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Hiraoka K, Ariyada O, Usmanov DT, Chen LC, Ninomiya S, Yoshimura K, Takeda S, Yu Z, Mandal MK, Wada H, Rankin-Turner S, Nonami H. Probe Electrospray Ionization (PESI) and Its Modified Versions: Dipping PESI (dPESI), Sheath-Flow PESI (sfPESI) and Adjustable sfPESI (ad-sfPESI). Mass Spectrom (Tokyo) 2020; 9:A0092. [PMID: 33299735 PMCID: PMC7708747 DOI: 10.5702/massspectrometry.a0092] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 10/21/2020] [Indexed: 11/23/2022] Open
Abstract
In 2007, probe electrospray ionization/mass spectrometry (PESI/MS) was developed. In this technique, the needle is moved down along a vertical axis and the tip of the needle touched to the sample. After capturing the sample at the needle tip, the needle is then moved up and a high voltage is applied to the needle at the highest position to generate electrospray. Due to the discontinuous sampling followed by the generation of spontaneous electrospray, sequential and exhaustive electrospray takes place depending on the surface activity of the analytes. As modified versions of PESI, dipping PESI (dPESI), sheath-flow PESI (sfPESI) and adjustable sfPESI (ad-sfPESI) have been developed. These methods are complementary to each other and they can be applicable to surface and bulk analysis of various biological samples. In this article, the characteristics of these methods and their applications to real samples will be reviewed.
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Affiliation(s)
- Kenzo Hiraoka
- Clean Energy Research Center, University of Yamanashi, 4–3–11 Takeda, Kofu 400–8511, Japan
| | - Osamu Ariyada
- ARIOS INC., 3–2–20 Musashino, Akishima, Tokyo 196–0021, Japan
| | - Dilshadbek T. Usmanov
- Clean Energy Research Center, University of Yamanashi, 4–3–11 Takeda, Kofu 400–8511, Japan
| | - Lee C. Chen
- Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4–3–11 Takeda, Kofu 400–8511, Japan
| | - Satoshi Ninomiya
- Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4–3–11 Takeda, Kofu 400–8511, Japan
| | - Kentaro Yoshimura
- Department of Anatomy and Cell Biology, Faculty of Medicine, University of Yamanashi, 1110 Shimo-Kateau, Chuo, Yamanashi 409–3898, Japan
| | - Sen Takeda
- Department of Anatomy and Cell Biology, Faculty of Medicine, University of Yamanashi, 1110 Shimo-Kateau, Chuo, Yamanashi 409–3898, Japan
| | - Zhang Yu
- Clean Energy Research Center, University of Yamanashi, 4–3–11 Takeda, Kofu 400–8511, Japan
| | - Mridul K. Mandal
- Clean Energy Research Center, University of Yamanashi, 4–3–11 Takeda, Kofu 400–8511, Japan
| | - Hiroshi Wada
- Kyushu Okinawa Agricultural Research Center, National Agricultural and Food Research Organization, 496 Izumi, Chikugo, Fukuoka 833–0041, Japan
| | - Stephanie Rankin-Turner
- Clean Energy Research Center, University of Yamanashi, 4–3–11 Takeda, Kofu 400–8511, Japan
- Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom
| | - Hiroshi Nonami
- Plant Biophysics/Biochemistry Research Laboratory, Faculty of Agriculture, Ehime University, Matsuyama 790–8566, Japan
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Han Z, Gu X, Wang S, Liu L, Wang Y, Zhao Z, Yu Z. Time-resolved in situ monitoring of photocatalytic reactions by probe electrospray ionization mass spectrometry. Analyst 2020; 145:3313-3319. [PMID: 32195503 DOI: 10.1039/d0an00305k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Probe electrospray ionization mass spectrometry (PESI-MS) has been demonstrated to be a useful in situ and online analytical technique for monitoring of various reactions. In this work, PESI-MS with a surface-modified probe was adopted and applied to in situ monitoring of photocatalytic reactions. Typical reactions of semiconductor photocatalysts, namely TiO2, SnO2, WO3, SiC and ZnS catalyzed methylene blue (MB) and brilliant green (BG) degradation, were selected to demonstrate the potential of PESI-MS to monitor heterogeneous photocatalytic reactions occurring in suspensions. Surface modification of the probe ensures increased wettability during the whole monitoring process. PESI-MS could provide continuous sampling and real-time MS results without time-consuming and cumbersome sample pretreatments. This method has other merits including good reproducibility and stability (time scale > 60 min), convenience of operation, low sample consumption, high time resolution and high tolerance to suspended photocatalyst particles. Time-resolved mass spectra and ion chromatograms of every chemical species e.g. the substrate and reactive intermediates could be obtained, which is helpful for a better understanding of the photocatalytic reaction process. Thus, PESI-MS could be a versatile analytical technique for in situ photocatalytic reaction analysis and could be an alternative means for the evaluation of photocatalyst performance.
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Affiliation(s)
- Zhongbao Han
- School of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, Liaoning, China.
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ACE-inhibitory peptides from bovine caseins released with peptidases from Maclura pomifera latex. Food Res Int 2017; 93:8-15. [PMID: 28290283 DOI: 10.1016/j.foodres.2017.01.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 01/04/2017] [Accepted: 01/06/2017] [Indexed: 01/29/2023]
Abstract
In work reported here, a proteolytic extract prepared from Maclura pomifera latex was employed to hydrolyze bovine caseins. Densitograms of Tricine-sodium-dodecyl-sulfate-polyacrylamide-gel electrophoresis (SDS-PAGE) indicated that the caseins were considerably degraded after a 10-min reaction. The degree of hydrolysis determined by the 2,4,6-trinitrobenzenesulfonic-acid method was 17.1±0.7% after 180min of digestion. The concentration of small peptides increased with hydrolysis time, and analysis by reverse-phase high-performance liquid chromatography (RP HPLC) and mass spectrometry, revealed a virtually unchanged peptide profile. These results suggested that those proteases were highly specific, as only certain peptide bonds were cleaved. The hydrolysate of 180min displayed the highest inhibition of angiotensin-converting enzyme (ACE) showing an IC50 of 1.72±0.25mg/mL, and the analysis of the peptide fractionation in this hydrolysate by RP HPLC exhibited two peaks responsible for that activity. Fragmentation analysis through the use of iterated matrix-assisted-laser-desorption-ionization-time-of-flight mass spectrometry (MALDI-TOF/TOF MS/MS) with the aid of bioinformatics tools enabled us to deduce two peptide sequences-one, YQEPVLGPVRGPFPIIV, having been previously reported as an ACE-inhibitor; the other, RFFVAPFPE, as yet undescribed. The presence of bioactive peptides in these casein hydrolysates argues for their potential use in the development of functional foods.
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Jansson ET, Dulay MT, Zare RN. Monitoring Enzymatic Reactions in Real Time Using Venturi Easy Ambient Sonic-Spray Ionization Mass Spectrometry. Anal Chem 2016; 88:6195-8. [PMID: 27249533 PMCID: PMC4917919 DOI: 10.1021/acs.analchem.6b01246] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We developed a technique to monitor spatially confined surface reactions with mass spectrometry under ambient conditions, without the need for voltage or organic solvents. Fused-silica capillaries immersed in an aqueous solution, positioned in close proximity to each other and the functionalized surface, created a laminar flow junction with a resulting reaction volume of ∼5 pL. The setup was operated with a syringe pump, delivering reagents to the surface through a fused-silica capillary. The other fused-silica capillary was connected to a Venturi easy ambient sonic-spray ionization source, sampling the resulting analytes at a slightly higher flow rate compared to the feeding capillary. The combined effects of the inflow and outflow maintains a chemical microenvironment, where the rate of advective transport overcomes diffusion. We show proof-of-concept where acetylcholinesterase was immobilized on an organosiloxane polymer through electrostatic interactions. The hydrolysis of acetylcholine by acetylcholinesterase into choline was monitored in real-time for a range of acetylcholine concentrations, fused-silica capillary geometries, and operating flow rates. Higher reaction rates and conversion yields were observed with increasing acetylcholine concentrations, as would be expected.
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Affiliation(s)
- Erik T Jansson
- Department of Chemistry, Stanford University , Stanford, California 94305, United States.,Department of Chemistry-BMC, Uppsala University , SE-75124 Uppsala, Sweden
| | - Maria T Dulay
- Department of Chemistry, Stanford University , Stanford, California 94305, United States
| | - Richard N Zare
- Department of Chemistry, Stanford University , Stanford, California 94305, United States
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Yang Y, Han F, Ouyang J, Zhao Y, Han J, Na N. In-situ nanoelectrospray for high-throughput screening of enzymes and real-time monitoring of reactions. Anal Chim Acta 2016; 902:135-141. [DOI: 10.1016/j.aca.2015.10.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 10/26/2015] [Indexed: 12/24/2022]
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Zhang W, Huang G. Fast screening of analytes for chemical reactions by reactive low-temperature plasma ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2015; 29:1947-1953. [PMID: 26443392 DOI: 10.1002/rcm.7300] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 08/01/2015] [Accepted: 08/04/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE Approaches for analyte screening have been used to aid in the fine-tuning of chemical reactions. Herein, we present a simple and straightforward analyte screening method for chemical reactions via reactive low-temperature plasma ionization mass spectrometry (reactive LTP-MS). METHODS Solution-phase reagents deposited on sample substrates were desorbed into the vapor phase by action of the LTP and by thermal desorption. Treated with LTP, both reagents reacted through a vapor phase ion/molecule reaction to generate the product. Finally, protonated reagents and products were identified by LTP-MS. RESULTS Reaction products from imine formation reaction, Eschweiler-Clarke methylation and the Eberlin reaction were detected via reactive LTP-MS. Products from the imine formation reaction with reagents substituted with different functional groups (26 out of 28 trials) were successfully screened in a time of 30 s each. Besides, two short-lived reactive intermediates of Eschweiler-Clarke methylation were also detected. CONCLUSIONS LTP in this study serves both as an ambient ionization source for analyte identification (including reagents, intermediates and products) and as a means to produce reagent ions to assist gas-phase ion/molecule reactions. The present reactive LTP-MS method enables fast screening for several analytes from several chemical reactions, which possesses good reagent compatibility and the potential to perform high-throughput analyte screening. In addition, with the detection of various reactive intermediates (intermediates I and II of Eschweiler-Clarke methylation), the present method would also contribute to revealing and elucidating reaction mechanisms.
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Affiliation(s)
- Wei Zhang
- Department of Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China (USTC), Hefei, 230026, P.R. China
| | - Guangming Huang
- Department of Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China (USTC), Hefei, 230026, P.R. China
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Yu Z, Chen LC, Ninomiya S, Mandal MK, Hiraoka K, Nonami H. Piezoelectric inkjet assisted rapid electrospray ionization mass spectrometric analysis of metabolites in plant single cells via a direct sampling probe. Analyst 2015; 139:5734-9. [PMID: 25262850 DOI: 10.1039/c4an01068j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Direct sampling probe mass spectrometry (DSP-MS) enables fast and direct profiling of metabolites in biological samples. However, because the solvent amount for the online dissolution of acquired analytes is difficult to control, the detection sensitivity is not satisfactory. In this study, we present a modified version of the DSP-MS system for direct mass spectrometric profiling of metabolites in plant single cells. Two major improvements are introduced in this work, including a pointed-tip probe with high surface wetting properties, which is ten times finer than the previous version, and a piezoelectric inkjet system working as the auxiliary solvent delivery means. The probe tip can be controlled to insert into a cell through the cell wall. Metabolites loaded on the tip surface can be extracted by the auxiliary solvent and electrosprayed after applying a high direct current voltage. The unique features such as low cost, disposability and versatility make this technique a competitive tool for single cell analysis.
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Affiliation(s)
- Zhan Yu
- College of Chemistry and Biology, Shenyang Normal University, 253 Huanghe Street, Shenyang, Liaoning 110034, China.
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Burkhardt T, Kaufmann CM, Letzel T, Grassmann J. Enzymatic Assays Coupled with Mass Spectrometry with or without Embedded Liquid Chromatography. Chembiochem 2015; 16:1985-92. [DOI: 10.1002/cbic.201500325] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Indexed: 12/20/2022]
Affiliation(s)
- Therese Burkhardt
- Chair of Urban Water Systems Engineering; Technical University of Munich (TUM); Am Coulombwall 85748 Garching Germany
| | - Christine M. Kaufmann
- Chair of Urban Water Systems Engineering; Technical University of Munich (TUM); Am Coulombwall 85748 Garching Germany
| | - Thomas Letzel
- Chair of Urban Water Systems Engineering; Technical University of Munich (TUM); Am Coulombwall 85748 Garching Germany
| | - Johanna Grassmann
- Chair of Urban Water Systems Engineering; Technical University of Munich (TUM); Am Coulombwall 85748 Garching Germany
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Klampfl CW, Himmelsbach M. Direct ionization methods in mass spectrometry: An overview. Anal Chim Acta 2015; 890:44-59. [DOI: 10.1016/j.aca.2015.07.012] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Revised: 07/15/2015] [Accepted: 07/31/2015] [Indexed: 12/15/2022]
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Hiraoka K, Usmanov DT, Chen LC, Ninomiya S, Mandal MK, Saha S. Probe electrospray ionization (PESI) mass spectrometry with discontinuous atmospheric pressure interface (DAPI). EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2015; 21:327-334. [PMID: 26307713 DOI: 10.1255/ejms.1309] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Probe electrospray ionization (PESI) using a 0.2 mm outside diameter titanium wire was performed and the generated ions were introduced into the mass spectrometer via a discontinuous atmospheric pressure interface using a pinch valve. Time-lapse PESI mass spectra were acquired by gradually increasing delay time for the pinch valve opening with respect to the start of each electrospray event when a high voltage was applied. The opening time of the pinch valve was 20 ms. Time-resolved PESI mass spectra showed marked differences for 10 mM NaCl, 10(-5) M gramicidin S and insulin in H(2)O/CH(3)OH/CH(3)COOH/CH(3)COONH(4) (65/35/1) with and without the addition of 10 mM CH(3)COONH(4). This was ascribed to the pH change of the liquid attached to the needle caused by electrochemical reactions taking place at the interface between the metal probe and the solution. NaCl cluster ions appeared only after the depletion of analytes. For the mixed solution of 10(-5) M cytochrome c, insulin, and gramicidin S in H(2)O/CH(3)OH/CH(3)COOH (65/35/1), a sequential appearance of analyte ions in the order of cytochrome c→insulin→gramicidin S was observed. The present technique was applied to three narcotic samples; methamphetamine, morphine and codeine. Limits of detection for these compounds were 10 ppb in H(2)O/CH(3)OH (1/1) for the single sampling with a pinch valve opening time of 200 ms.
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Affiliation(s)
- Kenzo Hiraoka
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511 Japan.
| | - Dilshadbek T Usmanov
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511 Japan. Institute of Ion-Plasma and Laser Technologies, Dormon Yoli Street 33, Akademgorodok, Tashkent 100125, Uzbekistan.
| | - Lee Chuin Chen
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511 Japan.
| | - Satoshi Ninomiya
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511 Japan.
| | - Mridul K Mandal
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511 Japan.
| | - Subhrakanti Saha
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511 Japan.
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Kaufmann CM, Graßmann J, Treutter D, Letzel T. Utilization of real-time electrospray ionization mass spectrometry to gain further insight into the course of nucleotide degradation by intestinal alkaline phosphatase. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:869-878. [PMID: 24623690 DOI: 10.1002/rcm.6855] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 01/23/2014] [Accepted: 01/24/2014] [Indexed: 06/03/2023]
Abstract
RATIONALE Related with its ability to degrade nucleotides, intestinal alkaline phosphatase (iAP) is an important participant in intestinal pH regulation and inflammatory processes. However, its activity has been investigated mainly by using artificial non-nucleotide substrates to enable the utilization of conventional colorimetric methods. To capture the degradation of the physiological nucleotide substrate of the enzyme along with arising intermediates and the final product, the enzymatic assay was adapted to mass spectrometric detection. Therewith, the drawbacks associated with colorimetric methods could be overcome. METHODS Enzymatic activity was comparatively investigated with a conventional colorimetric malachite green method and a single quadrupole mass spectrometer with an electrospray ionization source using the physiological nucleotide substrates ATP, ADP or AMP and three different pH-values in either methodological approach. By this means the enzymatic activity was assessed on the one hand by detecting the phosphate release spectrometrically at defined time points of enzymatic reaction or on the other by continuous monitoring with mass spectrometric detection. RESULTS Adaption of the enzymatic assay to mass spectrometric detection disclosed the entire course of all reaction components--substrate, intermediates and product--resulting from the degradation of substrate, thereby pointing out a stepwise removal of phosphate groups. By calculating enzymatic substrate conversion rates a distinctively slower degradation of AMP compared to ADP or ATP was revealed together with the finding of a substrate competition between ATP and ADP at alkaline pH. CONCLUSIONS The comparison of colorimetric and mass spectrometric methods to elucidate enzyme kinetics and specificity clearly underlines the advantages of mass spectrometric detection for the investigation of complex multi-component enzymatic assays. The entire course of enzymatic substrate degradation was revealed with different nucleotide substrates, thus allowing a specific monitoring of intestinal alkaline phosphatase activity.
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Affiliation(s)
- Christine M Kaufmann
- Chair of Urban Water Systems Engineering, Technische Universität München, Am Coulombwall 8, 85748, Garching, Germany
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Pei J, Kang Y, Huang G. Reactive intermediate detection in real time via paper assisted thermal ionization mass spectrometry. Analyst 2014; 139:5354-7. [DOI: 10.1039/c4an01343c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Interception of short-life reactive intermediates could be achieved using paper assisted thermal ionization mass spectrometry in real time.
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Affiliation(s)
- Jiying Pei
- Department of Chemistry
- University of Science and Technology of China
- Hefei, China
| | - Yanbiao Kang
- Department of Chemistry
- University of Science and Technology of China
- Hefei, China
| | - Guangming Huang
- Department of Chemistry
- University of Science and Technology of China
- Hefei, China
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Mandal MK, Saha S, Yoshimura K, Shida Y, Takeda S, Nonami H, Hiraoka K. Biomolecular analysis and cancer diagnostics by negative mode probe electrospray ionization. Analyst 2013; 138:1682-8. [PMID: 23348832 DOI: 10.1039/c3an36554a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We have examined several combinations of solvents and probes with the aim of optimizing the ionization conditions for biomolecules e.g., proteins, peptides and lipids by negative mode probe electrospray ionization mass spectrometry (PESI-MS). With the data presented in this study, negative-mode PESI-MS can be considered as a potential tool for biomolecular analysis and cancer diagnostics because of its simplicity in instrumental configuration. A sharper sampling probe was found to be better for obtaining high quality mass spectra because it can generate stable electrospray without the occurrence of gas breakdown. Although the best conditions may depend on each sample, aqueous organic solvent solutions, especially isopropanol-H(2)O (1/1) with a pH of ≥7, are shown to be preferable for negative-mode PESI-MS, which was successfully applied to colon cancer diagnosis.
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Affiliation(s)
- Mridul Kanti Mandal
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511 Japan.
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Monge ME, Harris GA, Dwivedi P, Fernández FM. Mass Spectrometry: Recent Advances in Direct Open Air Surface Sampling/Ionization. Chem Rev 2013; 113:2269-308. [DOI: 10.1021/cr300309q] [Citation(s) in RCA: 404] [Impact Index Per Article: 36.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- María Eugenia Monge
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332,
United States
| | - Glenn A. Harris
- Department
of Biochemistry and
the Mass Spectrometry Research Center, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Prabha Dwivedi
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332,
United States
| | - Facundo M. Fernández
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332,
United States
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