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Detection of Cadmium-related ions by MALDI TOF mass spectrometry correlates with physicochemical properties of Cadmium/matrix adducts. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Houdová D, Soto J, Castro R, Rodrigues J, Soledad Pino-González M, Petković M, Bandosz TJ, Algarra M. Chemically heterogeneous carbon dots enhanced cholesterol detection by MALDI TOF mass spectrometry. J Colloid Interface Sci 2021. [DOI: https://doi.org/10.1016/j.jcis.2021.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Houdová D, Soto J, Castro R, Rodrigues J, Soledad Pino-González M, Petković M, Bandosz TJ, Algarra M. Chemically heterogeneous carbon dots enhanced cholesterol detection by MALDI TOF mass spectrometry. J Colloid Interface Sci 2021; 591:373-383. [PMID: 33631525 DOI: 10.1016/j.jcis.2021.02.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/01/2021] [Accepted: 02/02/2021] [Indexed: 02/08/2023]
Abstract
A binary system composed of carbon dots (CDs) and N-doped CDs (N-CDs) embedded in an organic matrix was used for the analysis of cholesterol by MALDI (matrix-assisted laser desorption and ionization time-of-flight) mass spectrometry, as a model for detection of small, biologically relevant molecules. The results showed that both CDs are sensitive to the cholesterol and can be used either alone or in a binary system with 2,5-dihydroxybenzoic acid (DHB) to enhance the detection process. It was found that both COOH and NH2 groups on CDs surface contributed to the enhancement in the cholesterol detection by MALDI mass spectrometry in the presence of inorganic cations. Nevertheless, in the presence of NaCl, N-CDs led to a better reproducibility of results. It was due to the coexistence of positive and negative charge on N-CDs surface that led to a homogeneous analyte/substrate distribution, which is an important detection parameter. The enhancing effect of carbon dots was linked to a negative Gibbs energy of the complex formation between CDs, Na+, cholesterol and DHB, and it was supported by theoretical calculations. Moreover, upon the addition of CDs/N-CDs, such features as a low ionization potential, vertical excitation, dipole moment and oscillator strength positively affected the cholesterol detection by MALDI in the presence of Na+.
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Affiliation(s)
- Dominika Houdová
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
| | - Juan Soto
- Department of Physical Chemistry. Faculty of Science, University of Málaga. Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Rita Castro
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
| | - João Rodrigues
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
| | - Mª Soledad Pino-González
- Department of Organic Chemistry. Faculty of Science, University of Málaga. Campus de Teatinos s/n, 29071 Málaga, Spain
| | - Marijana Petković
- VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia.
| | - Teresa J Bandosz
- Department of Chemistry and Biochemistry, The City College of New York, 160 Convent Ave, New York, NY, 10031, USA.
| | - Manuel Algarra
- Department of Inorganic Chemistry. Faculty of Science, University of Málaga. Campus de Teatinos s/n, 29071 Málaga, Spain.
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Yu J, Kang Y, Zhang H, Yang F, Zhen H, Zhu X, Wu T, Du Y. A Polymer-Based Matrix for Effective SALDI Analysis of Lipids. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:1189-1195. [PMID: 33904725 DOI: 10.1021/jasms.1c00010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Surface-assisted laser desorption/ionization (SALDI) has become an attractive branch of matrix-assisted laser desorption/ionization (MALDI) and has been successfully applied for the detection of small molecules due to the lack of the interference of matrix. Herein, the low-cost and highly accessible polyvinylidene fluoride (PVDF) was modified using a facile alkali treatment and investigated as a SALDI matrix. The modified PVDF has a strong optical absorption and can be applied as a dual-mode substrate for both SALDI MS and SALDI imaging analysis. Modified PVDF powder showed superior performance in SALDI MS analysis of lipids, with good reproducibility, high sensitivity, and low background interference, especially for triacylglycerols (TAGs) and fatty acids. Additionally, the lipids in raw and extracted serum were both successfully determined with modified PVDF powder. A modified PVDF membrane (m-PVDF-m) showed excellent ability in lipids imaging in tissues due to its flat surface, mass signal enhancement, and elimination of matrix coating. The distribution of several TAGs and cholesteryl esters on mouse kidney section was presented by SALDI imaging directly on m-PVDF-m. These results demonstrated that modified PVDF materials presented exciting opportunities as matrices for the first time in SALDI MS acquisition and SALDI imaging.
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Affiliation(s)
- Jing Yu
- School of Chemistry and Molecular Engineering & Shanghai Key Laboratory of Functional Materials Chemistry, and Research Centre of Analysis and Test, East China University of Science and Technology, Shanghai 200237, China
| | - Yan Kang
- School of Chemistry and Molecular Engineering & Shanghai Key Laboratory of Functional Materials Chemistry, and Research Centre of Analysis and Test, East China University of Science and Technology, Shanghai 200237, China
| | - Hongyang Zhang
- School of Chemistry and Molecular Engineering & Shanghai, East China University of Science and Technology, Shanghai 200237, China
| | - Feng Yang
- Department of Laboratory Medicine, Huadong Hospital Affiliated to Fudan University, Shanghai, China
| | - Huajun Zhen
- School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China
| | - Xixi Zhu
- School of Chemistry and Molecular Engineering & Shanghai Key Laboratory of Functional Materials Chemistry, and Research Centre of Analysis and Test, East China University of Science and Technology, Shanghai 200237, China
| | - Ting Wu
- School of Chemistry and Molecular Engineering & Shanghai Key Laboratory of Functional Materials Chemistry, and Research Centre of Analysis and Test, East China University of Science and Technology, Shanghai 200237, China
| | - Yiping Du
- School of Chemistry and Molecular Engineering & Shanghai Key Laboratory of Functional Materials Chemistry, and Research Centre of Analysis and Test, East China University of Science and Technology, Shanghai 200237, China
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Garcia MM, Wrobel K, Barrientos EY, Escobosa ARC, Serrano O, Donis IE, Wrobel K. Determination of copper and lead in tequila by conventional matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and partial least squares regression. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:2174-2184. [PMID: 30280437 DOI: 10.1002/rcm.8297] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 08/08/2018] [Accepted: 09/26/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Quantification of small molecules by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) is challenging yet attractive, due to micro-scale procedural simplicity, high throughput and lack of memory effects. Since these features are important while analyzing trace elements in quality control schemes, MALDI-TOFMS was used for the determination of copper (Cu) and lead (Pb) in tequila with quantification carried out by partial least squares regression (PLS2) and by univariate calibration (UC). METHODS In the proposed procedure, Bi(III) was added as internal standard (IS), diethyldithiocarbamate complexes were formed (pH 7.4) and extracted into chloroform; after solvent evaporation and re-constitution in acetonitrile, the sample was co-crystallized with α-cyano-4-hydroxycinnamic acid on a steel target. From the acquired mass spectra, UC was performed using IS-normalized signals of the monoisotopic ions of analytes, and the m/z range 350-513 was used for PLS2. Accuracy was tested by recovery experiments and by inductively coupled plasma (ICP)-MS analysis. RESULTS When compared with direct analyte signal measurements, application of IS yielded enhanced analytical performance using either UC or PLS2; the method quantification limits were: 11.1 μg L-1 , 23.4 μg L-1 for Cu and 89.8 μg L-1 , 97.1 μg L-1 for Pb, respectively. In tequila, MALDI-TOFMS and ICP-MS provided consistent results for Cu (165-2599 μg L-1 ); Pb was not detected in any sample by MALDI-TOFMS, yet recoveries obtained after standard addition were indicative of acceptable accuracy (400 μg L-1 Pb added; recoveries: 91.2-108% for UC and 98.8-120% for PLS2). CONCLUSIONS New experimental evidence has been provided supporting the inclusion of trace metals quantification within a range of MALDI-TOFMS applications. Slightly better results were obtained for UC as compared with PLS2 yet both methods can be recommended for testing the compliance of Cu and Pb levels with Official Mexican Norm. Of note, while using PLS2, there is no need for signal integration nor for IS normalization.
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Affiliation(s)
- Manuel Mendez Garcia
- Department of Chemistry, University of Guanajuato, L de Retana N°5, 36000, Guanajuato, Mexico
| | - Kazimierz Wrobel
- Department of Chemistry, University of Guanajuato, L de Retana N°5, 36000, Guanajuato, Mexico
| | - Eunice Yanez Barrientos
- Department of Chemistry, University of Guanajuato, L de Retana N°5, 36000, Guanajuato, Mexico
| | | | - Oracio Serrano
- Department of Chemistry, University of Guanajuato, L de Retana N°5, 36000, Guanajuato, Mexico
| | - Israel Enciso Donis
- Department of Chemistry, University of Guanajuato, L de Retana N°5, 36000, Guanajuato, Mexico
| | - Katarzyna Wrobel
- Department of Chemistry, University of Guanajuato, L de Retana N°5, 36000, Guanajuato, Mexico
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Olaitan AD, Ward S, Barnes LF, Yount JR, Zanca BA, Schwieg JI, McCoy AL, Molek KS. Small- and large-sized iron(II, III) oxide nanoparticles for surface-assisted laser desorption/ionization mass spectrometry of small biomolecules. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:1887-1896. [PMID: 30067884 PMCID: PMC6743475 DOI: 10.1002/rcm.8249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 06/26/2018] [Accepted: 07/16/2018] [Indexed: 05/15/2023]
Abstract
RATIONALE Common surface-assisted laser desorption/ionization (SALDI) surfaces are functionalized to improve mass spectrometric detection. Such surfaces are selective to certain group(s) of compounds. The application of universal and sensitive SALDI surfaces with appropriate size/surface area is paramount. In this study, two different sizes/surface areas of Fe3 O4 are compared as SALDI surfaces. METHODS For accurate surface area comparisons, the physical properties of the Fe3 O4 nanoparticles used as SALDI surfaces were determined using scanning electron microscopy, X-ray diffractometry, and N2 Brunauer-Emmet-Teller adsorption techniques. SALDI mass spectrometry (MS) data were acquired using a time-of-flight (TOF) mass spectrometer operated in the linear mode and equipped with a 50-Hz pulsed nitrogen laser (at 337 nm). Small biomolecules (adenosine, glucose, sucrose, tryptophan, and tripeptide) and a real sample (human serum) were analyzed. RESULTS The average sizes/specific surface areas of the SALDI surfaces of the small- and large-sized Fe3 O4 nanoparticles were ~21 nm/~82 m2 /g and ~39 nm/~38 m2 /g, respectively. An overall ~2.0-fold enhancement in signal-to-noise ratios was observed for the ionic species of the analyzed biomolecules in SALDI-MS using small-sized Fe3 O4 in comparison to large-sized Fe3 O4 nanoparticles. MS sensitivity from adenosine calibration curves (concentration between 0.05 and 10.0 mM) was ~2.0-fold higher for small-sized than large-sized Fe3 O4 nanoparticles as SALDI surfaces. CONCLUSIONS We have shown that transition-metal oxides such as Fe3 O4 nanoparticles are suitable and efficient surfaces for SALDI-TOF-MS analysis of small biomolecules. We observed improvement in signal-to-noise ratios and detection sensitivity for the analyzed samples from SALDI surfaces using small-sized (possessing larger surface area) than large-sized Fe3 O4 nanoparticles.
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Affiliation(s)
- Abayomi D. Olaitan
- Department of Chemistry, University of West Florida, Pensacola, FL 32514
| | - Savanna Ward
- Department of Chemistry, University of West Florida, Pensacola, FL 32514
| | - Lauren F. Barnes
- Department of Chemistry, University of West Florida, Pensacola, FL 32514
| | - Joseph R. Yount
- Department of Chemistry, University of West Florida, Pensacola, FL 32514
| | - Bryan A. Zanca
- Department of Chemistry, University of West Florida, Pensacola, FL 32514
| | - Julia I. Schwieg
- Department of Chemistry, University of West Florida, Pensacola, FL 32514
| | - Alyssa L. McCoy
- Department of Chemistry, University of West Florida, Pensacola, FL 32514
| | - Karen S. Molek
- Department of Chemistry, University of West Florida, Pensacola, FL 32514
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7
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Olaitan AD, Reyes KA, Barnes LF, Yount JR, Ward S, Hamilton HSC, King KE, Van Leeuwen CJ, Stepherson JR, Vargas TK, Kirkconnell MP, Molek KS. Transition metal oxide nanoparticles as surfaces for surface-assisted laser desorption/ionization mass spectrometry of asphaltenes. PETROLEUM SCIENCE AND TECHNOLOGY 2017; 35:1917-1924. [PMID: 30880901 PMCID: PMC6420218 DOI: 10.1080/10916466.2017.1370476] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the first use of NiO, Fe3O4, TiO2, and Co3O4 nanoparticles as surfaces for surface-assisted laser desorption/ionization (SALDI) mass spectrometry of asphaltenes. Higher signal-to-noise ratios (S/Ns) for asphaltene species were observed using NiO and Fe3O4 nanoparticles for SALDI as compared to LDI, where both surfaces consistently provided 2- to 3-fold improved S/Ns. The new SALDI detection method showed reliable adsorption data measuring supernatant solutions after 24 hour asphaltene adsorption on NiO, Fe3O4, and Co3O4. These results indicated that NiO has a higher adsorption affinity than Fe3O4 and Co3O4 for asphaltene molecules, corroborating reported asphaltene adsorption on metal oxide nanoparticles.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Karen S. Molek
- Corresponding Author: Dr. Karen S. Molek, Department of Chemistry, University of West Florida, Pensacola, FL 32514, USA. Telephone number: (850) 474-2799, Fax: (850) 474-2621,
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SALDI-TOF-MS analyses of small molecules (citric acid, dexasone, vitamins E and A) using TiO2 nanocrystals as substrates. Anal Bioanal Chem 2016; 408:7481-90. [DOI: 10.1007/s00216-016-9846-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 06/28/2016] [Accepted: 07/28/2016] [Indexed: 11/25/2022]
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9
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Nišavić M, Masnikosa R, Butorac A, Perica K, Rilak A, Korićanac L, Hozić A, Petković M, Cindrić M. Elucidation of the binding sites of two novel Ru(II) complexes on bovine serum albumin. J Inorg Biochem 2016; 159:89-95. [DOI: 10.1016/j.jinorgbio.2016.02.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 02/25/2016] [Accepted: 02/28/2016] [Indexed: 10/22/2022]
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Popović I, Nešić M, Vranješ M, Šaponjić Z, Petković M. TiO2 nanocrystals – assisted laser desorption and ionization time-of-flight mass spectrometric analysis of steroid hormones, amino acids and saccharides. Validation and comparison of methods. RSC Adv 2016. [DOI: 10.1039/c5ra20042c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The possibilities for the application of various TiO2 nanocrystals for substrate-assisted laser desorption/ionization time-of-flight mass spectrometric quantitative analysis of steroid hormones, amino acids and saccharides is presented in this work.
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Affiliation(s)
- I. Popović
- Vinča Institute of Nuclear Sciences
- University of Belgrade
- 11000 Belgrade
- Republic of Serbia
| | - M. Nešić
- Vinča Institute of Nuclear Sciences
- University of Belgrade
- 11000 Belgrade
- Republic of Serbia
| | - M. Vranješ
- Vinča Institute of Nuclear Sciences
- University of Belgrade
- 11000 Belgrade
- Republic of Serbia
| | - Z. Šaponjić
- Vinča Institute of Nuclear Sciences
- University of Belgrade
- 11000 Belgrade
- Republic of Serbia
| | - M. Petković
- Vinča Institute of Nuclear Sciences
- University of Belgrade
- 11000 Belgrade
- Republic of Serbia
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Jovanović S, Petrović B, Petković M, Bugarčić ŽD. Kinetics and mechanism of substitution reactions of the new bimetallic [{PdCl(bipy)}{μ-(NH2(CH2)6H2N)}{PtCl(bipy)}]Cl(ClO4) complex with important bio-molecules. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.09.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Jovanović S, Bogojeski J, Petković M, Bugarčić ŽD. Interactions of nitrogen-donor bio-molecules with dinuclear platinum(II) complexes. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1048240] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Snežana Jovanović
- Faculty of Science, Department of Chemistry, University of Kragujevac, Kragujevac, Serbia
| | - Jovana Bogojeski
- Faculty of Science, Department of Chemistry, University of Kragujevac, Kragujevac, Serbia
| | - Marijana Petković
- Department of Physical Chemistry, Institute of Nuclear Sciences ‘‘Vinča”, University of Belgrade, Belgrade, Serbia
| | - Živadin D. Bugarčić
- Faculty of Science, Department of Chemistry, University of Kragujevac, Kragujevac, Serbia
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Frański R, Zembald M, Zalas M, Gierczyk B, Cegłowski M, Schroeder G. Formation of the [M+Cu+4Cl]+ ion under laser desorption ionization conditions as a result of Cl addition to a C ≡ C bond (M - methyl or ethyl ester of 3,5-bis(2,2'-bipyridin-4-ylethynyl)benzoic acid). RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:2759-2762. [PMID: 25380499 DOI: 10.1002/rcm.7067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 09/29/2014] [Accepted: 09/29/2014] [Indexed: 06/04/2023]
Affiliation(s)
- Rafał Frański
- Adam Mickiewicz University, Faculty of Chemistry, Umultowska 89B, 61-614, Poznań, Poland
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Kamčeva T, Radisavljević M, Vukićević I, Arnhold J, Petković M. Interactions of platinum and ruthenium coordination complexes with pancreatic phospholipase A(2) and phospholipids investigated by MALDI TOF mass spectrometry. Chem Biodivers 2014; 10:1972-86. [PMID: 24243606 DOI: 10.1002/cbdv.201300141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Indexed: 11/07/2022]
Abstract
Phospholipase A2 is involved in propagation of inflammatory processes and carcinogenesis through its role in phospholipid metabolism, and release of arachidonic acid and lysophospholipids. Recent findings on correlation between elevated PLA2 activity and metastatic cancer render this enzyme an attractive target for cancer therapy. On the other hand, due to a broad range of oxidation states under physiological conditions and a high affinity for protein binding, platinum and ruthenium coordination complexes are promising candidates for PLA2 inhibitors. In this article, we discuss the interactions of Pt and Ru coordination complexes with PLA2 and phospholipids, as well as the application of MALDI-TOF mass spectrometry for screening PLA2 inhibitors. Owing to the ability of this technique to simultaneously detect and monitor changes in substrate and product concentrations, the inhibitor mechanisms of both Pt and Ru complexes with various ligands were determined.
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Affiliation(s)
- Tina Kamčeva
- 'Vinča' Institute of Nuclear Sciences, Department of Physical Chemistry, University of Belgrade, Mike Petrovića Alasa 12-14, RS-11001 Belgrade (phone: +381 11 3408 64; fax: +381 11 8066 434); Haukeland University Hospital, Laboratory of Clinical Biochemistry, Section of Clinical Pharmacology, Jonas Lies Vei 65, NO-5020 Bergen (phone: +47 46 572612; fax:+47 55 290 718).
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15
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Chiu TC. Recent advances in bacteria identification by matrix-assisted laser desorption/ionization mass spectrometry using nanomaterials as affinity probes. Int J Mol Sci 2014; 15:7266-80. [PMID: 24786089 PMCID: PMC4057671 DOI: 10.3390/ijms15057266] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 04/14/2014] [Accepted: 04/16/2014] [Indexed: 02/01/2023] Open
Abstract
Identifying trace amounts of bacteria rapidly, accurately, selectively, and with high sensitivity is important to ensuring the safety of food and diagnosing infectious bacterial diseases. Microbial diseases constitute the major cause of death in many developing and developed countries of the world. The early detection of pathogenic bacteria is crucial in preventing, treating, and containing the spread of infections, and there is an urgent requirement for sensitive, specific, and accurate diagnostic tests. Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is an extremely selective and sensitive analytical tool that can be used to characterize different species of pathogenic bacteria. Various functionalized or unmodified nanomaterials can be used as affinity probes to capture and concentrate microorganisms. Recent developments in bacterial detection using nanomaterials-assisted MALDI-MS approaches are highlighted in this article. A comprehensive table listing MALDI-MS approaches for identifying pathogenic bacteria, categorized by the nanomaterials used, is provided.
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Affiliation(s)
- Tai-Chia Chiu
- Department of Applied Science, National Taitung University, 684 Section 1, Chunghua Road, Taitung 95002, Taiwan.
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16
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Cegłowski M, Jasiecki S, Schroeder G. Laser desorption/ionization mass spectrometric analysis of folic acid, vancomycin and Triton® X-100 on variously functionalized carbon nanotubes. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2013; 27:2631-2638. [PMID: 24591024 DOI: 10.1002/rcm.6728] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 08/29/2013] [Accepted: 09/02/2013] [Indexed: 06/03/2023]
Abstract
RATIONALE Carbon nanotubes (CNTs) have been ascertained to constitute versatile assisting matrices for laser desorption/ionization mass spectrometric analysis of different molecules. The functionalization thereof can lead to obtaining laser desorption/ionization assisting surfaces that would allow the detection of molecules at lower concentration and produce spectra with a better signal-to-noise ratio. METHODS Pristine, -OH and -COOH functionalized multi-walled CNTs were obtained from commercial suppliers. Gallic or sinapinic acid was attached covalently to the CNT surfaces by forming an ester bond. Folic acid, vancomycin and Triton(®) X-100 were used as analytes to examine properties of these new assisting surfaces. Mass spectrometry analysis was conducted on a matrix-assisted laser desorption/ionization quadrupole time-of-flight (MALDIQTOF) mass spectrometer. RESULTS The functionalization of CNTs was confirmed with Fourier transform infrared (FTIR) spectroscopy. The obtained mass spectra revealed that all the assisting surfaces are capable of transferring energy to the analytes; moreover, the presence of carboxyl groups in the structures of CNTs highly enhances their ionization properties. Nevertheless, the presence of sinapinic acid on CNT surfaces does not increase their properties to absorb pulse laser energy. CONCLUSIONS The presented assisting surfaces are effective in LDI mass analysis of folic acid, vancomycin and Triton(®) X-100. The appropriate functionalization of CNTs can lead to the production of assisting surfaces that can become highly effective in the ionization of particular types of analytes.
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Affiliation(s)
- Michał Cegłowski
- Faculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614, Poznan, Poland
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17
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Radisavljević M, Kamceva T, Vukićević I, Nisavić M, Milovanović M, Petković M. Sensitivity and accuracy of organic matrix-assisted laser desorption and ionisation mass spectrometry of FeCl3 is higher than in in matrix-free approach. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2013; 19:77-89. [PMID: 24261080 DOI: 10.1255/ejms.1217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We compare the quality and reliability of laser desorption and ionisation mass spectra of FeCl3 acquired without the assistance of the matrix with the spectra acquired with different organic matrix molecules. Generally, inorganic salts tend to form clusters upon laser irradiation, the signals of which can be easily distinguished from ions arising from the matrix. In the presence of a matrix, cluster ions are, however, mostly suppressed. We have compared the number of analyte signals, accuracy of determination of isotope composition of the analyte and the sensitivity of FeCl3 detection between different approaches. The results obtained imply that the sensitivity of mass spectrometric analysis of FeCl3 is somewhat higher when matrices are applied than in the matrix-free approach. Among all matrices tested in this work, F20TPP seems to be the most promising for further applications as a matrix for mass spectrometry of inorganic salts.
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Affiliation(s)
- Maja Radisavljević
- Laboratory of Physical Chemistry, Vinća, Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia.
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