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Wedad A. Al-onazi, Alarfaj NA, El-Tohamy MF, Al-Malki NA. Facile Dual Enhanced Modes of Nanoparticles/Sodium Dodecyl Sulfate for Luminescent Detection of Vitamin C in Commercial Fruit Juices. JOURNAL OF ANALYTICAL CHEMISTRY 2020. [DOI: 10.1134/s1061934820100020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Protein/ionic liquid/glassy carbon sensors following analyte focusing by ionic liquid micelle collapse for simultaneous determination of water soluble vitamins in plasma matrices. Talanta 2015; 139:150-8. [DOI: 10.1016/j.talanta.2015.02.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Revised: 02/10/2015] [Accepted: 02/14/2015] [Indexed: 12/26/2022]
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Flemmig J, Remmler J, Röhring F, Arnhold J. (−)-Epicatechin regenerates the chlorinating activity of myeloperoxidase in vitro and in neutrophil granulocytes. J Inorg Biochem 2014; 130:84-91. [DOI: 10.1016/j.jinorgbio.2013.10.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Revised: 10/02/2013] [Accepted: 10/02/2013] [Indexed: 12/15/2022]
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Determination of ascorbic acid in individual liver cancer cells by capillary electrophoresis with a platinum nanoparticles modified electrode. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2013.11.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Dickinson AJ, Armistead PM, Allbritton NL. Automated capillary electrophoresis system for fast single-cell analysis. Anal Chem 2013; 85:4797-804. [PMID: 23527995 DOI: 10.1021/ac4005887] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Capillary electrophoresis (CE) is a promising technique for single-cell analysis, but its use in biological studies has been limited by low throughput. This paper presents an automated platform employing microfabricated cell traps and a three-channel system for rapid buffer exchange for fast single-cell CE. Cells loaded with fluorescein and Oregon green were analyzed at a throughput of 3.5 cells/min with a resolution of 2.3 ± 0.6 for the fluorescein and Oregon green. Cellular protein kinase B (PKB) activity, as measured by immunofluorescence staining of phospho-PKB, was not altered, suggesting that this stress-activated kinase was not upregulated during the CE experiments and that basal cell physiology was not perturbed prior to cell lysis. The activity of sphingosine kinase (SK), which is often upregulated in cancer, was measured in leukemic cells by loading a sphingosine-fluorescein substrate into cells. Sphingosine fluorescein (SF), sphingosine-1-phosphate fluorescein (S1PF), and a third fluorescent species were identified in single cells. A single-cell throughput of 2.1 cells/min was achieved for 219 total cells. Eighty-eight percent of cells possessed upregulated SK activity, although subpopulations of cells with markedly different SK activity relative to that of the population average were readily identified. This system was capable of stable and reproducible separations of biological compounds in hundreds of adherent and nonadherent cells, enabling measurements of previously uncharacterized biological phenomena.
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Affiliation(s)
- Alexandra J Dickinson
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, United States
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Tsai TH, Chen TW, Chen SM. Selective Electroanalysis of Ascorbic Acid Using a Nickel Hexacyanoferrate and Poly(3,4-ethylenedioxythiophene) Hybrid Film Modified Electrode. ELECTROANAL 2010. [DOI: 10.1002/elan.200900610] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Measurement of ascorbic acid in single rat peritoneal mast cells using capillary electrophoresis with electrochemical detection. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:1093-7. [PMID: 20382091 DOI: 10.1016/j.jchromb.2010.03.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2009] [Revised: 03/10/2010] [Accepted: 03/11/2010] [Indexed: 11/22/2022]
Abstract
In this paper, the amount of ascorbic acid (AA) in single rat peritoneal mast cell was determined by the method of capillary electrophoresis (CE) with electrochemical detection (ED) at a carbon fiber microdisk bundle electrode. The CE-ED system and the single-cell injection system were rearranged to make the operation more convenient and efficient. In the experiment, a self-made holder made of foam was used to keep the capillary from swing, which kept the stability of the baseline of the electropherogram. The single cell was lysed completely within 5s using the 0.1% sodium dodecylsulfate (SDS) as the cell lysis solution together with the lysis voltage of 2 kV. The quantitation analysis was accomplished by the use of calibration curves, and the amount of AA in single rat peritoneal mast cell was from 2.4 to 7.1 fmol.
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Sun X, Niu Y, Bi S, Zhang S. Determination of ascorbic acid in individual rat hepatocyte cells based on capillary electrophoresis with electrochemiluminescence detection. Electrophoresis 2008; 29:2918-24. [PMID: 18546168 DOI: 10.1002/elps.200700792] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A novel method to detect ascorbic acid (AA) in individual rat hepatocyte cells was developed by combining CE with electrochemiluminescence (ECL) based on tris(2,2'-bipyridine) ruthenium(II) (Ru(bpy)(3)2+). A single cell, followed by 0.1% SDS as cell lysis solution, was injected into the inlet of the separation capillary by electromigration. After optimizing the analytical conditions, the RSDs of migration time and peak height were 0.38% and 2.6% for 1.0x10(-5) M AA (n=10), respectively. The linear range of AA was from 1.0x10(-8) to 5.0x10(-5) M with a correlation coefficient of 0.9979 and the LOD (S/N=3) was estimated to be 1.0x10(-8) M. This method has been successfully applied to determine AA in single rat hepatocytes and the amount of AA in seven rat hepatocytes ranged from 16 to 62 fmol. The above results demonstrated that CE coupled with ECL is convenient, sensitive, and will become an attractive alternative method for single-cell analysis.
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Affiliation(s)
- Xuemei Sun
- Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, China
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Sun X, Niu Y, Bi S, Zhang S. Determination of ascorbic acid in individual rat hepatocyte by capillary electrophoresis with electrochemical detection. J Chromatogr B Analyt Technol Biomed Life Sci 2008; 870:46-50. [DOI: 10.1016/j.jchromb.2008.05.035] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2007] [Revised: 04/17/2008] [Accepted: 05/23/2008] [Indexed: 02/07/2023]
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Nojavan S, Khalilian F, Kiaie FM, Rahimi A, Arabanian A, Chalavi S. Extraction and quantitative determination of ascorbic acid during different maturity stages of Rosa canina L. fruit. J Food Compost Anal 2008. [DOI: 10.1016/j.jfca.2007.11.007] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Borland LM, Kottegoda S, Phillips KS, Allbritton NL. Chemical analysis of single cells. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2008; 1:191-227. [PMID: 20636079 DOI: 10.1146/annurev.anchem.1.031207.113100] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Chemical analysis of single cells requires methods for quickly and quantitatively detecting a diverse array of analytes from extremely small volumes (femtoliters to nanoliters) with very high sensitivity and selectivity. Microelectrophoretic separations, using both traditional capillary electrophoresis and emerging microfluidic methods, are well suited for handling the unique size of single cells and limited numbers of intracellular molecules. Numerous analytes, ranging from small molecules such as amino acids and neurotransmitters to large proteins and subcellular organelles, have been quantified in single cells using microelectrophoretic separation techniques. Microseparation techniques, coupled to varying detection schemes including absorbance and fluorescence detection, electrochemical detection, and mass spectrometry, have allowed researchers to examine a number of processes inside single cells. This review also touches on a promising direction in single cell cytometry: the development of microfluidics for integrated cellular manipulation, chemical processing, and separation of cellular contents.
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Affiliation(s)
- Laura M Borland
- Department of Chemistry, University of North Carolina at Chapel Hill, 27599, USA
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Chen R, Cheng H, Wu W, Ai X, Huang W, Wang Z, Cheng J. Analysis of inorganic and small organic ions by CE with amperometric detection. Electrophoresis 2007; 28:3347-61. [PMID: 17847134 DOI: 10.1002/elps.200700249] [Citation(s) in RCA: 13] [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
Capillary electrophoresis has become a widely useful analytical technology. Amperometric detection is extensively employed in capillary electrophoresis for its many inherent virtues, such as rapid response, remarkable sensitivity, and low cost of both detectors and instrumentations. Analysis of inorganic and small organic ions by capillary electrophoresis is an important research field. This review focuses on the recent developments of capillary electrophoresis coupled with amperometric detection for analysis of inorganic and small organic ions. Advancements in electrophoresis separation modes, amperometric detection modes, working electrodes, and applications of inorganic ions, amino acids, phenols, and amines are discussed.
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Affiliation(s)
- Rongsheng Chen
- Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China
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Wang CC, Wu SM. Simultaneous determination of l-ascorbic acid, ascorbic acid-2-phosphate magnesium salt, and ascorbic acid-6-palmitate in commercial cosmetics by micellar electrokinetic capillary electrophoresis. Anal Chim Acta 2006; 576:124-9. [PMID: 17723623 DOI: 10.1016/j.aca.2005.12.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2005] [Revised: 12/06/2005] [Accepted: 12/08/2005] [Indexed: 11/24/2022]
Abstract
L-ascorbic acid (LAA) can be used as a whitening agent in cosmetics. Because of its instability, some more stable derivatives have been developed to control melanin production, such as ascorbic acid-2-phosphate magnesium salt (AAPM) and ascorbic acid-6-palmitate (AA6P). To assess the quality of cosmetics, a micellar electrokinetic capillary electrophoresis technique (MEKC) was established for simultaneous analysis of AA and its two derivatives. Separation was performed with 10mM borate (pH 9.5) containing 50 mM sodium dodecyl sulfate (SDS) at 20 kV. The detection wavelength was 265 nm. Several parameters, including borate concentration, buffer pH, and SDS level, were investigated. On method validation, calibration curves were linear over a concentration range of 150.0-1000.0 microM for LAA and 200.0-1000.0 microM for AAPM and AA6P. For intraday and interday analysis, relative standard deviation and relative errors were all less than 3%. Limits of detection were 70 microM for AAPM and AA6P, and 50 microM for LAA. All recoveries were greater than 95%. This method was applied to quality control of commercial cosmetics.
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Affiliation(s)
- Chun-Chi Wang
- Graduate Institute of Pharmaceutical Science, College of Pharmacy, Kaohsiung, Medical University, Kaohsiung 807, Taiwan
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Xia F, Jin W, Yin X, Fang Z. Single-cell analysis by electrochemical detection with a microfluidic device. J Chromatogr A 2005; 1063:227-33. [PMID: 15700475 DOI: 10.1016/j.chroma.2004.12.022] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel electrochemical method with a microfluidic device was developed for analysis of single cells. In this method, cell injection, loading and cell lysis, and electrokinetic transportation and detection of intracellular species were integrated in a microfluidic chip with a double-T injector coupled with an end-channel amperometric detector. A single cell was loaded at the double-T injector on the microfluidic chip by using electric field. Then, the docked cell was lysed by a direct current electric field strength of 220 V/cm. The analyte of interest inside the cell was electrokinetically transported to the detection end of separation channel and was electrochemically detected. External standardization was used to quantify the analyte of interest in individual cells. Ascorbic acid (AA) in single wheat callus cells was chosen as the model compound. AA could be directly detected at a carbon fiber disk bundle electrode. The selectivity of electrochemical detection made the electropherogram simple. The technique described here could, in principle, be applied to a variety of electroactive species within single cells.
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Affiliation(s)
- Fangquan Xia
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
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Assay of amino acids in individual human lymphocytes by capillary zone electrophoresis with electrochemical detection. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(02)01521-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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