Journal of the American Society for Mass Spectrometry最新文献_第9页

Spatial Distribution of Brain PET Tracers by MALDI Imaging. MALDI成像对脑PET示踪剂空间分布的影响。

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-03-12 DOI: 10.1021/jasms.4c00307

Isabeau Vermeulen, Michiel Vandenbosch, Delphine Viot, Joel Mercier, Diego Asensio-Wandosell Cabañas, Pilar Martinez-Martinez, Patrick Barton, Ron M A Heeren, Berta Cillero-Pastor

{"title":"Spatial Distribution of Brain PET Tracers by MALDI Imaging.","authors":"Isabeau Vermeulen, Michiel Vandenbosch, Delphine Viot, Joel Mercier, Diego Asensio-Wandosell Cabañas, Pilar Martinez-Martinez, Patrick Barton, Ron M A Heeren, Berta Cillero-Pastor","doi":"10.1021/jasms.4c00307","DOIUrl":"10.1021/jasms.4c00307","url":null,"abstract":"Evaluating tissue distribution of Positron Emission Tomography (PET) tracers during their development conventionally involves autoradiography techniques, where radioactive compounds are used for ex vivo visualization and quantification in tissues during preclinical development stages. Mass Spectrometry Imaging (MSI) offers a potential alternative, providing spatial information without the need for radioactivity with a similar spatial resolution. This study aimed to optimize a MSI sample preparation protocol for assessing PET tracer candidates ex vivo with a focus on two compounds: UCB-J and UCB2400. We tested different matrices and introduced washing steps to improve PET tracer detection. Tissue homogenates were prepared to construct calibration curves for quantification. The incorporation of a washing step into the MSI sample preparation protocol enhanced the signal of both PET tracers. Our findings highlight MSI's potential as a cost-effective and efficient method for the evaluation of PET tracer distribution. The optimized approach offered here can provide a protocol that enhances the signal and minimizes ion suppression effect, which can be valuable for future evaluation of PET tracers in MSI studies.","PeriodicalId":672,"journal":{"name":"Journal of the American Society for Mass Spectrometry","volume":" ","pages":"688-698"},"PeriodicalIF":3.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969657/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pneumatically Assisted Microfluidic Probe for Enhanced Mass Spectrometry Imaging Performance. 用于增强质谱成像性能的气动辅助微流体探针。

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-03-21 DOI: 10.1021/jasms.5c00011

Li-Xue Jiang, Julia Laskin

引用次数: 0

Glycosaminoglycan Mass Spectrometry Imaging by Infrared Matrix-Assisted Laser Desorption Electrospray Ionization. 红外基质辅助激光解吸电喷雾电离的糖胺聚糖质谱成像。

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-03-03 DOI: 10.1021/jasms.4c00435

Tana V Palomino, David C Muddiman

引用次数: 0

Faces of Mass Spectrometry/Amanda Patrick. 质谱分析的面孔/阿曼达·帕特里克。

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-02-25 DOI: 10.1021/jasms.5c00042

Anne Brenner, J D Brookbank

引用次数: 0

Headspace Injection Method for Intermittent Sampling and Profiling Analyses of Volatile Organic Compounds Using Dielectric Barrier Discharge Ionization (DBDI). 介质阻挡放电电离（DBDI）间歇取样和分析挥发性有机化合物的顶空注射方法。

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-03-10 DOI: 10.1021/jasms.4c00475

Daniel Heffernan, Frederik Oleinek, Ayla Schueler, Paak Wai Lau, Jürgen Kudermann, Alina Meindl, Mathias O Senge, Nicole Strittmatter

{"title":"Headspace Injection Method for Intermittent Sampling and Profiling Analyses of Volatile Organic Compounds Using Dielectric Barrier Discharge Ionization (DBDI).","authors":"Daniel Heffernan, Frederik Oleinek, Ayla Schueler, Paak Wai Lau, Jürgen Kudermann, Alina Meindl, Mathias O Senge, Nicole Strittmatter","doi":"10.1021/jasms.4c00475","DOIUrl":"10.1021/jasms.4c00475","url":null,"abstract":"A direct headspace injection method is presented and optimized for the analysis of volatile organic compounds (VOCs) using dielectric barrier discharge ionization-mass spectrometry (DBDI-MS), incorporating an intermediate vial in which the sample headspace is injected. The setup is built of commonly available, cheap consumable parts and easily enables the incorporation of different gases for generating different ionization atmospheres. The method can be fully automated by using standard GC autosamplers, and its rapid analysis time is suitable for high-throughput applications. We show that this method is suitable for both profiling analysis of complex samples such as biofluids and quantitative measurements for real-time reaction monitoring. Our optimized method demonstrated improved reproducibility and sensitivity, with detection limits for compounds tested in the high nanomolar to the low micromolar range, depending on the compound. Key parameters for method optimization were identified such as sample vial volume, headspace-to-liquid ratio, incubation temperature, and equilibration time. These settings were systematically evaluated to maximize the signal intensity and improve repeatability between measurements. Two use cases are demonstrated: (i) quantitative measurement of ethanol production by a metal-organic framework from CO2 and (ii) profiling of biofluids following the consumption of asparagus.","PeriodicalId":672,"journal":{"name":"Journal of the American Society for Mass Spectrometry","volume":" ","pages":"801-810"},"PeriodicalIF":3.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969650/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143596010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution of Mass Spectrometers for High m/z Biological Ion Formation, Transmission, Analysis and Detection: A Personal Perspective. 高m/z生物离子形成、传输、分析和检测的质谱仪的发展：个人观点。

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-03-05 DOI: 10.1021/jasms.4c00348

Iain D G Campuzano, Joseph A Loo

{"title":"Evolution of Mass Spectrometers for High m/z Biological Ion Formation, Transmission, Analysis and Detection: A Personal Perspective.","authors":"Iain D G Campuzano, Joseph A Loo","doi":"10.1021/jasms.4c00348","DOIUrl":"10.1021/jasms.4c00348","url":null,"abstract":"Mass spectrometry (MS) has become an essential tool in virtually all academic, pharmaceutical, and biopharmaceutical analytical laboratories. The specialized and bespoke area of MS research and application of high m/z ion (>m/z 6000 and high mass, >150 kDa) formation, transmission, analysis, and detection is a relatively new area of focus for MS that has seen dramatic acceleration in interest over the last two decades. Herein we delve into this exciting aspect of MS, discussing how MS instrumentation has been refined and evolved for native-MS analysis. We cover the early groundbreaking experiments showing high m/z ion formation, transmission, and preservation of protein structure in the gas phase. Additionally, we discuss specific instrument optimizations and modifications that have advanced high m/z ion generation, transmission, analysis, and detection, contributing to the research area known as gas-phase structural biology. Native-MS sample introduction methods, emerging technologies, and future perspectives are also examined. Finally, we share personal opinions, observations, and experiences that are new to the community or previously unpublished.","PeriodicalId":672,"journal":{"name":"Journal of the American Society for Mass Spectrometry","volume":" ","pages":"632-652"},"PeriodicalIF":3.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143565631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetic Method Coupled with Thermal-Assisted Paper Spray Ionization Mass Spectrometry for Direct Determination of Enantiomeric Excess of Multiple d/l-Amino Acids in Functional Foods. 动力学法与热辅助纸喷雾电离质谱联用直接测定功能食品中多种d/l-氨基酸对映体过量。

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-03-13 DOI: 10.1021/jasms.5c00050

Wen-Bo Gao, Shu-Ting Xu, Yong-Jie Yan, Cheng Yang, Xiu-Ping Yan

{"title":"Kinetic Method Coupled with Thermal-Assisted Paper Spray Ionization Mass Spectrometry for Direct Determination of Enantiomeric Excess of Multiple d/l-Amino Acids in Functional Foods.","authors":"Wen-Bo Gao, Shu-Ting Xu, Yong-Jie Yan, Cheng Yang, Xiu-Ping Yan","doi":"10.1021/jasms.5c00050","DOIUrl":"10.1021/jasms.5c00050","url":null,"abstract":"Amino acids are commonly used as nutritional fortification substances in functional foods, and their chiral configuration is an important determinant of food function. Rapid chiral screening methods are urgently needed in food analysis but are limited by the long-time chiral separation and matrix interference. In this study, we show a kinetic method coupled to thermal-assisted paper spray ionization mass spectrometry for direct determination of enantiomeric excess (ee) of multiple d/l-amino acids in complex food matrixes without sample pretreatment. 3-(2-Naphthyl)-l-alanine was selected as a new chiral reference ligand for the kinetic method to achieve efficient chiral differentiation (discrimination degree is 8.7 for d/l-phenylalanine and 10.2 for d/l-tyrosine). An additional thermal-auxiliary device was developed for paper spray ionization mass spectrometry to facilitate the enantiomeric purity determination. The developed method allowed a rapid simultaneous enantiomeric purity determination of multiple chiral amino acids (d/l-phenylalanine and d/l-tyrosine) within 30 s. Good linearities were achieved for the quantitation of ee (R2 = 0.9996 for phenylalanine and 0.9995 for tyrosine) with unknown amino acid concentrations ranging from 10 μM to 600 μM. The developed method was successfully applied for the enantiomeric purity determination of multiple chiral amino acids in functional capsules and beverages and showed great potential for efficient enantiomer-related food safety screening and nutrition analysis.","PeriodicalId":672,"journal":{"name":"Journal of the American Society for Mass Spectrometry","volume":" ","pages":"906-913"},"PeriodicalIF":3.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Infrared Matrix-Assisted Laser Desorption Electrospray Ionization (IR-MALDESI) Mass Spectrometry Imaging of Per- and Polyfluoroalkyl Substances (PFAS) in Stabilized Soil Cores. 稳定土核中全氟烷基和多氟烷基物质（PFAS）的红外基质辅助激光解吸电喷雾电离（IR-MALDESI）质谱成像

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-03-18 DOI: 10.1021/jasms.4c00428

Theresa Guillette, Whitney Stutts, Andrew Baumeister, David Liles, Theresa Olechiw, Johnsie Lang

{"title":"Infrared Matrix-Assisted Laser Desorption Electrospray Ionization (IR-MALDESI) Mass Spectrometry Imaging of Per- and Polyfluoroalkyl Substances (PFAS) in Stabilized Soil Cores.","authors":"Theresa Guillette, Whitney Stutts, Andrew Baumeister, David Liles, Theresa Olechiw, Johnsie Lang","doi":"10.1021/jasms.4c00428","DOIUrl":"10.1021/jasms.4c00428","url":null,"abstract":"Infrared matrix-assisted laser desorption electrospray ionization (IR-MALDESI) was coupled with high-resolution accurate-mass-mass spectrometry (HRAM-MS) to image perfluoroalkyl and polyfluoroalkyl substances (PFAS) in stabilized soil cores. Previous field-scale research demonstrated a substantial decrease in the leachability of PFAS following the application of in situ stabilization and solidification (S/S) in an aqueous film-forming foam (AFFF) source zone. While this previous study empirically confirmed the effectiveness of S/S, there was no definitive identification of the operative retention mechanisms. Therefore, the objective of this follow-on study was to (1) develop a high-resolution mass spectrometry-based imaging technique for PFAS on stabilized and background control soil cores and (2) determine if chemical characteristics of the amendments were associated spatially with the PFAS distribution within the soil cores at a micrometer scale. Intact frozen soil cores were imaged in negative ion mode, targeted and suspect screening analyses were conducted, features were identified using suspect lists, and analytes were presented as raw abundances matched against several databases. IR-MALDESI imaging results confirmed the colocation of PFOS and PFHxS with non-PFAS chemical features (e.g., mono- and diglycerides) associated with treatments including amendments, which suggests chemical fixation as a mechanism of stabilization for PFAS in stabilized soil cores.","PeriodicalId":672,"journal":{"name":"Journal of the American Society for Mass Spectrometry","volume":" ","pages":"653-657"},"PeriodicalIF":3.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143646871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ligand Conformational and Metal Coordination Isomers in Complexes of Metal Ions and Cyclic Depsipeptides. 金属离子和环沉积肽配合物中的配体构象和金属配位异构体。

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 Epub Date: 2025-03-11 DOI: 10.1021/jasms.5c00010

Emmanuel Nkyaagye, Hernando J Olivos, Thanh D Do

{"title":"Ligand Conformational and Metal Coordination Isomers in Complexes of Metal Ions and Cyclic Depsipeptides.","authors":"Emmanuel Nkyaagye, Hernando J Olivos, Thanh D Do","doi":"10.1021/jasms.5c00010","DOIUrl":"10.1021/jasms.5c00010","url":null,"abstract":"A critical challenge in the structural characterization of metal complexes in apolar environments is distinguishing transient structural isomers within an ensemble of lower- and higher-order assemblies. These structural variations arise from subtle changes in ligand architecture and metal coordination chemistry, which are often difficult to deconvolute. Here, we utilize ion activation in both drift-tube and cyclic ion mobility spectrometry-mass spectrometry (IMS-MS) to resolve ligand conformational isomerism and metal coordination isomerism in metal sandwich complexes of cyclic depsipeptide ligands known for selective metal ion transport. Our approach reveals that isomerism driven by ligand structural rearrangements exhibits low energy barriers, allowing their interconversion to be captured on the IMS-MS time scale. In contrast, isomers involving distinct metal coordination states are characterized by higher energy barriers, precluding rapid interconversion. These findings establish a direct correlation between isomer distributions and selective metal binding and transport, providing mechanistic insights into the biological functions of cyclic depsipeptides. This work underscores the utility of IMS-MS for disentangling complex structural dynamics in biologically relevant metal-peptide ligand systems.","PeriodicalId":672,"journal":{"name":"Journal of the American Society for Mass Spectrometry","volume":" ","pages":"873-882"},"PeriodicalIF":3.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143603337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probing the Interactions of Cytochrome c with Anionic Phospholipid Nanodiscs Using Millisecond Hydrogen–Deuterium Exchange Mass Spectrometry 利用毫秒氢-氘交换质谱法探测细胞色素c与阴离子磷脂纳米盘的相互作用

IF 3.1 2区化学

Journal of the American Society for Mass Spectrometry Pub Date : 2025-04-02 DOI: 10.1021/jasms.4c0047810.1021/jasms.4c00478

Vimanda Chow, Cristina Lento and Derek J. Wilson*,

{"title":"Probing the Interactions of Cytochrome c with Anionic Phospholipid Nanodiscs Using Millisecond Hydrogen–Deuterium Exchange Mass Spectrometry","authors":"Vimanda Chow, Cristina Lento and Derek J. Wilson*, ","doi":"10.1021/jasms.4c0047810.1021/jasms.4c00478","DOIUrl":"https://doi.org/10.1021/jasms.4c00478https://doi.org/10.1021/jasms.4c00478","url":null,"abstract":"The interplay between the anionic phospholipid cardiolipin (CL) and cytochrome c (cyt c) holds significance in the early stages of apoptosis. Despite identification of up to four potential sites of interaction between cytochrome c and cardiolipin bearing membranes, the exact mode of interaction remains unexplained, especially given that some of the putative binding surfaces are mutually exclusive. In this study, we utilize millisecond time-resolved electrospray ionization hydrogen–deuterium exchange mass spectrometry (TRESI-HDX-MS) to investigate conformational and dynamic changes in cytochrome c in the presence of various phospholipids (DMPC, POPG, and CL) incorporated into nanodiscs. We observe that, among the proposed binding sites, the adjacent “L”- and “A”-sites exhibited a decrease in deuterium exchange, while the “N” site remained unperturbed, suggesting a specific orientation of cytochrome c with respect to cell membranes upon binding. We also demonstrate that negatively charged phospholipids with physical differences (i.e., POPG and CL) exhibit essentially the same interaction with cytochrome c, supporting the utility of POPG nanodiscs as a model for cytochrome c–membrane interactions.","PeriodicalId":672,"journal":{"name":"Journal of the American Society for Mass Spectrometry","volume":"36 5","pages":"1052–1059 1052–1059"},"PeriodicalIF":3.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/jasms.4c00478","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0