|
1
|
Otsuka Y, Ote N, Sun M, Shimma S, Urakawa O, Yamaguchi S, Kudo T, Toyoda M. Solvent effects of N, N-dimethylformamide and methanol on mass spectrometry imaging by tapping-mode scanning probe electrospray ionization. Analyst 2023; 148:1275-1284. [PMID: 36810589 DOI: 10.1039/d2an01953a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Mass spectrometry imaging (MSI) is an effective technique for visualizing the distribution of lipids in tissues. The direct extraction-ionization methods using minute volumes of solvent for local components have the advantage of rapid measurement without any sample pretreatment. For effective MSI of tissues, it is necessary to understand the effect of solvent physicochemical properties on ion images. In this study, we report solvent effects on the lipid imaging of mouse brain tissue by tapping-mode scanning probe electrospray ionization (t-SPESI) which is capable of extraction-ionization using sub-pL solvents. To precisely measure lipid ions, we developed a measurement system incorporating a quadrupole-time-of-flight mass spectrometer. The differences in signal intensity and spatial resolution of lipid ion images were investigated using N,N-dimethylformamide (non-protic polar solvent), methanol (protic polar solvent) and their mixture. The mixed solvent was suitable for the protonation of lipids, and it provided high spatial resolution MSI. Results indicate that the mixed solvent improves the extractant transfer efficiency and minimizes charged droplets from an electrospray. The solvent selectivity study revealed the importance of solvent selection based on physicochemical properties for the advancement of MSI by t-SPESI.
Collapse
Affiliation(s)
- Yoichi Otsuka
- Department of Physics, Graduate School of Science, Osaka University, Japan. .,JST, PREST, Japan.,Forefront Research Center, Graduate School of Science, Osaka University, Japan
| | - Nijiho Ote
- Department of Biological Sciences, School of Science, Osaka Universit, Japan
| | - Mengze Sun
- Department of Physics, Graduate School of Science, Osaka University, Japan.
| | - Shuichi Shimma
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Japan
| | - Osamu Urakawa
- Department of Chemistry, Graduate School of Science, Osaka University, Japan
| | | | | | - Michisato Toyoda
- Department of Physics, Graduate School of Science, Osaka University, Japan. .,Forefront Research Center, Graduate School of Science, Osaka University, Japan
| |
Collapse
|
|
2
|
Krestyaninov MA, Kiselev MG, Safonova LP. Quantum-mechanical analysis of the structure of phosphoric acid complexes with methyl methacrylate and methyl trimethylacetate. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2013. [DOI: 10.1134/s0036024413110149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
|
3
|
Shainyan BA, Chipanina NN, Oznobikhina LP, Chernysheva GN, Rozentsveig IB. Hydrogen-bonded complexes of sulfonamides and thioamides with DMF: FT-IR and DFT study, NBO analysis. J PHYS ORG CHEM 2013. [DOI: 10.1002/poc.3094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- B. A. Shainyan
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
| | - N. N. Chipanina
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
| | - L. P. Oznobikhina
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
| | - G. N. Chernysheva
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
| | - I. B. Rozentsveig
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
| |
Collapse
|
|
4
|
Stangret J, Kamieńska-Piotrowicz E, Szymańska-Cybulska J. Analysis of spectral data by complementary methods. Inspection of the molecular complex in N,N-dimethylformamide-methanol mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:3043-50. [PMID: 16165049 DOI: 10.1016/j.saa.2004.11.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2004] [Accepted: 11/16/2004] [Indexed: 05/04/2023]
Abstract
FT-IR spectra of N,N-dimethylformamide (DMF)-methanol (MeOH) mixtures have been measured in the range of 4000-950 cm(-1). The data have been analyzed using the difference spectra method and factor analysis. The usefulness of the methods for recognizing the hydrogen bonds in the mixtures has been critically examined. It has been shown that 1:1 intermolecular complex existing in the whole range of the mixture composition is modified by interactions with environment. The structure of different forms of the complex depending on the solvent composition has been shown. Weak CH...O hydrogen bonds have been postulated for explanation of the spectra.
Collapse
Affiliation(s)
- Janusz Stangret
- Department of Physical Chemistry, Gdańsk University of Technology, ul. Narutowicza 11/12, PL-80-952 Gdańsk, Poland.
| | | | | |
Collapse
|