanagawa, 259-1304, Japan
| | - Ikuo Inoue
- Department of Endocrinology and Diabetes, Faculty of Medicine, Saitama Medical University, 38 Morohongo, Moroyama, Iruma-gun, Saitama 350-0495, Japan
| | - Shigehiro Katayama
- Department of Endocrinology and Diabetes, Faculty of Medicine, Saitama Medical University, 38 Morohongo, Moroyama, Iruma-gun, Saitama 350-0495, Japan
| | - Toshiyuki Matsunaga
- Laboratory of Biochemistry, Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
| | - Akira Hara
- Laboratory of Biochemistry, Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
| | - Tsugikazu Komoda
- Department of Biochemistry, Faculty of Medicine, Saitama Medical University, 38 Morohongo, Moroyama, Iruma-gun, Saitama 350-0495, Japan
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13
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Ikeda T, Seo M, Inoue I, Katayama S, Matsunaga T, Hara A, Komoda T, Tabuchi M. Direct and simple fluorescence detection method for oxidized lipoproteins. Anal Chem 2010; 82:1128-32. [PMID: 20043691 DOI: 10.1021/ac902018a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The quantification of low-density lipoprotein (LDL) and high-density lipoprotein (HDL) is currently one of the most important clinical measurements for characterizing metabolic syndrome. However, recent studies have revealed additional factors that may be more strongly associated with the coronary heart disease than simple measurement of LDL or HDL levels, such as small dense (sd) LDL particles and oxidized LDL or HDL particles. Although several methods using enzyme-antibody detection systems or fluorescent probes have been devised to characterize these factors, such methods are expensive to implement for clinical measurements. Here, we present a straightforward analytical method for direct quantitation of oxidized lipoproteins by fluorescence spectrometry, with excitation in the UV (365 +/- 10 nm) or visible (470 +/- 10 nm) range and emission detected at 450 +/- 30 nm or 535 +/- 15 nm. This method can be readily applied for clinical measurement in patients with dyslipidemia using only 1 microL of 1 mg/mL of lipoprotein and without the need for any expensive detection antibodies. Using this new technique, biological samples from patients with dyslipidemia showed higher fluorescence intensities than samples from normal subjects when detecting oxidized LDL and light HDL (d = 1.063-1.125 g/mL), whereas samples from patients with dyslipidemia showed lower fluorescence intensities than samples from normal subjects when measuring oxidized heavy HDL (d = 1.125-1.210 g/mL) levels.
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Affiliation(s)
- Takeshi Ikeda
- Department of Chemistry, Graduate School of Science, Rikkyo University, 3-34-1, Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
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14
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Zheng H, Cong H, Wang H, Jin Q, Zhao J. A Microchip-Based Method for Rapid Separation of Subclasses of High-Density Lipoprotein. Chromatographia 2010. [DOI: 10.1365/s10337-010-1602-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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15
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Wang AJ, Vainikka K, Witos J, D'Ulivo L, Cilpa G, Kovanen PT, Oörni K, Jauhiainen M, Riekkola ML. Partial filling affinity capillary electrophoresis with cationic poly(vinylpyrrolidone)-based copolymer coatings for studies on human lipoprotein-steroid interactions. Anal Biochem 2009; 399:93-101. [PMID: 19932676 DOI: 10.1016/j.ab.2009.11.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Revised: 11/18/2009] [Accepted: 11/18/2009] [Indexed: 11/27/2022]
Abstract
Human plasma lipoproteins have strong hydrophobic interactions with steroids and their fatty acyl derivatives such as estradiol fatty acyl esters. In this work, affinity capillary electrophoresis with the partial filling technique was applied to study the hydrophobic interactions between lipoproteins, which are nanometer-sized particles, and nonconjugated steroids. The capillaries were first rinsed with one of two novel poly(vinylpyrrolidone) (PVP)-based cationic copolymers that were strongly adsorbed onto the fused-silica surface via electrostatic interactions. This surface treatment greatly suppressed the adsorption of lipoproteins. Low-density lipoprotein (LDL) and high-density lipoprotein (HDL) particles were then employed in the coated capillaries as pseudostationary phase in the partial filling mode. The changes in corrected migration times of steroids increased linearly with the filling time of the lipoproteins. The affinity constants between the steroids and lipoproteins were calculated, and the most hydrophobic steroid studied, progesterone, had stronger affinity than testosterone or androstenedione toward both LDL and HDL. Affinity between steroids and LDL was stronger than that between steroids and HDL. Interactions between the steroids and lipoproteins were mainly nonspecific with particle lipid components, whereas some were site specific with the apolipoproteins. The developed technique has great potential for determination of the affinity of various compounds toward lipoproteins.
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Affiliation(s)
- Ai-Jun Wang
- Laboratory of Analytical Chemistry, Department of Chemistry, University of Helsinki, FIN-00014 Helsinki, Finland
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16
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Wang AJ, Witos J, D'Ulivo L, Vainikka K, Riekkola ML. Noncovalent poly(1-vinylpyrrolidone)-based copolymer coating for the separation of basic proteins and lipoproteins by CE. Electrophoresis 2009; 30:3939-46. [DOI: 10.1002/elps.200900395] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Xiao D, Yan L, Yuan H, Zhao S, Yang X, Choi MMF. CE with LED-based detection: An update. Electrophoresis 2009; 30:189-202. [DOI: 10.1002/elps.200800415] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Abstract
Chemical cytometry, referring to the analysis of the chemical contents in individual cells, has been in intensive study since Kennedy's first work that was published in Science. The early researches relied on fine-tip capillaries to capture the cells and do the analyses, which were lab- and time-intensive and required high skills of operation. The emergence of microfluidics has greatly spurred this research field and a great number of research papers have been published in the last decades. Highly integrated microfluidic chips have been developed to capture multiple single cells, lyse them, perform chemical reactions in enclosed microchambers, separate contents by CE and detect chemical species in individual cells. This review focuses on the development of relevant components and their integration for on-chip chemical cytometry.
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Affiliation(s)
- Hui Yan
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong, P. R. China
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19
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Okada H, Kaji N, Tokeshi M, Baba Y. Highly sensitive double‐fluorescent dye staining on microchip electrophoresis for analysis of milk proteins. Electrophoresis 2008; 29:2533-8. [DOI: 10.1002/elps.200700775] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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Chen Y, Zhang L, Chen G. Fabrication, modification, and application of poly(methyl methacrylate) microfluidic chips. Electrophoresis 2008; 29:1801-14. [DOI: 10.1002/elps.200700552] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Wang H, Wang HM, Jin QH, Cong H, Zhuang GS, Zhao JL, Sun CL, Song HW, Wang W. Microchip-based small, dense low-density lipoproteins assay for coronary heart disease risk assessment. Electrophoresis 2008; 29:1932-41. [DOI: 10.1002/elps.200700631] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Roman GT, Kennedy RT. Fully integrated microfluidic separations systems for biochemical analysis. J Chromatogr A 2007; 1168:170-88; discussion 169. [PMID: 17659293 DOI: 10.1016/j.chroma.2007.06.010] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2007] [Accepted: 06/05/2007] [Indexed: 10/23/2022]
Abstract
Over the past decade a tremendous amount of research has been performed using microfluidic analytical devices to detect over 200 different chemical species. Most of this work has involved substantial integration of fluid manipulation components such as separation channels, valves, and filters. This level of integration has enabled complex sample processing on miniscule sample volumes. Such devices have also demonstrated high throughput, sensitivity, and separation performance. Although the miniaturization of fluidics has been highly valuable, these devices typically rely on conventional ancillary equipment such as power supplies, detection systems, and pumps for operation. This auxiliary equipment prevents the full realization of a "lab-on-a-chip" device with complete portability, autonomous operation, and low cost. Integration and/or miniaturization of ancillary components would dramatically increase the capability and impact of microfluidic separations systems. This review describes recent efforts to incorporate auxiliary equipment either as miniaturized plug-in modules or directly fabricated into the microfluidic device.
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Affiliation(s)
- Gregory T Roman
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA
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23
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Zhang Y, Ping G, Zhu B, Kaji N, Tokeshi M, Baba Y. Enhanced electrophoretic resolution of monosulfate glycosaminoglycan disaccharide isomers on poly(methyl methacrylate) chips. Electrophoresis 2007; 28:414-21. [PMID: 17361462 DOI: 10.1002/elps.200600339] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
To improve the separation of monosulfate glycosaminoglycan disaccharide isomers by microchip electrophoresis, we found that addition of 1,4-dioxane (DO) dramatically improved analyte resolution, probably due to solvation effects. Methylcellulose (MC) was tested for the ability to suppress EOF and analyte adsorption to the chip. To improve analyte resolution, buffer pH, beta-CD, and DO were systematically investigated. Fast separation was achieved by increasing the electric field strength, and field-amplified sample stacking occurred with increasing buffer concentrations. Therefore, based on our findings, we describe an efficient method for the separation of monosulfate and trisulfate unsaturated disaccharides (DeltaDi-UA2S, DeltaDi-4S, DeltaDi-6S, and DeltaDi-triS) derivatized with 2-aminoacridone hydrochloride. A mixture of monosulfate disaccharide isomers (DeltaDi-UA2S, DeltaDi-4S, and DeltaDi-6S) was baseline-separated within 75 s on a poly(methyl methacrylate) chip using a mixed buffer (DO/running buffer 57:43 v:v), 0.5% MC, pH 6.81, with an E(sep) of 558 V/cm. The theoretical plate was in the range of 5 x 10(5) to 1 x 10(6) m-1.
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Affiliation(s)
- Yong Zhang
- Graduate School of Pharmaceutical Sciences, the University of Tokushima, Tokushima, Japan.
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Götz S, Karst U. Recent developments in optical detection methods for microchip separations. Anal Bioanal Chem 2007; 387:183-92. [PMID: 17031620 PMCID: PMC7080113 DOI: 10.1007/s00216-006-0820-8] [Citation(s) in RCA: 124] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2006] [Revised: 08/18/2006] [Accepted: 08/31/2006] [Indexed: 10/26/2022]
Abstract
This paper summarizes the features and performances of optical detection systems currently applied in order to monitor separations on microchip devices. Fluorescence detection, which delivers very high sensitivity and selectivity, is still the most widely applied method of detection. Instruments utilizing laser-induced fluorescence (LIF) and lamp-based fluorescence along with recent applications of light-emitting diodes (LED) as excitation sources are also covered in this paper. Since chemiluminescence detection can be achieved using extremely simple devices which no longer require light sources and optical components for focusing and collimation, interesting approaches based on this technique are presented, too. Although UV/vis absorbance is a detection method that is commonly used in standard desktop electrophoresis and liquid chromatography instruments, it has not yet reached the same level of popularity for microchip applications. Current applications of UV/vis absorbance detection to microchip separations and innovative approaches that increase sensitivity are described. This article, which contains 85 references, focuses on developments and applications published within the last three years, points out exciting new approaches, and provides future perspectives on this field.
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Affiliation(s)
- Sebastian Götz
- Chemical Analysis Group and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Uwe Karst
- Chemical Analysis Group and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
- Present Address: Institute of Inorganic and Analytical Chemistry, University of Münster, Corrensstr. 30, 48149 Münster, Germany
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Petr J, Maier V, Horáková J, Sevcík J, Stránský Z. Capillary isotachophoresis from the student point of view – images and the reality. J Sep Sci 2006; 29:2705-15. [PMID: 17305231 DOI: 10.1002/jssc.200600249] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A review of some fundamental aspects of ITP from the student point of view, imaginations of some basic facts and laws, use of ITP, and the recent trends are presented. The results of theoretical computations of ITP separation processes are added for comparison of imaginations with the exact mathematical description.
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Affiliation(s)
- Jan Petr
- Department of Analytical Chemistrý, Palackỳ University, Trída Svobody 8, Olomouc, Czech Republic.
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26
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Wang W, Xu X, Bin Q, Ling J, Chen G. A new method for fabrication of an integrated indium tin oxide electrode on electrophoresis microchips with amperometric detection and its application for determination of synephrine and hesperidin in pericarpium citri reticulatae. Electrophoresis 2006; 27:4174-81. [PMID: 17001742 DOI: 10.1002/elps.200600159] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A new, simple, and fast method to integrate indium tin oxide electrode in an amperometric detection (AD) microchip is introduced. Without the help of photoresist and complicated apparatus, the microchip could be fabricated in most laboratories in a very short time by this method. The experiment indicated that the microchip was stable and had good reproducibility. On this microchip, a new method was established to separate and determine synephrine and hesperidin, which are the main electroactively bioactive ingredients of pericarpium citri reticulatae, by AD. Under the optimal conditions, the two compounds could be completely separated within 5.5 min and the detection limits were 0.13 and 0.57 microg/mL, respectively. The proposed method has been successfully used to determine synephrine and hesperidin in real pericarpium citri reticulatae sample, and the results show that the proposed method is sensitive, reliable, fast, and economical.
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Affiliation(s)
- Wei Wang
- Key Laboratory of Analysis and Detection Technology for Food Safety, Ministry of Education, Fuzhou University, Fuzhou, Fujian, China
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27
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Jabasini M, Ewis AA, Fouad M, Dang F, Ping G, Shinka T, Nakahori Y, Kaji N, Tokeshi M, Baba Y. Rapid multiplexing and simultaneous detection of human spermatogenetic failure with a 12 lane microchip electrophoresis system. Biol Pharm Bull 2006; 29:1487-9. [PMID: 16819195 DOI: 10.1248/bpb.29.1487] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
For the amplification and ultrafast separation of the genetic markers and DNA sequences that are related to human male infertility, a multiplex PCR for amplifying three DNA sequence-tagged sites (STS) located on the human Y chromosome with possible roles in the spermatogenesis process has been designed and applied followed by separation on a microchip. First, the optimum T(m) degree for the three DNA markers was optimized and determined experimentally, and the three DNA STS were amplified. These three DNA markers were then separated on a 12-lane microchip electrophoresis system, which can analyze the DNA markers on 12 channels simultaneously. The combination of these two technologies, multiplex PCR and microchip electrophoresis, allows the analysis of 36 DNA markers (12x3) within only 180 s.
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Affiliation(s)
- Mohammad Jabasini
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Japan.
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28
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Yu YH, Descalzo AB, Shen Z, Röhr H, Liu Q, Wang YW, Spieles M, Li YZ, Rurack K, You XZ. Mono- and Di(dimethylamino)styryl-Substituted Borondipyrromethene and Borondiindomethene Dyes with Intense Near-Infrared Fluorescence. Chem Asian J 2006; 1:176-87. [PMID: 17441053 DOI: 10.1002/asia.200600042] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Four novel borondipyrromethene (BDP) and -diindomethene (BDI) dyes with one or two (dimethylamino)styryl extensions at the chromophore were synthesized and spectroscopically investigated. An X-ray crystal structure shows that the extended auxochrome is virtually planar. All dyes thus display intense red/near infrared (NIR) absorption and emission. The (dimethylamino)styryl group induces a charge-transfer character that entails bright solvatochromic fluorescence, which is only quenched with increasing solvent polarity according to the energy-gap law. The dye with an additional dimethylanilino group at the meso position of BDP shows a remarkable switching of lipophilicity by protonation. Two dyes with an 8-hydroxyquinoline ligand at the meso position display quenched emission in the presence of Hg2+ or Al3+ owing to electron transfer from the excited BDP to the complexed receptor. The BDI dye presents a pH indicator with bright fluorescence and extremely low fluorescence anisotropy.
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Affiliation(s)
- Yan-Hong Yu
- Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
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