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Tikunov AP. Whole-Body Mouse Fluxomic Analysis to Detect Metabolic Disruptions Associated with Microcephaly: Using 13C Isotopes. Methods Mol Biol 2023; 2583:149-156. [PMID: 36418732 DOI: 10.1007/978-1-0716-2752-5_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Diverse metabolic disorders can disrupt brain growth, and analyzing metabolism in animal models of microcephaly may reveal new mechanisms of pathogenesis. The metabolism of functioning cells in a living organism is constantly changing in response to a changing environment, circadian rhythms, consumed food, drugs, progressing sicknesses, aging, and many other factors. Metabolic profiling can give important insights into the working machinery of the cell. However, a frozen snapshot of the interconnected, complex network of reactions gives very limited information about this system. Flux analysis using stable isotope labels enables more robust metabolic studies that consider interrogate metabolite processing and changes in molecular concentrations over time.
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Affiliation(s)
- Andrey P Tikunov
- Department of Neurology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
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A molecularly imprinted electrochemical biosensor based on hierarchical Ti 2Nb 10O 29 (TNO) for glucose detection. Mikrochim Acta 2021; 189:24. [PMID: 34894290 DOI: 10.1007/s00604-021-05128-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 12/02/2021] [Indexed: 10/19/2022]
Abstract
A novel molecularly imprinted electrochemical biosensor for glucose detection is reported based on a hierarchical N-rich carbon conductive-coated TNO structure (TNO@NC). Firstly, TNO@NC was fabricated by a novel polypyrrole-chemical vapor deposition (PPy-CVD) method with minimal waste generation. Afterward, the electrode modification with TNO@NC was performed by dropping TNO@NC particles on glassy carbon electrode surfaces by infrared heat lamp. Finally, the glucose-imprinted electrochemical biosensor was developed in presence of 75.0 mM pyrrole and 25.0 mM glucose in a potential range from + 0.20 to + 1.20 V versus Ag/AgCl via cyclic voltammetry (CV). The physicochemical and electrochemical characterizations of the fabricated molecularly imprinted biosensor was conducted by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) method, X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and CV techniques. The findings demonstrated that selective, sensitive, and stable electrochemical signals were proportional to different glucose concentrations, and the sensitivity of molecularly imprinted electrochemical biosensor for glucose detection was estimated to be 18.93 μA μM-1 cm-2 (R2 = 0.99) at + 0.30 V with the limit of detection (LOD) of 1.0 × 10-6 M. Hence, it can be speculated that the fabricated glucose-imprinted biosensor may be used in a multitude of areas, including public health and food quality.
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Quantification of 2-NBDG, a probe for glucose uptake, in GLUT1 overexpression in HEK293T cells by LC-MS/MS. Anal Biochem 2021; 631:114357. [PMID: 34469746 DOI: 10.1016/j.ab.2021.114357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 08/23/2021] [Accepted: 08/25/2021] [Indexed: 01/06/2023]
Abstract
The growth and proliferation of most cancer cells involve the excessive uptake of glucose mediated by glucose transporters. An effective strategy for cancer therapy has been to inhibit the GLUTs that are usually overexpressed in a variety of tumor cells. 2-NBDG is a GLUT1 substrate that can be used as a probe for GLUT1 inhibitors. An accurate and simple assay for 2-NBDG in a HEK293T cell model overexpressing GLUT1 was developed using liquid chromatography-tandem mass spectrometry. Chromatographic separation was achieved using a Xbridge® Amide column (3.5 μm, 2.1 mm × 150 mm, Waters) with acetonitrile-water containing 2 μM ammonium acetate (80:20, v/v) at a flow rate of 0.25 mL/min. Mass detection was conducted in the parallel reaction monitoring (PRM) mode. The calibration curve for 2-NBDG showed good linearity in the concentration range of 5-500 ng/mL with satisfactory precision, a relative standard deviation ranging from 2.92 to 9.59% and accuracy with a relative error ranging from -13.14 to 7.34%. This method was successfully applied to quantify the uptake of GLUT1-mediated 2-NBDG, and the results clearly indicated inhibition of GLUT1 by WZB117 and quercetin (two potent glucose transporter inhibitors) in the GLUT1-HEK293T cell model. This study provides a convenient and accurate method for high-throughput screening of selective and promising GLUT1 inhibitors.
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Valadbeigi Y, Ilbeigi V, Khodabandeh Z. Formation of anionic clusters of triols in the atmospheric pressure chemical ionization source: An ion mobility spectrometry and theoretical study. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Thacker JB, Schug KA. Effects of solvent parameters on the electrospray ionization tandem mass spectrometry response of glucose. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:1191-1198. [PMID: 29729047 DOI: 10.1002/rcm.8155] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 03/30/2018] [Accepted: 04/24/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE The importance of saccharides, the most abundant biomolecules on Earth, extends beyond their biological roles and to consumer products and industrial processes. Electrospray ionization tandem mass spectrometry (ESI-MS/MS) is an attractive tool for the analysis of underivatized saccharides (US), but they tend to have relatively low sensitivities due to their low surface activities and lack of easily protonable or deprotonable chemical groups. An understanding of the influences that solvent parameters have on their signal intensities would enhance the usefulness of ESI-MS/MS for their analysis. METHODS Solutions of glucose, a model analyte for US, in various combinations of solvent, additive, additive concentration, and pH were analyzed by flow injection analysis ESI-MS/MS in both the positive and negative ionization mode. The blank-corrected signal intensities of the solvent parameter combinations were then compared. RESULTS The addition of acetonitrile led to severe ionization suppression in the positive ionization mode through its competition with glucose for cation adduction. High signal intensity was achieved under wide pH and concentration ranges for methanol: water solutions containing ammonium trifluoroacetate in the positive ionization mode. The highest signal intensities for acetonitrile: water solutions were those containing ammonium formate or lithium fluoride in the negative ionization mode. CONCLUSIONS An understanding of the influence of solvent parameters on the signal intensity of a given analyte is useful for guiding the selection process of mobile phases/flow solvents that lead to low limits of detection or the minimization of matrix effects by allowing its detection at high dilution factors.
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Affiliation(s)
- Jonathan B Thacker
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Arlington, TX, 76019, USA
| | - Kevin A Schug
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Arlington, TX, 76019, USA
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Yu L, Wen C, Li X, Fang S, Yang L, Wang T, Hu K. Simultaneous quantification of endogenous and exogenous plasma glucose by isotope dilution LC-MS/MS with indirect MRM of the derivative tag. Anal Bioanal Chem 2018; 410:2011-2018. [DOI: 10.1007/s00216-018-0872-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 12/23/2017] [Accepted: 01/11/2018] [Indexed: 11/29/2022]
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Coelho M, Mendes VM, Lima IS, Martins FO, Fernandes AB, Macedo MP, Jones JG, Manadas B. Direct analysis of [6,6-(2)H2]glucose and [U-(13)C6]glucose dry blood spot enrichments by LC-MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1022:242-248. [PMID: 27107853 DOI: 10.1016/j.jchromb.2016.04.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 04/08/2016] [Accepted: 04/11/2016] [Indexed: 11/29/2022]
Abstract
A liquid chromatography tandem mass spectrometry (LC-MS/MS) using multiple reaction monitoring (MRM) in a triple-quadrupole scan mode was developed and comprehensively validated for the determination of [6,6-(2)H2]glucose and [U-(13)C6]glucose enrichments from dried blood spots (DBS) without prior derivatization. The method is demonstrated with dried blood spots obtained from rats administered with a primed-constant infusion of [U-(13)C6]glucose and an oral glucose load enriched with [6,6-(2)H2]glucose. The sensitivity is sufficient for analysis of the equivalent to <5μL of blood and the overall method was accurate and precise for the determination of DBS isotopic enrichments.
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Affiliation(s)
- Margarida Coelho
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, UC Biotech, Parque Tecnológico de Cantanhede, Núcleo 04, Lote 8, 3060-197 Cantanhede, Portugal
| | - Vera M Mendes
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, UC Biotech, Parque Tecnológico de Cantanhede, Núcleo 04, Lote 8, 3060-197 Cantanhede, Portugal
| | - Inês S Lima
- Chronic Diseases Research Center (CEDOC), NOVA Medical School/Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Rua Câmara Pestana n° 6, 6-A Edifício CEDOC II, 1150-082 Lisboa, Portugal
| | - Fátima O Martins
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, UC Biotech, Parque Tecnológico de Cantanhede, Núcleo 04, Lote 8, 3060-197 Cantanhede, Portugal; Chronic Diseases Research Center (CEDOC), NOVA Medical School/Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Rua Câmara Pestana n° 6, 6-A Edifício CEDOC II, 1150-082 Lisboa, Portugal; Institute for Interdisciplinary Research (IIIUC), University of Coimbra, Casa Costa Alemão, Pólo II, Rua Dom Francisco de Lemos, 3030-789 Coimbra, Portugal
| | - Ana B Fernandes
- Chronic Diseases Research Center (CEDOC), NOVA Medical School/Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Rua Câmara Pestana n° 6, 6-A Edifício CEDOC II, 1150-082 Lisboa, Portugal
| | - M Paula Macedo
- Chronic Diseases Research Center (CEDOC), NOVA Medical School/Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Rua Câmara Pestana n° 6, 6-A Edifício CEDOC II, 1150-082 Lisboa, Portugal; APDP-Portuguese Diabetes Association, Rua Rodrigo da Fonseca, n° 1, 1250-189 Lisboa, Portugal
| | - John G Jones
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, UC Biotech, Parque Tecnológico de Cantanhede, Núcleo 04, Lote 8, 3060-197 Cantanhede, Portugal; APDP-Portuguese Diabetes Association, Rua Rodrigo da Fonseca, n° 1, 1250-189 Lisboa, Portugal
| | - Bruno Manadas
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, UC Biotech, Parque Tecnológico de Cantanhede, Núcleo 04, Lote 8, 3060-197 Cantanhede, Portugal.
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Simultaneous quantification of labeled (2)H5-glycerol, (13)C6-glucose, and endogenous D-glucose in mouse plasma using liquid chromatography tandem mass spectrometry. Anal Bioanal Chem 2015; 407:8617-22. [PMID: 26362155 DOI: 10.1007/s00216-015-9015-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Revised: 08/07/2015] [Accepted: 08/27/2015] [Indexed: 10/23/2022]
Abstract
Monitoring the level of glucose and glycerol or their labeled derivatives in biological fluid for kinetic studies has always been challenging, especially in mice, because of the limited volume in addition to the complexity of plasma. For such application, we developed a simple, fast, and sensitive method for the simultaneous measurement of absolute concentrations of labeled (2)H5-glycerol and (13)C6-glucose as well as endogenous D-glucose using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). In our study, 15.0 μL of mouse plasma was processed by a one-step protein precipitation, followed by LC-MS/MS analysis. The quantification of the analytes was carried out by monitoring the product ion scan of their corresponding deprotonated molecular ions and constructing the extracted ion fragmentogram by choosing a specific product ion for each analyte (equivalent to precursor ion to product ion transitions). The limit of detection (LOD) was evaluated to be 1.0 μM for both (2)H5-glycerol and (13)C6-glucose, and the limit of quantitation (LOQ) was observed to be 5.0 μM for both (2)H5-glycerol and (13)C6-glucose in diluted mice plasma that corresponds to 50 μM in plasma or 4.60 and 9.01 mg/dL of glycerol and glucose in plasma, respectively. The extraction recoveries are 81.9 % (CV = 8.1 %) for (2)H5-glycerol and 26.2 % (CV = 13.6 %) for (13)C6-glucose.
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Improvement of sugar analysis sensitivity using anion-exchange chromatography-electrospray ionization mass spectrometry with sheath liquid interface. J Chromatogr A 2014; 1366:65-72. [PMID: 25246101 DOI: 10.1016/j.chroma.2014.09.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 09/01/2014] [Accepted: 09/08/2014] [Indexed: 12/25/2022]
Abstract
A novel interface that enables high-performance anion-exchange chromatography (HPAEC) to be coupled with electrospray ionization (ESI) mass spectrometry (MS) is reported. A sheath liquid consisting of 50mM NH4Ac in isopropanol with 0.05% acetic acid, infused at a flow rate of 3μL/min at the tip of the electrospray probe, requires less ESI source cleaning and promotes efficient ionization of mono- and di-carbohydrates. The results suggest that use of a sheath liquid interface rather than a T-joint allows volatile ammonium salts to replace non-volatile metal salts as modifiers for improving sugar ESI signals. The efficient ionization of mono- and di-carbohydrates in the ESI source is affected by the sheath liquid properties such as buffer concentration and type of organic solvent. HPAEC-ESI-MS was used for the analysis of monocarbohydrates in pectins, particularly co-eluted sugars, and the performance was evaluated. Addition of a make-up solution through the sheath liquid interface proved to be an efficient tool for enhancing the intensities of sugars analyzed using HPAEC-ESI-MS.
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Santos-Fandila A, Zafra-Gómez A, Vazquez E, Navalón A, Rueda R, Ramírez M. Ultra high performance liquid chromatography-tandem mass spectrometry method for the determination of soluble milk glycans in rat serum. Talanta 2013; 118:137-46. [PMID: 24274281 DOI: 10.1016/j.talanta.2013.10.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 09/27/2013] [Accepted: 10/05/2013] [Indexed: 01/09/2023]
Abstract
The main objective of the present work was to develop and validate a multicompound method to measure soluble milk glycans (SMGs) in biological fluids such as serum. An ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method for the identification and quantification of the following SMGs and their precursors 2'-fucosyllactose, 3'-sialyllactose, 6'-sialyllactose, lacto-N-neotetraose, N-acetylneuraminic acid, fucose, lactose and glucose in rat serum samples was set up. These analytes were separated in an Acquity UPLC BEH Amide column using acetonitrile-water gradient with ammonia as additive, in a 10 min run, and were detected and quantified using a triple quadrupole (QqQ) mass spectrometer. The mass spectrometric conditions in negative electrospray ionization mode (ESI-) were individually optimized for each analyte to obtain maximum sensitivity in the Selected Reaction Monitoring (SRM) mode. Selection of two specific fragmentation reactions for each compound allowed simultaneous quantification and identification in one run, ensuring a high specificity of the method. The limits of detection (LODs) ranged from 5 to 70 ng mL(-1) and the limits of quantification (LOQs) from 20 to 200 ng mL(-1). The inter- and intra-day variability was lower than 15% and the recoveries ranged from 85% to 115%. A biological application of the method was also described, specifically the time-course of SMGs in rat serum after an oral challenge.
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Affiliation(s)
- A Santos-Fandila
- Abbott Nutrition, Discovery R&D, Abbott Laboratories, Camino de Purchil 68, E-18004 Granada, Spain; Research Group of Analytical Chemistry and Life Sciences, Department of Analytical Chemistry, University of Granada, Campus of Fuentenueva, E-18071 Granada, Spain.
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Lim KR, Park JM, Choi HN, Lee WY. Gold glyconanoparticle-based colorimetric bioassay for the determination of glucose in human serum. Microchem J 2013. [DOI: 10.1016/j.microc.2012.06.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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12
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Kotnik D, Šmidovnik A, Jazbec-Križman P, Križman M, Prošek M. Direct analysis of carbohydrates in animal plasma by ion chromatography coupled with mass spectrometry and pulsed amperometric detection for use as a non-invasive diagnostic tool. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:3700-6. [DOI: 10.1016/j.jchromb.2011.10.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Revised: 10/04/2011] [Accepted: 10/06/2011] [Indexed: 11/25/2022]
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Zhang G, Huang G, Xiao L, Seiber J, Mitchell AE. Acrylamide formation in almonds (Prunus dulcis): influences of roasting time and temperature, precursors, varietal selection, and storage. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:8225-8232. [PMID: 21721575 DOI: 10.1021/jf201595q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Acrylamide is a probable human carcinogen that is found in many roasted and baked foods. This paper describes two sensitive and reliable LC-(ESI)MS/MS methods for the analysis of (1) acrylamide and (2) common acrylamide precursors (i.e., glucose, fructose, asparagine, and glutamine) in raw and roasted almonds. These methods were used to evaluate the impact of roasting temperatures (between 129 and 182 °C) and times on acrylamide formation. Controlling the roasting temperature at or below 146 °C resulted in acrylamide levels below 200 ppb at all roasting times evaluated. Six varieties of almonds collected in various regions of California over two harvest years and roasted at 138 °C for 22 min had acrylamide levels ranging from 117 ± 5 μg/kg (Sonora) to 221 ± 95 μg/kg (Butte) with an average of 187 ± 71 μg/kg. A weak correlation between asparagine content in raw almonds and acrylamide formation was observed (R(2) = 0.6787). No statistical relationship was found between acrylamide formation and almond variety, orchard region, or harvest year. Stability studies on roasted almonds indicated that acrylamide levels decreased by 12.9-68.5% (average of 50.2%) after 3 days of storage at 60 °C. Short-term elevated temperature storage may be another approach for mitigating acrylamide levels in roasted almonds.
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Affiliation(s)
- Gong Zhang
- Department of Food Science and Technology, University of California, Davis, Davis, California 95616, United States
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van Wijck K, van Eijk HMH, Buurman WA, Dejong CHC, Lenaerts K. Novel analytical approach to a multi-sugar whole gut permeability assay. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:2794-801. [PMID: 21862422 DOI: 10.1016/j.jchromb.2011.08.002] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 08/01/2011] [Accepted: 08/02/2011] [Indexed: 12/17/2022]
Abstract
Many pathophysiological conditions are associated with increased gastrointestinal permeability, reflecting an elevated risk of endotoxaemia, inflammation, and sepsis. Permeability tests are increasingly used in clinical practice to obtain information on gastrointestinal functioning, but tests are often restricted to the small intestine, and require large oral sugar doses. Therefore, a novel multi-sugar assay was developed, allowing assessment of whole gut permeability changes in urinary and plasma samples collected at regular intervals from 10 healthy volunteers at baseline and after intake of monosaccharides (rhamnose and erythritol) and disaccharides (sucrose, lactulose, and sucralose). Samples were analyzed by isocratic cation-exchange LC-MS. Sample preparation and detection conditions were optimized. After centrifugation, chromatographic separation was achieved on an IOA-1000 column set at 30°C. Column effluent was mixed with ammonia for sugar-ammonium adduct formation. The lower limit of detection was 0.05 μmol/L for disaccharides and 0.1 μmol/L for monosaccharides. Linearity for each probe was between 1 and 1000 μmol/L (R(2): 0.9987-0.9999). Coefficients of variation were <5% in urine, and <9% in plasma. Recovery data were within the 90% to 110% range at all spiked concentrations. This highly sensitive novel LC-MS approach resulted in a significant decrease of the detection limit for all sugar probes, allowing a 5-fold reduction of the commonly used lactulose dose and the addition of sugar probes to also assess the gastroduodenal and colon permeability. In combination with its extended application in plasma, these features make the novel assay a promising tool in the assessment of site-specific changes in gastrointestinal permeability in clinical practice.
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Affiliation(s)
- Kim van Wijck
- Top Institute Food and Nutrition, Wageningen, The Netherlands
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Ricochon G, Paris C, Girardin M, Muniglia L. Highly sensitive, quick and simple quantification method for mono and disaccharides in aqueous media using liquid chromatography–atmospheric pressure chemical ionization–mass spectrometry (LC–APCI–MS). J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:1529-36. [DOI: 10.1016/j.jchromb.2011.03.044] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 03/22/2011] [Accepted: 03/23/2011] [Indexed: 10/18/2022]
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Ullah S, Wahren J, Beck O. Precise determination of glucose-d2/glucose ratio in human serum and plasma by APCI LC-MS/MS. Scandinavian Journal of Clinical and Laboratory Investigation 2009; 69:837-42. [DOI: 10.3109/00365510903307954] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Hammad LA, Saleh MM, Novotny MV, Mechref Y. Multiple-reaction monitoring liquid chromatography mass spectrometry for monosaccharide compositional analysis of glycoproteins. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2009; 20:1224-1234. [PMID: 19318280 DOI: 10.1016/j.jasms.2009.02.022] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2008] [Revised: 02/10/2009] [Accepted: 02/10/2009] [Indexed: 05/27/2023]
Abstract
A simple, sensitive, and rapid quantitative LC-MS/MS assay was designed for the simultaneous quantification of free and glycoprotein bound monosaccharides using a multiple reaction monitoring (MRM) approach. This study represents the first example of using LC-MS/MS methods to simultaneously quantify all common glycoprotein monosaccharides, including neutral and acidic monosaccharides. Sialic acids and reduced forms of neutral monosaccharides are efficiently separated using a porous graphitized carbon column. Neutral monosaccharide molecules are detected as their alditol acetate anion adducts [M + CH(3)CO(2)](-) using electrospray ionization in negative ion MRM mode, while sialic acids are detected as deprotonated ions [M - H](-). The new method exhibits very high sensitivity to carbohydrates with limits of detection as low as 1 pg for glucose, galactose, and mannose, and below 10 pg for other monosaccharides. The linearity of the described approach spans over three orders of magnitudes (pg to ng). The method effectively quantified monosaccharides originating from as little as 1 microg of fetuin, ribonuclease B, peroxidase, and alpha(1)-acid glycoprotein human (AGP) with results consistent with literature values and with independent CE-LIF measurements. The method is robust, rapid, and highly sensitive. It does not require derivatization or postcolumn addition of reagents.
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Affiliation(s)
- Loubna A Hammad
- METACyt Biochemical Analysis Center, Department of Chemistry, Indiana University, Bloomington, Indiana 47405, USA
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