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Hassan MTA, Chen X, Fnu PIJ, Osonga FJ, Sadik OA, Li M, Chen H. Rapid detection of per- and polyfluoroalkyl substances (PFAS) using paper spray-based mass spectrometry. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133366. [PMID: 38185081 DOI: 10.1016/j.jhazmat.2023.133366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 12/10/2023] [Accepted: 12/22/2023] [Indexed: 01/09/2024]
Abstract
Traditional PFAS analysis by mass spectrometry (MS) is time-consuming, as laborious sample preparation (e.g., extraction and desalting) is necessary. Herein, we report fast detection of PFAS by paper spray (PS)-based MS techniques, which employs a triangular-shaped filter paper for sample loading and ionization (≤ 3 min per sample). In this study, PS-MS was first used for direct PFAS analysis of drinking water, tap water, and wastewater. Interestingly, food package paper materials can be directly cut and examined with PS-MS for possible PFAS contamination. For samples containing salt matrices which would suppress PFAS ion signal, desalting paper spray mass spectrometry (DPS-MS), was shown to be capable of rapidly desalting, ionizing and detecting PFAS species such as per-fluorooctanoic acid (PFOA) and per-fluorosulphonic acid (PFOS). The retention of PFAS on paper substrate while salts being washed away by water is likely due to hydrophilic interaction between the PFAS polar head (e.g., carboxylic acid, sulfonic acid) with the polar filter paper cellulose surface. The DPS-MS method is highly sensitive (limits of detection:1.2-4.5 ppt) and can be applicable for directly analyzing soil extract and soil samples. These results suggest the high potential of PS-MS and the related DPS-MS technique in real-world environmental analysis of PFAS.
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Affiliation(s)
- Md Tanim-Al Hassan
- Department of Chemistry and Environmental Science, New Jersey Institutes of Technology, University Heights, Newark, NJ 07102, USA
| | - Xingzhi Chen
- Department of Chemistry and Environmental Science, New Jersey Institutes of Technology, University Heights, Newark, NJ 07102, USA
| | - Praneeth Ivan Joel Fnu
- Department of Chemistry and Environmental Science, New Jersey Institutes of Technology, University Heights, Newark, NJ 07102, USA
| | - Francis J Osonga
- Department of Chemistry and Environmental Science, New Jersey Institutes of Technology, University Heights, Newark, NJ 07102, USA
| | - Omowunmi A Sadik
- Department of Chemistry and Environmental Science, New Jersey Institutes of Technology, University Heights, Newark, NJ 07102, USA
| | - Mengyan Li
- Department of Chemistry and Environmental Science, New Jersey Institutes of Technology, University Heights, Newark, NJ 07102, USA
| | - Hao Chen
- Department of Chemistry and Environmental Science, New Jersey Institutes of Technology, University Heights, Newark, NJ 07102, USA.
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2
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Millán-Santiago J, Lucena R, Cárdenas S. Nylon 6-cellulose composite hosted in a hypodermic needle: Biofluid extraction and analysis by ambient mass spectrometry in a single device. J Pharm Anal 2023; 13:1346-1352. [PMID: 38174121 PMCID: PMC10759252 DOI: 10.1016/j.jpha.2023.06.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 05/28/2023] [Accepted: 06/27/2023] [Indexed: 01/05/2024] Open
Abstract
This study proposes a hypodermic needle (HN) as a sorbent holder and an electrospray (ESI) emitter, thus combining extraction and analysis in a single device. A novel nylon 6-cellulose (N6-Cel) composite sorbent is proposed to extract methadone from oral fluid samples. The cellulosic substrate provides the composite with high porosity, permitting the flow-through of the sample, while the polyamide contributes to the extraction of the analyte. The low price of the devices (considering the holder and the sorbent) contributes to the affordability of the method, and their small size allows easy transportation, opening the door to on-site extractions. Under the optimum conditions, the analyte can be determined by high-resolution ambient ionization mass spectrometry at a limit of detection (LOD) as low as 0.3 μg/L and precision (expressed as relative standard deviation, RSD) better than 9.3%. The trueness, expressed as relative recovery (RR), ranged from 90% to 109%. As high-resolution mass spectrometers are not available in many laboratories, the method was also adapted to low-resolution spectrometers. In this sense, the direct infusion of the eluates in a triple quadrupole-mass spectrometry provided an LOD of 2.2 μg/L. The RSD was better than 5.3%, and the RR ranged from 96% to 121%.
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Affiliation(s)
- Jaime Millán-Santiago
- Affordable and Sustainable Sample Preparation (AS2P) Research Group, Analytical Chemistry Department, Chemical Institute for Energy and Environment (IQUEMA), University of Cordoba, E-14071, Cordoba, Spain
| | - Rafael Lucena
- Affordable and Sustainable Sample Preparation (AS2P) Research Group, Analytical Chemistry Department, Chemical Institute for Energy and Environment (IQUEMA), University of Cordoba, E-14071, Cordoba, Spain
| | - Soledad Cárdenas
- Affordable and Sustainable Sample Preparation (AS2P) Research Group, Analytical Chemistry Department, Chemical Institute for Energy and Environment (IQUEMA), University of Cordoba, E-14071, Cordoba, Spain
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3
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Kumar BS. Recent Advances and Applications of Ambient Mass Spectrometry Imaging in Cancer Research: An Overview. Mass Spectrom (Tokyo) 2023; 12:A0129. [PMID: 37789912 PMCID: PMC10542858 DOI: 10.5702/massspectrometry.a0129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 08/25/2023] [Indexed: 10/05/2023] Open
Abstract
Cancer metabolic variability has a significant impact on both diagnosis and treatment outcomes. The discovery of novel biological indicators and metabolic dysregulation, can significantly rely on comprehension of the modified metabolism in cancer, is a research focus. Tissue histology is a critical feature in the diagnostic testing of many ailments, such as cancer. To assess the surgical margin of the tumour on patients, frozen section histology is a tedious, laborious, and typically arbitrary method. Concurrent monitoring of ion images in tissues facilitated by the latest advancements in mass spectrometry imaging (MSI) is far more efficient than optical tissue image analysis utilized in conventional histopathology examination. This article focuses on the "desorption electrospray ionization (DESI)-MSI" technique's most recent advancements and uses in cancer research. DESI-MSI can provide wealthy information based on the variances in metabolites and lipids in normal and cancerous tissues by acquiring ion images of the lipid and metabolite variances on biopsy samples. As opposed to a systematic review, this article offers a synopsis of the most widely employed cutting-edge DESI-MSI techniques in cancer research.
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Affiliation(s)
- Bharath S. Kumar
- Correspondence to: Bharath S. Kumar, 21, B2, 27th Street, Nanganallur, Chennai, India, e-mail:
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4
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Mofidfar M, Song X, Kelly JT, Rubenstein MH, Zare RN. Silicone Wristband Spray Ionization Mass Spectrometry for Combined Exposome and Metabolome Profiling. Isr J Chem 2023. [DOI: 10.1002/ijch.202200116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
| | - Xiaowei Song
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | - John T. Kelly
- Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
| | | | - Richard N. Zare
- Department of Chemistry Stanford University Stanford CA 94305 USA
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5
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Song Y, Zhang Y, Xie S, Song X. Screening and diagnosis of triple negative breast cancer based on rapid metabolic fingerprinting by conductive polymer spray ionization mass spectrometry and machine learning. Front Cell Dev Biol 2022; 10:1075810. [PMID: 36589750 PMCID: PMC9798417 DOI: 10.3389/fcell.2022.1075810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 11/22/2022] [Indexed: 12/23/2022] Open
Abstract
We present the use of conductive spray polymer ionization mass spectrometry (CPSI-MS) combined with machine learning (ML) to rapidly gain the metabolic fingerprint from 1 μl liquid extraction from the biopsied tissue of triple-negative breast cancer (TNBC) in China. The 76 discriminative metabolite markers are verified at the primary carcinoma site and can also be successfully tracked in the serum. The Lasso classifier featured with 15- and 22-metabolites detected by CPSI-MS achieve a sensitivity of 88.8% for rapid serum screening and a specificity of 91.1% for tissue diagnosis, respectively. Finally, the expression levels of their corresponding upstream enzymes and transporters have been initially confirmed. In general, CPSI-MS/ML serves as a cost-effective tool for the rapid screening, diagnosis, and precise characterization for the TNBC metabolism reprogramming in the clinical practice.
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Affiliation(s)
- Yaoyao Song
- Department of General Surgery, The Sixth Medical Center of Chinese PLA General Hospital, Beijing, China,Department of Burn and Plastic Surgery, The Fourth Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Yan Zhang
- Department of General Surgery, The Sixth Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Songhai Xie
- Department of Chemistry, Fudan University, Shanghai, China
| | - Xiaowei Song
- Department of Chemistry, Fudan University, Shanghai, China,*Correspondence: Xiaowei Song,
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6
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Zhou W, Pawliszyn J. Coated Blade Spray with a Barrier: Improving Negative Electrospray Ionization and Sample Preparation. Anal Chem 2022; 94:15879-15886. [DOI: 10.1021/acs.analchem.2c04003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Wei Zhou
- Department of Chemistry, University of Waterloo, Waterloo, OntarioN2L 3G1, Canada
| | - Janusz Pawliszyn
- Department of Chemistry, University of Waterloo, Waterloo, OntarioN2L 3G1, Canada
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7
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Wang S, Bai J, Wang K, Guo Y. Carbon fiber paper spray ionization mass spectrometry. Anal Chim Acta 2022; 1232:340477. [DOI: 10.1016/j.aca.2022.340477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/27/2022] [Accepted: 09/29/2022] [Indexed: 11/01/2022]
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Wang X, Hebert DD, Runsewe DO, Pohlman GE, Hoffmann WD, Irvin JA. Electroactive Polymer-Based Spray Ionization for Direct Mass Spectrometric Analysis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:1840-1849. [PMID: 36149251 DOI: 10.1021/jasms.2c00148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Electrochemically deposited electroactive polymer (EAP) films were investigated for their potential to enhance the performance of ambient ionization mass spectrometry (MS). Several EAPs of varying hydrophobicity were evaluated, including the superhydrophobic polymer poly[3,4-(2-dodecylethylenedioxy)thiophene] (PEDOT-C12). The EAPs were electropolymerized onto indium tin oxide-coated glass, placed in front of the inlet of a mass spectrometer, and charged to 3.5-4.5 kV. Analyte solutions were then applied to the surface, initiating ionization events. Analytes including peptides and small molecule pharmaceuticals were studied in 0.1% formic acid in methanol/water ("spray solvent") as well as in synthetic biological fluid matrices, using both EAP spray ionization (EAPSI) and paper spray ionization (PSI). Each EAPSI analysis required as little as 0.1 μL of solution, and the resulting sprays were stable and reproducible. The sensitivity, limit of detection (LOD), and limit of quantification (LOQ) were evaluated using bradykinin, cannabinol, and cannabidiol, which were prepared in pure solvents, artificial urine, and artificial saliva. The limits of detection and quantitation for EAPSI were improved relative to PSI by 1-2 orders of magnitude for analytes prepared in methanol/water and on the same order of magnitude as PSI for analytes prepared in artificial saliva and urine. This EAP-based spray ionization technique offers possibilities for rapid MS analysis with small sample sizes, high accuracy, and miniaturization of MS instruments.
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Affiliation(s)
- Xu Wang
- Materials Science, Engineering and Commercialization Program, Texas State University, San Marcos, Texas 78666, United States
| | - David D Hebert
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
| | - Damilola O Runsewe
- Materials Science, Engineering and Commercialization Program, Texas State University, San Marcos, Texas 78666, United States
| | - Gabriel E Pohlman
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
| | - William D Hoffmann
- Materials Science, Engineering and Commercialization Program, Texas State University, San Marcos, Texas 78666, United States
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
| | - Jennifer A Irvin
- Materials Science, Engineering and Commercialization Program, Texas State University, San Marcos, Texas 78666, United States
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
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9
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Challen B, Cramer R. Advances in ionisation techniques for mass spectrometry-based omics research. Proteomics 2022; 22:e2100394. [PMID: 35709387 DOI: 10.1002/pmic.202100394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 06/09/2022] [Accepted: 06/10/2022] [Indexed: 11/10/2022]
Abstract
Omics analysis by mass spectrometry (MS) is a vast field, with proteomics, metabolomics and lipidomics dominating recent research by exploiting biological MS ionisation techniques. Traditional MS ionisation techniques such as electrospray ionisation have limitations in analyte-specific sensitivity, modes of sampling and throughput, leading to many researchers investigating new ionisation methods for omics research. In this review, we examine the current landscape of these new ionisation techniques, divided into the three groups of (electro)spray-based, laser-based and other miscellaneous ionisation techniques. Due to the wide range of new developments, this review can only provide a starting point for further reading on each ionisation technique, as each have unique benefits, often for specialised applications, which promise beneficial results for different areas in the omics world.
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Affiliation(s)
- Bob Challen
- Department of Chemistry, University of Reading, Whiteknights, Reading, UK
| | - Rainer Cramer
- Department of Chemistry, University of Reading, Whiteknights, Reading, UK
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10
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Hu B, Yao ZP. Electrospray ionization mass spectrometry with wooden tips: A review. Anal Chim Acta 2022; 1209:339136. [PMID: 35569859 DOI: 10.1016/j.aca.2021.339136] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 09/30/2021] [Accepted: 09/30/2021] [Indexed: 12/17/2022]
Abstract
Electrospray ionization (ESI) is a powerful ionization technique in mass spectrometry (MS). There has been an increasing interest for the new development of ESI technique to extend its applications. ESI-MS with wooden tips (wooden-tip ESI-MS), an ESI technique invented in 2011, enabled not only new applications but also new insights into the ESI mechanism. In this review, the technical aspects of wooden-tip ESI-MS are described, the new features of wooden-tip ESI-MS for sampling and ionization of analytes are highlighted, and the important applications of wooden-tip ESI-MS in various fields in the past 10 years, including food safety, forensic investigation, environmental analysis, biomedical analysis and protein study, are summarized. The perspectives on the further development and applications of wooden-tip ESI-MS are also discussed.
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Affiliation(s)
- Bin Hu
- Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Jinan University, Guangzhou, 510632, China.
| | - Zhong-Ping Yao
- State Key Laboratory for Chemical Biology and Drug Discovery, Research Institute for Future Food and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China; State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation) and Shenzhen Key Laboratory of Food Biological Safety Control, Shenzhen Research Institute of The Hong Kong Polytechnic University, Shenzhen, 518057, China.
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11
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Song X, Mofidfar M, Zare RN. Introducing Nafion for In Situ Desalting and Biofluid Profiling in Spray Mass Spectrometry. Front Chem 2022; 9:807244. [PMID: 35145954 PMCID: PMC8821663 DOI: 10.3389/fchem.2021.807244] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 12/21/2021] [Indexed: 12/16/2022] Open
Abstract
We introduce Nafion into the ambient ionization technique of spray mass spectrometry to serve for in situ desalting and direct analysis of biological fluids. Nafion was coated onto the surface of the triangular spray tip as the cation exchange material. Because the sulfonic group from the Nafion membrane effectively exchanges their carried protons with inorganic salt ions (e.g., Na+ and K+), the analyte’s ionization efficiency can be significantly enhanced by reducing ion suppression. The desalting efficiency can reach 90% and the maximum tolerance of the absolute salt amount reaches 100 μmol. The mass spectral profile can also be simplified by removing the multiple adducted ion types from small-molecule drugs and metabolites ([M + Na]+ and [M + K]+), or multiply charged ions formed by proteins ([M + nNa]n+ and [M + nK]n+). Thus, the Nafion coating makes less ambiguous data interpretation collected from spray mass spectrometry for qualitative profiling or quantitative measurement of a target analyte.
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Affiliation(s)
- Xiaowei Song
- Department of Chemistry, Fudan University, Shanghai, China
- Department of Chemistry, Stanford University, Stanford, CA, United States
| | - Mohammad Mofidfar
- Department of Chemistry, Stanford University, Stanford, CA, United States
| | - Richard N. Zare
- Department of Chemistry, Stanford University, Stanford, CA, United States
- *Correspondence: Richard N. Zare,
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12
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Chiu KY, Wang Q, Gunawardena HP, Held M, Faik A, Chen H. Desalting Paper Spay Mass Spectrometry (DPS-MS) for Rapid Detection of Glycans and Glycoconjugates. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY 2021; 469:116688. [PMID: 35386843 PMCID: PMC8981528 DOI: 10.1016/j.ijms.2021.116688] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The detection of glycans and glycoconjugates has gained increasing attention in biological fields. Traditional mass spectrometry (MS)-based methods for glycoconjugate analysis are challenged with poor intensity when dealing with complex biological samples. We developed a desalting paper spray mass spectrometry (DPS-MS) strategy to overcome the issue of signal suppression of carbohydrates in salted buffer. Glycans and glycoconjugates (i.e., glycopeptides, nucleotide sugars, etc.) in non-volatile buffer (e.g., Tris buffer) can be loaded on the paper substrate from which buffers can be removed by washing with ACN/H2O (90/10 v/v) solution. Glycans or glycoconjugates can then be eluted and spray ionized by adding ACN/H2O/formic acid (FA) (10/90/1 v/v/v) solvent and applying a high voltage (HV) to the paper substrate. This work also showed that DPS-MS is applicable for direct detection of intact glycopeptides and nucleotide sugars as well as determination of glycosylation profiling of antibody, such as NIST monoclonal antibody IgG (NISTmAb). NISTmAb was deglycosylated with PNGase F to release N-linked oligosaccharides. Twenty-six N-linked oligosaccharides were detected by DPS-MS within a 5-minute timeframe without the need for further enrichment or derivatization. This work demonstrates that DPS-MS allows fast and sensitive detection of glycans/oligosaccharides and glycosylated species in complex matrices and has great potential in bioanalysis.
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Affiliation(s)
- Kai-Yuan Chiu
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey, USA, 07102
| | - Qi Wang
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey, USA, 07102
| | - Harsha P Gunawardena
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania, USA, 19477
| | - Michael Held
- Deparment of Chemistry and Biochemistry, Ohio University, Athens, Ohio 45701, USA
- Interdisciplinary Program in Molecular and Cellular Biology, Ohio University, Athens, Ohio USA, 45701
| | - Ahmed Faik
- Interdisciplinary Program in Molecular and Cellular Biology, Ohio University, Athens, Ohio USA, 45701
- Department of Environmental and Plant Biology, Ohio University, Athens Ohio, USA, 45701
| | - Hao Chen
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey, USA, 07102
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13
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Song X, Li J, Mofidfar M, Zare RN. Distinguishing between Isobaric Ions Using Microdroplet Hydrogen-Deuterium Exchange Mass Spectrometry. Metabolites 2021; 11:728. [PMID: 34822386 PMCID: PMC8625015 DOI: 10.3390/metabo11110728] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/21/2021] [Accepted: 10/22/2021] [Indexed: 11/16/2022] Open
Abstract
Isobaric ions having the same mass-to-charge ratio cannot be separately identified by mass spectrometry (MS) alone, but this limitation can be overcome by using hydrogen-deuterium exchange (HDX) in microdroplets. Because isobaric ions may contain a varied number of exchangeable sites and different types of functional groups, each one produces a unique MS spectral pattern after droplet spray HDX without the need for MS/MS experiments or introduction of ion mobility measurements. As an example of the power of this approach, isobaric ions in urinary metabolic profiles are identified and used to distinguish between healthy individuals and those having bladder cancer.
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Affiliation(s)
- Xiaowei Song
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA; (X.S.); (M.M.)
- Department of Chemistry, Fudan University, Shanghai 200438, China;
| | - Jia Li
- Department of Chemistry, Fudan University, Shanghai 200438, China;
| | - Mohammad Mofidfar
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA; (X.S.); (M.M.)
| | - Richard N. Zare
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA; (X.S.); (M.M.)
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14
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Wang Q, Bhattarai M, Zhao P, Alnsour T, Held M, Faik A, Chen H. Fast and Sensitive Detection of Oligosaccharides Using Desalting Paper Spray Mass Spectrometry (DPS-MS). JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2020; 31:2226-2235. [PMID: 32910855 PMCID: PMC8189650 DOI: 10.1021/jasms.0c00310] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Conventional mass spectrometry (MS)-based analytical methods for small carbohydrate fragments (oligosaccharides, degree of polymerization 2-12) are time-consuming due to the need for an offline sample pretreatment such as desalting. Herein, we report a new paper spray ionization method, named desalting paper spray (DPS), which employs a piece of triangular filter paper for both sample desalting and ionization. Unlike regular paper spray ionization (PSI) and nanoelectrospray ionization (nanoESI), DPS-MS allows fast and sensitive detection of oligosaccharides in biological samples having complex matrices (e.g., Tris, PBS, HEPES buffers, or urine). When an oligosaccharide sample is loaded onto the filter paper substrate (10 × 5 mm, height × base) made mostly of cellulose, oligosaccharides are adsorbed on the paper via hydrophilic interactions with cellulose. Salts and buffers can be washed away using an ACN/H2O (90/10 v/v) solution, while oligosaccharides can be eluted from the paper using a solution of ACN/H2O/formic acid (FA) (10/90/1 v/v/v) and directly spray-ionized from the tip of the paper. Various saccharides at trace levels (e.g., 50 fmol) in nonvolatile buffer can be quickly analyzed by DPS-MS (<5 min per sample). DPS-MS is also applicable for direct detection of oligosaccharides from glycosyltransferase (GT) reactions, a challenging task that typically requires a radioactive assay. Quantitative analysis of acceptor and product oligosaccharides shows increased product with increased GT enzymes used for the reaction, a result in line with the radioactivity assay. This work suggests that DPS-MS has potential for rapid oligosaccharide analysis from biological samples.
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Affiliation(s)
- Qi Wang
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey
| | - Matrika Bhattarai
- Department of Environmental and Plant Biology & Molecular and Cellular Biology Program, Ohio University, Athens, Ohio
| | - Pengyi Zhao
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey
| | - Tariq Alnsour
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey
| | - Michael Held
- Deparment of Chemistry and Biochemistry, Ohio University, Athens, Ohio
- Corresponding Authors: Hao Chen - Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey. , Ahmed Faik – Department of Environmental and Plant Biology, Ohio University, Athens, Ohio. , Michael Held – Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio.
| | - Ahmed Faik
- Department of Environmental and Plant Biology & Molecular and Cellular Biology Program, Ohio University, Athens, Ohio
- Corresponding Authors: Hao Chen - Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey. , Ahmed Faik – Department of Environmental and Plant Biology, Ohio University, Athens, Ohio. , Michael Held – Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio.
| | - Hao Chen
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey
- Corresponding Authors: Hao Chen - Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey. , Ahmed Faik – Department of Environmental and Plant Biology, Ohio University, Athens, Ohio. , Michael Held – Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio.
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15
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Song X, Chen H, Zare RN. Coulometry-assisted quantitation in spray ionization mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 56:e4628. [PMID: 33245185 DOI: 10.1002/jms.4628] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 06/16/2020] [Accepted: 06/23/2020] [Indexed: 06/11/2023]
Abstract
The concentration of target analyte in a mixture can be quantified by combining coulometric measurements with spray ionization mass spectrometry. A three-electrode system screen printed on the polymer support acts both as the coulometry platform for electrochemical oxidation and the sample loading tip for spray ionization. After loading a droplet of the analyte solution onto the tip, two steps were taken to implement quantitation. First, the electrochemical oxidation potential was optimized with cyclic voltammetry followed by coulometric measurements to calculate the amount of oxidized analyte under a constant low voltage within a fixed period of time (5 s). Then, a high voltage (+4.5 kV) was applied to the tip to trigger spray ionization for measuring the oxidation yield from the native analyte ion and its oxidized product ion intensities by mass spectrometry. The analyte's native concentration is quantified by dividing the oxidized product's concentration (based on Coulomb's law) and the oxidation yield (estimated from mass spectrometry [MS] assuming that the parent and oxidation product have nearly the same ionization efficiencies). The workflow has an advantage in being free of any standard for constructing the quantitation curve. Several model compounds (tyrosine, dopamine, and angiotensin II) were selected for method validation. It was demonstrated that this strategy was feasible with an accuracy of ~15% for a wide coverage of different species including endogenous metabolites and peptides. As an example of its possible practical use, it was initially employed to make a bilirubin assay in urine.
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Affiliation(s)
- Xiaowei Song
- Department of Chemistry, Fudan University, Shanghai, 200438, China
| | - Hao Chen
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ, 07102, USA
| | - Richard N Zare
- Department of Chemistry, Fudan University, Shanghai, 200438, China
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
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