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Fu Q, Xie Y, Gao F, Zhu W, Lang X, Singh R, Zhang B, Kumar S. Signal-enhanced multi-core fiber-based WaveFlex biosensor for ultra-sensitive xanthine detection. OPTICS EXPRESS 2023; 31:43178-43197. [PMID: 38178418 DOI: 10.1364/oe.503443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 11/27/2023] [Indexed: 01/06/2024]
Abstract
In this work, we introduce a novel multimode fiber (MMF) - seven core fiber (SCF) - MMF (MCM) optical fiber biosensor, also known as the WaveFlex biosensor (plasma wave assisted fiber biosensor), based on localized surface plasmon resonance (LSPR) for qualitative detection of xanthine. Xanthine is a purine base widely distributed in human blood and tissues, and commonly used as an indicator for various disease detections. The MCM sensor incorporates a tapered optical fiber structure, fabricated using the combiner manufacturing system (CMS), and is designed with SCF and MMF. By effectively harnessing LSPR, the sensor boosts the attachment points of biomolecules on the probe surface through immobilized tungsten disulfide (WS2)-thin layers, gold nanoparticles (AuNPs), and carbon nitride quantum dots (C3N-QDs). The functionalization of xanthine oxidase (XO) on the sensing probe further enhances the sensor's specificity. The proposed WaveFlex biosensor exhibits a remarkable sensitivity of 3.2 nm/mM and a low detection limit of 96.75 µM within the linear detection range of 100 - 900 µM. Moreover, the sensor probe demonstrates excellent reusability, reproducibility, stability, and selectivity. With its sensitivity, biocompatibility, and immense potential for detecting human serum and fish products, this WaveFlex biosensor presents a promising platform for future applications.
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Monodispersed gold nanoparticles entrapped in ordered mesoporous carbon/silica nanocomposites as xanthine oxidase mimic for electrochemical sensing of xanthine. Mikrochim Acta 2020; 187:543. [PMID: 32880716 DOI: 10.1007/s00604-020-04494-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 08/18/2020] [Indexed: 12/21/2022]
Abstract
Monodispersed Au nanoparticles in ordered mesoporous carbon/silica (Au/OMCS) nanocomposites were prepared by the solvent evaporation induced self-assembly. Au/OMCS nanocomposites were characterized through XRD, BET, and TEM. The obtained nanocomposites exhibit uniform mesopores with the size of 18 ± 2 nm. And ultrafine Au nanoparticles with the size of 3~7 nm are well dispersed in the cavities. An ultrasensitive nanoenzyme sensor was fabricated based on a Au/OMCS-modified electrode. The Au/OMCS-modified electrode displays high xanthine oxidase-like catalytic activity evaluated through cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The DPV response currents are linearly dependent on concentrations of xanthine (Xa) in the range 0.10-20 μM, along with a high sensitivity of 6.84 μA μM-1 cm-2 and very low detection limit of 0.006 μM (S/N = 3) under the optimal working potential of 0.64 V vs. SCE. Interference experiments show that the nanoenzyme sensor has no obvious responses to most potentially interfering species at a potential of 0.64 V. The fabricated sensor has been applied to the determination of Xa in spiked urine samples with recoveries ranging from 98.26 to 101.4%. Graphical abstract.
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Huang Z, Scotland KB, Li Y, Guo J, McGeer PL, Lange D, Chen DDY. Application of multisegment injection on quantification of creatinine and standard addition analysis of urinary 5‐hydroxyindoleacetic acid simultaneously with creatinine normalization. Electrophoresis 2020; 41:183-193. [DOI: 10.1002/elps.201900456] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 12/07/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Zi‐Ao Huang
- Department of ChemistryUniversity of British Columbia Vancouver British Columbia Canada
| | - Kymora B. Scotland
- Department of Urologic Sciences, The Stone Centre at Vancouver General HospitalUniversity of British Columbia Vancouver British Columbia Canada
| | - Yueyang Li
- Department of ChemistryUniversity of British Columbia Vancouver British Columbia Canada
| | - Jian‐Ping Guo
- Aurin Biotech Inc. Vancouver British Columbia Canada
| | | | - Dirk Lange
- Department of Urologic Sciences, The Stone Centre at Vancouver General HospitalUniversity of British Columbia Vancouver British Columbia Canada
| | - David D. Y. Chen
- Department of ChemistryUniversity of British Columbia Vancouver British Columbia Canada
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Zhou DD, Zhang Q, Zhang H, Wang YZ, Yang FQ, Wang SP, Wang YT. Cupric ion functionalized polydopamine coated magnetic microspheres as solid-phase adsorbent for the extraction of purines in plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2019; 1120:95-103. [DOI: 10.1016/j.jchromb.2019.04.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 04/29/2019] [Accepted: 04/30/2019] [Indexed: 01/08/2023]
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Synthesis and characterisation of non-bonded 1.7 μm thin-shell (TS1.7-100 nm) silica particles for the rapid separation and analysis of uric acid and creatinine in human urine by hydrophilic interaction chromatography. J Chromatogr A 2017; 1506:37-44. [DOI: 10.1016/j.chroma.2017.05.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 04/04/2017] [Accepted: 05/02/2017] [Indexed: 02/04/2023]
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LI X, FU L, WENG Q, LI J. A Miniaturized Transverse Flow Gating Interface for the On-line Coupling of Solid-phase Extraction with Capillary Electrophoresis. ANAL SCI 2014; 30:1151-6. [DOI: 10.2116/analsci.30.1151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Xintong LI
- Department of Chemistry, Liaoning Normal University
| | - Lianjuan FU
- Department of Chemistry, Liaoning Normal University
| | | | - Jinxiang LI
- Department of Chemistry, Liaoning Normal University
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Liu B, Wang XL, Lian HT, Sun XY. Xanthine microsensor based on polypyrrole molecularly imprinted film modified carbon fiber microelectrodes. Anal Biochem 2013; 440:220-6. [PMID: 23747534 DOI: 10.1016/j.ab.2013.05.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 05/18/2013] [Accepted: 05/22/2013] [Indexed: 10/26/2022]
Abstract
A molecularly imprinted polymers (MIPs) microsensor was presented as a carbon fiber microelectrode (CFME) coating for specifically recognizing xanthine (Xan). The polymeric film was obtained based on the imprinted procedure of electropolymerization of pyrrole in the presence of the template molecule Xan by cyclic voltammetry, and template was removed by magnetic stirring. Under the optimum conditions, a satisfactory molecularly binding selectivity of Xan was obtained from the MIPs microsensor with an imprinting factor (IF) of 6.63 and a linear response to concentration in certain ranges. The ranges are from 4.0 × 10⁻⁶ to 6.0 × 10⁻⁵ M and from 8.0 × 10⁻⁵ to 2.0 × 10⁻³ M with a detection limit of 2.5 × 10⁻⁷ M. Meanwhile, good stability (relative standard deviation [RSD] = 3.2%, n = 10) and reproducibility (RSD = 2.0%, n = 10) were observed, and recoveries ranging from 96.9 to 102.5% were calculated when applied to Xan determination in real blood serum samples.
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Affiliation(s)
- Bin Liu
- College of Material Science and Engineering, Huaqiao University, Xiamen 361021, People's Republic of China.
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Kohler I, Schappler J, Rudaz S. Microextraction techniques combined with capillary electrophoresis in bioanalysis. Anal Bioanal Chem 2012; 405:125-41. [PMID: 22965532 DOI: 10.1007/s00216-012-6367-y] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 08/14/2012] [Accepted: 08/19/2012] [Indexed: 11/28/2022]
Abstract
Over the past two decades, many environmentally sustainable sample-preparation techniques have been proposed, with the objective of reducing the use of toxic organic solvents or substituting these with environmentally friendly alternatives. Microextraction techniques (MEs), in which only a small amount of organic solvent is used, have several advantages, including reduced sample volume, analysis time, and operating costs. Thus, MEs are well adapted in bioanalysis, in which sample preparation is mandatory because of the complexity of a sample that is available in small quantities (mL or even μL only). Capillary electrophoresis (CE) is a powerful and efficient separation technique in which no organic solvents are required for analysis. Combination of CE with MEs is regarded as a very attractive environmentally sustainable analytical tool, and numerous applications have been reported over the last few decades for bioanalysis of low-molecular-weight compounds or for peptide analysis. In this paper we review the use of MEs combined with CE in bioanalysis. The review is divided into two sections: liquid and solid-based MEs. A brief practical and theoretical description of each ME is given, and the techniques are illustrated by relevant applications.
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Affiliation(s)
- Isabelle Kohler
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Bd d'Yvoy 20, 1211 Geneva 4, Switzerland
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Nagaraja P, Avinash K, Shivakumar A, Krishna H. Quantification of creatinine in biological samples based on the pseudoenzyme activity of copper-creatinine complex. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 92:318-324. [PMID: 22446781 DOI: 10.1016/j.saa.2012.02.104] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2011] [Revised: 02/19/2012] [Accepted: 02/23/2012] [Indexed: 05/31/2023]
Abstract
Glomerular filtration rate (GFR), the marker of chronic kidney disease can be analyzed by the concentration of cystatin C or creatinine and its clearance in human urine and serum samples. The determination of cystatin C alone as an indicator of GFR does not provide high accuracy, and is more expensive, thus measurement of creatinine has an important role in estimating GFR. We have made an attempt to quantify creatinine based on its pseudoenzyme activity of creatinine in the presence of copper. Creatinine in the presence of copper oxidizes paraphenylenediamine dihydrochloride (PPDD) which couples with dimethylamino benzoicacid (DMAB) giving green colored chromogenic product with maximum absorbance at 710 nm. Kinetic parameters relating this reaction were evaluated. Analytical curves of creatinine by fixed time and rate methods were linear at 8.8-530 μmol L(-1) and 0.221-2.65 mmol L(-1), respectively. Recovery of creatinine varied from 97.8 to 107.8%. Limit of detection and limit of quantification were 2.55 and 8.52 μmol L(-1) respectively whereas Sandell's sensitivity and molar absorption coefficient values were 0.0407 μg cm(-2) and 0.1427×10(4) L mol(-1) cm(-1) respectively. Precision studies showed that within day imprecision was 0.745-1.26% and day-to-day imprecision was 1.55-3.65%. The proposed method was applied to human urine and serum samples and results were validated in accordance with modified Jaffe's procedure. Wide linearity ranges with good recovery, less tolerance from excipients and application of the method to serum and urine samples are the claims which ascertain much advantage to this method.
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Affiliation(s)
- Padmarajaiah Nagaraja
- Department of Studies in Chemistry, University of Mysore, Manasagangothri, Mysore, India.
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In-line solid-phase extraction-capillary electrophoresis coupled with mass spectrometry for determination of drugs of abuse in human urine. Anal Bioanal Chem 2012; 403:777-84. [PMID: 22370589 DOI: 10.1007/s00216-012-5872-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Revised: 02/09/2012] [Accepted: 02/14/2012] [Indexed: 10/28/2022]
Abstract
In-line solid-phase extraction-capillary electrophoresis coupled with mass spectrometric detection (SPE-CE-MS) has been used for determination of 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine (EDDP), codeine (COD), hydrocodeine (HCOD), and 6-acetylmorphine (6AM) in urine. The preconcentration system consists of a small capillary filled with Oasis HLB sorbent and inserted into the inlet section of the electrophoresis capillary. The SPE-CE-MS experimental conditions were optimized as follows: the sample (adjusted to pH 6.0) was loaded at 930 mbar for 60 min, elution was performed with methanol at 50 mbar for 35 s, 60 mmol L(-1) ammonium acetate at pH 3.8 was used as running buffer, the separation voltage was 30 kV, and the sheath liquid at a flow rate of 5.0 μL min(-1) was isopropanol-water 50:50 (v/v) containing 0.5% acetic acid. Analysis of urine samples spiked with the four drugs and diluted 1:1 (v/v) was studied in the linear range 0.08-10 ng mL(-1). Detection limits (LODs) (S/N = 3) were between 0.013 and 0.210 ng mL(-1). Repeatability (expressed as relative standard deviation) was below 7.2%. The method developed enables simple and effective determination of these drugs of abuse in urine samples at the levels encountered in toxicology and doping.
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Hou H, Xiong W, Zhang X, Song D, Tang G, Hu Q. LC-MS-MS Measurements of Urinary Creatinine and the Application of Creatinine Normalization Technique on Cotinine in Smokers' 24 Hour Urine. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2012; 2012:245415. [PMID: 23209947 PMCID: PMC3503330 DOI: 10.1155/2012/245415] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 08/29/2012] [Accepted: 08/31/2012] [Indexed: 05/03/2023]
Abstract
A simple and sensitive high performance liquid chromatography-tandem mass spectrometry (HPLC-ESI-MS-MS) method was developed and validated for the quantification of creatinine in human urine. The analysis was carried out on an Agilent Zorbax Eclipse XDB-C18 column (2.1 × 150 mm, 3.5 μm). The mobile phase was 0.1% formic acid in water and 0.1% formic acid in acetonitrile (50/50, v/v). Linear calibration curves were obtained in the concentration range of 1-2000.0 ng/mL, with a lower limit of quantification of 0.99 ng/mL. The intra- and interday precision (RSD) values were below 3%. The method was successfully applied to a bioequivalence study of creatinine in Chinese smokers and nonsmokers. The total cotinine in 24 h urine and cotinine : creatinine ratio were also positively associated (Pearson R = 0.942, P < 0.0001). However, cotinine : creatinine ratio varied significantly across smoking groups for the difference of individual. 24 h urinary cotinine was more appropriate for expressing correlation with tar than cotinine : creatinine ratio.
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Affiliation(s)
- Hongwei Hou
- China National Tobacco Quality Supervision and Test Center, Zhengzhou 450001, China
- *Hongwei Hou: and
| | - Wei Xiong
- China National Tobacco Quality Supervision and Test Center, Zhengzhou 450001, China
| | - Xiaotao Zhang
- China National Tobacco Quality Supervision and Test Center, Zhengzhou 450001, China
| | - Dongkui Song
- Department of Urology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Gangling Tang
- China National Tobacco Quality Supervision and Test Center, Zhengzhou 450001, China
| | - Qingyuan Hu
- China National Tobacco Quality Supervision and Test Center, Zhengzhou 450001, China
- *Qingyuan Hu:
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Preparation and full characterization of a micro-immunoaffinity monolithic column and its in-line coupling with capillary zone electrophoresis with Ochratoxin A as model solute. J Chromatogr A 2011; 1232:93-100. [PMID: 22078231 DOI: 10.1016/j.chroma.2011.10.061] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Revised: 10/05/2011] [Accepted: 10/14/2011] [Indexed: 11/23/2022]
Abstract
A micro-immunoaffinity monolithic column (μIAC) was developed and in-line coupled with capillary zone electrophoresis in a fully automated way with Ochratoxin A as test solute. The in-line micro-immunoaffinity columns based on monolithic methacrylate polymers (EDMA-GMA) were prepared in situ at the inlet end of a PTFE coated fused silica capillary by UV initiated polymerization and subsequently grafted with antibodies. These μIACs were thoroughly characterized. The synthesis of the polymeric support was first demonstrated to be reproducible in terms of permeability, surface properties and efficiency. The antibodies immobilization was then studied by a new original hydrodynamic method (ADECA) allowing the in situ quantitative determination (at a miniaturized scale) of the total amount of immobilized antibodies. The combination of this measurement with the binding capacity of the μIAC allowed, for the first time, the in situ determination of immobilized antibody activity. A total of 260 ± 15 ng (1.6 ± 0.1 pmol) of IgG antibodies/cm in 75 μm i.d. monolithic column (i.e. 18 μgmg(-1)) was obtained with (anti-Ochratoxin A/Ochratoxin A) as antibody/antigen model. 40% of the immobilized antibodies remain active corresponding to a binding capacity of 1.2 ± 0.2 pmol antigen/cm (i.e. 600 pg/cm of our test solute OTA), a very high capacity when dealing with trace analysis and with regard to the detection limits (30 pg and 0.5 pg with UV and LIF detection, respectively). The recovery yields were quantitative with negligible non-specific adsorption and allow analysis of diluted samples (1 ngmL(-1)) for a percolated volume of 10 μL. It was also demonstrated that despite the progressive denaturation of antibodies consecutive to the elution step, the binding capacity of the μIAC remained high enough to implement at least 15 consecutive analyses with the same column and in a fully automated way.
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Determination of uric acid and creatinine in human urine using hydrophilic interaction chromatography. Talanta 2011; 83:1707-10. [DOI: 10.1016/j.talanta.2010.11.073] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Accepted: 11/28/2010] [Indexed: 02/04/2023]
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14
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A nonenzymatic sensor for xanthine based on electrospun carbon nanofibers modified electrode. Talanta 2011; 83:1410-4. [DOI: 10.1016/j.talanta.2010.11.019] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2010] [Revised: 11/09/2010] [Accepted: 11/11/2010] [Indexed: 11/22/2022]
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Georgakopoulos CD, Lamari FN, Karathanasopoulou IN, Gartaganis VS, Pharmakakis NM, Karamanos NK. Tear analysis of ascorbic acid, uric acid and malondialdehyde with capillary electrophoresis. Biomed Chromatogr 2010; 24:852-7. [PMID: 20024890 DOI: 10.1002/bmc.1376] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Tears have a significant role in antioxidant defense in ocular tissues and since their collection is quick and noninvasive, their analysis would facilitate monitoring of pathophysiological changes. However, their low volume and low content of antioxidants makes analysis difficult; methods of high sensitivity are needed. In this paper, we present a method for tear analysis of two antioxidant molecules (ascorbic and uric acid) and of a lipid peroxidation indicator (malondialdehyde) with capillary electrophoresis. Tears were collected with Schirmer strips, extracted with a low-pH phosphate buffer, centrifuged through membrane filters and an antioxidant was added. They were stable at -70 degrees C for 15 days. After pilot experiments, optimum electrophoretic separation was achieved in a 25 mM borate buffer, pH 10.0, containing 100 mM sodium dodecyl sulfate at 25 degrees C and 20 kV. The developed method has good repeatability (<5% RSD), precision (<15% relative error values) and high sensitivity (LLOQ values of 20, 2.3 and 2.5 microM for ascorbate, urate and malondialdehyde, respectively). It was applied to the analysis of tears from healthy individuals and the antioxidant levels are in agreement with those obtained with other techniques. This method might serve as a tool to clarify the role of endogenous antioxidants in the pathophysiology of ocular diseases.
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Oh E, Hasan MN, Jamshed M, Park SH, Hong HM, Song EJ, Yoo YS. Growing trend of CE at the omics level: The frontier of systems biology. Electrophoresis 2010; 31:74-92. [DOI: 10.1002/elps.200900410] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Rapid and direct determination of creatinine in urine using capillary zone electrophoresis. Clin Chim Acta 2009; 409:52-5. [DOI: 10.1016/j.cca.2009.08.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 08/14/2009] [Accepted: 08/23/2009] [Indexed: 10/20/2022]
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Lee WH, Her GR. The development of a two-leveled two cross interface for on-line coupling solid-phase extraction and capillary electrophoresis-mass spectrometry. Electrophoresis 2009; 30:1675-83. [DOI: 10.1002/elps.200800709] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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20
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Almeda S, Arce L, Benavente F, Sanz-Nebot V, Barbosa J, Valcárcel M. Comparison of off- and in-line solid-phase extraction for enhancing sensitivity in capillary electrophoresis using ochratoxin as a model compound. Anal Bioanal Chem 2009; 394:609-15. [PMID: 19252901 DOI: 10.1007/s00216-009-2696-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2008] [Revised: 01/29/2009] [Accepted: 02/09/2009] [Indexed: 11/25/2022]
Abstract
This paper proposes and compares two approaches based on off- and in-line solid-phase extraction (SPE), intended to enhance sensitivity in capillary electrophoresis with ultraviolet detection (CE-UV) using as a model the determination of ochratoxin A (OA) in river water samples. In the off-line SPE mode, the reversed-phase sorbent (octadecilsylane, C(18)) selectively retains the target analyte (OA) and allows large volumes of the sample (70 mL) to be introduced and subsequently eluted in a small volume (0.1 mL) of an appropriate solution. In the in-line SPE mode, a custom-made microcartridge is inserted near the inlet of the capillary, which is filled with the same C(18) sorbent. This solid phase selectively retains OA present in a sample volume as low as approximately 640 microL for subsequent elution with ca. 135 nL of an appropriate eluent. The limit of detection (LOD) obtained with the in-line SPE method was 1 ng L(-1), which is 3 orders of magnitude lower than that obtained with CE-UV and roughly 1 order lower than that provided by the off-line SPE-CE-UV method.
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Affiliation(s)
- S Almeda
- Department of Analytical Chemistry, University of Córdoba, Campus de Rabanales, 14071, Córdoba, Spain
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Automated measurement of urinary creatinine by multichannel kinetic spectrophotometry. Anal Biochem 2009; 384:238-44. [DOI: 10.1016/j.ab.2008.10.015] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2008] [Revised: 10/06/2008] [Accepted: 10/07/2008] [Indexed: 11/18/2022]
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Salinas-Castillo A, Pastor I, Mallavia R, Mateo CR. Immobilization of a trienzymatic system in a sol–gel matrix: A new fluorescent biosensor for xanthine. Biosens Bioelectron 2008; 24:1059-62. [DOI: 10.1016/j.bios.2008.07.052] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2008] [Revised: 07/18/2008] [Accepted: 07/25/2008] [Indexed: 11/17/2022]
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Puig P, Tempels FWA, Somsen GW, de Jong GJ, Borrull F, Aguilar C, Calull M. Use of large-volume sample stacking in on-line solid-phase extraction-capillary electrophoresis for improved sensitivity. Electrophoresis 2008; 29:1339-46. [PMID: 18288781 DOI: 10.1002/elps.200700636] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We present a new system for the sensitive analysis of cephalosporins by CE using both on-line SPE and large-volume sample stacking (LVSS). Sample volumes of 250 muL were loaded onto the SPE microcolumn which was then desorbed with 426 nL of ACN. The SPE elution plug was injected into the CE system via an in-line valve interface filling approximately 60% of the volume of the separation capillary. Subsequently, LVSS was performed by applying a voltage of -5 kV, which resulted in the simultaneous removal of the elution solvent and the preconcentration of the analytes in a narrow zone. This way the amount of analyte loaded into the capillary could be considerably increased without serious loss of CE separation efficiency. LODs for cefoperazone and ceftiofur were in the ng/L range which represents an improvement of a factor of 8450 and 11 450 when compared with direct CE injection. The cephalosporin test compounds presented a good linear response (corrected peak area) between 0.5 and 10 mug/L with correlation coefficients higher than 0.995. The final method is compared with previously reported LVSS-CE and SPE-CE systems for the analysis of cephalosporins.
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Affiliation(s)
- Patricia Puig
- Department of Analytical Chemistry and Organic Chemistry, Faculty of Chemistry, Rovira i Virgili University, Tarragona, Spain.
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Morales-Cid G, Simonet BM, Cárdenas S, Valcárcel M. Electrical field-assisted solid-phase extraction coupled on-line to capillary electrophoresis-mass spectrometry. Electrophoresis 2008; 29:2033-40. [DOI: 10.1002/elps.200700565] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Puig P, Borrull F, Calull M, Aguilar C. Sorbent preconcentration procedures coupled to capillary electrophoresis for environmental and biological applications. Anal Chim Acta 2008; 616:1-18. [DOI: 10.1016/j.aca.2008.03.062] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2008] [Revised: 03/14/2008] [Accepted: 03/31/2008] [Indexed: 11/27/2022]
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26
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Jiménez JR, Luque de Castro MD. Lab-on-valve for the automatic determination of the total content and individual profiles of linear alkylbenzene sulfonates in water samples. Electrophoresis 2008; 29:590-6. [DOI: 10.1002/elps.200700361] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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