1
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Pu L. Chemoselective and Enantioselective Fluorescent Identification of Specific Amino Acid Enantiomers. Chem Commun (Camb) 2022; 58:8038-8048. [DOI: 10.1039/d2cc02363f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enantiomers of chiral amino acids play versatile roles in biological systems including humans. They are also very useful in the asymmetric synthesis of diverse chiral organic compounds. Therefore, identification...
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2
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Capillary and microchip electrophoresis with contactless conductivity detection for analysis of foodstuffs and beverages. Food Chem 2021; 375:131858. [PMID: 34923397 DOI: 10.1016/j.foodchem.2021.131858] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 11/29/2021] [Accepted: 12/10/2021] [Indexed: 12/17/2022]
Abstract
The paper provides a comprehensive survey of the use of capillary and microchip electrophoresis in combination with contactless conductivity detection (C4D) for the analysis of drinking water, beverages and foodstuffs. The introduction sets forth the fundamentals of conductivity detection anddescribes an axialC4Dversion. There is also a detailed discussion of the determination of inorganic ions, organic acids, fatty acids, amino acids, amines, carbohydrates, foreign substances and poisons from the standpoint of separation conditions, sample treatment and detection limits. Special attention is paid to the analysis of foodstuffs at microchips with emphasis on the employed material and connection of the microchip with the C4D. The review attempts to draw attention to modern trends, such as dual-opposite injection, field-enhanced sample injection, electromembrane extraction and on-line combination of microdialysis with CE. CE/C4D is characterised by high universality, high speed of analysis, simple sample preparation, small consumption of sample and other chemicals.
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3
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Twenty years of amino acid determination using capillary electrophoresis: A review. Anal Chim Acta 2021; 1174:338233. [DOI: 10.1016/j.aca.2021.338233] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 01/14/2021] [Accepted: 01/16/2021] [Indexed: 12/28/2022]
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4
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de Koster N, Clark CP, Kohler I. Past, present, and future developments in enantioselective analysis using capillary electromigration techniques. Electrophoresis 2021; 42:38-57. [PMID: 32914880 PMCID: PMC7821218 DOI: 10.1002/elps.202000151] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 08/22/2020] [Accepted: 09/08/2020] [Indexed: 12/16/2022]
Abstract
Enantioseparation of chiral products has become increasingly important in a large diversity of academic and industrial applications. The separation of chiral compounds is inherently challenging and thus requires a suitable analytical technique that can achieve high resolution and sensitivity. In this context, CE has shown remarkable results so far. Chiral CE offers an orthogonal enantioselectivity and is typically considered less costly than chromatographic techniques, since only minute amounts of chiral selectors are needed. Several CE approaches have been developed for chiral analysis, including chiral EKC and chiral CEC. Enantioseparations by EKC benefit from the wide variety of possible pseudostationary phases that can be employed. Chiral CEC, on the other hand, combines chromatographic separation principles with the bulk fluid movement of CE, benefitting from reduced band broadening as compared to pressure-driven systems. Although UV detection is conventionally used for these approaches, MS can also be considered. CE-MS represents a promising alternative due to the increased sensitivity and selectivity, enabling the chiral analysis of complex samples. The potential contamination of the MS ion source in EKC-MS can be overcome using partial-filling and counter-migration techniques. However, chiral analysis using monolithic and open-tubular CEC-MS awaits additional method validation and a dedicated commercial interface. Further efforts in chiral CE are expected toward the improvement of existing techniques, the development of novel pseudostationary phases, and establishing the use of chiral ionic liquids, molecular imprinted polymers, and metal-organic frameworks. These developments will certainly foster the adoption of CE(-MS) as a well-established technique in routine chiral analysis.
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Affiliation(s)
- Nicky de Koster
- Leiden Academic Centre for Drug Research, Division of Systems Biomedicine and PharmacologyLeiden UniversityLeidenThe Netherlands
| | - Charles P. Clark
- Leiden Academic Centre for Drug Research, Division of Systems Biomedicine and PharmacologyLeiden UniversityLeidenThe Netherlands
| | - Isabelle Kohler
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute for Molecular and Life SciencesVrije Universiteit AmsterdamAmsterdamThe Netherlands
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Anzardi MB, Arancibia JA. Chemometrics-assisted liquid chromatographic determination of quinolones in edible animal tissues. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Ikkere LE, Perkons I, Pugajeva I, Gruzauskas R, Bartkiene E, Bartkevics V. Direct injection Fourier transform ion cyclotron resonance mass spectrometric method for high throughput quantification of quinolones in poultry. J Pharm Biomed Anal 2020; 188:113389. [PMID: 32512256 DOI: 10.1016/j.jpba.2020.113389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 05/21/2020] [Accepted: 05/21/2020] [Indexed: 10/24/2022]
Abstract
Many recent studies have shown high detection frequencies of quinolone antibiotics in poultry, as well as an increasing incidence of antimicrobial resistance. The main purpose of this project was to develop a fast and reliable analytical method for the detection of quinolones in poultry meat. In order to develop a rapid quantitative confirmation method, ion cyclotron resonance mass spectrometer was used. First, the sample preparation procedure was simplified by reducing the procedure to extraction and freezing out steps. Second, the chromatographic separation step was excluded and mass spectrometric parameters were optimised. Third, the method was validated by fortifying a blank matrix at four levels (0.5, 1, 1.5, and 2 times the maximum residue limit (MRL) or level of interest in those cases when no MRL was established). As a result, the overall analysis time was reduced to less than an hour. The validation study revealed that the method is capable of detection and confirmation of ten quinolone compounds in poultry above the detection capability (CCβ) of the procedure. Finally, the developed method was applied to 19 commercially available chicken meat samples. None of the samples contained quinolones above the limit of quantification (LOQ) of the method. Analysis of treated chickens revealed that the developed method is suitable for the determination of ciprofloxacin and enrofloxacin. The developed method could be one of the fastest quantitative confirmatory methods for the analysis of quinolones available so far.
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Affiliation(s)
- L E Ikkere
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes Str. 3, Riga, LV-1076, Latvia.
| | - I Perkons
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes Str. 3, Riga, LV-1076, Latvia
| | - I Pugajeva
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes Str. 3, Riga, LV-1076, Latvia
| | - R Gruzauskas
- Kaunas University of Technology, Radvilenu Rd. 19, Kaunas, LT-50254, Lithuania
| | - E Bartkiene
- Lithuanian University of Health Sciences, Tilzes Str. 18, Kaunas, LT-47181, Lithuania
| | - V Bartkevics
- Institute of Food Safety, Animal Health and Environment "BIOR", Lejupes Str. 3, Riga, LV-1076, Latvia
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8
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Daniel D, do Lago CL. Determination of Multiclass Pesticides Residues in Corn by QuEChERS and Capillary Electrophoresis Tandem Mass Spectrometry. FOOD ANAL METHOD 2019. [DOI: 10.1007/s12161-019-01501-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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9
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Pagani AP, Ibañez GA. Analytical approach for the simultaneous determination of quinolones in edible animal products. Modeling pH–modulated fluorescence excitation–emission matrices four–way arrays. Talanta 2019; 192:52-60. [DOI: 10.1016/j.talanta.2018.09.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 09/04/2018] [Accepted: 09/05/2018] [Indexed: 11/16/2022]
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10
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Bae SY, Winemiller MD. Trace Level Analysis of Sarin and VX in Food Using Normal Phase Silica Gel and Ultra-Performance Liquid Chromatography-Time-of-Flight Mass Spectrometry (UPLC-TOF-MS). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:7846-7856. [PMID: 29920090 DOI: 10.1021/acs.jafc.8b01756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Ultra-Performance Liquid Chromatography/electrospray ionization mass spectrometry was used for the trace level determination of isopropyl methylphosphonofluoridate (Sarin, GB) and ( O-ethyl S-[2-(diisopropylamino)ethyl] methylphosphonothioate (VX) after extraction from various foods. A method utilizing normal phase silica gel was developed for the sample preparation and extraction of VX and GB from food. The extraction efficiencies of the normal phase silica gel method for VX was compared to those of other commercial solid phase extraction media and was found to be comparable. Sarin was found to be incompatible with both the mixed mode cation exchange (MCX) sorbents and QuEChERS methods that are commercially available but was successful with the normal phase silica gel method. The linear range of quantitation for VX was 0.1-330 ng/mL and for GB was 20-1200 ng/mL. The average recoveries of VX and GB from the various food matrices along with the corresponding relative standard deviations (RSDs) are reported.
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Affiliation(s)
- Sue Y Bae
- Research and Technology Directorate , U.S. Army, Edgewood Chemical Biological Center (ECBC), Aberdeen Proving Ground , Maryland 21010-5424 , United States
| | - Mark D Winemiller
- Research and Technology Directorate , U.S. Army, Edgewood Chemical Biological Center (ECBC), Aberdeen Proving Ground , Maryland 21010-5424 , United States
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11
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Zhao F, Du Y, Tian J, Shi D, Wang Y, Hu L, Yu S, Yu X, Pu L. Enantioselective Fluorescent Recognition of Amino Acids in Aqueous Solution by Using a Chiral Aldehyde Probe. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701773] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Feng Zhao
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
| | - Yi Du
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
| | - Jun Tian
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
| | - Dan Shi
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
| | - Yachen Wang
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
| | - Lingling Hu
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
| | - Shanshan Yu
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
| | - Xiaoqi Yu
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
| | - Lin Pu
- Key Laboratory of Green Chemistry and Technology; Ministry of Education; Sichuan University; 610064 Chengdu China610064
- Department of Chemistry; University of Virginia; McCormick Rd 22904 Charlottesville VA USA
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12
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Zeng C, Zhang X, Pu L. Enantioselective Fluorescent Imaging of Free Amino Acids in Living Cells. Chemistry 2017; 23:2432-2438. [DOI: 10.1002/chem.201605028] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Chaoyuan Zeng
- Key Laboratory of Cluster Science of Ministry of Education; Beijing Key Laboratory of Photoelectronic/Electrophotonic; Conversion Materials; School of Chemistry; Beijing Institute of Technology; 5 Zhongguancun Road Beijing 100081 P.R. China
| | - Xiaoling Zhang
- Key Laboratory of Cluster Science of Ministry of Education; Beijing Key Laboratory of Photoelectronic/Electrophotonic; Conversion Materials; School of Chemistry; Beijing Institute of Technology; 5 Zhongguancun Road Beijing 100081 P.R. China
| | - Lin Pu
- Department of Chemistry; University of Virginia; Charlottesville VA 22904 USA
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13
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Singh B, Kumar A, Malik AK. Flavonoids biosynthesis in plants and its further analysis by capillary electrophoresis. Electrophoresis 2017; 38:820-832. [DOI: 10.1002/elps.201600334] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 11/18/2016] [Accepted: 11/21/2016] [Indexed: 01/16/2023]
Affiliation(s)
- Baljinder Singh
- Department of Biotechnology; Panjab University; Chandigarh India
| | - Ashwini Kumar
- Department of Chemistry; Government Post-Graduate College Una; Himachal Pradesh India
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Creamer JS, Mora MF, Willis PA. Enhanced Resolution of Chiral Amino Acids with Capillary Electrophoresis for Biosignature Detection in Extraterrestrial Samples. Anal Chem 2016; 89:1329-1337. [DOI: 10.1021/acs.analchem.6b04338] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jessica S. Creamer
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Maria F. Mora
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Peter A. Willis
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
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Bol’shakova DS, Amelin VG. Determination of pesticides in environmental materials and food products by capillary electrophoresis. JOURNAL OF ANALYTICAL CHEMISTRY 2016. [DOI: 10.1134/s1061934816100026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Development and Validation of a Green Capillary Electrophoretic Method for Determination of Polyphenolic Compounds in Red Wine Samples. Chromatographia 2016. [DOI: 10.1007/s10337-016-3147-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Prior A, Sánchez-Hernández L, Sastre-Toraño J, Marina ML, de Jong GJ, Somsen GW. Enantioselective analysis of proteinogenic amino acids in cerebrospinal fluid by capillary electrophoresis-mass spectrometry. Electrophoresis 2016; 37:2410-9. [PMID: 27465690 DOI: 10.1002/elps.201600015] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 06/06/2016] [Accepted: 06/15/2016] [Indexed: 11/06/2022]
Abstract
d-Amino acids (AAs) are increasingly being recognized as essential molecules in biological systems. Enantioselective analysis of proteinogenic AAs in biological samples was accomplished by CE-MS employing β-CD as chiral selector and ESI via sheath-liquid (SL) interfacing. Prior to analysis, AAs were fully derivatized with FMOC, improving AA-enantiomer separation and ESI efficiency. In order to optimize the separation and MS detection of FMOC-AAs, the effects of type and concentration of CD in the BGE, the composition of the SL, and MS-interfacing parameters were evaluated. Using a BGE of 10 mM β-CD in 50 mM ammonium bicarbonate (pH 8) containing 15% v/v isopropanol, a SL of isopropanol-water-1 M ammonium bicarbonate (50:50:1, v/v/v) at a flow rate of 3 μL/min, and a nebulizer gas pressure of 2 psi, 15 proteinogenic AAs could be detected with enantioresolutions up to 3.5 and detection limits down to 0.9 μM (equivalent to less than 3 pg AA injected). The selectivity of the method was demonstrated by the analysis of spiked cerebrospinal fluid, allowing specific detection of d-AAs. Repeatability and linearity obtained for cerebrospinal fluid were similar to standard solutions, with peak area and migration-time RSDs (n = 5) below 16.2 and 1.6%, respectively, and a linear response (R(2) ≥ 0.977) in the 3-90 μM range.
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Affiliation(s)
- Amir Prior
- Division of BioAnalytical Chemistry, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
| | - Laura Sánchez-Hernández
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá, Alcalá de Henares (Madrid), Spain
| | - Javier Sastre-Toraño
- Division of Biomolecular Analysis, Utrecht University, CG Utrecht, The Netherlands
| | - Maria Luisa Marina
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá, Alcalá de Henares (Madrid), Spain
| | - Gerhardus J de Jong
- Division of Biomolecular Analysis, Utrecht University, CG Utrecht, The Netherlands
| | - Govert W Somsen
- Division of BioAnalytical Chemistry, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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Passos HM, Cieslarova Z, Simionato AVC. CE-UV for the characterization of passion fruit juices provenance by amino acids profile with the aid of chemometric tools. Electrophoresis 2016; 37:1923-9. [PMID: 26800985 DOI: 10.1002/elps.201500483] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 12/21/2015] [Accepted: 01/05/2016] [Indexed: 11/08/2022]
Abstract
A separation method was developed in order to quantify free amino acids in passion fruit juices using CE-UV. A selective derivatization reaction with FMOC followed by MEKC analysis was chosen due to the highly interconnected mobilities of the analytes, enabling the separation of 22 amino acids by lipophilicity differences, as will be further discussed. To achieve such results, the method was optimized concerning BGE composition (concentrations, pH, and addition of organic modifier) and running conditions (temperature and applied voltage). The optimized running conditions were: a BGE composed by 60 mmol/L borate buffer at pH 10.1, 30 mmol/L SDS and 5 % methanol; running for 40 min at 23°C and 25 kV. The method was validated and applied on eight brands plus one fresh natural juice, detecting 12 amino acids. Quantification of six analytes combined with principal component analysis was capable to characterize different types of juices and showed potential to detect adulteration on industrial juices. Glutamic acid was found to be the most concentrated amino acid in all juices, exceeding 1 g/L in all samples and was also crucial for the correct classification of a natural juice, which presented a concentration of 22 g/L.
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Affiliation(s)
| | - Zuzana Cieslarova
- Institute of Chemistry, University of Campinas-Unicamp, Campinas, SP, Brazil
| | - Ana Valéria Colnaghi Simionato
- Institute of Chemistry, University of Campinas-Unicamp, Campinas, SP, Brazil.,National Institute of Science and Technology in Bioanalytics, Brazil
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Application of CE-MS to a metabonomics study of human urine from cigarette smokers and non-smokers. Bioanalysis 2015; 6:2733-49. [PMID: 25413705 DOI: 10.4155/bio.14.136] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Novel biomarkers of exposure and early adverse effects are needed for comparative studies of combustible and non-combustible tobacco products for regulatory authority evaluation. Metabolic biomarkers reflect both gene and environmental effects. RESULTS CE-MS has been applied to human urine samples from non-smokers and smokers of cigarettes at two tar levels. Validated chemometric models were able to separate smokers from non-smokers, with discrimination mainly based on the presence of nicotine metabolites. With these removed, it still proved possible to discriminate smokers from non-smokers with models now based on endogenous metabolites. The biochemical relevance of these biomarkers is discussed. CONCLUSION This proof-of-principle metabonomics study illustrates the potential of CE-MS to discover novel biomarkers in urine from tobacco users.
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Picariello G, Mamone G, Nitride C, Addeo F, Ferranti P. Protein digestomics: Integrated platforms to study food-protein digestion and derived functional and active peptides. Trends Analyt Chem 2013. [DOI: 10.1016/j.trac.2013.08.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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21
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Ismail NA, Posma JM, Frost G, Holmes E, Garcia-Perez I. The role of metabonomics as a tool for augmenting nutritional information in epidemiological studies. Electrophoresis 2013; 34:2776-86. [PMID: 23893902 DOI: 10.1002/elps.201300066] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 07/04/2013] [Accepted: 07/12/2013] [Indexed: 11/07/2022]
Abstract
Most chronic diseases have been demonstrated to have a link to nutrition. Within food and nutritional research there is a major driver to understand the relationship between diet and disease in order to improve health of individuals. However, the lack of accurate dietary intake assessment in free-living populations, makes accurate estimation of how diet is associated with disease risk difficulty. Thus, there is a pressing need to find solutions to the inaccuracy of dietary reporting. Metabolic profiling of urine or plasma can provide an unbiased approach to characterizing dietary intake and various high-throughput analytical platforms have been used in order to implement targeted and nontargeted assays in nutritional clinical trials and nutritional epidemiology studies. This review describes first the challenges presented in interpreting the relationship between diet and health within individual and epidemiological frameworks. Second, we aim to explore how metabonomics can benefit different types of nutritional studies and discuss the critical importance of selecting appropriate analytical techniques in these studies. Third, we propose a strategy capable of providing accurate assessment of food intake within an epidemiological framework in order establish accurate associations between diet and health.
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Affiliation(s)
- Nurhafzan A Ismail
- Division of Endocrinology and Metabolism, Nutrition and Dietetic Research Group, Imperial College London, London, United Kingdom
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22
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Tsuruoka M, Hara J, Hirayama A, Sugimoto M, Soga T, Shankle WR, Tomita M. Capillary electrophoresis-mass spectrometry-based metabolome analysis of serum and saliva from neurodegenerative dementia patients. Electrophoresis 2013; 34:2865-72. [PMID: 23857558 DOI: 10.1002/elps.201300019] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 03/12/2013] [Accepted: 03/31/2013] [Indexed: 11/09/2022]
Abstract
Despite increasing global prevalence, the precise pathogenesis and terms for objective diagnosis of neurodegenerative dementias remain controversial, and comprehensive understanding of the disease remains lacking. Here, we conducted metabolomic analysis of serum and saliva obtained from patients with neurodegenerative dementias (n = 10), including Alzheimer's disease, frontotemporal lobe dementia, and Lewy body disease, as well as from age-matched healthy controls (n = 9). Using CE-TOF-MS, six metabolites in serum (β-alanine, creatinine, hydroxyproline, glutamine, iso-citrate, and cytidine) and two in saliva (arginine and tyrosine) were significantly different between dementias and controls. Using multivariate analysis, serum was confirmed as a more efficient biological fluid for diagnosis compared to saliva; additionally, 45 metabolites in total were identified as candidate markers that could discriminate at least one pair of diagnostic groups from the healthy control group. These metabolites possibly provide an objective method for diagnosing dementia-type by multiphase screening. Moreover, diagnostic-type-dependent differences were observed in several tricarboxylic acid cycle compounds detected in serum, indicating that some pathways in glucose metabolism may be altered in dementia patients. This pilot study revealed novel alterations in metabolomic profiles between various neurodegenerative dementias, which would contribute to etiological investigations.
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Affiliation(s)
- Mayuko Tsuruoka
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata, Japan; Faculty of Environment and Information Studies, Keio University, Fujisawa, Kanagawa, Japan
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Classification of Green and Black Teas by PCA and SVM Analysis of Cyclic Voltammetric Signals from Metallic Oxide-Modified Electrode. FOOD ANAL METHOD 2013. [DOI: 10.1007/s12161-013-9649-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Zhao D, Lu M, Cai Z. Separation and determination of B vitamins and essential amino acids in health drinks by CE-LIF with simultaneous derivatization. Electrophoresis 2012; 33:2424-32. [DOI: 10.1002/elps.201200040] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Danyue Zhao
- Department of Chemistry; Hong Kong Baptist University; Kowloon Tong; Kowloon; Hong Kong SAR; China
| | - Minghua Lu
- Department of Chemistry; Hong Kong Baptist University; Kowloon Tong; Kowloon; Hong Kong SAR; China
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25
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Rittgen J, Pütz M, Zimmermann R. Identification of fentanyl derivatives at trace levels with nonaqueous capillary electrophoresis-electrospray-tandem mass spectrometry (MSn, n = 2, 3): Analytical method and forensic applications. Electrophoresis 2012; 33:1595-605. [DOI: 10.1002/elps.201100655] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Michael Pütz
- Forensic Science Institute; Bundeskriminalamt - Federal Criminal Police Office; Wiesbaden; Germany
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26
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Capillary electrophoresis coupled with mass spectrometry for the evaluation of substance P enzymatic degradation by SaOS-2 human osteosarcoma. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:2501-6. [DOI: 10.1016/j.jchromb.2011.06.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 06/28/2011] [Accepted: 06/30/2011] [Indexed: 02/05/2023]
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Piñero MY, Bauza R, Arce L. Thirty years of capillary electrophoresis in food analysis laboratories: potential applications. Electrophoresis 2011; 32:1379-93. [PMID: 21538397 DOI: 10.1002/elps.201000541] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 02/07/2011] [Accepted: 02/07/2011] [Indexed: 01/20/2023]
Abstract
CE has generated considerable interest in the research community since instruments were introduced by different trading companies in the 1990s. Nowadays, CE is popular due to its simplicity, speed, highly efficient separations and minimal solvent and reagent consumption; it can also be included as a useful technique in the nanotechnology field and it covers a wide range of specific applications in different fields (chemical, pharmaceutical, genetic, clinical, food and environmental). CE has been very well evaluated in research laboratories for several years, and different new approaches to improve sensitivity (one of the main drawbacks of CE) and robustness have been proposed. However, this technique is still not well accepted in routine laboratories for food analysis. Researching in data bases, it is easy to find several electrophoretic methods to determine different groups of analytes and sometimes they are compared in terms of sensitivity, selectivity, precision and applicability with other separation techniques. Although these papers frequently prove the potential of this methodology in spiked samples, it is not common to find a discussion of the well-known complexity of the matrices to extract analytes from the sample and/or to study the interferences in the target analytes. Summarizing, the majority of CE scientific papers focus primarily on the effects upon the separation of the analytes while ignoring their behavior if these analytes are presented in real samples.
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Marák J, Staňová A, Gajdoštínová S, Škultéty L, Kaniansky D. Some possibilities of an analysis of complex samples by a mass spectrometry with a sample pretreatment by an offline coupled preparative capillary isotachophoresis. Electrophoresis 2011; 32:1273-81. [DOI: 10.1002/elps.201000629] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 01/10/2011] [Accepted: 01/20/2011] [Indexed: 01/30/2023]
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Verardo V, Gomez-Caravaca AM, Segura-Carretero A, Caboni MF, Fernández-Gutiérrez A. Development of a CE-ESI-microTOF-MS method for a rapid identification of phenolic compounds in buckwheat. Electrophoresis 2011; 32:669-73. [PMID: 21365659 DOI: 10.1002/elps.201000609] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2010] [Revised: 12/06/2010] [Accepted: 12/23/2010] [Indexed: 11/11/2022]
Abstract
A sensitive CE-ESI-MS analytical method for the identification of buckwheat antioxidants has been developed. CE and ESI-TOF parameters (e.g. buffer composition and pH, sheath liquid composition, sheath liquid and gas flow rates, electrospray voltage) were optimized to obtain an optimal analytical separation and identification. The results confirmed the presence of phenolic acids, procyanidins and galloylated propelargonidins. The identification of swertiamacroside and 2-hydroxy-3-O-β-D-glucopyranosil-benzoic acid, found for the first time in our previous work, has been confirmed. Furthermore, 5,7,4'-trimethoxyflavan and dihydroxy-trimethoxyisoflavan have also been tentatively identified for the first time in buckwheat.
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Affiliation(s)
- Vito Verardo
- Dipartimento di Scienze degli Alimenti, Università di Bologna, Cesena (FC) Italy
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Quirantes-Piné R, Arráez-Román D, Segura-Carretero A, Fernández-Gutiérrez A. Characterization of phenolic and other polar compounds in a lemon verbena extract by capillary electrophoresis-electrospray ionization-mass spectrometry. J Sep Sci 2010; 33:2818-27. [DOI: 10.1002/jssc.201000228] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Application and potential of capillary electroseparation methods to determine antioxidant phenolic compounds from plant food material. J Pharm Biomed Anal 2010; 53:1130-60. [PMID: 20719447 DOI: 10.1016/j.jpba.2010.07.028] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Revised: 07/09/2010] [Accepted: 07/18/2010] [Indexed: 12/17/2022]
Abstract
Antioxidants are one of the most common active ingredients of nutritionally functional foods which can play an important role in the prevention of oxidation and cellular damage inhibiting or delaying the oxidative processes. In recent years there has been an increased interest in the application of antioxidants to medical treatment as information is constantly gathered linking the development of human diseases to oxidative stress. Within antioxidants, phenolic molecules are an important category of compounds, commonly present in a wide variety of plant food materials. Their correct determination is pivotal nowadays and involves their extraction from the sample, analytical separation, identification, quantification and interpretation of the data. The aim of this review is to provide an overview about all the necessary steps of any analytical procedure to achieve the determination of phenolic compounds from plant matrices, paying particular attention to the application and potential of capillary electroseparation methods. Since it is quite complicated to establish a classification of plant food material, and to structure the current review, we will group the different matrices as follows: fruits, vegetables, herbs, spices and medicinal plants, beverages, vegetable oils, cereals, legumes and nuts and other matrices (including cocoa beans and bee products). At the end of the overview, we include two sections to explain the usefulness of the data about phenols provided by capillary electrophoresis and the newest trends.
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Shin GW, Hwang HS, Chung B, Jung GY. Recent developments in CE-based detection methods for food-borne pathogens. Electrophoresis 2010; 31:2137-53. [DOI: 10.1002/elps.200900682] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Simó C, Domínguez-Vega E, Marina ML, García MC, Dinelli G, Cifuentes A. CE-TOF MS analysis of complex protein hydrolyzates from genetically modified soybeans--a tool for foodomics. Electrophoresis 2010; 31:1175-1183. [PMID: 20209569 DOI: 10.1002/elps.200900448] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
A CE-TOF MS proteomic approach was applied for the analysis of hydrolyzates from complex soybean protein mixtures. After CE-TOF MS method development, the new approach provided the simultaneous analysis of more than 150 peptides from the soybean protein fraction soluble in ACN-water (80/20 v/v). The method is fast (about 30 min of analysis per sample) and is characterized by a relatively low running cost. The approach was used to study the substantial equivalence between a genetically modified variety of soybean compared with its traditional counterpart. No significant differences were found between the two studied soybeans based on the protein fraction studied. The capacity of the CE-TOF MS method to analyze complex mixtures of peptides in short times opens interesting possibilities in the growing Foodomics area.
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Affiliation(s)
- Carolina Simó
- Department of Food Analysis, Institute of Industrial Fermentations, CSIC, Madrid, Spain
| | - Elena Domínguez-Vega
- Department of Analytical Chemistry, Faculty of Chemistry, University of Alcalá, Madrid, Spain
| | - Maria Luisa Marina
- Department of Analytical Chemistry, Faculty of Chemistry, University of Alcalá, Madrid, Spain
| | - María Concepción García
- Department of Analytical Chemistry, Faculty of Chemistry, University of Alcalá, Madrid, Spain
| | - Giovanni Dinelli
- Department of Agroenvironmental Science and Technology, University of Bologna, Bologna, Italy
| | - Alejandro Cifuentes
- Department of Food Analysis, Institute of Industrial Fermentations, CSIC, Madrid, Spain
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Klepárník K, Otevřel M. Analyte transport in liquid junction nano-electrospray interface between capillary electrophoresis and mass spectrometry. Electrophoresis 2010; 31:879-85. [DOI: 10.1002/elps.200900544] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Peres RG, Micke GA, Tavares MFM, Rodriguez-Amaya DB. Multivariant optimization, validation, and application of capillary electrophoresis for simultaneous determination of polyphenols and phenolic acids in Brazilian wines. J Sep Sci 2010; 32:3822-8. [PMID: 19877139 DOI: 10.1002/jssc.200900312] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A method for the simultaneous determination of the stilbene resveratrol, four phenolic acids (syringic, coumaric, caffeic, and gallic acids), and five flavonoids (catechin, rutin, kaempferol, myricetin, and quercetin) in wine by CE was developed and validated. The CE electrolyte composition and instrumental conditions were optimized using 2(7-3) factorial design and response surface analysis, showing sodium tetraborate, MeOH, and their interaction as the most influential variables. The optimal electrophoretic conditions, minimizing the chromatographic resolution statistic values, consisted of 17 mmol/L sodium tetraborate with 20% methanol as electrolyte, constant voltage of 25 kV, hydrodynamic injection at 50 mbar for 3 s, and temperature of 25 degrees C. The R(2) values for linearity varied from 0.994 to 0.999; LOD and LOQ were 0.1 to 0.3 mg/L and 0.4 to 0.8 mg/L, respectively. The RSDs for migration time and peak area obtained from ten consecutive injections were less than 2% and recoveries varied from 97 to 102%. The method was applied to 23 samples of inexpensive Brazilian wines, showing wide compositional variation.
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Affiliation(s)
- Renato G Peres
- Departament of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP, Brazil
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36
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Bachmann S, Vallant R, Bakry R, Huck CW, Corradini D, Bonn GK. CE coupled to MALDI with novel covalently coated capillaries. Electrophoresis 2010; 31:618-29. [DOI: 10.1002/elps.200900507] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Rodríguez Robledo V, Smyth WF. The application of CE-MS in the trace analysis of environmental pollutants and food contaminants. Electrophoresis 2009; 30:1647-60. [PMID: 19378285 DOI: 10.1002/elps.200800651] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In this review, selected applications of CE-MS in recent years have been highlighted for the separation, detection and determination of environmental pollutants and food contaminants in selected samples. Trace analysis by CE-MS of analytes such as low molecular mass amines, nitroaromatics, alkylphosphonic acids, azo dyes, antidepressants, and antibiotic drugs, among others, in air, sediment and water samples have been reviewed. The CE-MS analysis of pesticides such as triazolopyrimidine sulphoanilides, different types of antibiotics (sulphonamides, beta-lactones, quinolones and tetracyclines) and other exogenous compounds such as acrylamide and toxic oligopeptides in food samples has also been reviewed. The review gives details on the fragmentations, where available, that the ionic species exhibit in-source and in ion trap, triple quadrupole and ToF MS analysers. A critical evaluation is also given of these recent CE-MS analytical methods for the separation, detection and determination of trace levels of such pollutants and contaminants with analytical information on the treatment of the samples, CE separation conditions, linearity ranges, LODs and recoveries from the different matrices presented.
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Affiliation(s)
- Virginia Rodríguez Robledo
- Departamento de Química Analítica y Tecnología de los Alimentos, Facultad de Ciencias Químicas, University of Castilla-La Mancha, Cuidad Real, Spain
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De Benedetto GE, Fanigliulo M. A new CE-ESI-MS method for the detection of stable hemoglobin acetaldehyde adducts, potential biomarkers of alcohol abuse. Electrophoresis 2009; 30:1798-807. [PMID: 19441035 DOI: 10.1002/elps.200800379] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A new CE-ESI-MS method was developed to provide a simple way to study changes to hemoglobin (HbA) induced by acetaldehyde (Ach) in vitro. Instrumental parameters were univariately optimized in order to maximize the sensitivity of the CE-ESI-MS method. The electrophoretic separations were carried out in poly-E323-coated capillaries using 60 mM formic acid raised to pH 3.0 with ammonia and containing 5% 2-propanol while the sheath liquid, 2-propanol/water (30:70) with 0.1% formic acid, was delivered at 1.0 microL/min through a coaxial sheath flow electrospray interface. The HbA was incubated with Ach for intervals up to 24 h at concentration varying in the window 0.2-20 mM. Four stable Ach-hemoglobin adducts in the hemoglobin tryptic digest were observed at the submillimolar Ach concentration and characterized by MS/MS experiments: although the alpha and beta N-amino terminal modifications were expected, the two internal ones arising, respectively, from the condensation of Ach molecules on the histidine residue in position 4 in alpha4 (i.e. the fourth peptide after tryptic digestion of alpha chain starting from amino terminal) and on the asparagine residue in position 2 in beta3, were identified for the first time. During the in vitro experiments higher concentrations of Ach were also used; however, it was not possible to identify any other stable modification of hemoglobin. Interestingly, those stable modifications are the only ones in vivo identified in the hemoglobin of moderate alcohol drinkers.
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Affiliation(s)
- Giuseppe E De Benedetto
- Laboratorio di Analisi Chimiche per l'Ambiente e i Beni Culturali, Dipartimento dei Beni delle Arti e della Storia, Università del Salento, Lecce, Italy.
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Ravelo-Pérez LM, Asensio-Ramos M, Hernández-Borges J, Rodríguez-Delgado MA. Recent food safety and food quality applications of CE-MS. Electrophoresis 2009; 30:1624-46. [PMID: 19360778 DOI: 10.1002/elps.200800670] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The first on-line coupling of CE with MS detection more than 20 years ago provided a very powerful technique with a wide variety of applications, among which food analysis is of special interest, especially that dealing with food safety and food quality applications, the major topics of public interest nowadays. With this review article, we would like to show the most recent applications of CE-MS in both fields by recompiling and commenting articles published between January 2004 and October 2008. Although both applications are difficult to separate from each other, we have included in this work two main sections dealing with each specific field. Future trends will also be discussed.
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Affiliation(s)
- Lidia M Ravelo-Pérez
- Departamento de Química Analítica, Nutrición y Bromatología, Universidad de La Laguna, La Laguna, Tenerife, Islas Canarias, Spain
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Leon C, Rodriguez-Meizoso I, Lucio M, Garcia-Cañas V, Ibañez E, Schmitt-Kopplin P, Cifuentes A. Metabolomics of transgenic maize combining Fourier transform-ion cyclotron resonance-mass spectrometry, capillary electrophoresis-mass spectrometry and pressurized liquid extraction. J Chromatogr A 2009; 1216:7314-23. [DOI: 10.1016/j.chroma.2009.04.092] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2009] [Revised: 04/01/2009] [Accepted: 04/28/2009] [Indexed: 01/25/2023]
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41
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42
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García-Campaña AM, Gámiz-Gracia L, Lara FJ, del Olmo Iruela M, Cruces-Blanco C. Applications of capillary electrophoresis to the determination of antibiotics in food and environmental samples. Anal Bioanal Chem 2009; 395:967-86. [DOI: 10.1007/s00216-009-2867-9] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2009] [Revised: 05/15/2009] [Accepted: 05/26/2009] [Indexed: 10/20/2022]
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43
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Klampfl CW. CE with MS detection: A rapidly developing hyphenated technique. Electrophoresis 2009; 30 Suppl 1:S83-91. [DOI: 10.1002/elps.200900088] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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44
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Blasco C, Picó Y, Andreu V. Analytical method for simultaneous determination of pesticide and veterinary drug residues in milk by CE-MS. Electrophoresis 2009; 30:1698-707. [DOI: 10.1002/elps.200800696] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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45
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Bailón-Pérez MI, García-Campaña AM, del Olmo Iruela M, Cruces-Blanco C, Gracia LG. Multiresidue determination of penicillins in environmental waters and chicken muscle samples by means of capillary electrophoresis-tandem mass spectrometry. Electrophoresis 2009; 30:1708-17. [DOI: 10.1002/elps.200800732] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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46
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Klampfl CW, Andersen L, Haunschmidt M, Himmelsbach M, Buchberger W. Analysis of melamine in milk powder by CZE using UV detection and hyphenation with ESI quadrupole/TOF MS detection. Electrophoresis 2009; 30:1743-6. [DOI: 10.1002/elps.200800786] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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47
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Giuffrida A, León C, García-Cañas V, Cucinotta V, Cifuentes A. Modified cyclodextrins for fast and sensitive chiral-capillary electrophoresis-mass spectrometry. Electrophoresis 2009; 30:1734-42. [DOI: 10.1002/elps.200800333] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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48
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Shi LH, Jin YX, Moon DC, Kim SK, Park SR. A sheathless CE/ESI-MS interface with an ionophore membrane-packed electro-conduction channel. Electrophoresis 2009; 30:1661-9. [DOI: 10.1002/elps.200800664] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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49
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Fu X, Liu Y, Li W, Pang N, Nie H, Liu H, Cai Z. Analysis of aristolochic acids by CE-MS with carboxymethyl chitosan-coated capillary. Electrophoresis 2009; 30:1783-9. [DOI: 10.1002/elps.200800487] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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50
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Helmja K, Borissova M, Knjazeva T, Jaanus M, Muinasmaa U, Kaljurand M, Vaher M. Fraction collection in capillary electrophoresis for various stand-alone mass spectrometers. J Chromatogr A 2009; 1216:3666-73. [DOI: 10.1016/j.chroma.2008.12.061] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Revised: 12/18/2008] [Accepted: 12/22/2008] [Indexed: 11/26/2022]
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