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Villette C, Maurer L, Zumsteg J, Mutterer J, Wanko A, Heintz D. Mass spectrometry imaging for biosolids characterization to assess ecological or health risks before reuse. Nat Commun 2023; 14:4244. [PMID: 37454165 PMCID: PMC10349827 DOI: 10.1038/s41467-023-40051-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 07/06/2023] [Indexed: 07/18/2023] Open
Abstract
Biosolids are byproducts of wastewater treatment. With the increasing global population, the amounts of wastewater to be treated are expanding, along with the amounts of biosolids generated. The reuse of biosolids is now accepted for diversified applications in fields such as agriculture, engineering, agro-forestry. However, biosolids are known to be potential carriers of compounds that can be toxic to living beings or alter the environment. Therefore, biosolid reuse is subject to regulations, mandatory analyses are performed on heavy metals, persistent organic pollutants or pathogens. Conventional methods for the analysis of heavy metals and persistent organic pollutants are demanding, lengthy, and sometimes unsafe. Here, we propose mass spectrometry imaging as a faster and safer method using small amounts of material to monitor heavy metals and persistent organic pollutants in different types of biosolids, allowing for ecological and health risk assessment before reuse. Our methodology can be extended to other soil-like matrices.
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Affiliation(s)
- Claire Villette
- Plant Imaging & Mass Spectrometry (PIMS), Institut de biologie moléculaire des plantes, CNRS, Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France
| | - Loïc Maurer
- Université de Strasbourg, CNRS, ENGEES, ICube UMR 7357, F-67000, Strasbourg, France
| | - Julie Zumsteg
- Plant Imaging & Mass Spectrometry (PIMS), Institut de biologie moléculaire des plantes, CNRS, Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France
| | - Jérôme Mutterer
- Microscopie et Imagerie Cellulaire, Institut de biologie moléculaire des plantes, CNRS, Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France
| | - Adrien Wanko
- Université de Strasbourg, CNRS, ENGEES, ICube UMR 7357, F-67000, Strasbourg, France
| | - Dimitri Heintz
- Plant Imaging & Mass Spectrometry (PIMS), Institut de biologie moléculaire des plantes, CNRS, Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France.
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2
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Høiem TS, Andersen MK, Martin-Lorenzo M, Longuespée R, Claes BSR, Nordborg A, Dewez F, Balluff B, Giampà M, Sharma A, Hagen L, Heeren RMA, Bathen TF, Giskeødegård GF, Krossa S, Tessem MB. An optimized MALDI MSI protocol for spatial detection of tryptic peptides in fresh frozen prostate tissue. Proteomics 2022; 22:e2100223. [PMID: 35170848 PMCID: PMC9285595 DOI: 10.1002/pmic.202100223] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 01/19/2022] [Accepted: 02/07/2022] [Indexed: 11/29/2022]
Abstract
MALDI MS imaging (MSI) is a powerful analytical tool for spatial peptide detection in heterogeneous tissues. Proper sample preparation is crucial to achieve high quality, reproducible measurements. Here we developed an optimized protocol for spatially resolved proteolytic peptide detection with MALDI time‐of‐flight MSI of fresh frozen prostate tissue sections. The parameters tested included four different tissue washes, four methods of protein denaturation, four methods of trypsin digestion (different trypsin densities, sprayers, and incubation times), and five matrix deposition methods (different sprayers, settings, and matrix concentrations). Evaluation criteria were the number of detected and excluded peaks, percentage of high mass peaks, signal‐to‐noise ratio, spatial localization, and average intensities of identified peptides, all of which were integrated into a weighted quality evaluation scoring system. Based on these scores, the optimized protocol included an ice‐cold EtOH+H2O wash, a 5 min heating step at 95°C, tryptic digestion incubated for 17h at 37°C and CHCA matrix deposited at a final amount of 1.8 μg/mm2. Including a heat‐induced protein denaturation step after tissue wash is a new methodological approach that could be useful also for other tissue types. This optimized protocol for spatial peptide detection using MALDI MSI facilitates future biomarker discovery in prostate cancer and may be useful in studies of other tissue types.
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Affiliation(s)
- Therese S Høiem
- Department of Circulation and Medical Imaging, NTNU - Norwegian University of Science and Technology, Trondheim, Norway
| | - Maria K Andersen
- Department of Circulation and Medical Imaging, NTNU - Norwegian University of Science and Technology, Trondheim, Norway
| | - Marta Martin-Lorenzo
- Maastricht MultiModal Molecular Imaging Institute (M4I), Maastricht University, Maastricht, Netherlands
| | - Rémi Longuespée
- Department of Clinical Pharmacology and Pharmacoepidemiology, Heidelberg University Hospital, Heidelberg, Germany
| | - Britt S R Claes
- Maastricht MultiModal Molecular Imaging Institute (M4I), Maastricht University, Maastricht, Netherlands
| | - Anna Nordborg
- Department of Biotechnology and Nanomedicine, SINTEF Industry, Trondheim, Norway
| | - Frédéric Dewez
- Maastricht MultiModal Molecular Imaging Institute (M4I), Maastricht University, Maastricht, Netherlands
| | - Benjamin Balluff
- Maastricht MultiModal Molecular Imaging Institute (M4I), Maastricht University, Maastricht, Netherlands
| | - Marco Giampà
- Department of Clinical and Molecular Medicine, NTNU - Norwegian University of Science and Technology, Trondheim, Norway
| | - Animesh Sharma
- Department of Clinical and Molecular Medicine, NTNU - Norwegian University of Science and Technology, Trondheim, Norway.,PROMEC Core Facility for Proteomics and Modomics, NTNU - Norwegian University of Science and Technology and the Central Norway Regional Health Authority Norway, Trondheim, Norway
| | - Lars Hagen
- Department of Clinical and Molecular Medicine, NTNU - Norwegian University of Science and Technology, Trondheim, Norway.,PROMEC Core Facility for Proteomics and Modomics, NTNU - Norwegian University of Science and Technology and the Central Norway Regional Health Authority Norway, Trondheim, Norway.,Clinic of Laboratory Medicine, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
| | - Ron M A Heeren
- Maastricht MultiModal Molecular Imaging Institute (M4I), Maastricht University, Maastricht, Netherlands
| | - Tone F Bathen
- Department of Circulation and Medical Imaging, NTNU - Norwegian University of Science and Technology, Trondheim, Norway.,Department of radiology and nuclear medicine, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
| | - Guro F Giskeødegård
- K.G. Jebsen Center for Genetic Epidemiology, Department of Public Health and Nursing, NTNU - Norwegian University of Science and Technology, Trondheim, Norway
| | - Sebastian Krossa
- Department of Circulation and Medical Imaging, NTNU - Norwegian University of Science and Technology, Trondheim, Norway
| | - May-Britt Tessem
- Department of Circulation and Medical Imaging, NTNU - Norwegian University of Science and Technology, Trondheim, Norway.,Department of Surgery, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
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3
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Sun Q, Zhang S, Huang W, Wang R, Chen Z, Cai Z, Lin Z. 4-Mercaptobenzoic acid as a MALDI matrix for highly sensitive analysis of metals. Analyst 2021; 146:1543-1547. [PMID: 33565552 DOI: 10.1039/d1an00022e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
4-Mercaptobenzoic acid (MBA) is introduced as a matrix for laser desorption/ionization time-of-flight mass spectrometry (MS) analysis of metals, exhibiting matrix-interference-free background, greatly enhanced MS signal intensity, and excellent reproducibility. The developed method was successfully extended for the rapid screening and sensitive determination of ultratrace metals in fine particulate matter (PM2.5).
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Affiliation(s)
- Qianqian Sun
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Shasha Zhang
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Weini Huang
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Ran Wang
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Zihan Chen
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Zongwei Cai
- Partner State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, 224 Waterloo Road, Kowloon Tong, Hong Kong, SAR, P. R. China
| | - Zian Lin
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.
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4
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Zhou Q, Fülöp A, Hopf C. Recent developments of novel matrices and on-tissue chemical derivatization reagents for MALDI-MSI. Anal Bioanal Chem 2020; 413:2599-2617. [PMID: 33215311 PMCID: PMC8007514 DOI: 10.1007/s00216-020-03023-7] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 10/17/2020] [Accepted: 10/22/2020] [Indexed: 02/07/2023]
Abstract
Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) is a fast-growing technique for visualization of the spatial distribution of the small molecular and macromolecular biomolecules in tissue sections. Challenges in MALDI-MSI, such as poor sensitivity for some classes of molecules or limited specificity, for instance resulting from the presence of isobaric molecules or limited resolving power of the instrument, have encouraged the MSI scientific community to improve MALDI-MSI sample preparation workflows with innovations in chemistry. Recent developments of novel small organic MALDI matrices play a part in the improvement of image quality and the expansion of the application areas of MALDI-MSI. This includes rationally designed/synthesized as well as commercially available small organic molecules whose superior matrix properties in comparison with common matrices have only recently been discovered. Furthermore, on-tissue chemical derivatization (OTCD) processes get more focused attention, because of their advantages for localization of poorly ionizable metabolites and their‚ in several cases‚ more specific imaging of metabolites in tissue sections. This review will provide an overview about the latest developments of novel small organic matrices and on-tissue chemical derivatization reagents for MALDI-MSI. Graphical abstract ![]()
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Affiliation(s)
- Qiuqin Zhou
- Center for Mass Spectrometry and Optical Spectroscopy (CeMOS), Mannheim University of Applied Sciences, Paul-Wittsack-Str. 10, 68163, Mannheim, Germany
| | - Annabelle Fülöp
- Center for Mass Spectrometry and Optical Spectroscopy (CeMOS), Mannheim University of Applied Sciences, Paul-Wittsack-Str. 10, 68163, Mannheim, Germany
| | - Carsten Hopf
- Center for Mass Spectrometry and Optical Spectroscopy (CeMOS), Mannheim University of Applied Sciences, Paul-Wittsack-Str. 10, 68163, Mannheim, Germany.
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5
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Zahraei A, Guo G, Perwick RD, Donaldson PJ, Demarais NJ, Grey AC. Mapping glucose metabolites in the normal bovine lens: Evaluation and optimisation of a matrix-assisted laser desorption/ionisation imaging mass spectrometry method. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 56:e4666. [PMID: 33089566 DOI: 10.1002/jms.4666] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 08/02/2020] [Accepted: 09/25/2020] [Indexed: 06/11/2023]
Abstract
The spatial resolution of microdissection-based analytical methods to detect ocular lens glucose uptake, transport and metabolism are poor, whereas the multiplexing capability of fluorescence microscopy-based approaches to simultaneously detect multiple glucose metabolites is limited in comparison with mass spectrometry-based methods. To better understand lens glucose transport and metabolism, a more highly spatially resolved technique that maintains the fragile ocular lens tissue is required. In this study, a sample preparation method for matrix-assisted laser desorption/ionisation imaging mass spectrometry (MALDI IMS) analysis of ocular lens glucose uptake and metabolism has been evaluated and optimised. Matrix choice, tissue preparation and normalisation strategy were determined using negative ion mode MALDI-Fourier transform-ion cyclotron resonance MS of bovine lens tissue and validation performed using gas chromatography-MS. An internal standard was applied concurrently with N-(1-naphthyl)ethylenediamine dihydrochloride (NEDC) matrix to limit cracking of the fresh frozen lens tissue sections. MALDI IMS data were collected at a variety of spatial resolutions to detect both endogenous lens metabolites and stable isotopically labelled glucose introduced by ex vivo lens culture. Using this approach, initial steps in important metabolic processes that are linked to diabetic cataract formation were spatially mapped in the bovine lens. In the future, this method can be applied to study the dynamics of glucose uptake, transport and metabolic flux to aid in the study of diabetic lens cataract pathophysiology.
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Affiliation(s)
- Ali Zahraei
- School of Medical Sciences, University of Auckland, Auckland, New Zealand
| | - George Guo
- School of Medical Sciences, University of Auckland, Auckland, New Zealand
| | - Rebecca D Perwick
- School of Medical Sciences, University of Auckland, Auckland, New Zealand
| | - Paul J Donaldson
- School of Medical Sciences, University of Auckland, Auckland, New Zealand
| | - Nicholas J Demarais
- School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Angus C Grey
- School of Medical Sciences, University of Auckland, Auckland, New Zealand
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6
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Andersen MK, Krossa S, Høiem TS, Buchholz R, Claes BSR, Balluff B, Ellis SR, Richardsen E, Bertilsson H, Heeren RMA, Bathen TF, Karst U, Giskeødegård GF, Tessem MB. Simultaneous Detection of Zinc and Its Pathway Metabolites Using MALDI MS Imaging of Prostate Tissue. Anal Chem 2020; 92:3171-3179. [PMID: 31944670 PMCID: PMC7584334 DOI: 10.1021/acs.analchem.9b04903] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
![]()
Levels
of zinc, along with its mechanistically related metabolites citrate
and aspartate, are widely reported as reduced in prostate cancer compared
to healthy tissue and are therefore pointed out as potential cancer
biomarkers. Previously, it has only been possible to analyze zinc
and metabolites by separate detection methods. Through matrix-assisted
laser desorption/ionization mass spectrometry imaging (MSI), we were
for the first time able to demonstrate, in two different sample sets
(n = 45 and n = 4), the simultaneous
spatial detection of zinc, in the form of ZnCl3–, together with citrate, aspartate, and N-acetylaspartate
on human prostate cancer tissues. The reliability of the ZnCl3– detection was validated by total zinc
determination using laser ablation inductively coupled plasma MSI
on adjacent serial tissue sections. Zinc, citrate, and aspartate were
correlated with each other (range r = 0.46 to 0.74)
and showed a significant reduction in cancer compared to non-cancer
epithelium (p < 0.05, log2 fold change
range: −0.423 to −0.987), while no significant difference
between cancer and stroma tissue was found. Simultaneous spatial detection
of zinc and its metabolites is not only a valuable tool for analyzing
the role of zinc in prostate metabolism but might also provide a fast
and simple method to detect zinc, citrate, and aspartate levels as
a biomarker signature for prostate cancer diagnostics and prognostics.
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Affiliation(s)
- Maria K Andersen
- Department of Circulation and Medical Imaging , Norwegian University of Science and Technology (NTNU) , 7491 Trondheim , Norway
| | - Sebastian Krossa
- Department of Circulation and Medical Imaging , Norwegian University of Science and Technology (NTNU) , 7491 Trondheim , Norway
| | - Therese S Høiem
- Department of Circulation and Medical Imaging , Norwegian University of Science and Technology (NTNU) , 7491 Trondheim , Norway
| | - Rebecca Buchholz
- Institute of Inorganic and Analytical Chemistry , University of Münster , D-48149 Münster , Germany
| | - Britt S R Claes
- Maastricht MultiModal Molecular Imaging Institute (M4I) , Maastricht University , 6229 ER Maastricht , The Netherlands
| | - Benjamin Balluff
- Maastricht MultiModal Molecular Imaging Institute (M4I) , Maastricht University , 6229 ER Maastricht , The Netherlands
| | - Shane R Ellis
- Maastricht MultiModal Molecular Imaging Institute (M4I) , Maastricht University , 6229 ER Maastricht , The Netherlands
| | - Elin Richardsen
- Department of Medical Biology , The Arctic University of Norway (UIT) , 9037 Tromsø , Norway.,Department of Clinical Pathology , University Hospital of North Norway, UNN , 9019 Tromsø , Norway
| | - Helena Bertilsson
- Department of Clinical and Molecular Medicine , Norwegian University of Science and Technology (NTNU) , 7491 Trondheim , Norway.,Clinic of Surgery, St. Olavs Hospital , Trondheim University Hospital , 7030 Trondheim , Norway
| | - Ron M A Heeren
- Maastricht MultiModal Molecular Imaging Institute (M4I) , Maastricht University , 6229 ER Maastricht , The Netherlands
| | - Tone F Bathen
- Department of Circulation and Medical Imaging , Norwegian University of Science and Technology (NTNU) , 7491 Trondheim , Norway
| | - Uwe Karst
- Institute of Inorganic and Analytical Chemistry , University of Münster , D-48149 Münster , Germany
| | - Guro F Giskeødegård
- Department of Circulation and Medical Imaging , Norwegian University of Science and Technology (NTNU) , 7491 Trondheim , Norway
| | - May-Britt Tessem
- Department of Circulation and Medical Imaging , Norwegian University of Science and Technology (NTNU) , 7491 Trondheim , Norway.,Clinic of Surgery, St. Olavs Hospital , Trondheim University Hospital , 7030 Trondheim , Norway
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7
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Abdelhamid HN, Wu HF. A New Binary Matrix for Specific Detection of Mercury(II) Using Matrix-Assisted Laser Desorption Ionization Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:2617-2622. [PMID: 31659719 DOI: 10.1007/s13361-019-02324-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 06/29/2019] [Accepted: 08/10/2019] [Indexed: 06/10/2023]
Abstract
The development of simple, low-cost, and specific detection method for mercury (Hg(II)) ions in aqueous media using matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) is a challenge due to matrix interferences and acidity that destroy weak interactions. Herein, a new binary matrix consists of mefenamic acid, and thymine (T) is applied for simple and specific detection of Hg(II) in aqueous solution and blood sample. Mass spectra show metal-to-ligand ratio of 1:2 (Hg(II):T) in which Hg(II) ions are bound to two T molecules and two water molecules, i.e., [Hg(T)2(H2O)2]. The method is simple and fast, and requires cheap reagents. In addition, the spectra show extremely specific signals for Hg(II) ions and insignificant signals in case of other competing metal ions. The concept of our protocol can be applied for other metals. The new matrix may be used for the analysis of small molecules with minimal interferences peaks.
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Affiliation(s)
- Hani Nasser Abdelhamid
- Department of Chemistry, National Sun Yat-Sen University, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan.
- Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan.
- Advanced Multifunctional Materials Laboratory, Department of Chemistry, Assiut University, Assiut, 71515, Egypt.
| | - Hui-Fen Wu
- Department of Chemistry, National Sun Yat-Sen University, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan.
- Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan.
- Advanced Multifunctional Materials Laboratory, Department of Chemistry, Assiut University, Assiut, 71515, Egypt.
- School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, 100, Shih-Chuan 1st Road, Kaohsiung, 80708, Taiwan.
- Doctoral Degree Program in Marine Biotechnology, National Sun Yat-Sen University, 70, Lien-Hai Road, Kaohsiung, 80424, Taiwan.
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8
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Demarais NJ, Donaldson PJ, Grey AC. Age-related spatial differences of human lens UV filters revealed by negative ion mode MALDI imaging mass spectrometry. Exp Eye Res 2019; 184:146-151. [PMID: 31004573 DOI: 10.1016/j.exer.2019.04.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 04/08/2019] [Accepted: 04/16/2019] [Indexed: 01/01/2023]
Abstract
Tryptophan-derived UV filters are predominantly found in the lenses of primates and humans. While protective against UV radiation, aging alters the complement and spatial distributions of human lens UV filters, and a role for UV filters has been suggested in age-related cataract formation. To establish how the spatial distributions of UV filters change in normal human lens aging, matrix assisted laser desorption/ionisation-imaging mass spectrometry (MALDI-IMS) was utilised to map the locations and relative abundance of multiple UV filters simultaneously. Frozen human lenses were cryosectioned axially, and the 20 μm-thick sections coated with MALDI matrix via robotic sprayer and analysed using negative ion mode MALDI-Fourier transform-ion cyclotron resonance MS. While signal for many UV filters was detected throughout the lenses, signal intensity was generally highest in the central (embryonic) nucleus and decreased uniformly in outer (foetal, juvenile, adult) nuclear and cortical regions, and many UV filter signals declined with age. In contrast, two antioxidant-conjugated UV filters (Cys-3-OHKG and GSH-3-OHKG) were restricted to the lens nucleus and their relative signal increased with increasing lens age. The enhanced spatial resolution of MALDI-IMS over manual trephine dissection techniques and its multiplex capability allowed the spatial relationships between lens UV filters to be established and explored in relation to aging. Together these results confirmed that the complement of UV filters in each lens is dynamic and undergoes significant age-related changes. In the future, this information could be used to compare with other lens biomolecule changes to better understand the lens aging process and age-related cataract formation.
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Affiliation(s)
- Nicholas J Demarais
- School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Paul J Donaldson
- Department of Physiology, School of Medical Sciences, University of Auckland, Auckland, New Zealand
| | - Angus C Grey
- Department of Physiology, School of Medical Sciences, University of Auckland, Auckland, New Zealand.
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9
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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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10
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Garcia MM, Wrobel K, Segovia ASR, Barrientos EY, Escobosa ARC, Serrano O, Aguilar FJA, Wrobel K. Application of MALDI-TOFMS Combined with Partial Least Square Regression for the Determination of Mercury and Copper in Canned Tuna, Using Dithizone as the Complexing Agent and Ag(I) as Internal Standard. FOOD ANAL METHOD 2018. [DOI: 10.1007/s12161-018-1272-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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11
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O'Rourke MB, Djordjevic SP, Padula MP. The quest for improved reproducibility in MALDI mass spectrometry. MASS SPECTROMETRY REVIEWS 2018; 37:217-228. [PMID: 27420733 DOI: 10.1002/mas.21515] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/19/2016] [Accepted: 06/16/2016] [Indexed: 05/18/2023]
Abstract
Reproducibility has been one of the biggest hurdles faced when attempting to develop quantitative protocols for MALDI mass spectrometry. The heterogeneous nature of sample recrystallization has made automated sample acquisition somewhat "hit and miss" with manual intervention needed to ensure that all sample spots have been analyzed. In this review, we explore the last 30 years of literature and anecdotal evidence that has attempted to address and improve reproducibility in MALDI MS. Though many methods have been attempted, we have discovered a significant publication history surrounding the use of nitrocellulose as a substrate to improve homogeneity of crystal formation and therefore reproducibility. We therefore propose that this is the most promising avenue of research for developing a comprehensive and universal preparation protocol for quantitative MALDI MS analysis. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 37:217-228, 2018.
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Affiliation(s)
- Matthew B O'Rourke
- Proteomics Core Facility, University of Technology Sydney, Cnr Harris and Thomas St, Ultimo, New South Wales, 2007, Australia
| | - Steven P Djordjevic
- The iThree Institute, University of Technology Sydney, Cnr Harris and Thomas St, Ultimo, New South Wales, 2007, Australia
| | - Matthew P Padula
- Proteomics Core Facility, University of Technology Sydney, Cnr Harris and Thomas St, Ultimo, New South Wales, 2007, Australia
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Hou J, Chen S, Cao C, Liu H, Xiong C, Zhang N, He Q, Song W, Nie Z. Application of flowerlike MgO for highly sensitive determination of lead via matrix-assisted laser desorption/ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30 Suppl 1:208-216. [PMID: 27539440 DOI: 10.1002/rcm.7637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
RATIONALE Matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) is a high-throughput method to achieve fast and accurate identification of lead (Pb) exposure, but is seldom used because of low ionization efficiency and insufficient sensitivity. Nanomaterials applied in MS are a promising technique to overcome the obstacles of MALDI. METHODS Flowerlike MgO nanostructures are applied for highly sensitive lead profiling in real samples. They can be used in two ways: (a) MgO is mixed with N-naphthylethylenediamine dihydrochloride (NEDC) as a novel matrix MgO/NEDC; (b) MgO is applied as an absorbent to enrich Pb ions in very dilute solution. RESULTS The signal intensities of lead by MgO/NEDC were ten times higher than the NEDC matrix. It also shows superior anti-interference ability when analyzing 10 μmol/L Pb ions in the presence of organic substances or interfering metal ions. By applying MgO as adsorbent, the LOD of lead before enrichment is 1 nmol/L. Blood lead test can be achieved using this enrichment process. Besides, MgO can play the role of internal standard to achieve quantitative analysis. CONCLUSIONS Flowerlike MgO nanostructures were applied for highly sensitive lead profiling in real samples. The method is helpful to prevent Pb contamination in a wide range. Further, the combination of MgO with MALDI MS could inspire more nanomaterials being applied in highly sensitive profiling of pollutants. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Jian Hou
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Suming Chen
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Changyan Cao
- Beijing National Laboratory for Molecular Science, Laboratory of Molecular Nanostructures and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Huihui Liu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Caiqiao Xiong
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Ning Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Qing He
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Weiguo Song
- Beijing National Laboratory for Molecular Science, Laboratory of Molecular Nanostructures and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Zongxiu Nie
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
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