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Cutrim CS, Cortez MAS. A review on polyphenols: Classification, beneficial effects and their application in dairy products. INT J DAIRY TECHNOL 2018. [DOI: 10.1111/1471-0307.12515] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Camila Sampaio Cutrim
- Laboratory of Technology of Dairy Products; Food Technology Department; Faculty of Veterinary Medicine; Fluminense Federal University; 24230-340 Niterói Rio de Janeiro Brazil
| | - Marco Antonio Sloboda Cortez
- Laboratory of Technology of Dairy Products; Food Technology Department; Faculty of Veterinary Medicine; Fluminense Federal University; 24230-340 Niterói Rio de Janeiro Brazil
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2
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Ferey L, Delaunay N. Food Analysis on Electrophoretic Microchips. SEPARATION AND PURIFICATION REVIEWS 2015. [DOI: 10.1080/15422119.2015.1014049] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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3
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Martín A, López MÁ, González MC, Escarpa A. Multidimensional carbon allotropes as electrochemical detectors in capillary and microchip electrophoresis. Electrophoresis 2014; 36:179-94. [DOI: 10.1002/elps.201400328] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 08/22/2014] [Accepted: 08/22/2014] [Indexed: 12/29/2022]
Affiliation(s)
- Aída Martín
- Department of Analytical Chemistry; Physical Chemistry and Chemical Engineering; University of Alcalá; Madrid Spain
| | - Miguel Ángel López
- Department of Analytical Chemistry; Physical Chemistry and Chemical Engineering; University of Alcalá; Madrid Spain
| | - María Cristina González
- Department of Analytical Chemistry; Physical Chemistry and Chemical Engineering; University of Alcalá; Madrid Spain
| | - Alberto Escarpa
- Department of Analytical Chemistry; Physical Chemistry and Chemical Engineering; University of Alcalá; Madrid Spain
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Abstract
These insights attempt to share with the community the lights and shadows of one emerging and exciting topic, Food Microfluidics, defined as microfluidic technology for food analysis and diagnosis in important areas such as food safety and quality. The reader is invited to question non-easy interrogations such as why Food Microfluidics, what is the next step and what could we do with the available technology. This article invites food analysts to be seduced by this technology and then to take an interesting trip departing from the main gained achievements, having a look at the crossing bridges over Food Microfluidic challenges or having a look at available technology to start. Finally, this trip arrives at a privileged place to gaze the horizons. A wonderful landscape--full of inspiration--for Food Microfluidics is anticipated. These insights have also been written wishing to give improved conceptual and realistic solutions for food analysis, with the additional hope to attract the community with exciting technology, in order to get novel and unexpected achievements in this field.
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Affiliation(s)
- Alberto Escarpa
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Faculty of Chemistry, University of Alcalá E-28871, Ctra. Madrid-Barcelona km 33,600. 28871, Alcalá de Henares, Madrid, Spain.
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5
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Zhang Z, Yu L, Xu L, Hu X, Li P, Zhang Q, Ding X, Feng X. Biotoxin sensing in food and environment via microchip. Electrophoresis 2014; 35:1547-59. [PMID: 24723235 DOI: 10.1002/elps.201300570] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 02/21/2014] [Accepted: 03/20/2014] [Indexed: 12/23/2022]
Affiliation(s)
- Zhaowei Zhang
- Oil Crops Research Institute; Chinese Academy of Agricultural Sciences; Wuhan China
- Key Laboratory of Biology and Genetic Improvement of Oil Crops; Ministry of Agriculture; Wuhan China
| | - Li Yu
- Oil Crops Research Institute; Chinese Academy of Agricultural Sciences; Wuhan China
- Laboratory of Risk Assessment for Oilseeds Products (Wuhan); Ministry of Agriculture; Wuhan China
| | - Lin Xu
- Oil Crops Research Institute; Chinese Academy of Agricultural Sciences; Wuhan China
- Quality Inspection and Test Center for Oilseeds Products; Ministry of Agriculture; Wuhan China
| | - Xiaofeng Hu
- Oil Crops Research Institute; Chinese Academy of Agricultural Sciences; Wuhan China
- Key Laboratory of Detection for Mycotoxins; Ministry of Agriculture; Wuhan China
| | - Peiwu Li
- Oil Crops Research Institute; Chinese Academy of Agricultural Sciences; Wuhan China
- Key Laboratory of Biology and Genetic Improvement of Oil Crops; Ministry of Agriculture; Wuhan China
- Laboratory of Risk Assessment for Oilseeds Products (Wuhan); Ministry of Agriculture; Wuhan China
- Quality Inspection and Test Center for Oilseeds Products; Ministry of Agriculture; Wuhan China
- Key Laboratory of Detection for Mycotoxins; Ministry of Agriculture; Wuhan China
| | - Qi Zhang
- Oil Crops Research Institute; Chinese Academy of Agricultural Sciences; Wuhan China
- Key Laboratory of Biology and Genetic Improvement of Oil Crops; Ministry of Agriculture; Wuhan China
| | - Xiaoxia Ding
- Key Laboratory of Biology and Genetic Improvement of Oil Crops; Ministry of Agriculture; Wuhan China
- Laboratory of Risk Assessment for Oilseeds Products (Wuhan); Ministry of Agriculture; Wuhan China
| | - Xiaojun Feng
- Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics-Hubei Bioinformatics and Molecular Imaging Key Laboratory; Systems Biology Theme, Department of Biomedical Engineering, College of Life Science and Technology; Huazhong University of Science and Technology; Wuhan China
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6
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Moncada-Hernandez H, Nagler E, Minerick AR. Theoretical and experimental examination of particle-particle interaction effects on induced dipole moments and dielectrophoretic responses of multiple particle chains. Electrophoresis 2014; 35:1803-13. [DOI: 10.1002/elps.201300636] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 03/14/2014] [Accepted: 03/17/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Hector Moncada-Hernandez
- Biointeractive Systems and BioMEMS; Tecnológico de Monterrey; Campus Monterrey; Monterrey N.L. México
| | - Eliot Nagler
- MD-ERL; Michigan Technological University; Houghton MI USA
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7
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Schwarzkopf F, Scholl T, Ohla S, Belder D. Improving sensitivity in microchip electrophoresis coupled to ESI-MS/MS on the example of a cardiac drug mixture. Electrophoresis 2014; 35:1880-6. [DOI: 10.1002/elps.201300615] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 02/25/2014] [Accepted: 02/25/2014] [Indexed: 12/19/2022]
Affiliation(s)
| | - Tobias Scholl
- Institut für Analytische Chemie; Universität Leipzig; Leipzig Germany
| | - Stefan Ohla
- Institut für Analytische Chemie; Universität Leipzig; Leipzig Germany
| | - Detlev Belder
- Institut für Analytische Chemie; Universität Leipzig; Leipzig Germany
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8
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García M, Escarpa A. Microchip electrophoresis-copper nanowires for fast and reliable determination of monossacharides in honey samples. Electrophoresis 2013; 35:425-32. [PMID: 24115078 DOI: 10.1002/elps.201300458] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 09/20/2013] [Accepted: 09/21/2013] [Indexed: 12/22/2022]
Abstract
Microchip electrophoresis (ME) with electrochemical detection has been demonstrated to be a powerful tool in food analysis. However, the coupling of ME with electrochemical detection and nanotechnologies is still in its infancy, knowing that nanomaterials can significantly improve the ME analytical performance. This work reports the coupling between ME and copper nanowires (CuNWs) for the selective analysis of monosaccharides in honey samples. Also, in terms of real applicability, the study of analytical reliability of ME is an issue of paramount importance. To this end, a representative group of nine honey samples were analyzed and the results were compared with those previously obtained by HPLC-refractive index. ME-CuNWs approach allowed the separation of glucose and fructose in <250 s under optimized separation (20 mM NaOH + 10 mM H3 BO3 , pH 12; separation voltage + 1000 V) and detection (E = +0.70 V in 20 mM NaOH + 10 mM H3 BO3 , pH 12) conditions. An excellent stability of EOF during sample analysis was achieved with RSDs for migration times <2% and for amperometric currents <9%. The quantitative contents for individual glucose and fructose obtained using ME-CuNWs in comparison with those obtained by HPLC-refractive index were highly in agreement with errors <10% indicating the reliability of the approach. The excellent analytical performance obtained confirms the analytical potency of ME-CuNWs approach, enhancing the maturity of the microchip technology and opening new avenues for future implementation of applications in the field of food analysis.
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Affiliation(s)
- Miguel García
- Department of Analytical Chemistry, Physical Chemistry, and Chemical Engineering, Faculty of Chemistry, University of Alcalá, Alcalá de Henares, Madrid, Spain
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9
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Li S, Kiehne J, Sinoway LI, Cameron CE, Huang TJ. Microfluidic opportunities in the field of nutrition. LAB ON A CHIP 2013; 13:3993-4003. [PMID: 24056522 PMCID: PMC3875330 DOI: 10.1039/c3lc90090h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Nutrition has always been closely related to human health, which is a constant motivational force driving research in a variety of disciplines. Over the years, the rapidly emerging field of microfluidics has been pushing forward the healthcare industry with the development of microfluidic-based, point-of-care (POC) diagnostic devices. Though a great deal of work has been done in developing microfluidic platforms for disease diagnoses, potential microfluidic applications in the field of nutrition remain largely unexplored. In this Focus article, we would like to investigate the potential chances for microfluidics in the field of nutrition. We will first highlight some of the recent advances in microfluidic blood analysis systems that have the capacity to detect biomarkers of nutrition. Then we will examine existing examples of microfluidic devices for the detection of specific biomarkers of nutrition or nutrient content in food. Finally, we will discuss the challenges in this field and provide some insight into the future of applied microfluidics in nutrition.
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Affiliation(s)
- Sixing Li
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA. Fax: 814-865-9974; Tel: 814-863-4209;
- Cell and Developmental Biology (CDB) Graduate Program, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Justin Kiehne
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA. Fax: 814-865-9974; Tel: 814-863-4209;
| | - Lawrence I. Sinoway
- Heart and Vascular Institute and Department of Medicine, Penn State College of Medicine, and Milton S. Hershey Medical Center, Hershey, PA, 17033, USA
| | - Craig E. Cameron
- Cell and Developmental Biology (CDB) Graduate Program, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA 16802, USA
- Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA
| | - Tony Jun Huang
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA. Fax: 814-865-9974; Tel: 814-863-4209;
- Cell and Developmental Biology (CDB) Graduate Program, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA 16802, USA
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10
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11
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Poboży E, Filaber M, Koc A, Garcia-Reyes JF. Application of capillary electrophoretic chips in protein profiling of plant extracts for identification of genetic modifications of maize. Electrophoresis 2013; 34:2740-53. [DOI: 10.1002/elps.201300103] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Revised: 06/05/2013] [Accepted: 06/10/2013] [Indexed: 12/15/2022]
Affiliation(s)
- Ewa Poboży
- Department of Chemistry; University of Warsaw; Warsaw; Poland
| | - Monika Filaber
- Department of Chemistry; University of Warsaw; Warsaw; Poland
| | - Anna Koc
- Department of Chemistry; University of Warsaw; Warsaw; Poland
| | - Juan F. Garcia-Reyes
- Analytical Chemistry Research Group, Department of Physical and Analytical Chemistry; University of Jaén; Jaén; Spain
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12
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Castañeda R, Vilela D, González MC, Mendoza S, Escarpa A. SU-8/Pyrex microchip electrophoresis with integrated electrochemical detection for class-selective electrochemical index determination of phenolic compounds in complex samples. Electrophoresis 2013; 34:2129-35. [DOI: 10.1002/elps.201300060] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 03/19/2013] [Accepted: 03/19/2013] [Indexed: 11/06/2022]
Affiliation(s)
| | - Diana Vilela
- Departamento de Química Analítica; Química-Física e Ingeniería Química, Facultad de Química, Universidad de Alcalá; Alcalá de Henares; Madrid; España
| | - María Cristina González
- Departamento de Química Analítica; Química-Física e Ingeniería Química, Facultad de Química, Universidad de Alcalá; Alcalá de Henares; Madrid; España
| | - Sandra Mendoza
- Departamento de Investigación y Posgrado en Alimentos; Facultad de Química, Universidad Autónoma de Querétaro; Querétaro; Qro.; México
| | - Alberto Escarpa
- Departamento de Química Analítica; Química-Física e Ingeniería Química, Facultad de Química, Universidad de Alcalá; Alcalá de Henares; Madrid; España
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13
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Ansari K, Ying JYS, Hauser PC, de Rooij NF, Rodriguez I. A portable lab-on-a-chip instrument based on MCE with dual top-bottom capacitive coupled contactless conductivity detector in replaceable cell cartridge. Electrophoresis 2013; 34:1390-9. [DOI: 10.1002/elps.201200592] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 12/21/2012] [Accepted: 12/21/2012] [Indexed: 02/01/2023]
Affiliation(s)
- Kambiz Ansari
- Institute of Materials Research & Engineering; A*STAR (Agency for Science, Technology and Research); Singapore; Singapore
| | - Jasmine Yuen Shu Ying
- Institute of Materials Research & Engineering; A*STAR (Agency for Science, Technology and Research); Singapore; Singapore
| | - Peter C. Hauser
- Department of Chemistry; University of Basel; Basel; Switzerland
| | - Nico F. de Rooij
- Ecole Polytechnique Federale de Lausanne; Institute of Microengineering, Sensors; Actuators and Microsystems Laboratory Samlab; Neuchatel; Switzerland
| | - Isabel Rodriguez
- Institute of Materials Research & Engineering; A*STAR (Agency for Science, Technology and Research); Singapore; Singapore
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Lopez-de la Fuente MS, Moncada-Hernandez H, Perez-Gonzalez VH, Lapizco-Encinas BH, Martinez-Chapa SO. An electric stimulation system for electrokinetic particle manipulation in microfluidic devices. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:035103. [PMID: 23556848 DOI: 10.1063/1.4793559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Microfluidic devices have grown significantly in the number of applications. Microfabrication techniques have evolved considerably; however, electric stimulation systems for microdevices have not advanced at the same pace. Electric stimulation of micro-fluidic devices is an important element in particle manipulation research. A flexible stimulation instrument is desired to perform configurable, repeatable, automated, and reliable experiments by allowing users to select the stimulation parameters. The instrument presented here is a configurable and programmable stimulation system for electrokinetic-driven microfluidic devices; it consists of a processor, a memory system, and a user interface to deliver several types of waveforms and stimulation patterns. It has been designed to be a flexible, highly configurable, low power instrument capable of delivering sine, triangle, and sawtooth waveforms with one single frequency or two superimposed frequencies ranging from 0.01 Hz to 40 kHz, and an output voltage of up to 30 Vpp. A specific stimulation pattern can be delivered over a single time period or as a sequence of different signals for different time periods. This stimulation system can be applied as a research tool where manipulation of particles suspended in liquid media is involved, such as biology, medicine, environment, embryology, and genetics. This system has the potential to lead to new schemes for laboratory procedures by allowing application specific and user defined electric stimulation. The development of this device is a step towards portable and programmable instrumentation for electric stimulation on electrokinetic-based microfluidic devices, which are meant to be integrated with lab-on-a-chip devices.
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Affiliation(s)
- M S Lopez-de la Fuente
- Electrical and Computer Engineering, Tecnologico de Monterrey, Nuevo Leon 64849, Mexico.
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15
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Chua CK, Pumera M. Detection of silver nanoparticles on a lab-on-chip platform. Electrophoresis 2013; 34:2007-10. [DOI: 10.1002/elps.201200426] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Revised: 08/21/2012] [Accepted: 08/24/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Chun Kiang Chua
- Division of Chemistry & Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore
| | - Martin Pumera
- Division of Chemistry & Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore
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16
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Donato SS, Chu V, Prazeres DMF, Conde JP. Metabolic viability of Escherichia coli trapped by dielectrophoresis in microfluidics. Electrophoresis 2013; 34:575-82. [PMID: 23175163 DOI: 10.1002/elps.201200292] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 10/12/2012] [Accepted: 10/17/2012] [Indexed: 11/08/2022]
Abstract
The spatial and temporal control of biological species is essential in complex microfluidic biosystems. In addition, if the biological species is a cell, microfluidic handling must ensure that the cell's metabolic viability is maintained. The use of DEP for cell manipulation in microfluidics has many advantages because it is remote and fast, and the voltages required for cell trapping scale well with miniaturization. In this paper, the conditions for bacterial cell (Escherichia coli) trapping using a quadrupole electrode configuration in a PDMS microfluidic channel were developed both for stagnant and for in-flow fluidic situations. The effect of the electrical conductivity of the fluid, the applied electric field and frequency, and the fluid-flow velocity were studied. A dynamic exchange between captured and free-flowing cells during DEP trapping was demonstrated. The metabolic activity of trapped cells was confirmed by using E. coli cells genetically engineered to express green fluorescent protein under the control of an inducible promoter. Noninduced cells trapped by negative DEP and positive DEP were able to express green fluorescent protein minutes after the inducer was inserted in the microchannel system immediately after DEP trapping. Longer times of trapping prior to exposure to the inducer indicated first a degradation of the cell metabolic activity and finally cell death.
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Affiliation(s)
- Sandra S Donato
- INESC Microsistemas e Nanotecnologias and IN-Institute of Nanoscience and Nanotechnology, Lisbon, Portugal
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17
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Fernández-la-Villa A, Sánchez-Barragán D, Pozo-Ayuso DF, Castaño-Álvarez M. Smart portable electrophoresis instrument based on multipurpose microfluidic chips with electrochemical detection. Electrophoresis 2012; 33:2733-42. [PMID: 22965719 DOI: 10.1002/elps.201200236] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A second generation of a battery-powered portable electrophoresis instrument for the use of ME with electrochemical detection was developed. As the first-generation, the main unit of the instrument (150 mm × 165 mm × 95 mm) consists of four-outputs high-voltage power supply (HVPS) with maximum voltage of 3 KV and acquisition system (bipotentiostat) containing 2-channels for dual electrochemical detection. A new reusable microfluidic platform was designed in order to incorporate the microchips with the portable instrument. In this case, the platform is integrated to the main unit of the instrument so that it is not necessary to have any external cable for the interconnection of both parts, making the use of the complete system easier. The new platform contains all the electrical connections for the HVPS and bipotentiostat, as well as fluidic ports for driving the solutions. The microfluidic electrophoresis instrument is controlled by means of a user-friendly interface from a computer. The possibility of wireless connection (Bluetooth®) allows the use of the instrument without any external cable improving the portability. Therefore, the second generation brings a more compact and integrated electrophoresis instrument for "in situ" applications using microfluidic chips in an easy way. The performance of the electrophoresis system was initially evaluated using single- and dual-channel SU-8/Pyrex microchips with different models of integrated electrodes including microelectrodes and interdigitated arrays. The method was tested in different analytical applications such as separation of neurotransmitters, chlorophenols, purine derivatives, vitamins, polyphenolic acids, and flavones.
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Martín A, Vilela D, Escarpa A. Food analysis on microchip electrophoresis: an updated review. Electrophoresis 2012; 33:2212-27. [PMID: 22887146 DOI: 10.1002/elps.201200049] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
From 2008 to date, basically, single-cross microchip electrophoresis (ME) design has been used for food analysis with electrochemical and laser-induced fluorescence detection being the most common principles coupled. In the last 4 years, the main outlines were: (i) the exploration of new analytes such as heavy metals, nitrite, micotoxins, microorganisms, and allergens; (ii) the development of electrokinetic microfluidic (bio-) sensors into microchip format for the detection of toxins; and interestingly (iii) although sample preparation is still performed off-chip, an important increase in works dealing with complicated food samples has been clearly noticed. Although microchip technology based on electrokinetics is emerging from important fields such as authentication of foods, detection of frauds, toxics, and allergens; the marriage between micro- and nanotechnologies and total integration approaches has not reached the expected impact in the field but it is still a great promise for the development of ME of new generations for food analysis.
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Affiliation(s)
- Aida Martín
- Department of Analytical Chemistry and Chemical Engineering, University of Alcalá, Madrid, Spain
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19
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Ding Y, Bai L, Suo X, Meng X. Post separation adjustment of pH to enable the analysis of aminoglycoside antibiotics by microchip electrophoresis with amperometric detection. Electrophoresis 2012; 33:3245-53. [DOI: 10.1002/elps.201200309] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 07/28/2012] [Accepted: 07/30/2012] [Indexed: 01/19/2023]
Affiliation(s)
- Yongsheng Ding
- College of Life Sciences; Graduate University of Chinese Academy of Sciences; Beijing; China
| | - Liang Bai
- College of Life Sciences; Graduate University of Chinese Academy of Sciences; Beijing; China
| | - Xingmei Suo
- School of Information Engineering; Minzu University of China; Beijing; China
| | - Xiangying Meng
- College of Life Sciences; Graduate University of Chinese Academy of Sciences; Beijing; China
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Sierra-Rodero M, Fernández-Romero JM, Gómez-Hens A. Determination of aminoglycoside antibiotics using an on-chip microfluidic device with chemiluminescence detection. Mikrochim Acta 2012. [DOI: 10.1007/s00604-012-0878-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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21
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Vilela D, Ansón-Casaos A, Martínez MT, González MC, Escarpa A. High NIR-purity index single-walled carbon nanotubes for electrochemical sensing in microfluidic chips. LAB ON A CHIP 2012; 12:2006-2014. [PMID: 22532124 DOI: 10.1039/c2lc40099e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Single-walled carbon nanotubes (SWCNTs) should constitute an important natural step towards the improvement of the analytical performance of microfluidic electrochemical sensing. SWCNTs inherently offer lower detection potentials, higher surfaces and better stability than the existing carbon electrodes. However, pristine SWCNTs contain some carbonaceous and metallic impurities that influence their electrochemical performance. Thus, an appropriate processing method is important for obtaining high purity SWCNTs for analytical applications. In this work, a set of 0.1 mg mL(-1) SWCNT dispersions with different degrees of purity and different dispersants (SDBS; pluronic F68 and DMF) was carefully characterized by near infrared (NIR) spectroscopy giving a Purity Index (NIR-PI) ranging from 0.039 to 0.310. The highest purity was obtained when air oxidized SWCNTs were dispersed in SDBS, followed by centrifugation. The SWCNT dispersions were utilized to modify microfluidic chip electrodes for the electrochemical sensing of dopamine and catechol. In comparison with non-SWCNT-based electrodes, the sample with the highest NIR-PI (0.310) exhibited the best analytical performance in terms of improved sensitivity (3-folds higher), very good signal-to-noise ratio, high resistance-to-fouling in terms of relative standard deviation (RSD 7%; n = 15), and enhanced resolution (2-folds higher). In addition, very well-defined concentration dependence was also obtained with excellent correlation coefficients (r ≥ 0.990). Likewise, a good analytical sensitivity, suitable detection limits (LODs) and a very good precision with independence of the concentration assayed (RSDs ≤ 5%) was achieved. These valuable features indicate the suitability of this material for quantitative analysis. NIR-PI and further TEM and XRD characterization demonstrated that the analytical response was driven and controlled by the high NIR-PI of the SWCNTs used. The significance of this work is the demonstration for the first time of the sensitivity-purity relationship in SWCNT microfluidic chips. A novel and valuable analytical tool for electrochemical sensing has been developed: SWCNTs with high purity and a rich surface chemistry with functional groups, both essential for analytical purposes. Also, this work helps to better understand the analytical potency of SWCNTs coupled to microfluidic chips and it opens new gates for using these unique dispersions in real-world applications.
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Affiliation(s)
- Diana Vilela
- Departamento de Química Analítica e Ingeniería Química, Edificio Polivalente, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
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23
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Ellis DI, Brewster VL, Dunn WB, Allwood JW, Golovanov AP, Goodacre R. Fingerprinting food: current technologies for the detection of food adulteration and contamination. Chem Soc Rev 2012; 41:5706-27. [DOI: 10.1039/c2cs35138b] [Citation(s) in RCA: 296] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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24
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Gubala V, Harris LF, Ricco AJ, Tan MX, Williams DE. Point of Care Diagnostics: Status and Future. Anal Chem 2011; 84:487-515. [DOI: 10.1021/ac2030199] [Citation(s) in RCA: 832] [Impact Index Per Article: 64.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Vladimir Gubala
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
| | - Leanne F. Harris
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
| | - Antonio J. Ricco
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
| | - Ming X. Tan
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
| | - David E. Williams
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
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25
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Rabanes HR, Guidote AM, Quirino JP. Capillary electrophoresis of natural products: Highlights of the last five years (2006-2010). Electrophoresis 2011; 33:180-95. [DOI: 10.1002/elps.201100223] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 09/22/2011] [Accepted: 09/22/2011] [Indexed: 12/14/2022]
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Abstract
The safety of the food supply is a subject of intense interest to consumers, particularly as a result of large-scale outbreaks that involve hundreds and sometimes thousands of consumers. During the last decade, this concern about food safety has expanded to include the diets of companion animals as a result of several incidences of chemical toxicities and infectious disease transmission. This has led to increased research into the causes and controls for these hazards for both companion animals and their owners. The following summary provides an introduction to the issues, challenges and new tools being developed to ensure that commercial pet foods are both nutritious and safe.
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Bachmann S, Bakry R, Huck CW, Polato F, Corradini D, Bonn GK. Peptide mapping using capillary electrophoresis offline coupled to matrix-assisted laser desorption ionization time of flight mass spectrometry. Electrophoresis 2011; 32:2830-9. [PMID: 21953317 DOI: 10.1002/elps.201000653] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Revised: 03/14/2011] [Accepted: 03/14/2011] [Indexed: 01/20/2023]
Abstract
This article reports the results of a study carried out to evaluate the offline hyphenation of capillary zone electrophoresis with matrix-assisted lased desorption ionization time of flight mass spectrometry (MALDI-TOF-MS) for the analysis of low-abundant complex samples, represented by the tryptic phosphorylated peptides of phosphoproteins, such as α-casein, β-casein, and fetuin. The proposed method employs a latex-coated capillary and consists in the online preconcentration of the tryptic peptides by a pH-mediated stacking method, their separation by capillary zone electrophoresis, and subsequent deposition of the separated analytes onto a MALDI target for their MS analysis. The online preconcentration method allows loading a large sample volume (∼150 nL), which is introduced into the capillary after the hydrodynamic injection of a short plug of 1.0 M ammonium hydroxide solution and is sandwiched between two plugs of the acidic background electrolyte solution (BGE) filling the capillary. The sample spotting of the separated analytes onto the MALDI target is performed either during or postseparation using an automatic spotting device connected to the exit of the separation capillary. The proposed method allows the separation and identification of multiphosphorylated peptides from other peptides and enables their identification at femtomole level with improved efficiency compared with LC approaches hyphenated to MS.
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Affiliation(s)
- Stefan Bachmann
- Institute of Analytical Chemistry and Radiochemistry, Leopold-Franzens University, Innsbruck, Austria
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29
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A simple and compact blue diode laser powered excitation source for fluorescence detection in capillary electrochromatographic microchip separation. Microchem J 2011. [DOI: 10.1016/j.microc.2011.04.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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30
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Jesús-Pérez NM, Lapizco-Encinas BH. Dielectrophoretic monitoring of microorganisms in environmental applications. Electrophoresis 2011; 32:2331-57. [PMID: 21823133 DOI: 10.1002/elps.201100107] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Revised: 04/14/2011] [Accepted: 04/15/2011] [Indexed: 12/28/2022]
Affiliation(s)
- Nadia M Jesús-Pérez
- Centro de Investigación y de Estudios Avanzados del IPN Unidad Monterrey, Apodaca, Nuevo Leon, México
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31
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32
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Mir M, Martínez-Rodríguez S, Castillo-Fernández O, Homs-Corbera A, Samitier J. Electrokinetic techniques applied to electrochemical DNA biosensors. Electrophoresis 2011; 32:811-21. [DOI: 10.1002/elps.201000487] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Revised: 11/05/2010] [Accepted: 11/07/2010] [Indexed: 11/10/2022]
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33
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Dossi N, Toniolo R, Pizzariello A, Susmel S, Bontempelli G. A modified electrode for the electrochemical detection of biogenic amines and their amino acid precursors separated by microchip capillary electrophoresis. Electrophoresis 2011; 32:906-12. [DOI: 10.1002/elps.201000690] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 01/12/2011] [Accepted: 01/13/2011] [Indexed: 11/08/2022]
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34
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Hervás M, López MA, Escarpa A. Integrated electrokinetic magnetic bead-based electrochemical immunoassay on microfluidic chips for reliable control of permitted levels of zearalenone in infant foods. Analyst 2011; 136:2131-8. [PMID: 21394379 DOI: 10.1039/c1an15081b] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Microfluidic technology has now become a novel sensing platform where different analytical steps, biological recognition materials and suitable transducers can be cleverly integrated yielding a new sensor generation. A novel "lab-on-a-chip" strategy integrating an electrokinetic magnetic bead-based electrochemical immunoassay on a microfluidic chip for reliable control of permitted levels of zearalenone in infant foods is proposed. The strategy implies the creative use of the simple channel layout of the double-T microchip to perform sequentially the immunointeraction and enzymatic reaction by applying a program of electric fields suitably connected to the reservoirs for driving the fluidics at different chambers in order to perform the different reactions. Both zones are used with the aid of a magnetic field to avoid in a very simple and elegant way the non-specific adsorption. Immunological reaction is performed under a competitive enzyme-linked immunosorbent assay (ELISA) where the mycotoxin ZEA and an enzyme-labelled derivative compete for the binding sites of the specific monoclonal antibody immobilised onto protein G modified magnetic beads. Horseradish peroxidase (HRP), in the presence of hydrogen peroxide, catalyses the oxidation of hydroquinone (HQ) to benzoquinone (BQN), whose back electrochemical reduction was detected at +0.1 V. Controlled-electrokinetic fluidic handling optimized conditions are addressed for all analytical steps cited above, and allows performing the complete immunoassay for the target ZEA analyte in less than 15 minutes with unique analytical merits: competitive immunoassay currents showed a very well-defined concentration dependence with a good precision as well as a suitable limit of detection of 0.4 µg L(-1), well below the legislative requirements, and an extremely low systematic error of 2% from the analysis of a maize certified reference material revealing additionally an excellent accuracy. Also, the reliability of the approach is demonstrated by the analysis of selected infant foods yielding the strictest ZEA permitted levels and excellent recoveries of 103 and 101% for solid and liquid samples, respectively.
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Affiliation(s)
- Mirian Hervás
- Department of Analytical Chemistry and Chemical Engineering, Faculty of Chemistry, Alcala University, Alcala de Henares, Madrid, Spain
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35
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Nanoparticle-based electrochemical detection in conventional and miniaturized systems and their bioanalytical applications: A review. Anal Chim Acta 2011; 690:10-25. [DOI: 10.1016/j.aca.2011.01.054] [Citation(s) in RCA: 109] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 01/26/2011] [Accepted: 01/27/2011] [Indexed: 01/04/2023]
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36
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Bergamo AB, Fracassi da Silva JA, de Jesus DP. Simultaneous determination of aspartame, cyclamate, saccharin and acesulfame-K in soft drinks and tabletop sweetener formulations by capillary electrophoresis with capacitively coupled contactless conductivity detection. Food Chem 2011. [DOI: 10.1016/j.foodchem.2010.07.107] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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37
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Review: Authentication and traceability of foods from animal origin by polymerase chain reaction-based capillary electrophoresis. Anal Chim Acta 2011; 685:120-6. [DOI: 10.1016/j.aca.2010.11.021] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 11/10/2010] [Accepted: 11/10/2010] [Indexed: 11/19/2022]
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38
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Chip electrophoresis of active banana ingredients with label-free detection utilizing deep UV native fluorescence and mass spectrometry. Anal Bioanal Chem 2010; 399:1853-7. [DOI: 10.1007/s00216-010-4557-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 11/11/2010] [Accepted: 12/01/2010] [Indexed: 10/18/2022]
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39
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Vallejo-Cordoba B, González-Córdova AF. Capillary electrophoresis for the analysis of contaminants in emerging food safety issues and food traceability. Electrophoresis 2010; 31:2154-64. [PMID: 20593390 DOI: 10.1002/elps.200900777] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
This review presents an overview of the applicability of CE in the analysis of chemical and biological contaminants involved in emerging food safety issues. Additionally, CE-based genetic analyzers' usefulness as a unique tool in food traceability verification systems was presented. First, analytical approaches for the determination of melamine and specific food allergens in different foods were discussed. Second, natural toxin analysis by CE was updated from the last review reported in 2008. Finally, the analysis of prion proteins associated with the "mad cow" crises and the application of CE-based genetic analyzers for meat traceability were summarized.
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Affiliation(s)
- Belinda Vallejo-Cordoba
- Laboratorio de Calidad, Autenticidad y Trazabilidad de los Alimentos, Centro de Investigación en Alimentación y Desarrollo, A. C. (CIAD), Sonora, Mexico.
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40
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Dossi N, Toniolo R, Susmel S, Pizzariello A, Bontempelli G. A simple approach to the hydrodynamic injection in microchip electrophoresis with electrochemical detection. Electrophoresis 2010; 31:2541-7. [DOI: 10.1002/elps.201000089] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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41
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Fernández-la-Villa A, Pozo-Ayuso DF, Castaño-Álvarez M. New analytical portable instrument for microchip electrophoresis with electrochemical detection. Electrophoresis 2010; 31:2641-9. [DOI: 10.1002/elps.201000100] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Kovachev N, Canals A, Escarpa A. Fast and selective microfluidic chips for electrochemical antioxidant sensing in complex samples. Anal Chem 2010; 82:2925-31. [PMID: 20210324 DOI: 10.1021/ac9029218] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, capillary electrophoresis chips with electrochemical detection have been assessed as creative and selective microfluidic platforms to integrate and simplify on a microscale the traditional methods for complex natural antioxidants determination. Depending on the acid-base properties of the analytes, two approaches (class-selective electrochemical index determination (CSEID) and individual antioxidant determination (IAD)) were investigated for the analysis of nine antioxidants ((+)-catechin, rutin, quercetin, chlorogenic, ferulic, caffeic, protocatechuic, vanillic, and gallic acids) in food samples. First, the novel concept of a class-selective electrochemical index is proposed allowing a fast and reliable determination of the main antioxidant classes (flavonoids and phenolic acids) in less than 100 s. In addition, an impressive separation of nine antioxidants is also offered in less than 260 s with the individual antioxidant determination approach. Qualitative and quantitative performances of both approaches were studied. The analytical figures of merit (i.e., electroosmotic flow (EOF) precision as relative standard deviation (RSD), resolution, signal precision as RSD, limit of detection, limit of quantification, and accuracy as recovery) of both approaches were <4%, approximately 1, < or = 5%, <8 microM, 30 microM, between 91% and 104%, and <4%, < or = 2%, <9%, < or = 6 microM, < or = 20 microM (with the exception of protocatechuic acid, which shows values of 40 and 130 microM, respectively), between 80% and 107% for the CSEID and IAD concepts, respectively, which are excellent for food samples analysis. A set of representative samples was analyzed including apple and pear skins and pulps, red and white wines, and green tea tablets. High agreement was observed between the results of the sample analyses from the two microchip-based approaches, and good correlation was observed with results obtained from traditional methods. Although the prominent phenolic antioxidant classes and compounds were successfully determined, some nonprominent peaks were not detected in the samples when applying the IAD approach. Different integration strategies on microchip platforms were further explored, looking for a simplification of the overall analytical process without losing the excellent analytical characteristics obtained in both approaches. The results are promising and indicative of the progress of analytical microfluidics toward the "plateau of productivity" and the routine laboratory application.
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Affiliation(s)
- Nikolay Kovachev
- Department of Analytical Chemistry and Chemical Engineering, University of Alcalá, E-28871 Alcalá de Henares, Madrid, Spain
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43
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Borecki M, Korwin-Pawlowski ML, Beblowska M, Szmidt J, Jakubowski A. Optoelectronic capillary sensors in microfluidic and point-of-care instrumentation. SENSORS (BASEL, SWITZERLAND) 2010; 10:3771-97. [PMID: 22319325 PMCID: PMC3274246 DOI: 10.3390/s100403771] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Revised: 03/10/2010] [Accepted: 03/30/2010] [Indexed: 11/17/2022]
Abstract
This paper presents a review, based on the published literature and on the authors' own research, of the current state of the art of fiber-optic capillary sensors and related instrumentation as well as their applications, with special emphasis on point-of-care chemical and biochemical sensors, systematizing the various types of sensors from the point of view of the principles of their construction and operation. Unlike classical fiber-optic sensors which rely on changes in light propagation inside the fiber as affected by outside conditions, optical capillary sensors rely on changes of light transmission in capillaries filled with the analyzed liquid, which opens the possibility of interesting new applications, while raising specific issues relating to the construction, materials and instrumentation of those sensors.
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Affiliation(s)
- Michał Borecki
- Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland; E-Mails: (M.B.); (J.S.); (A.J.)
| | - Michael L. Korwin-Pawlowski
- Département d’informatique et d’ingénierie, Université du Québec en Outaouais, 101 rue Saint-Jean-Bosco, Gatineau, QC J8X 3X7, Canada; E-Mail:
| | - Maria Beblowska
- Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland; E-Mails: (M.B.); (J.S.); (A.J.)
| | - Jan Szmidt
- Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland; E-Mails: (M.B.); (J.S.); (A.J.)
| | - Andrzej Jakubowski
- Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland; E-Mails: (M.B.); (J.S.); (A.J.)
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44
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Gallo-Villanueva RC, Rodríguez-López CE, Díaz-de-la-Garza RI, Reyes-Betanzo C, Lapizco-Encinas BH. DNA manipulation by means of insulator-based dielectrophoresis employing direct current electric fields. Electrophoresis 2010; 30:4195-205. [PMID: 20013902 DOI: 10.1002/elps.200900355] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Electrokinetic techniques offer a great potential for biological particle manipulation. Among these, dielectrophoresis (DEP) has been successfully utilized for the concentration of bioparticles. Traditionally, DEP is performed employing microelectrodes, an approach with attractive characteristics but expensive due to microelectrode fabrication costs. An alternative is insulator-based DEP, a method where non-uniform electric fields are created with arrays of insulating structures. This study presents the concentration of linear DNA particles (pET28b) employing a microchannel, with an array of cylindrical insulating structures and direct current electric fields. Results showed manipulation of DNA particles with a combination of electroosmotic, electrophoretic, and dielectrophoretic forces. Employing suspending media with conductivity of 104 muS/cm and pH of 11.15, under applied fields between 500 and 1500 V/cm, DNA particles were observed to be immobilized due to negative dielectrophoretic trapping. The observation of DNA aggregates that occurred at higher applied fields, and dispersed once the field was removed is also included. Finally, concentration factors varying from 8 to 24 times the feed concentration were measured at 2000 V/cm after concentration time-periods of 20-40 s. The results presented here demonstrate the potential of insulator-based DEP for DNA concentration, and open the possibility for fast DNA manipulation for laboratory and large-scale applications.
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Affiliation(s)
- Roberto C Gallo-Villanueva
- Departamento de Biotecnología e Ingeniería de Alimentos y Centro de Biotecnología, Tecnológico de Monterrey, Monterrey, Nuevo León, México
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45
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Herrero M, García-Cañas V, Simo C, Cifuentes A. Recent advances in the application of capillary electromigration methods for food analysis and Foodomics. Electrophoresis 2010; 31:205-28. [PMID: 19967713 DOI: 10.1002/elps.200900365] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The use of capillary electromigration methods to analyze foods and food components is reviewed in this work. Papers that were published during the period April 2007 to March 2009 are included following the previous review by García-Cañas and Cifuentes (Electrophoresis, 2008, 29, 294-309). These works include the analysis of amino acids, biogenic amines, peptides, proteins, DNAs, carbohydrates, phenols, polyphenols, pigments, toxins, pesticides, vitamins, additives, small organic and inorganic ions and other compounds found in foods and beverages, as well as those applications of CE for monitoring food interactions and food processing. The use of microchips, CE-MS, chiral-CE as well as other foreseen trends in food analysis are also discussed including their possibilities in the very new field of Foodomics.
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Affiliation(s)
- Miguel Herrero
- Departamento de Caracterización de Alimentos, Instituto de Fermentaciones Industriales, Madrid 28006, Spain
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46
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Tran NT, Ayed I, Pallandre A, Taverna M. Recent innovations in protein separation on microchips by electrophoretic methods: An update. Electrophoresis 2010; 31:147-73. [DOI: 10.1002/elps.200900465] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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47
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Asensio-Ramos M, Hernández-Borges J, Rocco A, Fanali S. Food analysis: A continuous challenge for miniaturized separation techniques. J Sep Sci 2009; 32:3764-800. [DOI: 10.1002/jssc.200900321] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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48
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Merola ET, Catherman AD, Yehl JB, Strein TG. Determination of total antioxidant capacity of commercial beverage samples by capillary electrophoresis via inline reaction with 2,6-dichlorophenolindophenol. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2009; 57:6518-23. [PMID: 19572646 PMCID: PMC2737068 DOI: 10.1021/jf901214r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This paper demonstrates proof-of-concept for the use of electrophoretically mediated microanalysis (EMMA) as a new approach to the determination of total antioxidant capacity (TAC). EMMA is a low-volume, high-efficiency capillary electrophoretic technique that has to date been underutilized for small molecule reactions. Here, nanoliter volumes of 2,6-dichlorophenolindophenol (DCIP) reagent solution are mixed with an antioxidant-containing sample within the confines of a narrow-bore capillary tube. The mixing is accomplished by exploiting differential migration rates of the reagents when a voltage field is applied across the length of the capillary tube. The ensuing electron transfer reaction between DCIP and the antioxidant(s) is then used as a quantitative measure of the TAC of the sample. Linear calibration using either redox form of DCIP is accomplished with standard solutions of ascorbic acid. Several commercial beverage samples are analyzed, and the TAC values obtained with the reported methodology are compared to results obtained with the widely used ferric reducing antioxidant power (FRAP) spectroscopic method. For the analysis of real samples of unknown ionic strength, the method of standard additions is shown to be superior to the use of external calibration. This easily automated EMMA method may represent a useful new approach to TAC determination.
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Affiliation(s)
| | | | - Jenna B. Yehl
- Department of Chemistry, Bucknell University, Lewisburg, PA 17837, Phone: (570) 577-1641, FAX: (570) 577-1739,
| | - Timothy G. Strein
- Department of Chemistry, Bucknell University, Lewisburg, PA 17837, Phone: (570) 577-1641, FAX: (570) 577-1739,
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49
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Characterization of electrokinetic mobility of microparticles in order to improve dielectrophoretic concentration. Anal Bioanal Chem 2009; 394:293-302. [PMID: 19190896 DOI: 10.1007/s00216-009-2626-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2008] [Revised: 01/14/2009] [Accepted: 01/15/2009] [Indexed: 10/21/2022]
Abstract
Insulator-based dielectrophoresis (iDEP), an efficient technique with great potential for miniaturization, has been successfully applied for the manipulation of a wide variety of bioparticles. When iDEP is applied employing direct current (DC) electric fields, other electrokinetic transport mechanisms are present: electrophoresis and electroosmotic flow. In order to concentrate particles, iDEP has to overcome electrokinetics. This study presents the characterization of electrokinetic flow under the operating conditions employed with iDEP; in order to identify the optimal conditions for particle concentration employing DC-iDEP, microparticle image velocimetry (microPIV) was employed to measure the velocity of 1-microm-diameter inert polystyrene particles suspended inside a microchannel made from glass. Experiments were carried out by varying the properties of the suspending medium (conductivity from 25 to 100 microS/cm and pH from 6 to 9) and the strength of the applied electric field (50-300 V/cm); the velocities values obtained ranged from 100 to 700 microm/s. These showed that higher conductivity and lower pH values for the suspending medium produced the lowest electrokinetic flow, improving iDEP concentration of particles, which decreases voltage requirements. These ideal conditions for iDEP trapping (pH = 6 and sigma(m) = 100 microS/cm) were tested experimentally and with the aid of mathematical modeling. The microPIV measurements allowed obtaining values for the electrokinetic mobilities of the particles and the zeta potential of the glass surface; these values were used with a mathematical model built with COMSOL Multiphysics software in order to predict the dielectrophoretic and electrokinetic forces exerted on the particles; the modeling results confirmed the microPIV findings. Experiments with iDEP were carried out employing the same microparticles and a glass microchannel that contained an array of cylindrical insulating structures. By applying DC electric fields across the insulating structures array, it was seen that the dielectrophoretic trapping was improved when the electrokinetic force was the lowest; as predicted by microPIV measurements and the mathematical model. The results of this study provide guidelines for the selection of optimal operating conditions for improving insulator-based dielectrophoretic separations and have the potential to be extended to bioparticle applications.
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50
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Hervás M, López MÁ, Escarpa A. Electrochemical microfluidic chips coupled to magnetic bead-based ELISA to control allowable levels of zearalenone in baby foods using simplified calibration. Analyst 2009; 134:2405-11. [DOI: 10.1039/b911839j] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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