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RamalloGuevara C, Paulssen D, Popova AA, Hopf C, Levkin PA. Fast Nanoliter-Scale Cell Assays Using Droplet Microarray-Mass Spectrometry Imaging. Adv Biol (Weinh) 2021; 5:e2000279. [PMID: 33729695 DOI: 10.1002/adbi.202000279] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 12/23/2020] [Indexed: 12/21/2022]
Abstract
In pharmaceutical research and development, cell-based assays are primarily used with readout that rely on fluorescence-based and other label-dependent techniques for analysis of different cellular processes. Superhydrophobic-hydrophilic droplet microarrays (DMA) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) have recently emerged as key technologies for miniaturized high-throughput cell assays and for label-free molecular high-content drug profiling, respectively. Here, nanoliter-scale cell assays are integrated on DMAs with MALDI-MS imaging (MALDI-MSI) approaches to a droplet microarray-mass spectrometry imaging (DMA-MSI) platform. Using A549 lung cancer cells, concentration-response profiling of a pharmaceutical compound, the fatty acid synthase inhibitor GSK2194069, are demonstrated. Direct cell culture on DMAs enables combination of microscopy and high speed, high molecular content analysis using MALDI-MSI. Miniaturization of array spots down to 0.5 mm confining 40 nL droplets allows for MALDI imaging analysis of as few as ten cells per spot. Partial automation ensures a fast sample preparation workflow. Taken together, the integrated DMA-MSI platform that combines MALDI-MSI, as a label-free analytical readout, with the miniaturized droplet microarray platform is a valuable complement to high throughput cell-based assays technologies.
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Affiliation(s)
- Carina RamalloGuevara
- Center for Mass Spectrometry and Optical Spectroscopy (CeMOS), Mannheim University of Applied Sciences, Paul-Wittsack Str. 10, Mannheim, 68163, Germany
| | - Dorothea Paulssen
- Karlsruhe Institute of Technology (KIT), Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Anna A Popova
- Karlsruhe Institute of Technology (KIT), Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Carsten Hopf
- Center for Mass Spectrometry and Optical Spectroscopy (CeMOS), Mannheim University of Applied Sciences, Paul-Wittsack Str. 10, Mannheim, 68163, Germany
| | - Pavel A Levkin
- Karlsruhe Institute of Technology (KIT), Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
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Qi Y, Hu X, Yang X, Jia S, Zhong H. Competing Deprotonation and Electron Capture Dissociation in MALDI Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:322-329. [PMID: 33200938 DOI: 10.1021/jasms.0c00344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A protonation/deprotonation mechanism has been established for the interpretation of ions in MALDI. We show herein that negative ions can be generated in different ways. Molecules with different electron affinities have been spotted on surfaces of TiO2, ZnO, and a stainless steel plate for the investigation of electron capture dissociation in comparison with photo- or thermal-induced deprotonation upon irradiation of the third harmonic of Nd3+:YAG (355 nm) laser pulses. Detection of C60•- and Fe (II) (porph•-) radical anions unambiguously demonstrates the electron-transfer process and the exothermic capture of electrons. Radical anions of fatty acids were difficult to observe because of electron-directed ultrafast homolytic cleavage of O-H bonds unless there is a conjugated system as that in C60 and porphyrin for the delocalization and stabilization of acquired changes. The surface basicity of substrate materials was found to determine the competition of the electron-capture dissociation with deprotonation processes. Multiple electron transfers to pyrrole, -COOH, and Fe2+ of the heme were observed on TiO2 and the stainless steel plate but not on ZnO. When the heme was deprotonated by proton sponge 1,8-bis(dimethylamino)naphthalene, the occurrence of electron transfer on TiO2 was also not observed. It is proposed that negative charges of deprotonated ions prevent electron transfer due to the repulsive force. When both deprotonation and electron transfer are inhibited, adsorbed fatty acids on TiO2 undergo dehydration reactions to form titanium esters. In contrast, ZnO generates gaseous micelles composed of positive metal ions and negative fatty acid ions through either deprotonation or electron-capture dissociation.
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Affiliation(s)
- Yinghua Qi
- Laboratory of Mass Spectrometry, College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, P.R. China
- Key Laboratory of Pesticides and Chemical Biology, Ministry of Education, Wuhan, Hubei 430079, P.R. China
| | - Xuewen Hu
- Laboratory of Mass Spectrometry, College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, P.R. China
- Key Laboratory of Pesticides and Chemical Biology, Ministry of Education, Wuhan, Hubei 430079, P.R. China
| | - Xiaojie Yang
- Laboratory of Mass Spectrometry, College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, P.R. China
- Key Laboratory of Pesticides and Chemical Biology, Ministry of Education, Wuhan, Hubei 430079, P.R. China
| | - Shanshan Jia
- Laboratory of Mass Spectrometry, College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, P.R. China
- Key Laboratory of Pesticides and Chemical Biology, Ministry of Education, Wuhan, Hubei 430079, P.R. China
| | - Hongying Zhong
- Laboratory of Mass Spectrometry, College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, P.R. China
- Key Laboratory of Pesticides and Chemical Biology, Ministry of Education, Wuhan, Hubei 430079, P.R. China
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Yin Z, Xu Z, Liu R, Hang W, Huang B. Microtrace Analysis of Rare Earth Element Residues in Femtogram Quantities by Laser Desorption and Laser Postionization Mass Spectrometry. Anal Chem 2017; 89:7455-7461. [DOI: 10.1021/acs.analchem.7b01033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Zhibin Yin
- Department of Chemistry and the MOE Key Lab of Spectrochemical Analysis
and Instrumentation, College of Chemistry and Chemical Engineering, and ‡State Key Laboratory
of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, China
| | - Zhouyi Xu
- Department of Chemistry and the MOE Key Lab of Spectrochemical Analysis
and Instrumentation, College of Chemistry and Chemical Engineering, and ‡State Key Laboratory
of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, China
| | - Rong Liu
- Department of Chemistry and the MOE Key Lab of Spectrochemical Analysis
and Instrumentation, College of Chemistry and Chemical Engineering, and ‡State Key Laboratory
of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, China
| | - Wei Hang
- Department of Chemistry and the MOE Key Lab of Spectrochemical Analysis
and Instrumentation, College of Chemistry and Chemical Engineering, and ‡State Key Laboratory
of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, China
| | - Benli Huang
- Department of Chemistry and the MOE Key Lab of Spectrochemical Analysis
and Instrumentation, College of Chemistry and Chemical Engineering, and ‡State Key Laboratory
of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, China
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Affiliation(s)
- Patricia M Peacock
- First State IR, LLC , 118 Susan Drive, Hockessin, Delaware 19707, United States
| | - Wen-Jing Zhang
- Department of Chemistry, Wayne State University , 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Sarah Trimpin
- Department of Chemistry, Wayne State University , 5101 Cass Avenue, Detroit, Michigan 48202, United States
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