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Warren CG, Dasgupta PK. Liquid phase detection in the miniature scale. Microfluidic and capillary scale measurement and separation systems. A tutorial review. Anal Chim Acta 2024; 1305:342507. [PMID: 38677834 DOI: 10.1016/j.aca.2024.342507] [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: 01/08/2024] [Revised: 03/18/2024] [Accepted: 03/19/2024] [Indexed: 04/29/2024]
Abstract
Microfluidic and capillary devices are increasingly being used in analytical applications while their overall size keeps decreasing. Detection sensitivity for these microdevices gains more importance as device sizes and consequently, sample volumes, decrease. This paper reviews optical, electrochemical, electrical, and mass spectrometric detection methods that are applicable to capillary scale and microfluidic devices, with brief introduction to the principles in each case. Much of this is considered in the context of separations. We do consider theoretical aspects of separations by open tubular liquid chromatography, arguably the most potentially fertile area of separations that has been left fallow largely because of lack of scale-appropriate detection methods. We also examine the theoretical basis of zone electrophoretic separations. Optical detection methods discussed include UV/Vis absorbance, fluorescence, chemiluminescence and refractometry. Amperometry is essentially the only electrochemical detection method used in microsystems. Suppressed conductance and especially contactless conductivity (admittance) detection are in wide use for the detection of ionic analytes. Microfluidic devices, integrated to various mass spectrometers, including ESI-MS, APCI-MS, and MALDI-MS are discussed. We consider the advantages and disadvantages of each detection method and compare the best reported limits of detection in as uniform a format as the available information allows. While this review pays more attention to recent developments, our primary focus has been on the novelty and ingenuity of the approach, regardless of when it was first proposed, as long as it can be potentially relevant to miniature platforms.
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Affiliation(s)
- Cable G Warren
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX, 76019-0065, United States
| | - Purnendu K Dasgupta
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX, 76019-0065, United States.
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ZHANG A, ZHANG J. [Advances in enrichment and separation of cis-diol-containing compounds by porous organic frameworks]. Se Pu 2022; 40:966-978. [PMID: 36351805 PMCID: PMC9654963 DOI: 10.3724/sp.j.1123.2022.04024] [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: 05/04/2022] [Indexed: 12/05/2022] Open
Abstract
The design and synthesis of boronate affinity materials that show high efficiency, high selectivity, and high enrichment performance have gained significant attention. The principle of boronate affinity relies on the reversible covalent reactions, including the formation of stable five-membered or six-membered cyclic esters with cis-diol-containing compounds in alkaline aqueous media and dissociation of cyclic esters in an acidic surrounding to release cis-diol-containing compounds. Recently, various boronate affinity materials have been synthesized and utilized for selective enrichment of these compounds. Metal organic frameworks (MOFs) and covalent organic frameworks (COFs) have been widely used in chromatographic separation and sample pretreatment because of their adjustable pore size, high porosity, high specific surface area, tunable skeleton structure, and favorable chemical and thermal stability. To promote the enrichment selectivity of MOFs and COFs for cis-diol-containing compounds, boronic acid-functionalized MOFs and COFs with various structures and categories have been synthesized. This review summarizes more than 80 investigations into the categories, synthetic strategies, and applications of boronic acid-functionalized MOFs and COFs from the Science Citation Index. These synthesis methods include metal ligand-fragment co-assembly, post-synthetic modification, and bottom-up modification of boronic acid-functionalized porous materials. Although two modification strategies (post-synthetic and metal ligand-fragment co-assembly) have been introduced for the preparation of boronic acid-functionalized MOFs, the latter is more commonly adopted as it improves the enrichment selectivity and enrichment efficiency of MOFs. The common limitations of MOFs such as aggregation and aperture issues were also resolved. Boron affinity MOFs possessing favorable properties according to the characteristics of cis-diol-containing compounds, have also been synthesized. Furthermore, to facilitate enrichment and separation, many boronic acid-functionalized magnetic material MOFs have been developed for the enrichment and analysis of cis-diol-containing compounds. Additionally, the luminescent properties of Ln-MOFs have been used in combination with boronic acid affinity for the enrichment, separation, and subsequent detection of cis-diol-containing compounds. Post-synthetic modification and the bottom-up strategy are the primary methods for the preparation of boronic acid-functionalized COFs. Boronic acid-functionalized COFs are less investigated than boronic acid-functionalized MOFs, likely due to the greater complexity of COF synthesis. This work aims to summarize the research advances, synthesis ideas, and synthesis methods related to boric acid-functionalized porous organic frameworks, which will provide theoretical guidance and technical support for its applications while accelerating the commercialization of such organic frameworks.
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Li D, Yi J, Han G, Qiao L. MALDI-TOF Mass Spectrometry in Clinical Analysis and Research. ACS MEASUREMENT SCIENCE AU 2022; 2:385-404. [PMID: 36785658 PMCID: PMC9885950 DOI: 10.1021/acsmeasuresciau.2c00019] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 07/15/2022] [Accepted: 07/15/2022] [Indexed: 05/04/2023]
Abstract
In the decade after being awarded the Nobel Prize in Chemistry in 2002, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been widely used as an analytical chemistry tool for the detection of large and small molecules (e.g., polymers, proteins, peptides, nucleic acids, amino acids, lipids, etc.) and for clinical analysis and research (e.g., pathogen identification, genetic disorders screening, cancer diagnosis, etc.). In view of the fast development of MALDI-TOF MS in clinical usage, this review systematically summarizes the most important applications of MALDI-TOF MS in clinical analysis and research by analyzing MALDI TOF MS-related reviews collected in the Web of Science database. On the basis of the analysis of keyword co-occurrence of over 2000 review articles, four themes consisting of "pathogen identification", "disease diagnosis", "nucleic acids analysis", and "small molecules analysis" were found. For each theme, the review further outlined their application implications, analytical methods, and systems as well as limitations that need to be addressed. Overall, the review summarizes and elaborates on the clinical applications of MALDI-TOF MS, providing a comprehensive picture for researchers embarking on MALDI TOF MS-related clinical analysis and research.
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Yang J, Wang C, Luo L, Li Z, Xu B, Guo L, Xie J. Highly sensitive MALDI-MS measurement of active ricin: insight from more potential deoxynucleobase-hybrid oligonucleotide substrates. Analyst 2021; 146:2955-2964. [PMID: 33949380 DOI: 10.1039/d0an02205e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Herein, we report an improved MALDI-MS method for active ricin to contribute toward countermeasures against its real threat to the public. Compared with commonly used DNA or RNA substrates, the deoxynucleobase-hybrid oligonucleotide (RNA_dA, Rd) substrate containing functional Gd[combining low line]A[combining low line]GA loop was revealed as a substrate with more potential and used for the first time in ricin measurement via MALDI-MS. The Rd sequence greatly prompted ricin to exhibit its catalytic activity as rRNA N-glycosylase in ex vitro condition, which was supported by molecular docking simulation and enzymatic parameters depicted in MALDI-MS. Furthermore, we discovered that a highly pure matrix was the most crucial parameter for enhancing the sensitivity, which addressed the major obstacle encountered in the oligo(deoxy)nucleotide measurement, i.e., the interfering alkali metal ion-adducted signals in MALDI-MS. After the optimization of pH and enzymatic reaction buffer composition in this ex vitro condition, this method can provide a wide linearity of up to three orders of magnitude, i.e., 1-5000 ng mL-1, and a high sensitivity of 1 ng mL-1 without any enrichment. Denatured and active ricin could be distinctly differentiated, and the application to practical samples from one international exercise and a soft drink proved the feasibility of this new method. We believe this MALDI-MS method can contribute to the first response to ricin occurrence events in public safety and security, as well as pave a new way for a deep understanding of ricin and other type II ribosome inactivating proteins involved toxicology.
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Affiliation(s)
- Jiewei Yang
- State Key Laboratory of Toxicology and Medical Countermeasures, and Laboratory of Toxicant Analysis, Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China.
| | - Chenyu Wang
- State Key Laboratory of Toxicology and Medical Countermeasures, and Laboratory of Toxicant Analysis, Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China. and School of Pharmacy, Minzu University, Beijing, 100081, China
| | - Li Luo
- State Key Laboratory of Toxicology and Medical Countermeasures, and Laboratory of Toxicant Analysis, Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China. and School of Public Health, Hebei Medical University, Shijiazhuang, Hebei Province 050017, China
| | - Zhi Li
- State Key Laboratory of Toxicology and Medical Countermeasures, and Laboratory of Toxicant Analysis, Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China.
| | - Bin Xu
- State Key Laboratory of Toxicology and Medical Countermeasures, and Laboratory of Toxicant Analysis, Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China.
| | - Lei Guo
- State Key Laboratory of Toxicology and Medical Countermeasures, and Laboratory of Toxicant Analysis, Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China.
| | - Jianwei Xie
- State Key Laboratory of Toxicology and Medical Countermeasures, and Laboratory of Toxicant Analysis, Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing, 100850, China.
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Fresnais M, Yildirim E, Karabulut S, Jäger D, Zörnig I, Benzel J, Pajtler KW, Pfister SM, Burhenne J, Haefeli WE, Longuespée R. Rapid MALDI-MS Assays for Drug Quantification in Biological Matrices: Lessons Learned, New Developments, and Future Perspectives. Molecules 2021; 26:molecules26051281. [PMID: 33652935 PMCID: PMC7956427 DOI: 10.3390/molecules26051281] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 02/22/2021] [Accepted: 02/23/2021] [Indexed: 12/11/2022] Open
Abstract
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) has rarely been used in the field of therapeutic drug monitoring, partly because of the complexity of the ionization processes between the compounds to be quantified and the many MALDI matrices available. The development of a viable MALDI-MS method that meets regulatory guidelines for bioanalytical method validation requires prior knowledge of the suitability of (i) the MALDI matrix with the analyte class and properties for ionization, (ii) the crystallization properties of the MALDI matrix with automation features, and (iii) the MS instrumentation used to achieve sensitive and specific measurements in order to determine low pharmacological drug concentrations in biological matrices. In the present hybrid article/white paper, we review the developments required for the establishment of MALDI-MS assays for the quantification of drugs in tissues and plasma, illustrated with concrete results for the different steps. We summarize the necessary parameters that need to be controlled for the successful development of fully validated MALDI-MS methods according to regulatory authorities, as well as currently unsolved problems and promising ways to address them. Finally, we propose an expert opinion on future perspectives and needs in order to establish MALDI-MS as a universal method for therapeutic drug monitoring.
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Affiliation(s)
- Margaux Fresnais
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany; (M.F.); (E.Y.); (S.K.); (J.B.); (W.E.H.)
| | - Esra Yildirim
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany; (M.F.); (E.Y.); (S.K.); (J.B.); (W.E.H.)
| | - Seda Karabulut
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany; (M.F.); (E.Y.); (S.K.); (J.B.); (W.E.H.)
| | - Dirk Jäger
- National Center for Tumor Diseases Heidelberg, Department of Medical Oncology, Heidelberg University Hospital, Im Neuenheimer Feld 460, 69120 Heidelberg, Germany; (D.J.); (I.Z.)
| | - Inka Zörnig
- National Center for Tumor Diseases Heidelberg, Department of Medical Oncology, Heidelberg University Hospital, Im Neuenheimer Feld 460, 69120 Heidelberg, Germany; (D.J.); (I.Z.)
| | - Julia Benzel
- Hopp Children’s Cancer Center Heidelberg (KiTZ), Im Neuenheimer Feld 430, 69120 Heidelberg, Germany; (J.B.); (K.W.P.); (S.M.P.)
- German Cancer Research Center (DKFZ), Division of Pediatric Neurooncology, German Cancer Consortium (DKTK), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Kristian W. Pajtler
- Hopp Children’s Cancer Center Heidelberg (KiTZ), Im Neuenheimer Feld 430, 69120 Heidelberg, Germany; (J.B.); (K.W.P.); (S.M.P.)
- German Cancer Research Center (DKFZ), Division of Pediatric Neurooncology, German Cancer Consortium (DKTK), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Department of Pediatric Hematology, Oncology and Immunology, Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - Stefan M. Pfister
- Hopp Children’s Cancer Center Heidelberg (KiTZ), Im Neuenheimer Feld 430, 69120 Heidelberg, Germany; (J.B.); (K.W.P.); (S.M.P.)
- German Cancer Research Center (DKFZ), Division of Pediatric Neurooncology, German Cancer Consortium (DKTK), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Department of Pediatric Hematology, Oncology and Immunology, Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - Jürgen Burhenne
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany; (M.F.); (E.Y.); (S.K.); (J.B.); (W.E.H.)
| | - Walter E. Haefeli
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany; (M.F.); (E.Y.); (S.K.); (J.B.); (W.E.H.)
| | - Rémi Longuespée
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany; (M.F.); (E.Y.); (S.K.); (J.B.); (W.E.H.)
- Correspondence:
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Fernández-Vega A, Chicano-Gálvez E, Prentice BM, Anderson D, Priego-Capote F, López-Bascón MA, Calderón-Santiago M, Avendaño MS, Guzmán-Ruiz R, Tena-Sempere M, Fernández JA, Caprioli RM, Malagón MM. Optimization of a MALDI-Imaging protocol for studying adipose tissue-associated disorders. Talanta 2020; 219:121184. [PMID: 32887102 DOI: 10.1016/j.talanta.2020.121184] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 05/13/2020] [Accepted: 05/15/2020] [Indexed: 12/13/2022]
Abstract
Matrix-assisted laser desorption ionization (MALDI) imaging mass spectrometry (IMS) is increasingly recognized for its potential in the discovery of novel biomarkers directly from tissue sections. However, there are no MALDI IMS studies as yet on the adipose tissue, a lipid-enriched tissue that plays a pivotal role in the development of obesity-associated disorders. Herein, we aimed at developing an optimized method for analyzing adipose tissue lipid composition under both physiological and pathological conditions by MALDI IMS. Our studies showed an exacerbated lipid delocalization from adipose tissue sections when conventional strategies were applied. However, our optimized method using conductive-tape sampling and 2,5-dihydroxybenzoic acid (DHB) as a matrix, preserved the anatomical organization and minimized lipid diffusion from sample sections. This method enabled the identification of a total of 625 down-regulated and 328 up-regulated m/z values in the adipose tissue from a rat model of extreme obesity as compared to lean animals. Combination of MALDI IMS and liquid chromatography (LC)-MS/MS data identified 44 differentially expressed lipid species between lean and obese animals, including phospholipids and sphingomyelins. Among the lipids identified, SM(d18:0_18:2), PE(P-16:0_20:0), and PC(O-16:0_16:1) showed a differential spatial distribution in the adipose tissue of lean vs. obese animals. In sum, our method provides a valuable new tool for research on adipose tissue that may pave the way for the identification of novel biomarkers of obesity and metabolic disease.
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Affiliation(s)
- A Fernández-Vega
- Dept. Cell Biology, Physiology, and Immunology, IMIBIC/University of Cordoba (UCO)/Reina Sofia University Hospital (HURS), Cordoba, Spain; CIBER Physiopathology of Obesity and Nutrition (CIBERobn), ISCIII, Spain
| | | | - B M Prentice
- Department of Chemistry, University of Florida, Gainesville, FL, USA
| | - D Anderson
- Mass Spectrometry Research Center, Vanderbilt University, Nashville, TN, 37232, USA; Department of Biochemistry, Vanderbilt University, Nashville, TN, 37232, USA
| | - F Priego-Capote
- Department of Analytical Chemistry, IMIBIC/UCO/HURS, Cordoba, Spain
| | - M A López-Bascón
- Department of Analytical Chemistry, IMIBIC/UCO/HURS, Cordoba, Spain
| | | | - M S Avendaño
- Dept. Cell Biology, Physiology, and Immunology, IMIBIC/University of Cordoba (UCO)/Reina Sofia University Hospital (HURS), Cordoba, Spain; CIBER Physiopathology of Obesity and Nutrition (CIBERobn), ISCIII, Spain
| | - R Guzmán-Ruiz
- Dept. Cell Biology, Physiology, and Immunology, IMIBIC/University of Cordoba (UCO)/Reina Sofia University Hospital (HURS), Cordoba, Spain; CIBER Physiopathology of Obesity and Nutrition (CIBERobn), ISCIII, Spain
| | - M Tena-Sempere
- Dept. Cell Biology, Physiology, and Immunology, IMIBIC/University of Cordoba (UCO)/Reina Sofia University Hospital (HURS), Cordoba, Spain; CIBER Physiopathology of Obesity and Nutrition (CIBERobn), ISCIII, Spain
| | - J A Fernández
- Department of Physical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940, Leioa, Spain
| | - R M Caprioli
- Mass Spectrometry Research Center, Vanderbilt University, Nashville, TN, 37232, USA; Department of Biochemistry, Vanderbilt University, Nashville, TN, 37232, USA; Department of Physical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940, Leioa, Spain; Department of Chemistry, Vanderbilt University, Nashville, TN, 37232, USA; Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, 37232, USA; Department of Pharmacology, Vanderbilt University, Nashville, TN, 37232, USA; Department of Medicine, Vanderbilt University, Nashville, TN, 37232, USA
| | - M M Malagón
- Dept. Cell Biology, Physiology, and Immunology, IMIBIC/University of Cordoba (UCO)/Reina Sofia University Hospital (HURS), Cordoba, Spain; CIBER Physiopathology of Obesity and Nutrition (CIBERobn), ISCIII, Spain.
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Huang H, Sun L, He H, Xia T. A New Silicon Dioxide-Coated MALDI-ToF Sample Plate for Peptide Analysis. BIOMED RESEARCH INTERNATIONAL 2020; 2020:8597217. [PMID: 32685536 PMCID: PMC7345610 DOI: 10.1155/2020/8597217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 06/01/2020] [Indexed: 11/17/2022]
Abstract
In this report, we describe the development and testing of a new coated plate which improves the sensitivity and accuracy in matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-ToF-MS). The coated plate was covered with a thin layer of hydrophobic silicon dioxide, which enabled sample enrichment due to the water repellent nature of the silicon dioxide surface. Sensitivity and required laser strengths were tested using peptide standards, with the results that these coated plates required lower laser power and showed increased sensitivity than that of common plates. Accuracy was tested using bacteria, saliva, and serum samples. The coated plates showed significantly increased degrees of accuracy through their capacity to reduce mass shift. The importance and necessity of accuracy analysis in the assessment of new sample plates, which is rarely described in other papers, is also discussed.
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Affiliation(s)
- He Huang
- Department of Critical Care Medicine, The 960th Hospital of PLA Joint Logistics Support Force, No. 25 Shifan Road, Tianqiao District, Jinan, Shandong 250031, China
| | - Lei Sun
- Department of Stomatology, 306 Hospital of PLA, No. 9 Anxiang Beili Road, Chaoyang District, Beijing 100101, China
| | - Haiyang He
- Department of Dermatology, 306 Hospital of PLA, No. 9 Anxiang Beili Road, Chaoyang District, Beijing 100101, China
| | - Tianbao Xia
- Department of Dermatology, 306 Hospital of PLA, No. 9 Anxiang Beili Road, Chaoyang District, Beijing 100101, China
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Tucker B, Hermann M, Mainguy A, Oleschuk R. Hydrophobic/hydrophilic patterned surfaces for directed evaporative preconcentration. Analyst 2020; 145:643-650. [DOI: 10.1039/c9an01782h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We present a microfluidic platform that rapidly deposits many samples and preconcentrates them, making it suitable for a wide range of high-throughput detection schemes.
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Affiliation(s)
- Ben Tucker
- Department of Chemistry
- Queen's University
- Kingston
- Canada
| | | | - Alexa Mainguy
- Department of Chemistry
- Queen's University
- Kingston
- Canada
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Hu K, Lv Y, Ye F, Chen T, Zhao S. Boric-Acid-Functionalized Covalent Organic Framework for Specific Enrichment and Direct Detection of cis-Diol-Containing Compounds by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry. Anal Chem 2019; 91:6353-6362. [PMID: 30999744 DOI: 10.1021/acs.analchem.9b01376] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Design and synthesis of a novel matrix that serves as highly selective adsorption material are significant for the matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis of small molecules in complicated biosamples. In this work, we presented a facile one-pot strategy for the synthesis of boric-acid-functionalized covalent organic frameworks (B-COFs) by using 2,4,6-trihydroxy-1,3,5-benzenetrialdehyde, benzidine, and 4-aminophenyl-boronic acid as ligands. Compared with bare COFs, the B-COFs have similar crystallinity, specific surface, and well-developed pore structure. The surface area and average pore size of B-COFs were 238.0 m2/g and 1.2 nm, respectively. The resulting material was used as an adsorbent for selective enrichment of cis-diol-containing compounds based on an affinity reaction between phenylboronic acid and cis-diol. Using luteolin, riboflavin, and pyrocatechol as model analytes, the enrichment ability of B-COFs as a matrix was examined by MALDI-TOF MS assay, and its high selectivity against target analytes was obtained in the presence of 100 times more anti-nonspecific compounds than that even in the complicated biosample. The limits of detection for luteolin, riboflavin, and pyrocatechol were as low as fg/mL with B-COF enrichment. The B-COFs were further employed and validated for specific enrichment and direct detection of target analytes with complex samples such as human serum, milk, and Capsicum samples. Large surface area, numerous boric-acid active sites, and super stability make B-COFs with high enrichment capacity, high selectivity and sensitivity, satisfying reproducibility, and excellent applicability in MALDI-TOF MS assays.
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Affiliation(s)
- Kun Hu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, College of Chemistry and Pharmaceutical Science , Guangxi Normal University , Guilin 541004 , P. R. China
| | - Yuanxia Lv
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, College of Chemistry and Pharmaceutical Science , Guangxi Normal University , Guilin 541004 , P. R. China
| | - Fanggui Ye
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, College of Chemistry and Pharmaceutical Science , Guangxi Normal University , Guilin 541004 , P. R. China
| | - Tao Chen
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, College of Chemistry and Pharmaceutical Science , Guangxi Normal University , Guilin 541004 , P. R. China
| | - Shulin Zhao
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, College of Chemistry and Pharmaceutical Science , Guangxi Normal University , Guilin 541004 , P. R. China
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10
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Confining analyte droplets on visible Si pillars for improving reproducibility and sensitivity of SALDI-TOF MS. Anal Bioanal Chem 2019; 411:1135-1142. [PMID: 30623222 DOI: 10.1007/s00216-018-01565-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/10/2018] [Accepted: 12/21/2018] [Indexed: 10/27/2022]
Abstract
We present a universal method to efficiently improve reproducibility and sensitivity of surface-assisted laser desorption/ionization time of flight mass spectrometry (SALDI-TOF MS). In this method, the Si pillar array with unique surface wettability is used as substrate for ionizing analyte. The Si pillar is fabricated based on the combination of photolithography and metal-assisted chemical etching, which is of hydrophilic top and hydrophobic bottom and side wall. Based on the surface wettability of the Si pillar, a droplet of an aqueous analyte solution can be confined on the top of the Si pillar. After evaporation of solvent, an analyte deposition spot is formed on the top of Si pillar. The visible size of the Si pillar allows the sample spot to be easily found. Meanwhile, the diameter of the Si pillar is smaller than that of the laser, allowing the observation of all analyte molecules under one laser shot. Therefore, the reproducibility and sensitivity are highly improved with this method, which allows for the quantitative analysis. Furthermore, this method is applicable for different analytes dissolved in water, including amino acids, dye molecules, polypeptides, and polymers. The application of this substrate is demonstrated by analyzing real samples at low concentration. It should be a promising method for sensitive and reproducible detection for SALDI-TOF MS. Graphical abstract ᅟ.
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Tsao CW, Lin YJ, Chen PY, Yang YL, Tan SH. Nanoscale silicon surface-assisted laser desorption/ionization mass spectrometry: environment stability and activation by simple vacuum oven desiccation. Analyst 2018; 141:4973-81. [PMID: 27315049 DOI: 10.1039/c6an00659k] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Nanoscale silicon surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) is an emerging matrix-free, highly sensitive MS analysis method. An important challenge in using nanoscale silicon SALDI-MS analysis is the aging and stability of silicon after storage in various environments. No proper nanoscale silicon SALDI-MS activation procedure has been reported to solve this issue. This study investigated the sensitivity, wettability, and surface oxidation behavior of nanoscale silicon surface SALDI-MS in a room, an inert gas atmosphere, and a vacuum environment. A simple vacuum oven desiccation was proposed to activate the SALDI-MS surface, and the limit of detection was further enhanced 1000 times to a 500 attomole level using this approach. The long-term stability and desorption/ionization mechanism were also investigated.
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Affiliation(s)
- Chia-Wen Tsao
- Department of Mechanical Engineering, National Central University, No. 300, Zhongda Rd., Taoyuan, Taiwan.
| | - Yuan-Jing Lin
- Department of Mechanical Engineering, National Central University, No. 300, Zhongda Rd., Taoyuan, Taiwan.
| | - Pi-Yu Chen
- Agricultural Biotechnology Research Center, Academia Sinica, 128 Academia Road, Taipei, Taiwan
| | - Yu-Liang Yang
- Agricultural Biotechnology Research Center, Academia Sinica, 128 Academia Road, Taipei, Taiwan
| | - Say Hwa Tan
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessels Road, Brisbane, Australia
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12
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Assessing in vitro digestibility of food biopreservative AS-48. Food Chem 2018; 246:249-257. [DOI: 10.1016/j.foodchem.2017.10.149] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 10/11/2017] [Accepted: 10/31/2017] [Indexed: 11/18/2022]
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Meng X, Hu J, Chao Z, Liu Y, Ju H, Cheng Q. Thermoresponsive Arrays Patterned via Photoclick Chemistry: Smart MALDI Plate for Protein Digest Enrichment, Desalting, and Direct MS Analysis. ACS APPLIED MATERIALS & INTERFACES 2018; 10:1324-1333. [PMID: 29239171 DOI: 10.1021/acsami.7b13640] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Sample desalting and concentration are crucial steps before matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) analysis. Current sample pretreatment approaches require tedious fabrication and operation procedures, which are unamenable to high-throughput analysis and also result in sample loss. Here, we report the development of a smart MALDI substrate for on-plate desalting, enrichment, and direct MS analysis of protein digests based on thermoresponsive, hydrophilic/hydrophobic transition of surface-grafted poly(N-isopropylacrylamide) (PNIPAM) microarrays. Superhydrophilic 1-thioglycerol microwells are first constructed on alkyne-silane-functionalized rough indium tin oxide substrates based on two sequential thiol-yne photoclick reactions, whereas the surrounding regions are modified with hydrophobic 1H,1H,2H,2H-perfluorodecanethiol. Surface-initiated atom-transfer radical polymerization is then triggered in microwells to form PNIPAM arrays, which facilitate sample loading and enrichment of protein digests by concentrating large-volume samples into small dots and achieving on-plate desalting through PNIPAM configuration change at elevated temperature. The smart MALDI plate shows high performance for mass spectrometric analysis of cytochrome c and neurotensin in the presence of 1 M urea and 100 mM NaHCO3, as well as improved detection sensitivity and high sequence coverage for α-casein and cytochrome c digests in femtomole range. The work presents a versatile sample pretreatment platform with great potential for proteomic research.
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Affiliation(s)
- Xiao Meng
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
| | - Junjie Hu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
| | - Zhicong Chao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
| | - Ying Liu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
- Department of Chemistry, University of California , Riverside, California 92521, United States
| | - Huangxian Ju
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, P. R. China
| | - Quan Cheng
- Department of Chemistry, University of California , Riverside, California 92521, United States
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14
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Yoon S, Park S, Kim MS, Lee CY. Concomitant desalting and concentration of neuropeptides on a donut-shaped surface pattern for MALDI mass spectrometry. Chem Commun (Camb) 2018; 54:5688-5691. [DOI: 10.1039/c8cc02168f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We demonstrate a functional surface pattern that desalts and concentrates a highly saline solution of neuropeptides in a single step.
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Affiliation(s)
- Sook Yoon
- School of Energy and Chemical Engineering
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- Republic of Korea
| | - Sanghwan Park
- School of Energy and Chemical Engineering
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- Republic of Korea
| | - Min Sun Kim
- Scientific Instruments Reliability Assessment Center
- Korea Basic Science Institute
- Daejeon 34133
- Republic of Korea
| | - Chang Young Lee
- School of Energy and Chemical Engineering
- Ulsan National Institute of Science and Technology (UNIST)
- Ulsan 44919
- Republic of Korea
- School of Life Sciences
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15
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Romson J, Jacksén J, Emmer Å. Simple and Environmentally Friendly Fabrication of Superhydrophobic Alkyl Ketene Dimer Coated MALDI Concentration Plates. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:1733-1736. [PMID: 28405939 PMCID: PMC5507968 DOI: 10.1007/s13361-017-1657-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 03/07/2017] [Accepted: 03/09/2017] [Indexed: 06/07/2023]
Abstract
Here we present a method to manufacture peptide-concentrating MALDI-plates with alkyl ketene dimer (AKD) as a new superhydrophobic coating. The fabrication of the hydrophobic plates included application of AKD by airbrush, and negative contact printing to generate the concentration sites. Deposited sample droplets were contained within the prestructured sites, and self-adjusted onto the site if slightly misplaced. No AKD contamination was observed, and the plates could easily be cleaned and regenerated. The S/N values for four model peptides was about twice as high compared with a standard steel plate and a commercial concentration plate. Graphical Abstract ᅟ.
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Affiliation(s)
- Joakim Romson
- KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, Analytical Chemistry, Stockholm, Sweden
- KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, Organic Chemistry, Stockholm, Sweden
| | - Johan Jacksén
- KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, Analytical Chemistry, Stockholm, Sweden
- Biotage Sweden AB, Uppsala, Sweden
| | - Åsa Emmer
- KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, Analytical Chemistry, Stockholm, Sweden.
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16
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The comparison of CHCA solvent compositions for improving LC-MALDI performance and its application to study the impact of aflatoxin B1 on the liver proteome of diabetes mellitus type 1 mice. PLoS One 2017; 12:e0181423. [PMID: 28738076 PMCID: PMC5524319 DOI: 10.1371/journal.pone.0181423] [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] [Received: 12/09/2016] [Accepted: 06/19/2017] [Indexed: 01/16/2023] Open
Abstract
In nanoflow liquid chromatography-matrix-assisted laser desorption/ionization tandem time-of-flight (nanoLC-MALDI-TOF/TOF) approaches, it is critical to directly apply small amounts of the sample elutes on the sample target using a nanoLC system due to its low flow rate of 200 ~ 300 nl/min. It is recommended to apply a sheath liquid containing a matrix with a several μL/min flow rate at the end of the nanoLC column to ensure a larger co-eluted droplet for more reproducible sample spotting and avoid the laborious task of post-manual matrix spotting. In this study, to achieve a better nanoLC-MALDI performance on sample spotting, we first compared α-Cyano-4-hydroxycinnamic acid (CHCA) solvent composition for efficiently concentrating nanoLC elutes on an anchor chip. The solvent composition of isopropanol (IPA): acetonitrile (ACN):acetone:0.1% Trifluoroacetic acid (TFA) (2:7:7:2) provided strong and homogeneous signals with higher peptide ion yields than the other solvent compositions. Then, nanoLC-MALDI-TOF/TOF was applied to study the impact of aflatoxin B1 on the liver proteome from diabetes mellitus type 1 mice. Aflatoxin B1 (AFB1), produced by Aspergillus flavus and Aspergillus parasiticus is a carcinogen and a known causative agent of liver cancer. To evaluate the effects of long-term exposure to AFB1 on type 1 diabetes mellitus (TIDM), the livers of T1DM control mice and mice treated with AFB1 were analyzed using isotope-coded protein labeling (ICPL)-based quantitative proteomics. Our results showed that gluconeogenesis, lipid, and oxidative phosphorylation mechanisms, normally elevated in T1DM, were disordered following AFB1 treatment. In addition, major urinary protein 1 (MUP1), an indicator of increased insulin sensitivity, was significantly decreased in the T1DM/AFB1 group and may have resulted in higher blood glucose levels compared to the T1DM group. These results indicate that T1DM patients should avoid the AFB1 intake, as they could lead to increased blood glucose levels and disorders of energy-producing mechanisms.
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17
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Kudina O, Eral HB, Mugele F. E-MALDI: optimized conditions during electrowetting-enhanced drop drying for MALDI-MS. JOURNAL OF MASS SPECTROMETRY : JMS 2017; 52:405-410. [PMID: 28422343 DOI: 10.1002/jms.3934] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 04/03/2017] [Accepted: 04/04/2017] [Indexed: 06/07/2023]
Abstract
We recently showed that electrowetting-enhanced sample preparation for MALDI-MS (eMALDI) can increase the intensity of the MALDI signal by 2-25 times compared with conventional drop drying by concentrating all the dried sample in a single spot rather than leaving behind a heterogeneous coffee-stain pattern. Here, we demonstrate that the eMALDI signal enhancement can be further increased to more than 100 times by systematically optimizing the electrowetting actuation frequency and amplitude. This enables 30 times signal increase for a peptide standard. Simultaneously, drop drying times can be reduced approximately five times by increasing the actuation voltage and/or decreasing the initial drop volume. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- O Kudina
- Physics of Complex Fluids, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500, AE, Enschede, The Netherlands
| | - H B Eral
- Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628CB, Delft, The Netherlands
- Van't Hoff Laboratory for Physical and Colloid Chemistry, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands
| | - F Mugele
- Physics of Complex Fluids, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500, AE, Enschede, The Netherlands
- Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628CB, Delft, The Netherlands
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18
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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.
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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.
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19
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Serrano MAC, He H, Zhao B, Ramireddy RR, Vachet RW, Thayumanavan S. Polymer-mediated ternary supramolecular interactions for sensitive detection of peptides. Analyst 2016; 142:118-122. [PMID: 27874898 PMCID: PMC5167624 DOI: 10.1039/c6an01591c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A combination of donor-acceptor and electrostatic interactions in a three-component supramolecular system has been shown to form the basis for selective and sensitive detection of peptides. Different substituents in the polymer and the detection matrix were compared to demonstrate that the favorable donor-acceptor interactions explain the observed signal enhancement. The ternary supramolecular interactions discovered in this work are enabled by the self-packing behavior of amphiphilic homopolymers and their ability to mediate interactions between the detection matrix and peptide that facilitate sensitive detection of peptides.
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Affiliation(s)
- Mahalia A C Serrano
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003-9336, USA.
| | - Huan He
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003-9336, USA.
| | - Bo Zhao
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003-9336, USA.
| | | | - Richard W Vachet
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003-9336, USA.
| | - S Thayumanavan
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003-9336, USA.
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20
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Ferreira RA, Roma-Rodrigues C, Davies LC, Sá-Correia I, Martins-Dias S. A quantitative proteomic approach to highlight Phragmites sp. adaptation mechanisms to chemical stress induced by a textile dyeing pollutant. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 573:788-798. [PMID: 27592466 DOI: 10.1016/j.scitotenv.2016.08.169] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 08/23/2016] [Accepted: 08/23/2016] [Indexed: 06/06/2023]
Abstract
Phragmites sp. is present worldwide in treatment wetlands though the mechanisms involved in the phytoremediation remain unclear. In this study a quantitative proteomic approach was used to study the prompt response and adaptation of Phragmites to the textile dyeing pollutant, Acid Orange 7 (AO7). Previously, it was demonstrated that AO7 could be successfully removed from wastewater and mineralized in a constructed wetland planted with Phragmites sp. This azo dye is readily taken up by roots and transported to the plant aerial part by the xylem. Phragmites leaf samples were collected from a pilot scale vertical flow constructed wetland after 0.25, 3.25 and 24.25h exposure to AO7 (400mgL-1) immediately after a watering cycle used as control. Leaf soluble protein extraction yielded an average of 1560 proteins in a broad pI range (pH3-10) by two-dimensional gel electrophoresis. A time course comparative analysis of leaf proteome revealed that 40 proteins had a differential abundance compared to control (p<0.05) within a 3.25h period. After 24.25h in contact with AO7, leaf proteome was similar to control. Adaptation to AO7 involved proteins related with cellular signalling (calreticulin, Ras-related protein Rab11D and 20S proteasome), energy production and conversion (adenosine triphosphate synthase beta subunit) carbohydrate transport and metabolism (phosphoglucose isomerase, fructose-bisphosphate aldolase, monodehydroascorbate reductase, frutockinase-1 and Hypothetical protein POPTR_0003s12000g and the Uncharacterized protein LOC100272772) and photosynthesis (sedoheptulose-1,7-bisphosphatase and ferredoxin-NADP+ reductase). Therefore, the quantitative proteomic approach used in this work indicates that mechanisms associated with stress cell signalling, energy production, carbohydrate transport and metabolism as well as proteins related with photosynthesis are key players in the initial chemical stress response in the phytoremediation process of AO7.
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Affiliation(s)
- R A Ferreira
- Centre for Natural Resources and the Environment (CERENA), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - C Roma-Rodrigues
- Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - L C Davies
- Centre for Natural Resources and the Environment (CERENA), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - I Sá-Correia
- Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - S Martins-Dias
- Centre for Natural Resources and the Environment (CERENA), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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21
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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'.
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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
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22
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Wang D, Baudys J, Barr JR, Kalb SR. Improved Sensitivity for the Qualitative and Quantitative Analysis of Active Ricin by MALDI-TOF Mass Spectrometry. Anal Chem 2016; 88:6867-72. [PMID: 27264550 DOI: 10.1021/acs.analchem.6b01486] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ricin is a highly toxic protein which causes cell death by blocking protein synthesis and is considered a potential bioterrorism agent. Rapid and sensitive detection of ricin toxin in various types of sample matrices is needed as an emergency requirement for public health and antibioterrorism response. An in vitro MALDI TOF MS-based activity assay that detects ricin mediated depurination of synthetic substrates was improved through optimization of the substrate, reaction conditions, and sample preparation. In this method, the ricin is captured by a specific polycolonal antibody followed by hydrolysis reaction. The ricin activity is determined by detecting the unique cleavage product of synthetic oligomer substrates. The detection of a depurinated substrate was enhanced by using a more efficient RNA substrate and optimizing buffer components, pH, and reaction temperature. In addition, the factors involved in mass spectrometry analysis, such as MALDI matrix, plate, and sample preparation, were also investigated to improve the ionization of the depurinated product and assay reproducibility. With optimized parameters, the limit of detection of 0.2 ng/mL of ricin spiked in buffer and milk was accomplished, representing more than 2 orders of magnitude enhancement in assay sensitivity. Improving assay's ruggeddness or reproducibility also made it possible to quantitatively detect active ricin with 3 orders of magnitude dynamic range.
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Affiliation(s)
- Dongxia Wang
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia 30341, United States
| | - Jakub Baudys
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia 30341, United States
| | - John R Barr
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia 30341, United States
| | - Suzanne R Kalb
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia 30341, United States
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23
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Lu W, Li Y, Li R, Shuang S, Dong C, Cai Z. Facile Synthesis of N-Doped Carbon Dots as a New Matrix for Detection of Hydroxy-Polycyclic Aromatic Hydrocarbons by Negative-Ion Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry. ACS APPLIED MATERIALS & INTERFACES 2016; 8:12976-12984. [PMID: 27180617 DOI: 10.1021/acsami.6b01510] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
N-doping carbon dots (N-CDs) were prepared by microwave-assisted pyrolysis of dl-malic acid and ethanolamine as precursors. The material served as an excellent matrix for the detection of the environmental pollutants hydroxy-polycyclic aromatic hydrocarbons (OH-PAHs) by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) in negative ion mode. The obtained N-CDs exhibited good UV absorption capacity and favorable solubility. The use of the N-CDs matrix exhibited low matrix background interference and was beneficial to improve the signal response due to the specific π-conjugated polyaromatic structure and the doping of nitrogen atoms. The developed method was found to have good reproducibility and sensitivity. The N-CDs as a new matrix also were employed for the detection of OH-PAHs in real PM2.5 samples. The mass concentrations of Σ-hydroxy-pyrene, Σ-dihydroxy-anthraquinone, and Σ-dihydroxy-benzo(a)pyrene on the collected PM2.5 samples ranged from 0.125 to 0.136 ng/m(3), 0.039 to 0.052 ng/m(3), and 0.053 to 0.072 ng/m(3), respectively. This work extends the application field of N-CDs and provides a good candidate of matrix for MALDI-TOF MS detection of environmental pollutants.
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Affiliation(s)
- Wenjing Lu
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University , Taiyuan 030006, China
| | - Yong Li
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University , Taiyuan 030006, China
| | - Ruijin Li
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University , Taiyuan 030006, China
| | - Shaomin Shuang
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University , Taiyuan 030006, China
| | - Chuan Dong
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University , Taiyuan 030006, China
| | - Zongwei Cai
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University , Taiyuan 030006, China
- Partner State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University , 224 Waterloo Road, Kowloon Tong, Hong Kong, SAR, China
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24
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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
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25
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Ballester-Tomás L, Pérez-Torrado R, Rodríguez-Vargas S, Prieto JA, Randez-Gil F. Near-freezing effects on the proteome of industrial yeast strains of Saccharomyces cerevisiae. J Biotechnol 2016; 221:70-7. [DOI: 10.1016/j.jbiotec.2016.01.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 01/18/2016] [Accepted: 01/21/2016] [Indexed: 11/28/2022]
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26
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De Angelis M, Siragusa S, Campanella D, Di Cagno R, Gobbetti M. Comparative proteomic analysis of biofilm and planktonic cells of Lactobacillus plantarum DB200. Proteomics 2015; 15:2244-57. [PMID: 25728239 DOI: 10.1002/pmic.201400363] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 12/30/2014] [Accepted: 02/24/2015] [Indexed: 11/11/2022]
Abstract
This study investigated the relative abundance of extracellular and cell wall associated proteins (exoproteome), cytoplasmic proteins (proteome), and related phenotypic traits of Lactobacillus plantarum grown under planktonic and biofilm conditions. Lactobacillus plantarum DB200 was preliminarily selected due to its ability to form biofilms and to adhere to Caco2 cells. As shown by fluorescence microscope analysis, biofilm cells became longer and autoaggregated at higher levels than planktonic cells. The molar ratio between glucose consumed and lactate synthesised was markedly decreased under biofilm compared to planktonic conditions. DIGE analysis showed a differential exoproteome (115 protein spots) and proteome (44) between planktonic and biofilm L. plantarum DB200 cells. Proteins up- or downregulated by at least twofold (p < 0.05) were found to belong mainly to the following functional categories: cell wall and catabolic process, cell cycle and adhesion, transport, glycolysis and carbohydrate metabolism, exopolysaccharide metabolism, amino acid and protein metabolisms, fatty acid and lipid biosynthesis, purine and nucleotide metabolism, stress response, oxidation/reduction process, and energy metabolism. Many of the above proteins showed moonlighting behavior. In accordance with the high expression levels of stress proteins (e.g., DnaK, GroEL, ClpP, GroES, and catalase), biofilm cells demonstrated enhanced survival under conditions of environmental stress.
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Affiliation(s)
- Maria De Angelis
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, Bari, Italy
| | - Sonya Siragusa
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, Bari, Italy
| | - Daniela Campanella
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, Bari, Italy
| | - Raffaella Di Cagno
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, Bari, Italy
| | - Marco Gobbetti
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, Bari, Italy
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27
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Xu L, Zhu W, Sun R, Ding Y. A Ti4+-immobilized phosphate polymer-patterned silicon substrate for on-plate selective enrichment and self-desalting of phosphopeptides. Analyst 2015; 140:3216-24. [DOI: 10.1039/c5an00102a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A circular hydrophobic–hydrophilic-Ti4+ immobilized phosphate polymer is patterned as the sample support for selective enrichment, wash-free self-desalting and mass spectroscopy (MS) analysis of phosphopeptides.
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Affiliation(s)
- Lei Xu
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Wei Zhu
- Department of Oncology
- First Affiliated Hospital of Nanjing Medical University
- Nanjing 210029
- PR China
| | - Rui Sun
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Yin Ding
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
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Smolira A, Wessely-Szponder J. Importance of the matrix and the matrix/sample ratio in MALDI-TOF-MS analysis of cathelicidins obtained from porcine neutrophils. Appl Biochem Biotechnol 2014; 175:2050-65. [PMID: 25432341 PMCID: PMC4322226 DOI: 10.1007/s12010-014-1405-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 11/13/2014] [Indexed: 11/24/2022]
Abstract
Qualitative and quantitative mass spectrometric studies of biomolecules for example proteins, peptides, or lipids contained in biological samples like physiologic fluids are very important for many fields of science such as medicine, veterinary medicine, biology, biochemistry, molecular biology, or environmental sciences. In the last two decades, MALDI TOF MS — matrix-assisted laser desorption mass spectrometry, proved to be an especially convenient tool for these analyses. The main advantages of this method are its rapidity and high sensitivity which is particularly appreciated in the case of studies of complex biological specimen. A major challenge for many researchers is to maximize this sensitivity, among others, by appropriate procedures of sample preparation for the measurement. The objective of this work was to optimize these procedures, selecting the optimal matrix and optimum proportions of the sample and the matrix solution in a mixture of both solutions, aiming at the achievement of the maximum intensity of ion current. In this respect, five low molecular mass cathelicidins were studied: prophenin-2, protegrins 1–3, PR-39. All of them were obtained directly from the porcine blood. As a result of studies, the authors determined such experimental conditions when the intensity of investigated ionic current had the highest value.
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Affiliation(s)
- Anna Smolira
- Department of Molecular Physics, Institute of Physics, Maria Curie Sklodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031, Lublin, Poland,
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29
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Min Q, Zhang X, Chen X, Li S, Zhu JJ. N-Doped Graphene: An Alternative Carbon-Based Matrix for Highly Efficient Detection of Small Molecules by Negative Ion MALDI-TOF MS. Anal Chem 2014; 86:9122-30. [DOI: 10.1021/ac501943n] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Qianhao Min
- State Key Laboratory of Analytical
Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Xiaoxia Zhang
- State Key Laboratory of Analytical
Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Xueqin Chen
- State Key Laboratory of Analytical
Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Siyuan Li
- State Key Laboratory of Analytical
Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Jun-Jie Zhu
- State Key Laboratory of Analytical
Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
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30
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Liang Q, Macher T, Xu Y, Bao Y, Cassady CJ. MALDI MS In-Source Decay of Glycans Using a Glutathione-Capped Iron Oxide Nanoparticle Matrix. Anal Chem 2014; 86:8496-503. [DOI: 10.1021/ac502422a] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Qiaoli Liang
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Thomas Macher
- Department
of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Yaolin Xu
- Department
of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Yuping Bao
- Department
of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Carolyn J. Cassady
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
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31
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Zeng Z, Wang Y, Guo X, Wang L, Lu N. On-plate self-desalting and matrix-free LDI MS analysis of peptides with a surface patterned sample support. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:895-898. [PMID: 24658805 DOI: 10.1007/s13361-014-0845-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2013] [Revised: 01/02/2014] [Accepted: 01/20/2014] [Indexed: 06/03/2023]
Abstract
A hydrophobic-hydrophilic-hydrophobic pattern has been produced on the surface of a silicon substrate for selective enrichment, self-desalting, and matrix-free analysis of peptides in a single step. Upon sample application, the sample solution is first confined in a small area by a hydrophobic F-SAM outer area, after which salt contaminants and peptides are selectively enriched in the hydrophilic and hydrophobic areas, respectively. Simultaneously, matrix background noise is significantly reduced or eliminated because of immobilization of matrix molecules. As a result, the detection sensitivity is enhanced 20-fold compared with that obtained using the usual MALDI plate, and interference-free detection is achieved in the low m/z range. In addition, peptide ions can be identified unambiguously in the presence of NH₄HCO₃ (100 mM), urea (1 M), and NaCl (1 M). When the device was applied to the analysis of BSA digests, the peptide recovery and protein identification confidence were greatly improved.
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32
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Bernal M, Zhurinsky J, Iglesias-Romero AB, Sanchez-Romero MA, Flor-Parra I, Tomas-Gallardo L, Perez-Pulido AJ, Jimenez J, Daga RR. Proteome-wide search for PP2A substrates in fission yeast. Proteomics 2014; 14:1367-80. [PMID: 24634168 DOI: 10.1002/pmic.201300136] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 02/19/2014] [Accepted: 03/07/2014] [Indexed: 11/10/2022]
Abstract
PP2A (protein phosphatase 2A) is a major phosphatase in eukaryotic cells that plays an essential role in many processes. PP2A mutations in Schizosaccharomyces pombe result in defects of cell cycle control, cytokinesis and morphogenesis. Which PP2A substrates are responsible for these changes is not known. In this work, we searched for PP2A substrates in S. pombe using two approaches, 2D-DIGE analysis of PP2A complex mutants and identification of PP2A interacting proteins. In both cases, we used MS to identify proteins of interest. In the DIGE experiment, we compared proteomes of wild-type S. pombe, deletion of pta2, the phosphoactivator of the PP2A catalytic subunit, and pab1-4, a mutant of B-type PP2A regulatory subunit. A total of 1742 protein spots were reproducibly resolved by 2D-DIGE and 51 spots demonstrated significant changes between PP2A mutants and the wild-type control. MS analysis of these spots identified 27 proteins that include key regulators of glycerol synthesis, carbon metabolism, amino acid biosyntesis, vitamin production, and protein folding. Importantly, we independently identified a subset of these proteins as PP2A binding partners by affinity precipitation, suggesting they may be direct targets of PP2A. We have validated our approach by demonstrating that phosphorylation of Gpd1, a key enzyme in glycerol biogenesis, is regulated by PP2A and that ability of cells to respond to osmotic stress by synthesizing glycerol is compromised in the PP2A mutants. Our work contributes to a better understanding of PP2A function and identifies potential PP2A substrates.
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Affiliation(s)
- Manuel Bernal
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide-Consejo Superior de Investigaciones Científicas, Junta de Andalucía, Sevilla, Spain
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33
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Zeng Z, Wang Y, Guo X, Wang L, Lu N. On-plate glycoproteins/glycopeptides selective enrichment and purification based on surface pattern for direct MALDI MS analysis. Analyst 2013; 138:3032-7. [PMID: 23577342 DOI: 10.1039/c3an00107e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, a novel method has been proposed to achieve selective enrichment and purification of glycoproteins/glycopeptides on a surface patterned sample support, which consists of a hydrophobic outer layer (F-SAM) and an internal boronic acid-modified gold microspot (900 μm). Upon deposition, the sample solution is firstly concentrated in a small area by repulsion of the hydrophobic outer layer, and then the glycoproteins/glycopeptides are selectively captured through boronic acid covalently binding in the inner layer. However, the non-glycosylated proteins/peptides or high concentration salts are removed after rinsing with alkaline solution. As a result, the detection sensitivity is improved by an order of magnitude greater than when using a stainless steel MALDI plate. With surface patterned sample support, the glycoproteins/glycopeptides can be detected even under interference from the excessive existing non-glycosylated proteins/peptides (10 times more than glycoproteins/glycopeptides). Simultaneously, high-quality mass spectra can be obtained even in the presence of urea (1 M), NaCl (1 M), or NH4HCO3 (200 mM). Therefore, this novel technique may be applied to high-throughput analysis of low-abundance glycoproteins/glycopeptides in complicated proteome research.
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Affiliation(s)
- Zhoufang Zeng
- College of Chemistry, Jilin University, Changchun 130012, China
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Škrášková K, Heeren RM. A review of complementary separation methods and matrix assisted laser desorption ionization-mass spectrometry imaging: Lowering sample complexity. J Chromatogr A 2013; 1319:1-13. [DOI: 10.1016/j.chroma.2013.10.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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35
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Siragusa S, De Angelis M, Calasso M, Campanella D, Minervini F, Di Cagno R, Gobbetti M. Fermentation and proteome profiles of Lactobacillus plantarum strains during growth under food-like conditions. J Proteomics 2013; 96:366-80. [PMID: 24231110 DOI: 10.1016/j.jprot.2013.11.003] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 10/30/2013] [Accepted: 11/01/2013] [Indexed: 02/06/2023]
Abstract
UNLABELLED This study aimed at investigating the proteomic adaptation of Lactobacillus plantarum strains. Cultivation of L. plantarum strains under food-like conditions (wheat flour hydrolyzed, whey milk, tomato juice) affected some metabolic traits (e.g., consumption of carbohydrates and synthesis of organic acids) compared to de Man, Rogosa and Sharpe (MRS) broth. The analysis of the fermentation profile showed that the highest number of carbon sources metabolized by L. plantarum strains was found using cells cultivated in media containing low concentration of glucose or no glucose at all. The proteomic maps of the strains were comparatively determined after growth on MRS broth and under food-like conditions. The amount of proteins depended on strain and, especially, on culture conditions. Proteins showing decreased or increased amounts under food-like conditions were identified using MALDI-TOF-MS/MS or LC-nano-ESI-MS/MS. Changes of the proteome concerned proteins that are involved in carbohydrate transport and metabolism, energy metabolism, Sec-dependent secretion system, stress response, nucleotide metabolism, regulation of nitrogen metabolism, and protein biosynthesis. A catabolic repression by glucose on carbohydrate transport and metabolism was also found. The characterization of the proteomes in response to changing environmental conditions could be useful to get L. plantarum strains adapted for specific applications. BIOLOGICAL SIGNIFICANCE Microbial cell performance during food biotechnological processes has become one of the greatest concerns all over the world. L. plantarum is a lactic acid bacterium with a large industrial application for fermented foods or functional foods (e.g., probiotics). The present study compared the fermentation and proteomic profiling of L. plantarum strains during growth under food-like conditions and under optimal laboratory conditions (MRS broth). This study provides specific mechanisms of proteomic adaptation involved in the microbial performances (carbohydrates utilization, energy metabolism, stress resistance, etc.) affecting the main biotechnological tracts of L. plantarum strains. The finding of this study provides evidences that may be exploited to get strains adapted for specific applications in food biotechnology.
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Affiliation(s)
- Sonya Siragusa
- Department of Soil, Plant and Food Science, Via G. Amendola 165/a, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Maria De Angelis
- Department of Soil, Plant and Food Science, Via G. Amendola 165/a, University of Bari Aldo Moro, 70126 Bari, Italy.
| | - Maria Calasso
- Department of Soil, Plant and Food Science, Via G. Amendola 165/a, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Daniela Campanella
- Department of Soil, Plant and Food Science, Via G. Amendola 165/a, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Fabio Minervini
- Department of Soil, Plant and Food Science, Via G. Amendola 165/a, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Raffaella Di Cagno
- Department of Soil, Plant and Food Science, Via G. Amendola 165/a, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Marco Gobbetti
- Department of Soil, Plant and Food Science, Via G. Amendola 165/a, University of Bari Aldo Moro, 70126 Bari, Italy
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36
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Hioki Y, Kuyama H, Hamana C, Takeyama K, Tanaka K. An improved sample preparation method for the sensitive detection of peptides by MALDI-MS. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:1217-1223. [PMID: 24259210 DOI: 10.1002/jms.3283] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 08/20/2013] [Accepted: 09/09/2013] [Indexed: 06/02/2023]
Abstract
We describe here an optimization study of the sample preparation conditions for sensitive detection of peptides by matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). Among many factors in the conditions, we varied the percent acetonitrile in the peptide solution, the percent acetonitrile in the matrix solution and the α-cyano-4-hydroxycinnamic acid (CHCA) concentration in the matrix solution. CHCA was chosen because it is the most frequently used matrix for analyzing peptides. The well-established dried-droplet method was employed for sample deposition. The examined range of the concentration of CHCA was from 0.01 to 10 mg/ml, and the MeCN content of the solvent for matrix/analyte was 10% to 50%. The indicator for the detection sensitivity was the S/N ratio of the peaks of peptides used. Highly increased sensitivity (100- to 1000-fold) was observed for the optimal CHCA concentration of 0.1 mg/ml in 20% MeCN/0.1% aq. trifluoroacetic acid (TFA), as compared with the conventional concentration (10 mg/ml) in 50% MeCN/0.1% aq. TFA. For example, the limit of detection of human ACTH 18-39 was 10 amol/well for the optimal condition but 10 fmol/well for the conventional condition. The optimal condition (0.1 mg/ml CHCA in 20% MeCN/0.1% aq. TFA) was verified with five model peptides and provided significant improvement in sensitivity (by two to three orders of magnitude) compared with the conventional conditions. Optimizing the CHCA concentration and solvent composition significantly improved the detection sensitivity in the analysis of peptides by MALDI-MS.
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Affiliation(s)
- Yusaku Hioki
- Koichi Tanaka Laboratory of Advanced Science and Technology (KTLAST), Shimadzu Corporation, Nishinokyo-Kuwabaracho Nakagyo-ku, Kyoto, 604-8511, Japan
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37
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Identification of novel biomarkers of abdominal aortic aneurysms by 2D-DIGE and MALDI-MS from AAA-thrombus-conditioned media. Methods Mol Biol 2013; 1000:91-101. [PMID: 23585087 DOI: 10.1007/978-1-62703-405-0_8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
In the search for novel biomarkers, noncandidate-based proteomic strategies open up new opportunities to gain a deeper insight into disease processes regarding their molecular mechanisms, the risk factors involved, and the monitoring of disease progression. To carry out these complex analyses, the combined use of gel electrophoresis with mass spectrometry (MS) represents a powerful choice. In addition, the introduction of protein dye labeling has notably improved the reliability of differential expression studies by increasing the statistical significance of the protein candidates. Here, we describe a strategy where different layers (luminal/abluminal) from the intraluminal thrombus (ILT) of human abdominal aortic aneurysm (AAA) patients were incubated in protein-free medium. Then, the levels of the proteins released were compared by two-dimensional differential in-gel electrophoresis (2D-DIGE) and the proteins of interest identified by MS. We consider that the use of tissue-conditioned media could offer a substantial advantage in the analytical study of biological fluids, as they provide a source of proteins to be released to the bloodstream, which could serve as potential circulating biomarkers.
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38
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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
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Baker MR, Li QX. Guanidination of tryptic peptides without desalting for matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry analysis. Anal Chem 2013; 85:8873-80. [PMID: 23964694 DOI: 10.1021/ac402246r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Derivatizations that enhance mass spectral quality often require desalting, which presents as a bottleneck in matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry (MALDI-TOF MS)-proteomics. Guanidination, which converts lysine to homoarginine, an arginine analogue, can increase detection of those peptides 5-15-fold. Our aim was to improve guanidination by using a novel reagent, O-methylisourea-freebase. In a simple reaction, interfering salts were removed prior to guanidination. Freebase preparation took about 30 min and could be applied to samples all at once as opposed to desalting samples one-by-one for 5 min each. For freebase guanidinated BSA tryptic peptides, more than 6-times the peptides were observed relative to tryptic peptides or those guanidinated with the conventional reagent, O-methylisourea hemisulfate. Peptide signals increased more than 10-fold relative to those from guanidination with the conventional reagent and were equivalent to those from conventional guanidination with desalting. In addition, freebase guanidination allowed for a lower limit of detection when combined with another derivatization, N-terminal sulfonation, as evidenced by tandem mass spectrometry (MS/MS) fragmentation analysis of in-gel digests of cytochrome c. Freebase guanidination of rat lung proteins after 2-D gel electrophoresis allowed for identification of all tested protein spots regardless of protein characteristics (MW or pI) or abundance. Co-derivatization with N-terminal sulfonation confirmed the identity of low-abundance proteins in 2-D gel spots that contained more than one protein. The freebase guanidination reagent is simple to prepare and to implement. Desalting is not needed prior to MALDI-TOF MS. Freebase guanidination effectively increases the dynamic range of detection of lysine-containing peptides while decreasing the work needed for sample preparation.
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Affiliation(s)
- Margaret R Baker
- Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa , 1955 East-West Road, Honolulu, Hawaii 96822, United States
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40
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Chen CJ, Lai CC, Tseng MC, Liu YC, Lin SY, Tsai FJ. Simple fabrication of hydrophobic surface target for increased sensitivity and homogeneity in matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis of peptides, phosphopeptides, carbohydrates and proteins. Anal Chim Acta 2013; 783:31-8. [PMID: 23726097 DOI: 10.1016/j.aca.2013.04.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 04/11/2013] [Accepted: 04/14/2013] [Indexed: 11/19/2022]
Abstract
To enhance sample signals and improve homogeneity in matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF) analysis, a simple, rapid, and efficient sample preparation method was developed in this study. Polydimethylsiloxane (PDMS) was coated on a stainless steel MALDI plate, forming a transparent, hydrophobic surface that enhanced sample signals without producing observable background signals. Compared to the use of an unmodified commercial metal MALDI plate, peptide signals were enhanced by ~7.1-11.0-fold due to the reduced sample spot area of the PDMS-coated plate, and showed improved peptide mass fingerprinting (PMF) and MS/MS peptide sequencing results. In the analysis of phosphopeptides and carbohydrates with a 2,5-dihydroxybenzoic acid (DHB) matrix, the PDMS-coated plate showed improved sample homogeneity and signal enhancements of ~5.2-8.2-fold and ~2.8-3.2-fold, respectively. Improved sensitivity in the observation of more unique fragment ions by MS/MS analysis, to successfully distinguish isomeric carbohydrates, was also illustrated. In protein analysis with a sinapinic acid (SA) matrix, a ~3.4-fold signal enhancement was observed. The PDMS film coating was easily removed and refabricated to avoid sample carryover, and was applicable to diverse commercial MALDI plates. The PDMS-coated approach is a simple, practical, and attractive method for enhancing analyte signals and homogeneity.
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Affiliation(s)
- Chao-Jung Chen
- Graduate Institute of Integrated Medicine, China Medical University, Taichung, Taiwan.
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Gustafsson OJR, Eddes JS, Meding S, McColl SR, Oehler MK, Hoffmann P. Matrix-assisted laser desorption/ionization imaging protocol for in situ characterization of tryptic peptide identity and distribution in formalin-fixed tissue. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2013; 27:655-670. [PMID: 23418145 DOI: 10.1002/rcm.6488] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 12/07/2012] [Accepted: 12/10/2012] [Indexed: 06/01/2023]
Abstract
RATIONALE Matrix-assisted laser desorption/ionization (MALDI) imaging mass spectrometry provides the means to map the in situ distribution of tryptic peptides in formalin-fixed clinical tissue samples. The ability to analyze clinical samples is of great importance to further developments in the imaging field. However, there is a requirement in this field of research for additional methods describing the characterization of tryptic peptides by MALDI imaging. METHODS AND RESULTS This protocol gives highly detailed instructions, with examples, for (1) successfully performing tryptic peptide MALDI imaging on formalin-fixed cancer tissue using a MALDI-TOF/TOF MS instrument, (2) tentatively generating identifications through nLC/MS/MS, and (3) validating these identifications by in situ MS/MS of peptides of interest. CONCLUSIONS This protocol provides a detailed and straightforward description of the methods required for groups new to MALDI imaging to begin analysis of formalin-fixed clinical samples.
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Affiliation(s)
- Ove J R Gustafsson
- Adelaide Proteomics Centre, School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, Australia, 5005
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Effects of the peptide pheromone plantaricin A and cocultivation with Lactobacillus sanfranciscensis DPPMA174 on the exoproteome and the adhesion capacity of Lactobacillus plantarum DC400. Appl Environ Microbiol 2013; 79:2657-69. [PMID: 23396346 DOI: 10.1128/aem.03625-12] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
This study aimed at investigating the extracellular and cell wall-associated proteins (exoproteome) of Lactobacillus plantarum DC400 when cultivated on modified chemically defined medium (CDM) supplemented with the chemically synthesized pheromone plantaricin A (PlnA) or cocultured with L. plantarum DPPMA20 or Lactobacillus sanfranciscensis DPPMA174. Compared to monoculture, two-dimensional gel electrophoresis (2-DE) analysis showed that the exoproteome of L. plantarum DC400 was affected by PlnA and cocultivation with strains DPPMA20 and, especially, DPPMA174. The highest similarity of the 2-DE maps was found between DC400 cells cultivated in monoculture and in coculture with strain DPPMA20. Almost all extracellular proteins (22 spots) and cell wall-associated proteins (40 spots) which showed decreased or increased levels of synthesis during growth in CDM supplemented with PlnA and/or in coculture with strain DPPMA20 or DPPMA174 were identified. On the basis of the sequences in the Kyoto Encyclopedia of Genes and Genomes database, changes to the exoproteome concerned proteins involved in quorum sensing (QS), the transport system, stress response, carbohydrate metabolism and glycolysis, oxidation/reduction processes, the proteolytic system, amino acid metabolism, cell wall and catabolic processes, and cell shape, growth, and division. Cultivation with PlnA and cocultivation with strains DPPMA20 and, especially, DPMMA174 markedly increased the capacity of L. plantarum DC400 to form biofilms, to adhere to human Caco-2 cells, and to prevent the adhesion of potential intestinal pathogens. These phenotypic traits were in part related to oversynthesized moonlighting proteins (e.g., DnaK and GroEL, pyruvate kinase, enolase, and glyceraldehyde-3-phosphate dehydrogenase) in response to QS mechanisms and interaction with L. plantarum DPPMA20 and, especially, L. sanfranciscensis DPPMA174.
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Rodriguez-Mahillo AI, Gonzalez-Muñoz M, Vega JM, López JA, Yart A, Kerdelhué C, Camafeita E, Garcia Ortiz JC, Vogel H, Petrucco Toffolo E, Zovi D, Battisti A, Roques A, Moneo I. Setae from the pine processionary moth ( Thaumetopoea pityocampa) contain several relevant allergens. Contact Dermatitis 2012; 67:367-74. [DOI: 10.1111/j.1600-0536.2012.02107.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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44
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Bove CG, Angelis MD, Gatti M, Calasso M, Neviani E, Gobbetti M. Metabolic and proteomic adaptation of Lactobacillus rhamnosus
strains during growth under cheese-like environmental conditions compared to de Man, Rogosa, and Sharpe medium. Proteomics 2012; 12:3206-18. [DOI: 10.1002/pmic.201200157] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 08/20/2012] [Accepted: 08/22/2012] [Indexed: 11/09/2022]
Affiliation(s)
| | - Maria De Angelis
- Department of Soil; Plant and Food Science; University of Bari Aldo Moro; Bari Italy
| | - Monica Gatti
- Department of Food Science; University of Parma; Parma Italy
| | - Maria Calasso
- Department of Soil; Plant and Food Science; University of Bari Aldo Moro; Bari Italy
| | - Erasmo Neviani
- Department of Food Science; University of Parma; Parma Italy
| | - Marco Gobbetti
- Department of Soil; Plant and Food Science; University of Bari Aldo Moro; Bari Italy
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Li J, Inutan ED, Wang B, Lietz CB, Green DR, Manly CD, Richards AL, Marshall DD, Lingenfelter S, Ren Y, Trimpin S. Matrix assisted ionization: new aromatic and nonaromatic matrix compounds producing multiply charged lipid, peptide, and protein ions in the positive and negative mode observed directly from surfaces. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2012; 23:1625-43. [PMID: 22895857 DOI: 10.1007/s13361-012-0413-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Revised: 05/09/2012] [Accepted: 05/11/2012] [Indexed: 05/25/2023]
Abstract
Matrix assisted inlet ionization (MAII) is a method in which a matrix:analyte mixture produces mass spectra nearly identical to electrospray ionization without the application of a voltage or the use of a laser as is required in laserspray ionization (LSI), a subset of MAII. In MAII, the sample is introduced by, for example, tapping particles of dried matrix:analyte into the inlet of the mass spectrometer and, therefore, permits the study of conditions pertinent to the formation of multiply charged ions without the need of absorption at a laser wavelength. Crucial for the production of highly charged ions are desolvation conditions to remove matrix molecules from charged matrix:analyte clusters. Important factors affecting desolvation include heat, vacuum, collisions with gases and surfaces, and even radio frequency fields. Other parameters affecting multiply charged ion production is sample preparation, including pH and solvent composition. Here, findings from over 100 compounds found to produce multiply charged analyte ions using MAII with the inlet tube set at 450 °C are presented. Of the compounds tested, many have -OH or -NH(2) functionality, but several have neither (e.g., anthracene), nor aromaticity or conjugation. Binary matrices are shown to be applicable for LSI and solvent-free sample preparation can be applied to solubility restricted compounds, and matrix compounds too volatile to allow drying from common solvents. Our findings suggest that the physical properties of the matrix such as its morphology after evaporation of the solvent, its propensity to evaporate/sublime, and its acidity are more important than its structure and functional groups.
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Affiliation(s)
- Jing Li
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
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46
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A comparison between MALDI-MS and CE-MS data for biomarker assessment in chronic kidney diseases. J Proteomics 2012; 75:5888-97. [DOI: 10.1016/j.jprot.2012.07.024] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 06/25/2012] [Accepted: 07/16/2012] [Indexed: 11/22/2022]
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47
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Toghi Eshghi S, Li X, Zhang H. Targeted analyte detection by standard addition improves detection limits in matrix-assisted laser desorption/ionization mass spectrometry. Anal Chem 2012; 84:7626-32. [PMID: 22877355 DOI: 10.1021/ac301423f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Matrix-assisted laser desorption/ionization (MALDI) has proven an effective tool for fast and accurate determination of many molecules. However, the detector sensitivity and chemical noise compromise the detection of many invaluable low-abundance molecules from biological and clinical samples. To challenge this limitation, we developed a targeted analyte detection (TAD) technique. In TAD, the target analyte is selectively elevated by spiking a known amount of that analyte into the sample, thereby raising its concentration above the noise level, where we take advantage of the improved sensitivity to detect the presence of the endogenous analyte in the sample. We assessed TAD on three peptides in simple and complex background solutions with various exogenous analyte concentrations in two MALDI matrices. TAD successfully improved the limit of detection (LOD) of target analytes when the target peptides were added to the sample in a concentration close to optimum concentration. The optimum exogenous concentration was estimated through a quantitative method to be approximately equal to the original LOD for each target. Also, we showed that TAD could achieve LOD improvements on an average of 3-fold in a simple and 2-fold in a complex sample. TAD provides a straightforward assay to improve the LOD of generic target analytes without the need for costly hardware modifications.
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Affiliation(s)
- Shadi Toghi Eshghi
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland 21231, United States
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48
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Direct detection of peptides and proteins on a microfluidic platform with MALDI mass spectrometry. Anal Bioanal Chem 2012; 404:1681-9. [DOI: 10.1007/s00216-012-6257-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 07/03/2012] [Accepted: 07/09/2012] [Indexed: 12/27/2022]
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49
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Murray PR. What is new in clinical microbiology-microbial identification by MALDI-TOF mass spectrometry: a paper from the 2011 William Beaumont Hospital Symposium on molecular pathology. J Mol Diagn 2012; 14:419-23. [PMID: 22795961 DOI: 10.1016/j.jmoldx.2012.03.007] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Revised: 02/23/2012] [Accepted: 03/06/2012] [Indexed: 10/28/2022] Open
Abstract
Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS) offers the possibility of accurate, rapid, inexpensive identification of bacteria, fungi, and mycobacteria isolated in clinical microbiology laboratories. The procedures for preanalytic processing of organisms and analysis by MALDI-TOF MS are technically simple and reproducible, and commercial databases and interpretive algorithms are available for the identification of a wide spectrum of clinically significant organisms. Although only limited work has been reported on the use of this technique to identify molds, perform strain typing, or determine antibiotic susceptibility results, these are fruitful areas of promising research. As experience is gained with MALDI-TOF MS, it is expected that the databases will be expanded to resolve many of the current inadequate identifications (eg, no identification, genus-level identification) and algorithms for potential misidentification will be developed. The current lack of Food and Drug Administration approval of any MALDI-TOF MS system for organism identification limits widespread use in the United States.
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Affiliation(s)
- Patrick R Murray
- Scientific Affairs, Becton Dickinson Diagnostic Systems, Sparks, Maryland 21152, USA.
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50
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Zhu X, Wu L, Mungra DC, Xia S, Zhu J. Au@SiO2 core-shell nanoparticles for laser desorption/ionization time of flight mass spectrometry. Analyst 2012; 137:2454-8. [PMID: 22457874 DOI: 10.1039/c2an35074b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS), the analysis capability, especially for small molecules, is often compromised by the addition of organic matrices due to the existence of background signals. Herein we report a new detection method on the utility of core-shell nanoparticles (CSNPs) as energy transfer structure in LDI-TOF-MS. The LDI-TOF-MS based on gold-silica core-shell nanoparticles with ultrathin silica shell of 2-4 nm (Au@utSiO(2) CSNPs) was effectively applied to the analysis of many compounds, especially for small functional molecules and polymers, which was more promising than MALDI-TOF-MS.
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Affiliation(s)
- Xiaoqing Zhu
- Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, China
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