1
|
Hinou H. DHB Matrix with Additives for Direct MALDI Mass Spectrometry of Carbohydrates and Glycoconjugates. TRENDS GLYCOSCI GLYC 2023. [DOI: 10.4052/tigg.2214.1j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
|
2
|
Hinou H. DHB Matrix with Additives for Direct MALDI Mass Spectrometry of Carbohydrates and Glycoconjugates. TRENDS GLYCOSCI GLYC 2023. [DOI: 10.4052/tigg.2214.1e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2023]
|
3
|
Lo CWS, Tsui TKC, Ma RCW, Chan MHM, Ho CS. Quantitation of plasma angiotensin II in healthy Chinese subjects by a validated liquid chromatography tandem mass spectrometry method. Biomed Chromatogr 2022; 36:e5318. [PMID: 34981551 DOI: 10.1002/bmc.5318] [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: 09/07/2021] [Revised: 12/09/2021] [Accepted: 12/13/2021] [Indexed: 11/06/2022]
Abstract
INTRODUCTION Quantitation of plasma angiotensin (Ang) II, the active mediator of the renin-angiotensin system (RAS), is challenging due to its low physiological concentration. We report a validated liquid chromatography-mass spectrometry (LCMS) method to overcome this challenge. METHOD Ang II was extracted from EDTA plasma by an offline solid-phase extraction procedure with Waters MAX μElution plate. LCMS quantitation was performed on the Waters TQS system, monitoring the 3+ ions of the peptide. The analytical performance of the LCMS method was validated. The stability of Ang II was studied with or without the presence of a protease inhibitor. Local reference intervals were established from 143 healthy normotensive subjects (57% female, 21-60 years old). RESULTS The Ang II LCMS method had a measurable range of 3.3 - 700 pmol/L. Between batch precision coefficient of variation was <7% over the Ang II concentrations of 8.6 - 110 pmol/L. No significant matrix interference and carryover was observed. There was no significant difference in Ang II concentration in EDTA blood and plasma for at least 2 hours and 1 hour at room temperature, respectively. Ang II was stable for at least one year when stored at -80 o C, with or without the protease inhibitor. Age-dependent Ang II reference intervals were established: 4.4-17.7 pmol/L (21-30 years) and 3.9-12.8 pmol/L (31-60 years). CONCLUSION The present LCMS method is suitable for quantitation of Ang II to study the RAS system. Ang II collected at room temperature into EDTA bottles was stable at -80 o C for at least 1 year. The first age-dependent reference intervals of plasma Ang II were established for a healthy normotensive Chinese population.
Collapse
Affiliation(s)
- Clara Wai-Shan Lo
- Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Statin, NT, Hong Kong
| | - Teresa Kam-Chi Tsui
- Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Statin, NT, Hong Kong
| | - Ronald Ching-Wan Ma
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT, Hong Kong.,Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT, Hong Kong
| | - Michael Ho-Ming Chan
- Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Statin, NT, Hong Kong
| | - Chung-Shun Ho
- Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Statin, NT, Hong Kong
| |
Collapse
|
4
|
Schäfermann J, Kliewer G, Lösch J, Bednarz H, Giampà M, Niehaus K. Immersion by rotation-based application of the matrix for fast and reproducible sample preparations and robust results in mass spectrometry imaging. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 55:e4488. [PMID: 31826308 DOI: 10.1002/jms.4488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 11/22/2019] [Accepted: 12/08/2019] [Indexed: 06/10/2023]
Abstract
Automated matrix deposition for matrix-assisted laser desorption/ionization (MALDI) mass spectrometry imaging (MSI) is crucial for producing reproducible analyte ion signals. Here we report an innovative method employing an automated immersion apparatus, which enables a robust matrix deposition within 5 minutes and with scalable throughput by using MAPS matrix and non-polar solvents. MSI results received from mouse heart and rat brain tissues were qualitatively similar to those from nozzle sprayed samples with respect to peak number and quality of the ion images. Overall, the immersion-method enables a fast and careful matrix deposition and has the future potential for implementation in clinical tissue diagnostics.
Collapse
Affiliation(s)
- Johanna Schäfermann
- MSI Diagnostics GmbH, Bielefeld, Germany
- Proteome and Metabolome Research, Faculty of Biology, Bielefeld University, Bielefeld, Germany
| | - Georg Kliewer
- MSI Diagnostics GmbH, Bielefeld, Germany
- Proteome and Metabolome Research, Faculty of Biology, Bielefeld University, Bielefeld, Germany
| | | | - Hanna Bednarz
- Center for Biotechnology, Bielefeld University, Bielefeld, Germany
- Proteome and Metabolome Research, Faculty of Biology, Bielefeld University, Bielefeld, Germany
| | - Marco Giampà
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
| | - Karsten Niehaus
- Center for Biotechnology, Bielefeld University, Bielefeld, Germany
- Proteome and Metabolome Research, Faculty of Biology, Bielefeld University, Bielefeld, Germany
| |
Collapse
|
5
|
Li W, Khan M, Li H, Lin L, Mao S, Lin JM. Homogenous deposition of matrix–analyte cocrystals on gold-nanobowl arrays for improving MALDI-MS signal reproducibility. Chem Commun (Camb) 2019; 55:2166-2169. [DOI: 10.1039/c8cc09945f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An Au-nanobowl array was synthesized to utilize its excellent properties to achieve efficient quantitative analysis via MALDI-MS analysis.
Collapse
Affiliation(s)
- Weiwei Li
- Department of Chemistry
- Beijing Key Laboratory of Micronalytical Methods and Instrumentation
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology
- Tsinghua University
- Beijing 100084
| | - Mashooq Khan
- Department of Chemistry
- Beijing Key Laboratory of Micronalytical Methods and Instrumentation
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology
- Tsinghua University
- Beijing 100084
| | - Haifang Li
- Department of Chemistry
- Beijing Key Laboratory of Micronalytical Methods and Instrumentation
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology
- Tsinghua University
- Beijing 100084
| | - Ling Lin
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- CAS Center for Excellence in Nanoscience
- National Center for Nanoscience and Technology
- Beijing 100190
- P. R. China
| | - Sifeng Mao
- Department of Chemistry
- Beijing Key Laboratory of Micronalytical Methods and Instrumentation
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology
- Tsinghua University
- Beijing 100084
| | - Jin-Ming Lin
- Department of Chemistry
- Beijing Key Laboratory of Micronalytical Methods and Instrumentation
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology
- Tsinghua University
- Beijing 100084
| |
Collapse
|
6
|
John H, Rychlik M, Thiermann H, Schmidt C. Simultaneous quantification of atropine and scopolamine in infusions of herbal tea and Solanaceae plant material by matrix-assisted laser desorption/ionization time-of-flight (tandem) mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:1911-1921. [PMID: 30117208 DOI: 10.1002/rcm.8264] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 08/09/2018] [Accepted: 08/09/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Atropine (Atr) and scopolamine (Scp) are toxic secondary plant metabolites of species within the Solanaceae genus that can accidentally or intentionally reach the food store chain by inaccurate harvesting of any plant material, e.g. for herbal tea infusions. Ingestion may cause severe anticholinergic poisoning thus requiring risk-oriented determination in food and beverages. The suitability of matrix-assisted laser desorption/ionization time-of-flight (tandem) mass spectrometry, MALDI-TOF MS(/MS), should be characterized for simultaneous analysis. METHODS We herein present the first MALDI-TOF MS(/MS) procedure for quantitative determination of both alkaloids in herbal tea infusions and Solanaceae plant material. A standard additions procedure using triply deuterated Atr as internal standard was developed and validated. RESULTS Tropane alkaloids were detected without interferences and the standard additions procedure allowed reliable quantification. Intraday and interday precision were less than 17% and corresponding accuracies were between 77% and 112%. Limits of detection in the spotting solution were found at 5 ng/mL (Atr) and 0.5 ng/mL (Scp). The assay was applied to diverse tea infusions as well as to berries and leaves of deadly nightshade and angel's trumpet. CONCLUSIONS The usefulness of MALDI-TOF MS(/MS) for investigations of plant-derived samples to prove contaminations by small basic compounds was demonstrated. The elaborate procedure is reliable but quite laborious to obtain quantitative results, but MALDI-TOF MS(/MS) was also shown to be a valuable tool for rapid qualitative screening for Atr and Scp in plant extracts.
Collapse
Affiliation(s)
- Harald John
- Bundeswehr Institute of Pharmacology and Toxicology, Munich, Germany
| | - Michael Rychlik
- Analytical Food Chemistry, Technische Universität München, Munich, Germany
| | - Horst Thiermann
- Bundeswehr Institute of Pharmacology and Toxicology, Munich, Germany
| | - Christian Schmidt
- Bundeswehr Institute of Pharmacology and Toxicology, Munich, Germany
| |
Collapse
|
7
|
Ou YM, Kuo SY, Lee H, Chang HT, Wang YS. An Efficient Sample Preparation Method to Enhance Carbohydrate Ion Signals in Matrix-assisted Laser Desorption/Ionization Mass Spectrometry. J Vis Exp 2018. [PMID: 30102274 DOI: 10.3791/57660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Sample preparation is a critical process in mass spectrometry (MS) analysis of carbohydrates. Although matrix-assisted laser desorption/ionization (MALDI) MS is the method of choice in carbohydrate analysis, poor ion signal and data reproducibility of carbohydrate samples continue to be severe problems. For quantitative analysis of carbohydrates, an effective analytical protocol providing superior data quality is necessary. This video demonstrates sample preparation protocols to improve signal intensity and minimize data variation of carbohydrates in MALDI-MS. After drying and crystallization of sample droplets, the crystal morphology is reformed by methanol before mass spectrometric analysis. The enhancement in carbohydrate signal is examined with MALDI imaging mass spectrometry (IMS). Experimental results show that crystal reformation adjusts crystalline structures and redistributes carbohydrate analytes. In comparison with the dried droplet preparation method in conventional MALDI-MS, reforming carbohydrate crystal morphologies with methanol shows significantly better signal intensity, ion image distribution, and data stability. Since the protocols demonstrated herein do not involve changes in sample composition, they are generally applicable to various carbohydrates and matrixes.
Collapse
Affiliation(s)
- Yu-Meng Ou
- Genomic Research Center, Academia Sinica; Department of Chemistry, National Taiwan University
| | | | - Hsun Lee
- Genomic Research Center, Academia Sinica
| | | | | |
Collapse
|
8
|
Kernalléguen A, Steinhoff R, Bachler S, Dittrich PS, Saint-Marcoux F, El Bakhi S, Vorspan F, Léonetti G, Lafitte D, Pélissier-Alicot AL, Zenobi R. High-Throughput Monitoring of Cocaine and Its Metabolites in Hair Using Microarrays for Mass Spectrometry and Matrix-Assisted Laser Desorption/Ionization-Tandem Mass Spectrometry. Anal Chem 2018; 90:2302-2309. [DOI: 10.1021/acs.analchem.7b04693] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Angéline Kernalléguen
- Department
of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
- Aix Marseille University, INSERM, CRO2, UMR_S
911, PIT2, 13005 Marseille, France
- Aix Marseille University, CNRS, EFS, ADES UMR
7268, 13005 Marseille, France
| | - Robert Steinhoff
- Department
of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Simon Bachler
- Bioanalytics
Group, Department of Biosystems Science and Engineering, ETH Zurich, 4058 Basel, Switzerland
| | - Petra S. Dittrich
- Bioanalytics
Group, Department of Biosystems Science and Engineering, ETH Zurich, 4058 Basel, Switzerland
| | | | - Souleiman El Bakhi
- Laboratoire
de Pharmacologie et Toxicologie, CHU Limoges, 87000 Limoges, France
| | - Florence Vorspan
- Services
de Psychiatrie et de Médecine Addictologique, Hôpital Fernand Widal, APHP, 75475 Paris, France
- Universités Paris Descartes-Paris Diderot, INSERM UMR-S
1114, 75013 Paris France
| | - Georges Léonetti
- Aix Marseille University, CNRS, EFS, ADES UMR
7268, 13005 Marseille, France
- Aix Marseille University, APHM, CHU Timone, Service de
Médecine Légale, 13005 Marseille, France
| | - Daniel Lafitte
- Aix Marseille University, INSERM, CRO2, UMR_S
911, PIT2, 13005 Marseille, France
| | | | - Renato Zenobi
- Department
of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| |
Collapse
|
9
|
Chen Z, Zhong X, Tie C, Chen B, Zhang X, Li L. Development of a hydrophilic interaction liquid chromatography coupled with matrix-assisted laser desorption/ionization-mass spectrometric imaging platform for N-glycan relative quantitation using stable-isotope labeled hydrazide reagents. Anal Bioanal Chem 2017; 409:4437-4447. [PMID: 28540462 DOI: 10.1007/s00216-017-0387-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Revised: 04/20/2017] [Accepted: 04/28/2017] [Indexed: 12/21/2022]
Abstract
In this work, the capability of newly developed hydrophilic interaction liquid chromatography (HILIC) coupled with matrix-assisted laser desorption/ionization-mass spectrometric imaging (MALDI-MSI) platform for quantitative analysis of N-glycans has been demonstrated. As a proof-of-principle experiment, heavy and light stable-isotope labeled hydrazide reagents labeled maltodextrin ladder were used to demonstrate the feasibility of the HILIC-MALDI-MSI platform for reliable quantitative analysis of N-glycans. MALDI-MSI analysis by an Orbitrap mass spectrometer enabled high-resolution and high-sensitivity detection of N-glycans eluted from HILIC column, allowing the re-construction of LC chromatograms as well as accurate mass measurements for structural inference. MALDI-MSI analysis of the collected LC traces showed that the chromatographic resolution was preserved. The N-glycans released from human serum was used to demonstrate the utility of this novel platform in quantitative analysis of N-glycans from a complex sample. Benefiting from the minimized ion suppression provided by HILIC separation, comparison between MALDI-MS and the newly developed platform HILIC-MALDI-MSI revealed that HILIC-MALDI-MSI provided higher N-glycan coverage as well as better quantitation accuracy in the quantitative analysis of N-glycans released from human serum. Graphical abstract Reconstructed chromatograms based on HILIC-MALDI-MSI results of heavy and light labeled maltodextrin enabling quantitative glycan analysis.
Collapse
Affiliation(s)
- Zhengwei Chen
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, WI, 53706, USA
| | - Xuefei Zhong
- School of Pharmacy, University of Wisconsin, 777 Highland Avenue, Madison, WI, 53705, USA
| | - Cai Tie
- College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Bingming Chen
- School of Pharmacy, University of Wisconsin, 777 Highland Avenue, Madison, WI, 53705, USA
| | - Xinxiang Zhang
- College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Lingjun Li
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, WI, 53706, USA.
- School of Pharmacy, University of Wisconsin, 777 Highland Avenue, Madison, WI, 53705, USA.
- School of Life Sciences, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin, 300072, China.
| |
Collapse
|
10
|
Klont F, Ten Hacken NHT, Horvatovich P, Bakker SJL, Bischoff R. Assuring Consistent Performance of an Insulin-Like Growth Factor 1 MALDImmunoassay by Monitoring Measurement Quality Indicators. Anal Chem 2017; 89:6188-6195. [PMID: 28467045 PMCID: PMC5463271 DOI: 10.1021/acs.analchem.7b01125] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Analytical
methods based on mass spectrometry (MS) have been successfully
applied in biomarker discovery studies, while the role of MS in translating
biomarker candidates to clinical diagnostics is less pronounced. MALDImmunoassays—methods
that combine immunoaffinity enrichment with matrix-assisted laser
desorption ionization time-of-flight (MALDI-TOF) mass spectrometric
detection—are attractive analytical approaches for large-scale
sample analysis by virtue of their ease of operation and high-throughput
capabilities. Despite this fact, MALDImmunoassays are not widely used
in clinical diagnostics, which is mainly due to the limited availability
of internal standards that can adequately correct for variability
in sample preparation and the MALDI process itself. Here we present
a novel MALDImmunoassay for quantification of insulin-like growth
factor 1 (IGF1) in human plasma. Reliable IGF1 quantification in the
range of 10–1000 ng/mL was achieved by employing 15N-IGF1 as internal standard, which proved to be an essential feature
of the IGF1 MALDImmunoassay. The method was validated according to
U.S. Food and Drug Administration (FDA) guidelines, which included
demonstrating the effectiveness of IGF1/IGF binding protein (IGF1/IGFBP)
complex dissociation using sodium dodecyl sulfate (SDS). Furthermore,
the MALDImmunoassay compared well with the IDS-iSYS IGF1 immunoassay
with high correlation (R2 = 0.99), although
substantially lower levels were reported by the MALDImmunoassay. The
method was tested on >1000 samples from a cohort of renal transplant
recipients to assess its performance in a clinical setting. On the
basis of this study, we identified readouts to monitor the quality
of the measurements. Our work shows that MALDI-TOF mass spectrometry
is suitable for quantitative biomarker analysis provided that an appropriate
internal standard is used and that readouts are monitored to assess
the quality of the measurements.
Collapse
Affiliation(s)
- Frank Klont
- Analytical Biochemistry, Department of Pharmacy, University of Groningen , Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | | | - Péter Horvatovich
- Analytical Biochemistry, Department of Pharmacy, University of Groningen , Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | | | - Rainer Bischoff
- Analytical Biochemistry, Department of Pharmacy, University of Groningen , Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| |
Collapse
|
11
|
Wang P, Giese RW. Recommendations for quantitative analysis of small molecules by matrix-assisted laser desorption ionization mass spectrometry. J Chromatogr A 2017; 1486:35-41. [PMID: 28118972 DOI: 10.1016/j.chroma.2017.01.040] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 12/21/2016] [Accepted: 01/16/2017] [Indexed: 12/15/2022]
Abstract
Matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) has been used for quantitative analysis of small molecules for many years. It is usually preceded by an LC separation step when complex samples are tested. With the development several years ago of "modern MALDI" (automation, high repetition laser, high resolution peaks), the ease of use and performance of MALDI as a quantitative technique greatly increased. This review focuses on practical aspects of modern MALDI for quantitation of small molecules conducted in an ordinary way (no special reagents, devices or techniques for the spotting step of MALDI), and includes our ordinary, preferred methods The review is organized as 18 recommendations with accompanying explanations, criticisms and exceptions.
Collapse
Affiliation(s)
- Poguang Wang
- Department of Pharmaceutical Sciences and Barnett Institute, Bouve College, Northeastern University, Boston, MA 02115, USA
| | - Roger W Giese
- Department of Pharmaceutical Sciences and Barnett Institute, Bouve College, Northeastern University, Boston, MA 02115, USA.
| |
Collapse
|
12
|
Hosseini S, Martinez-Chapa SO. Principles and Mechanism of MALDI-ToF-MS Analysis. FUNDAMENTALS OF MALDI-TOF-MS ANALYSIS 2017. [DOI: 10.1007/978-981-10-2356-9_1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
13
|
Rzagalinski I, Volmer DA. Quantification of low molecular weight compounds by MALDI imaging mass spectrometry - A tutorial review. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2016; 1865:726-739. [PMID: 28012871 DOI: 10.1016/j.bbapap.2016.12.011] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Revised: 12/01/2016] [Accepted: 12/19/2016] [Indexed: 10/20/2022]
Abstract
Matrix-assisted laser desorption/ionization (MALDI)-mass spectrometry imaging (MSI) permits label-free in situ analysis of chemical compounds directly from the surface of two-dimensional biological tissue slices. It links qualitative molecular information of compounds to their spatial coordinates and distribution within the investigated tissue. MALDI-MSI can also provide the quantitative amounts of target compounds in the tissue, if proper calibration techniques are performed. Obviously, as the target molecules are embedded within the biological tissue environment and analysis must be performed at their precise locations, there is no possibility for extensive sample clean-up routines or chromatographic separations as usually performed with homogenized biological materials; ion suppression phenomena therefore become a critical side effect of MALDI-MSI. Absolute quantification by MALDI-MSI should provide an accurate value of the concentration/amount of the compound of interest in relatively small, well-defined region of interest of the examined tissue, ideally in a single pixel. This goal is extremely challenging and will not only depend on the technical possibilities and limitations of the MSI instrument hardware, but equally on the chosen calibration/standardization strategy. These strategies are the main focus of this article and are discussed and contrasted in detail in this tutorial review. This article is part of a Special Issue entitled: MALDI Imaging, edited by Dr. Corinna Henkel and Prof. Peter Hoffmann.
Collapse
Affiliation(s)
- Ignacy Rzagalinski
- Institute of Bioanalytical Chemistry, Saarland University, 66123 Saarbrücken, Germany
| | - Dietrich A Volmer
- Institute of Bioanalytical Chemistry, Saarland University, 66123 Saarbrücken, Germany.
| |
Collapse
|
14
|
Wang CC, Lai YH, Ou YM, Chang HT, Wang YS. Critical factors determining the quantification capability of matrix-assisted laser desorption/ionization- time-of-flight mass spectrometry. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2016; 374:rsta.2015.0371. [PMID: 27644968 PMCID: PMC5031637 DOI: 10.1098/rsta.2015.0371] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/17/2016] [Indexed: 05/03/2023]
Abstract
Quantitative analysis with mass spectrometry (MS) is important but challenging. Matrix-assisted laser desorption/ionization (MALDI) coupled with time-of-flight (TOF) MS offers superior sensitivity, resolution and speed, but such techniques have numerous disadvantages that hinder quantitative analyses. This review summarizes essential obstacles to analyte quantification with MALDI-TOF MS, including the complex ionization mechanism of MALDI, sensitive characteristics of the applied electric fields and the mass-dependent detection efficiency of ion detectors. General quantitative ionization and desorption interpretations of ion production are described. Important instrument parameters and available methods of MALDI-TOF MS used for quantitative analysis are also reviewed.This article is part of the themed issue 'Quantitative mass spectrometry'.
Collapse
Affiliation(s)
- Chia-Chen Wang
- Department of Biochemistry, National Yang-Ming University, No. 155, Section 2, Linong Street, Taipei 112, Taiwan, Republic of China Genomics Research Center, Academia Sinica, 128 Academia Road, Section 2, Taipei 115, Taiwan, Republic of China
| | - Yin-Hung Lai
- Genomics Research Center, Academia Sinica, 128 Academia Road, Section 2, Taipei 115, Taiwan, Republic of China
| | - Yu-Meng Ou
- Genomics Research Center, Academia Sinica, 128 Academia Road, Section 2, Taipei 115, Taiwan, Republic of China Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
| | - Huan-Tsung Chang
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
| | - Yi-Sheng Wang
- Department of Biochemistry, National Yang-Ming University, No. 155, Section 2, Linong Street, Taipei 112, Taiwan, Republic of China Genomics Research Center, Academia Sinica, 128 Academia Road, Section 2, Taipei 115, Taiwan, Republic of China
| |
Collapse
|
15
|
Yang J, Zhu J, Pei R, Oliver JA, Landry DW, Stojanovic MN, Lin Q. Integrated Microfluidic Aptasensor for Mass Spectrometric Detection of Vasopressin in Human Plasma Ultrafiltrate. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2016; 8:5190-5196. [PMID: 28090219 PMCID: PMC5228624 DOI: 10.1039/c5ay02979a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a microfluidic aptamer-based biosensor for detection of low-molecular-weight biomarkers in patient samples. Using a microfluidic device that integrates aptamer-based specific analyte extraction, isocratic elution, and detection by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, we demonstrate rapid, sensitive and label-free detection of arginine vasopressin (AVP) in human plasma ultrafiltrate. AVP molecules in complex matrices are specifically captured by an aptamer that is immobilized on microbeads via affinity binding in a microchamber. After the removal of unbound, contaminating molecules through washing, aptamer-AVP complexes are thermally disrupted via on-chip temperature control. Released AVP molecules are eluted with purified water and transferred to a separate microchamber, and deposited onto a single spot on a MALDI plate via repeated, piezoelectrically actuated ejection, which enriches AVP molecules over the spot area. This integrated on-chip sample processing enables the quantitative detection of low-abundance AVP by MALDI-TOF mass spectrometry in a rapid and label-free manner. Our experimental results show the detection of AVP in human plasma ultrafiltrate as low as physiologically relevant picomolar concentrations via aptamer-based selective preconcentration, demonstrating the potential of our approach as a rapid (~ 1hr), sensitive clinical AVP assay.
Collapse
Affiliation(s)
- J. Yang
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, United States
| | - J. Zhu
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, United States
| | - R. Pei
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, China
| | - J. A. Oliver
- Department of Medicine, Columbia University, New York, NY 10032, United States
| | - D. W. Landry
- Department of Medicine, Columbia University, New York, NY 10032, United States
| | - M. N. Stojanovic
- Department of Medicine, Columbia University, New York, NY 10032, United States
| | - Q. Lin
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, United States
| |
Collapse
|
16
|
Ahn SH, Park KM, Moon JH, Lee SH, Kim MS. Preparation of Homogeneous Solid Samples for Reproducible and Quantitative MALDI. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.10704] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Sung Hee Ahn
- Department of Chemistry; Seoul National University; Seoul 151-747 Korea
| | - Kyung Man Park
- Department of Chemistry; Seoul National University; Seoul 151-747 Korea
| | - Jeong Hee Moon
- Functional Genomics Research Center, KRIBB; Daejeon 305-806 Korea
| | - Seong Hoon Lee
- Department of Chemistry; Seoul National University; Seoul 151-747 Korea
| | - Myung Soo Kim
- Seoul National University Research Institute for Basic Sciences; Seoul 151-747 Korea
- Center for Nanoparticle Research, Institute for Basic Science (IBS); Seoul 151-742 Korea
| |
Collapse
|
17
|
Smolira A, Hałas S, Wessely-Szponder J. Quantification of the PR-39 cathelicidin compound in porcine blood by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2015; 29:1811-1816. [PMID: 26331932 DOI: 10.1002/rcm.7284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 07/20/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE The PR-39 porcine cathelicidin occurs naturally in animal neutrophils. Its main function is antimicrobial activity, which potentially can be used in antibiotic treatments in veterinary medicine. Investigations concerning such a use require the detection and quantification of PR-39 in a given sample. The aim of this work is to determine the concentration of PR-39 contained in porcine blood. METHODS Prior to matrix-assisted laser desorption/ionization (MALDI) analysis, the porcine blood sample was subjected to crude extraction in order to release the active form of PR-39 from the neutrophil granules. Next, gel filtration chromatography was performed to separate PR-39 from other cathelicidins present in porcine blood. Positive ion MALDI time-of-flight (TOF) mass spectra of the resulting portion of lyophilisate with unknown PR-39 content were acquired in linear mode. To quantify PR-39 in the lyophilisate sample, the standard addition method was applied. The PR-39 concentration obtained in the lyophilisate sample was then converted into the peptide concentration in porcine blood. RESULTS The linear fit function of the constructed calibration curve indicates an excellent correlation between the PR-39 peak intensity and the added quantity of synthetic PR-39 (R(2) = 0.994) and a low relative standard deviation of the slope = 1.98%. From the x-intercept of the straight line, we estimated the PR-39 concentration in porcine blood to be 20.5 ± 4.6 ng/mL. CONCLUSIONS The MALDI method was successfully applied for the quantitative analysis of PR-39 found in porcine blood. Compared with other available methods, it is relatively easy, inexpensive and not time-consuming. Despite the method having lower accuracy than the enzyme-linked immunosorbent assay (ELISA), the results obtained here, by a much simpler method, are in good agreement with the literature data.
Collapse
Affiliation(s)
- Anna Smolira
- Mass Spectrometry Laboratory, Institute of Physics, Maria Curie Sklodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031, Lublin, Poland
| | - Stanisław Hałas
- Mass Spectrometry Laboratory, Institute of Physics, Maria Curie Sklodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031, Lublin, Poland
| | - Joanna Wessely-Szponder
- Department of Pathophysiology, Chair of Preclinical Veterinary Sciences, Faculty of Veterinary Medicine, University of Life Sciences, Akademicka 12, 20-033, Lublin, Poland
| |
Collapse
|
18
|
Wei Y, Zhang Y, Lin Y, Li L, Liu J, Wang Z, Xiong S, Zhao Z. A uniform 2,5-dihydroxybenzoic acid layer as a matrix for MALDI-FTICR MS-based lipidomics. Analyst 2015; 140:1298-305. [DOI: 10.1039/c4an01964d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A very uniform 2,5-dihydroxybenzoic acid (DHB)–analyte co-crystal was skillfully constructed for lipidomics study by MALDI-FTICR MS.
Collapse
Affiliation(s)
- Yanbo Wei
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Analytical Chemistry for Living Biosystems
- Institute of Chemistry Chinese Academy of Sciences
- Beijing 100190
- China
| | - Yangyang Zhang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Analytical Chemistry for Living Biosystems
- Institute of Chemistry Chinese Academy of Sciences
- Beijing 100190
- China
| | - Yu Lin
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Analytical Chemistry for Living Biosystems
- Institute of Chemistry Chinese Academy of Sciences
- Beijing 100190
- China
| | - Lin Li
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Analytical Chemistry for Living Biosystems
- Institute of Chemistry Chinese Academy of Sciences
- Beijing 100190
- China
| | - Jian'an Liu
- Beijing Mass Spectrum Center
- Beijing 100190
- China
| | | | | | - Zhenwen Zhao
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Analytical Chemistry for Living Biosystems
- Institute of Chemistry Chinese Academy of Sciences
- Beijing 100190
- China
| |
Collapse
|
19
|
Pabst M, Fagerer SR, Köhling R, Küster SK, Steinhoff R, Badertscher M, Wahl F, Dittrich PS, Jefimovs K, Zenobi R. Self-Aliquoting Microarray Plates for Accurate Quantitative Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry. Anal Chem 2013; 85:9771-6. [DOI: 10.1021/ac4021775] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Martin Pabst
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse
10, 8093 Zürich, Switzerland
| | - Stephan R. Fagerer
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse
10, 8093 Zürich, Switzerland
| | - Rudolf Köhling
- Sigma-Aldrich, Industriestrasse 25, 9471 Buchs, Switzerland
| | - Simon K. Küster
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse
10, 8093 Zürich, Switzerland
| | - Robert Steinhoff
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse
10, 8093 Zürich, Switzerland
| | - Martin Badertscher
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse
10, 8093 Zürich, Switzerland
| | - Fabian Wahl
- Sigma-Aldrich, Industriestrasse 25, 9471 Buchs, Switzerland
| | - Petra S. Dittrich
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse
10, 8093 Zürich, Switzerland
| | - Konstantins Jefimovs
- Swiss Federal Laboratories for Material Science and Technology EMPA, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Renato Zenobi
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Strasse
10, 8093 Zürich, Switzerland
| |
Collapse
|
20
|
Huang L, Xiao X, Xie Y, Kageruka H, Zhou Y, Deng F, Zhong H. Compressed matrix thin film (CMTF)-assisted laser desorption ionization mass spectrometric analysis. Anal Chim Acta 2013; 786:85-94. [DOI: 10.1016/j.aca.2013.05.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Revised: 04/30/2013] [Accepted: 05/03/2013] [Indexed: 12/25/2022]
|
21
|
Wei Y, Li S, Wang J, Shu C, Liu J, Xiong S, Song J, Zhang J, Zhao Z. Polystyrene Spheres-Assisted Matrix-Assisted Laser Desorption Ionization Mass Spectrometry for Quantitative Analysis of Plasma Lysophosphatidylcholines. Anal Chem 2013; 85:4729-34. [DOI: 10.1021/ac400452k] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | | | | | | | | | | | - Jianwen Song
- Key Laboratory of Cell Proliferation
and Regulation Biology, Ministry of Education, Institute of Cell Biology,
College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Junjie Zhang
- Key Laboratory of Cell Proliferation
and Regulation Biology, Ministry of Education, Institute of Cell Biology,
College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | | |
Collapse
|
22
|
Cunsolo V, Muccilli V, Saletti R, Foti S. MALDI-TOF mass spectrometry for the monitoring of she-donkey's milk contamination or adulteration. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:148-153. [PMID: 23378086 DOI: 10.1002/jms.3138] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Revised: 10/30/2012] [Accepted: 11/06/2012] [Indexed: 06/01/2023]
Abstract
Donkey's milk (DM), representing a safe and alternative food in both IgE-mediated and non-IgE-mediated cow's milk protein allergy, can be categorized as precious pharma-food. Moreover, an economically relevant interest for the use of DM in cosmetology is also developing. The detection of adulterations and contaminations of DM is a matter of fundamental importance from both an economic and allergenic standpoint, and, to this aim, fast and efficient analytical approaches to assess the authenticity of this precious nutrient are desirable. Here, a rapid matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry (MALDI-TOF MS)-based method aimed to the detection of bovine or caprine milk in raw DM is reported. The presence of the extraneous milks was revealed by monitoring the protein profiles of the most abundant whey proteins, α-lactalbumin (α-LA) and β-lactoglobulin, used as molecular markers. The possibility of obtaining a quantitative analysis of the level of cow or goat milk in DM based on the MALDI-TOF peak areas of α-LAs was also explored. The results showed that the experimental quantitative values were in good agreement with the real composition of each mixture. As pretreatment of the milk samples is not required, and owing to the speed and the high sensitivity of MALDI-MS, the protocol here reported could represent a reliable method for routine analyses aimed to assess the absence of contamination in raw fresh DM samples.
Collapse
Affiliation(s)
- Vincenzo Cunsolo
- Department of Chemical Science, University of Catania, Viale A. Doria 6, 95125, Catania, Italy.
| | | | | | | |
Collapse
|
23
|
Lim AY, Ma J, Boey YCF. Development of nanomaterials for SALDI-MS analysis in forensics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:4211-4216. [PMID: 23030036 DOI: 10.1002/adma.201200027] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Within the last decade, the escalation of research output in the field of nanotechnology has spurred the development of new nanomaterials for use as assisting agents in surface assisted laser desorption ionization mass spectrometry (SALDI-MS). Specifically modified nanomaterials, coupled with mass spectrometry, have improved the detection sensitivity, specificity, flexibility and reproducibility of SALDI-MS analysis. The technological advancement of LDI-MS has in turn, propelled the use of the analytical technique in the field of forensics. In this report, the various roles and applications of metal-, silicon- and carbon-based nanostructured materials as SALDI matrices in the analysis of forensic samples are described. The advantages of SALDI-MS as an analytical tool for forensic sample analysis are also discussed.
Collapse
Affiliation(s)
- Angelina Yimei Lim
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.
| | | | | |
Collapse
|
24
|
Stewart KW, Phillips ARJ, Whiting L, Jüllig M, Middleditch MJ, Cooper GJS. A simple and rapid method for identifying and semi-quantifying peptide hormones in isolated pancreatic islets by direct-tissue matrix-assisted laser desorption ionization time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:3387-3395. [PMID: 22002691 DOI: 10.1002/rcm.5239] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We describe a new, simple, robust and efficient method based on direct-tissue matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry that enables consistent semi-quantitation of peptide hormones in isolated pancreatic islets from normal and diabetic rodents. Prominent signals were measured that corresponded to all the main peptide hormones present in islet-endocrine cells: (α-cells) glucagon, glicentin-related polypeptide/GRPP; (β-cells) insulin I, insulin II, C-peptide I, C-peptide II, amylin; (δ-cells) somatostatin-14; and (PP-cells), and pancreatic polypeptide. The signal ratios coincided with known relative hormone abundances. The method demonstrated that severe insulin deficiency is accompanied by elevated levels of all non-β-cell-hormones in diabetic rat islets, consistent with alleviation of paracrine suppression of hormone production by non-β-cells. It was also effective in characterizing hormonal phenotype in hemizygous human-amylin transgenic mice that express human and mouse amylin in approx. equimolar quantities. Finally, the method demonstrated utility in basic peptide-hormone discovery by identifying a prominent new Gcg-gene-derived peptide (theoretical monoisotopic molecular weight 3263.5 Da), closely related to but distinct from GRPP, in diabetic islets. This peptide, whose sequence is HAPQDTEENARSFPASQTEPLEDPNQINE in Rattus norvegicus, could be a peptide hormone whose roles in physiology and metabolic disease warrant further investigation. This method provides a powerful new approach that could provide important new insights into the physiology and regulation of peptide hormones in islets and other endocrine tissues. It has potentially wide-ranging applications that encompass endocrinology, pharmacology, phenotypic analysis in genetic models of metabolic disease, and hormone discovery, and could also effectively limit the numbers of animals required for such studies.
Collapse
|
25
|
Danielewicz MA, Anderson LA, Franz AK. Triacylglycerol profiling of marine microalgae by mass spectrometry. J Lipid Res 2011; 52:2101-8. [PMID: 21840867 PMCID: PMC3196241 DOI: 10.1194/jlr.d018408] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 08/08/2011] [Indexed: 11/20/2022] Open
Abstract
We present a method for the determination of triacylglycerol (TAG) profiles of oleaginous saltwater microalgae relevant for the production of biofuels, bioactive lipids, and high-value lipid-based chemical precursors. We describe a technique to remove chlorophyll using quick, simple solid phase extraction (SPE) and directly compare the intact TAG composition of four microalgae species (Phaeodactylum tricornutum, Nannochloropsis salina, Nannochloropsis oculata, and Tetraselmis suecica) using MALDI time-of-flight (TOF) mass spectrometry (MS), ESI linear ion trap-orbitrap (LTQ Orbitrap) MS, and ¹H NMR spectroscopy. Direct MS analysis is particularly effective to compare the polyunsaturated fatty acid (PUFA) composition for triacylglycerols because oxidation can often degrade samples upon derivatization. Using these methods, we observed that T. suecica contains significant PUFA levels with respect to other microalgae. This method is applicable for high-throughput MS screening of microalgae TAG profiles and may aid in the commercial development of biofuels.
Collapse
|
26
|
Chen SY, Juang YM, Chien MW, Li KI, Yu CS, Lai CC. Magnetic iron oxide nanoparticle enrichment of phosphopeptides on a radiate microstructure MALDI chip. Analyst 2011; 136:4454-9. [PMID: 21897971 DOI: 10.1039/c1an15334j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several methods can be used to improve the enrichment of phosphorylated proteins. In this paper, phosphopeptides were enriched using magnetic iron(II,III) oxide (magnetite, Fe(3)O(4)) nanoparticles (NPs) on a radiate microstructure silicon chip and then analyzed using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) without further purification processes. We have developed a radiate microstructure chip on which samples can be concentrated for analysis by MALDI-TOFMS. The phosphoprotein digests and magnetic iron oxide NPs aqueous solution were deposited onto the central zone of the radiate microstructure silicon chip and enabled the on-chip enrichment of phosphopeptides. Microscopic analysis confirmed that the applied samples were confined to the central zone. Sample spots focused on the chip were much smaller than those on an unmodified plate with the same total volume. Different additives were used and optimized processes were performed to minimize non-phosphopeptides interference. These data collectively demonstrate that our on-chip phosphopeptide enrichment protocol is a rapid and easy-to-use method for phosphoproteome analysis.
Collapse
Affiliation(s)
- Shun-Yuan Chen
- Institute of Molecular Biology, National Chung Hsing University, Taichung, Taiwan
| | | | | | | | | | | |
Collapse
|
27
|
Colantonio S, Simpson JT, Fisher RJ, Yavlovich A, Belanger JM, Puri A, Blumenthal R. Quantitative analysis of phospholipids using nanostructured laser desorption ionization targets. Lipids 2011; 46:469-77. [PMID: 21327726 PMCID: PMC3238685 DOI: 10.1007/s11745-010-3493-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Accepted: 10/20/2010] [Indexed: 10/18/2022]
Abstract
Since its introduction as an ionization technique in mass spectrometry, matrix-assisted laser desorption ionization (MALDI) has been applied to a wide range of applications. Quantitative small molecule analysis by MALDI, however, is limited due to the presence of intense signals from the matrix coupled with non-homogeneous surfaces. The surface used in nano-structured laser desorption ionization (NALDI) eliminates the need for a matrix and the resulting interferences, and allows for quantitative analysis of small molecules. This study was designed to analyze and quantitate phospholipid components of liposomes. Here we have developed an assay to quantitate the DPPC and DC(8,9)PC in liposomes by NALDI following various treatments. To test our method we chose to analyze a liposome system composed of DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine) and DC(8,9)PC (1,2-bis(tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine), as DC(8,9)PC is known to undergo cross-linking upon treatment with UV (254 nm) and this reaction converts the monomer into a polymer. First, calibration curves for pure lipids (DPPC and DC(8,9)PC) were created using DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine) as an internal standard. The calibration curve for both DPPC and DC(8,9)PC showed an R(2) of 0.992, obtained using the intensity ratio of analyte and internal standard. Next, DPPC:DC(8,9)PC liposomes were treated with UV radiation (254 nm). Following this treatment, lipids were extracted from the liposomes and analyzed. The analysis of the lipids before and after UV exposure confirmed a decrease in the signal of DC(8,9)PC of about 90%. In contrast, there was no reduction in DPPC signal.
Collapse
Affiliation(s)
- Simona Colantonio
- Protein Chemistry Laboratory, Advanced Technology Program, SAIC-Frederick/NCI-Frederick, Frederick, MD 21702, USA.
| | | | | | | | | | | | | |
Collapse
|
28
|
Shrivas K, Patel DK. Quantitative determination of nicotinic acid in micro liter volume of urine sample by drop-to-drop solvent microextraction coupled to matrix assisted laser desorption/ionization mass spectrometry. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 78:253-257. [PMID: 21035381 DOI: 10.1016/j.saa.2010.10.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Revised: 09/15/2010] [Accepted: 10/01/2010] [Indexed: 05/30/2023]
Abstract
Drop-to-drop solvent microextraction (DDSME) coupled with matrix assisted laser desorption/ionization mass spectrometry (MALDI-MS) for quantitative determination of nicotinic acid in one drop of urine sample has been proposed. All parameters, such as type of organic solvent, extraction time, exposure volume solvent, pH of the sample solution that affecting the separation and preconcentration of nicotinic acid were investigated. Under the optimal conditions, the detection limit of the method was 20 ng mL(-1) and the relative standard deviations (RSD) for determination of the nicotinic acid were in the range of 8.0-12.5%. The calculated calibration curves gave linearity in the range of 80-1000 ng mL(-1). The main advantages of the proposed method are simple, fast, and small amount of sample solution is used for separation and preconcentration of nicotinic acid. This method could be also useful for the analysis of other interested analytes in small volume of biological samples, like plasma, saliva and urine, where the availability of samples are limited.
Collapse
Affiliation(s)
- Kamlesh Shrivas
- Department of Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan.
| | | |
Collapse
|
29
|
Santos HM, Glez-Peña D, Reboiro-Jato M, Fdez-Riverola F, Diniz MS, Lodeiro C, Capelo-Martínez JL. A novel 18O inverse labeling-based workflow for accurate bottom-up mass spectrometry quantification of proteins separated by gel electrophoresis. Electrophoresis 2010; 31:3407-19. [DOI: 10.1002/elps.201000251] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
30
|
Jeong KH, Seo JC, Yoon HJ, Shin SK. Focused Electrospray Deposition for Matrix-assisted Laser Desorption/Ionization Mass Spectrometry. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.8.2293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
31
|
Hart-Smith G, Barner-Kowollik C. Contemporary Mass Spectrometry and the Analysis of Synthetic Polymers: Trends, Techniques and Untapped Potential. MACROMOL CHEM PHYS 2010. [DOI: 10.1002/macp.201000107] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
32
|
Urso E, Le Pera M, Bossio S, Sprovieri T, Qualtieri A. Quantification of thymosin β4 in human cerebrospinal fluid using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Anal Biochem 2010; 402:13-9. [DOI: 10.1016/j.ab.2010.03.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Revised: 01/27/2010] [Accepted: 03/22/2010] [Indexed: 10/19/2022]
|
33
|
Persike M, Zimmermann M, Klein J, Karas M. Quantitative Determination of Acetylcholine and Choline in Microdialysis Samples by MALDI-TOF MS. Anal Chem 2010; 82:922-9. [DOI: 10.1021/ac902130h] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Markus Persike
- Cluster of Excellence “Macromolecular Complexes”, Institute of Pharmaceutical Chemistry, and Institute of Pharmacology, Goethe University, Frankfurt, Germany
| | - Martina Zimmermann
- Cluster of Excellence “Macromolecular Complexes”, Institute of Pharmaceutical Chemistry, and Institute of Pharmacology, Goethe University, Frankfurt, Germany
| | - Jochen Klein
- Cluster of Excellence “Macromolecular Complexes”, Institute of Pharmaceutical Chemistry, and Institute of Pharmacology, Goethe University, Frankfurt, Germany
| | - Michael Karas
- Cluster of Excellence “Macromolecular Complexes”, Institute of Pharmaceutical Chemistry, and Institute of Pharmacology, Goethe University, Frankfurt, Germany
| |
Collapse
|
34
|
McAlpin CR, Cox CR, Matyi SA, Voorhees KJ. Enhanced matrix-assisted laser desorption/ionization time-of-flight mass spectrometric analysis of bacteriophage major capsid proteins with beta-mercaptoethanol pretreatment. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2010; 24:11-14. [PMID: 19967739 DOI: 10.1002/rcm.4349] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Bacteriophage (phage) proteins have been analyzed previously with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). However, analysis of phage major capsid proteins (MCPs) has been limited by the ability to reproducibly generate ions from MCP monomers. While the acidic conditions of MALDI-TOF MS sample preparation have been shown to aid in disassembly of some phage capsids, many require further treatment to successfully liberate MCP monomers. The findings presented here suggest that beta-mercaptoethanol reduction of the disulfide bonds linking phage MCPs prior to mass spectrometric analysis results in significantly increased MALDI-TOF MS sensitivity and reproducibility of Yersinia pestis-specific phage protein profiles.
Collapse
Affiliation(s)
- Casey R McAlpin
- Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO 80401, USA
| | | | | | | |
Collapse
|
35
|
Persike M, Karas M. Rapid simultaneous quantitative determination of different small pharmaceutical drugs using a conventional matrix-assisted laser desorption/ionization time-of-flight mass spectrometry system. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:3555-3562. [PMID: 19844965 DOI: 10.1002/rcm.4283] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The present study establishes a simple, rapid and sensitive method for the simultaneous quantification of different small pharmaceutical drugs using a matrix-assisted laser desorption/ionization source (MALDI) coupled with a time-of-flight (TOF) mass analyzer. Neither time-consuming sample preparation, nor special target plates, isotopically labelled internal standards or other extra equipment are necessary. A simple standard dried-droplet preparation with the common matrix alpha-cyano-4-hydroxycinnamic acid (CHCA) was used. The background signals of CHCA in the low-mass region did not pose the presumed problem, because the sensitivity, resolution and mass accuracy of a modern MALDI-TOF MS system is sufficient to overcome this difficulty. Four experiments were performed in order to verify the quantification method. First, ten different phenothiazines were quantified in the range of 5-2000 nM (1-880 ng/mL). A good precision (relative standard deviation (RSD) 4.4-9.3%), linearity (R2 >0.99) and accuracy (error 4.7-11%) was obtained in all cases. Additionally, simultaneous quantification of these ten phenothiazines was carried out in human plasma without prior chromatographic separation in the range of 2-1750 ng/mL yielding good linearity, precision and accuracy (mean RSD 7.6%; R2 >0.99, mean error 8.0%). Accordingly, a quantitative analysis of ten chemically and pharmaceutically unrelated drugs was performed in the same way. A comparable linearity (R2 >0.99), precision (mean RSD 7.6%) and accuracy (mean error 8.3%) was obtained in the range of 5-2000 nM. Finally, the prazosin content of a commercial tablet was directly determined without further purification steps.
Collapse
Affiliation(s)
- Markus Persike
- Cluster of Excellence Macromolecular Complexes, Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany.
| | | |
Collapse
|
36
|
Calvano CD, Carulli S, Palmisano F. Aniline/alpha-cyano-4-hydroxycinnamic acid is a highly versatile ionic liquid for matrix-assisted laser desorption/ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:1659-68. [PMID: 19412917 DOI: 10.1002/rcm.4053] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The performance of a matrix-assisted laser desorption/ionization (MALDI) ionic liquid matrix (ILM) consisting of alpha-cyano-4-hydroxycinnamic acid (CHCA) and aniline (ANI) was evaluated to assess whether it could offer possible advantages over conventional matrices. Ultraviolet (UV), Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR) and laser desorption/ionization mass spectrometry (LDI-MS) experiments were carried out with the aim of confirming the structure of the ANI-CHCA ILM. Different model analytes such as amino acids, peptides, proteins, lipids, phospholipids, synthetic polymers, and sugars were tested. Mass spectra with similar or improved signal-to-noise (S/N) ratio (compared to CHCA) were invariably obtained demonstrating the potential of this ILM as a general purpose matrix. Furthermore, protein identification by peptide mass fingerprinting (PMF) and database search was facilitated compared to CHCA since higher scores and increased sequence coverage were observed. Finally, a complex lipid mixture (i.e. a raw extract of a milk sample) analysed by MALDI-MS showed improved S/N ratio, a reduced chemical noise and a limited formation of matrix-clusters.
Collapse
Affiliation(s)
- Cosima D Calvano
- Dipartimento di Chimica - Università degli Studi di Bari, Via Orabona 4, 70126 Bari, Italy
| | | | | |
Collapse
|
37
|
Hart-Smith G, Lammens M, Du Prez FE, Guilhaus M, Barner-Kowollik C. ATRP poly(acrylate) star formation: A comparative study between MALDI and ESI mass spectrometry. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.03.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
38
|
Duncan MW, Roder H, Hunsucker SW. Quantitative matrix-assisted laser desorption/ionization mass spectrometry. BRIEFINGS IN FUNCTIONAL GENOMICS AND PROTEOMICS 2009; 7:355-70. [PMID: 19106161 DOI: 10.1093/bfgp/eln041] [Citation(s) in RCA: 161] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This review summarizes the essential characteristics of matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometry (TOF MS), especially as they relate to its applications in quantitative analysis. Approaches to quantification by MALDI-TOF MS are presented and published applications are critically reviewed.
Collapse
Affiliation(s)
- Mark W Duncan
- Division of Endocrinology, Metabolism and Diabetes, School of Medicine, University of Colorado Denver, Mail Stop 8106, 12801 East 17th Avenue, Aurora, CO 80045, USA.
| | | | | |
Collapse
|
39
|
Szaéjli E, Feheér T, Medzihradszky KF. Investigating the Quantitative Nature of MALDI-TOF MS. Mol Cell Proteomics 2008; 7:2410-8. [DOI: 10.1074/mcp.m800108-mcp200] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
|
40
|
Saska I, Colgrave ML, Jones A, Anderson MA, Craik DJ. Quantitative analysis of backbone-cyclised peptides in plants. J Chromatogr B Analyt Technol Biomed Life Sci 2008; 872:107-14. [PMID: 18701356 DOI: 10.1016/j.jchromb.2008.07.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Revised: 07/08/2008] [Accepted: 07/17/2008] [Indexed: 01/23/2023]
Abstract
Progress in understanding the biosynthetic pathway of the cyclotides has been hampered as this unique family of cyclic plant peptides are notoriously difficult to analyse by standard proteomic approaches such as gel electrophoresis. We have developed a simple, rapid and robust strategy for the quantification of cyclotides in crude plant extracts using MALDI-TOF MS making use of generic peptides similar in mass to the analyte as internal standards for calibration. Linearity (r(2)>0.99) over two orders of magnitude (down to femtomole levels) was achieved in plant extracts, allowing quantitative analysis of transgenic and endogenous peptide expression.
Collapse
Affiliation(s)
- Ivana Saska
- Institute for Molecular Bioscience, University of Queensland, 306 Carmody Road, Brisbane, Queensland 4072, Australia
| | | | | | | | | |
Collapse
|
41
|
Garaguso I, Borlak J. Matrix layer sample preparation: An improved MALDI-MS peptide analysis method for proteomic studies. Proteomics 2008; 8:2583-95. [PMID: 18546159 DOI: 10.1002/pmic.200701147] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ignazio Garaguso
- Department of Drug Research and Medical Biotechnology, Fraunhofer Institute of Toxicology and Experimental Medicine, Hannover, Germany
| | | |
Collapse
|
42
|
Soltwisch J, Berkenkamp S, Dreisewerd K. A binary matrix of 2,5-dihydroxybenzoic acid and glycerol produces homogenous sample preparations for matrix-assisted laser desorption/ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2008; 22:59-66. [PMID: 18050244 DOI: 10.1002/rcm.3332] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We introduce a two-component matrix for ultraviolet matrix-assisted laser desorption/ionization mass spectrometry (UV-MALDI-MS) that consists of 2,5-dihydroxybenzoic acid (DHB) and glycerol. Upon slow evaporation of residual water/methanol solvents in a pre-vacuum chamber sample preparations are obtained that exhibit a homogeneous morphology with analyte-matrix crystals evenly distributed over the whole sample spot. At a molar DHB/glycerol ratio of approximately 1:5, the crystals range in length from approximately 100 to 300 microm and are about 15-30 microm wide. Mass spectra of peptides, proteins, and an oligosaccharide are presented and compared with those recorded from standard dried-droplet DHB matrix. The ion signals show a reproducibility of the order of 10-15% when scanning the surface of an individual sample or even different samples that contain the same amount of peptide, A close to linear relationship between peptide concentration and the corresponding peptide ion signal is found over three orders of magnitude of sample prepared. However, when a fixed position is irradiated with a large number of laser pulses, a monotonous decay of peptide ion signal with time is observed. Potentially, the binary matrix will be especially useful for the analysis of samples that are stabilized in buffered aqueous glycerol solution and preliminary results addressing this aspect are shown.
Collapse
Affiliation(s)
- Jens Soltwisch
- Institute of Medical Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Germany
| | | | | |
Collapse
|
43
|
Atsriku C, Benz CC, Scott GK, Gibson BW, Baldwin MA. Quantification of cysteine oxidation in human estrogen receptor by mass spectrometry. Anal Chem 2007; 79:3083-90. [PMID: 17373775 PMCID: PMC2536661 DOI: 10.1021/ac062154o] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Redox-dependent modifications of sulfhydryl groups within the two Cys4 zinc fingers of the estrogen receptor DNA-binding domain (ER-DBD) result in structural damage and loss of ER DNA-binding function, which parallels the situation observed in many ER-positive breast cancers. Quantitation of the redox status of cysteinyl thiols within ER-DBD employed cysteine-specific oxidants to induce varying degrees of oxidation in recombinant ER, followed by differential alkylation with the stable isotopic labeling reagents [12C2]-iodoacetic acid and [13C2]-bromoacetic acid. Subsequent proteolysis with LysC/Asp-N generated diagnostic peptides of which the C-terminal peptide of the second zinc finger is most strongly detected by mass spectrometry (MS) and serves as a suitable marker of ER-DBD redox status. Data were collected from two different MALDI-MS instruments: a time-of-flight and a linear ion trap (vMALDI-LIT). An analogous but larger synthetic peptide treated with three isotopic variants of the alkylating reagent modeled isotopic overlaps that might complicate the relative quantitation of cysteine oxidation. Despite the isotopic overlaps, excellent relative quantitation was achieved from MS data obtained from both instruments. This was also true of tandem MS/MS data from the vMALDI-LIT, which should facilitate selected reaction monitoring. Relative quantitation by MS also closely matched data from immunochemical methods.
Collapse
|
44
|
Characterization of aliphatic hyperbranched polyesters by MALDI-TOF mass spectrometry. HEMIJSKA INDUSTRIJA 2007. [DOI: 10.2298/hemind0706333v] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In this work, MALDI-TOF mass spectrometry was used for the characterization of aliphatic hyperbranched polyesters (AHBP), synthesized from 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) and di-trimethylolpropane. From the obtained results it was concluded that it was not possible to take complete advantages of MALDI-TOF MS in this particular case, since the AHBP used in this work were polydisperse. The intensity of the signals from the high mass tail of these samples (pseudo generation higher than four) was underestimated and insufficient to distinguish it from the baseline and to use it for the analysis of the spectra. As a consequence of that, lower values of the Mn were obtained. At the same time, Mw were also underestimated, which led to very low values of the polydispersity index. On the other hand, it was possible to obtain molar masses of individual molecules from the MALDI-TOF mass spectra of AHBP and to qualitatively determine the extent of cyclization (side reactions) at each degree of polymerization. Using the adequate set of equations and results obtained from MALDI-TOF mass spectra of AHBP, every signal from the spectra was identified. The obtained results show that formation of poly(bis-MPA), intramolecular esterification and intramolecular etherification occurred as side reactions during the synthesis of these polyesters. The relative amount of the cycles increases with the number of pseudo generation (from the second up to the fifth pseudo generation). It was also observed that the relative proportion of the signals which represent cyclic structures increases with the increasing degree of polymerization. In this work the basic principles of MALDI-TOF MS are also presented, as well as, a review of adequate published articles.
Collapse
|
45
|
John H, Hierer J, Haas O, Forssmann WG. Quantification of angiotensin-converting-enzyme-mediated degradation of human chemerin 145-154 in plasma by matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry. Anal Biochem 2006; 362:117-25. [PMID: 17240345 DOI: 10.1016/j.ab.2006.12.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2006] [Revised: 11/27/2006] [Accepted: 12/04/2006] [Indexed: 12/26/2022]
Abstract
Chemerin is a chemoattractive protein acting as a ligand for the G-protein-coupled receptor ChemR23/CMKLR1 and plays an important role in the innate and adaptive immunity. Proteolytic processing of its C terminus is essential for receptor binding and physiological activity. Therefore, we investigated the plasma stability of the decapeptide chemerin 145-154 (P(145)-F(154)) corresponding to the C terminus of the physiologically active chemerin variant E(21)-F(154) from human hemofiltrate. For monitoring concentration-time profiles and degradation products we developed a novel matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry procedure using an internal peptide standard (hemorphin LVV-H7) for quantification. The linear range covers 2.5 orders of magnitude in the lower micromolar concentration range (lower limit of quantification 0.312 microg/ml, 0.25 microM) characterized by satisfactory reproducibility (CV < or =9%), accuracy (< or =10%), ruggedness, and recovery (98%). We found that chemerin 145-154 is C-terminally truncated in human citrate plasma by the cleavage of the penultimate dipeptidyl residue. N-terminal truncation was not observed. In contrast to citrate plasma, no degradation was detected in ethylenediammetetraacetate (EDTA) plasma. We identified angiotensin-converting-enzyme (ACE) to be responsible for C-terminal truncation, which could be completely inhibited by EDTA and captopril. These results are relevant to clarify the natural processing of chemerin and the potential involvement of ACE in mediating the immune response.
Collapse
Affiliation(s)
- Harald John
- IPF PharmaCeuticals GmbH, Feodor-Lynen-Str. 31, D-30625 Hannover, Germany.
| | | | | | | |
Collapse
|
46
|
Tholey A, Heinzle E. Ionic (liquid) matrices for matrix-assisted laser desorption/ionization mass spectrometry-applications and perspectives. Anal Bioanal Chem 2006; 386:24-37. [PMID: 16830111 DOI: 10.1007/s00216-006-0600-5] [Citation(s) in RCA: 233] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2006] [Revised: 06/06/2006] [Accepted: 06/07/2006] [Indexed: 11/30/2022]
Abstract
A large number of matrix substances have been used for various applications in matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS). The majority of matrices applied in ultraviolet-MALDI MS are crystalline, low molecular weight compounds. A problem encountered with many of these matrices is the formation of hot spots, which lead to inhomogeneous samples, thus leading to increased measurement times and hampering the application of MALDI MS for quantitative purposes. Recently, ionic (liquid) matrices (ILM or IM) have been introduced as a potential alternative to the classical crystalline matrices. ILM are equimolar mixtures of conventional MALDI matrix compounds such as 2,5-dihydroxybenzoic acid (DHB), alpha-cyano-4-hydroxycinnamic acid (CCA) or sinapinic acid (SA) together with organic bases [e.g., pyridine (Py), tributylamine (TBA) or N,N-dimethylethylenediamine (DMED)]. The present article presents a first overview of this new class of matrices. Characteristic properties of ILM, their influence on mass spectrometric parameters such as sensitivity, resolution and adduct formation and their application in the fields of proteome analysis, the measurement of low molecular weight compounds, the use of MALDI MS for quantitative purposes and in MALDI imaging will be presented. Scopes and limitations for the application of ILM are discussed.
Collapse
Affiliation(s)
- Andreas Tholey
- Technische Biochemie, Geb. 1.5, Universität des Saarlandes, 66123 Saarbrücken, Germany.
| | | |
Collapse
|
47
|
Huang YF, Chang HT. Nile Red-Adsorbed Gold Nanoparticle Matrixes for Determining Aminothiols through Surface-Assisted Laser Desorption/Ionization Mass Spectrometry. Anal Chem 2006; 78:1485-93. [PMID: 16503598 DOI: 10.1021/ac0517646] [Citation(s) in RCA: 200] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper describes the use of Nile Red-adsorbed gold nanoparticles (NRAuNPs) as selective probes and matrixes for the determination of aminothiols through surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS). The binding of three aminothiols-glutathione (GSH), cysteine (Cys), and homocysteine (HCys)-to the surfaces of these NRAuNPs induces their aggregation, which causes asubsequent changes in their color and fluorescence. Because arginine-a non-thiol amino acid-does not induce such aggregation, it is a straightforward process to use the NRAuNPs to selectively concentrate the aminothiols from a solution containing all four of these analytes; we were able to identify the three aminothiols in the precipitate, and arginine in the supernatant, directly through SALDI-MS measurements. Without using this preconcentration approach, the limits of detection (LODs) at a signal-to-noise ratio of 3 were 1.0, 2.0, and 1.3 microM for GSH, Cys, and HCys, respectively. In comparison, selective concentration using the NRAuNPs provided LODs of 25, 54, and 34 nM, for the determinations of GSH, Cys, and HCys, respectively. NRAuNP matrixes provide a number of advantages over the use of conventional organic matrixes (e.g., 2,5-dihydroxybenzoic acid), such as ease of preparation, selectivity, sensitivity, and repeatability. We validated the applicability of our method through the analyses of GSH in red blood cells and of Cys in plasma; we believe that this approach has great potential for diagnosis.
Collapse
Affiliation(s)
- Yu-Fen Huang
- Department of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei, Taiwan
| | | |
Collapse
|
48
|
Xie JP, Sun SH, Wang HY, Zong YL, Nie C, Guo YL. Determination of nicotine in mainstream smoke on the single puff level by liquid-phase microextraction coupled to matrix-assisted laser desorption/ionization Fourier transform mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2006; 20:2573-8. [PMID: 16878339 DOI: 10.1002/rcm.2636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A method coupling liquid-phase microextraction with matrix-assisted laser desorption/ionization Fourier transform mass spectrometry (LPME/MALDI-FTMS) was developed to measure the content of nicotine in mainstream smoke at the single puff level. Glycerol was utilized as a matrix additive in the sample preparation to improve the homogeneity of analyte distribution in a sample spot. Good repeatability of the MALDI-MS signal (RSD <9%) was achieved by the method. Selective LPME facilitated the separation and purification of basic components from cigarette smoke. The LPME device was coupled to a smoking machine, and each puff of one cigarette could be gathered by this modified machine. The amount of nicotine in the mainstream smoke was measured at the single puff level by LPME/MALDI-FTMS. The method was simple and selective and was sufficiently sensitive to detect nicotine in each puff of one cigarette. The method thus offered an alternative approach to the study of the formation mechanism of cigarette smoke constituents.
Collapse
Affiliation(s)
- Jian-Ping Xie
- Zhongzhou Tobacco Research Institute, Chinese National Tobacco Corporation, Zhengzhou 450001, China
| | | | | | | | | | | |
Collapse
|
49
|
Sleno L, Volmer DA. Assessing the properties of internal standards for quantitative matrix-assisted laser desorption/ionization mass spectrometry of small molecules. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2006; 20:1517-24. [PMID: 16628567 DOI: 10.1002/rcm.2498] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Growing interest in the ability to conduct quantitative assays for small molecules by matrix-assisted laser desorption/ionization (MALDI) has been the driving force for several recent studies. This present work includes the investigation of internal standards for these analyses using a high-repetition rate MALDI triple quadrupole instrument. Certain physicochemical properties are assessed for predicting possible matches for internal standards for different small molecules. The importance of similar molecular weight of an internal standard to its analyte is seen through experiments with a series of acylcarnitines, having a fixed charge site and growing alkyl chain length. Both acetyl- and hexanoyl-carnitine were systematically assessed with several other acylcarnitine compounds as internal standards. The results clearly demonstrate that closely matched molecular weights between analyte and internal standard are essential for acceptable quantitation results. Using alpha-cyano-4-hydroxycinnamic acid as the organic matrix, the similarities between analyte and internal standard remain the most important parameter and not necessarily their even distribution within the solid sample spot. Several 4-quinolone antibiotics as well as a diverse group of pharmaceutical drugs were tested as internal standards for the 4-quinolone, ciprofloxacin. Quantitative results were shown using the solution-phase properties, log D and pKa, of these molecules. Their distribution coefficients, log D, are demonstrated as a fundamental parameter for similar crystallization patterns of analyte and internal standard. In the end, it was also possible to quantify ciprofloxacin using a drug from a different compound class, namely quinidine, having a similar log D value as the analyte.
Collapse
Affiliation(s)
- Lekha Sleno
- Institute for Marine Biosciences, 1411 Oxford Street, Halifax, Nova Scotia, Canada B3H 3Z1
| | | |
Collapse
|
50
|
Qualitative and quantitative analysis of quaternary ammonium alkaloids from Rhizoma Corydalis by matrix-assisted laser desorption/ionization Fourier transform mass spectrometry coupled with a selective precipitation reaction using Reinecke salt. Anal Chim Acta 2006. [DOI: 10.1016/j.aca.2005.09.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|