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Direct analysis in real time mass spectrometry (DART-MS) of discrete sample areas without heat damage

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Abstract

Direct analysis in real time mass spectrometry (DART-MS) analyzes intact object surfaces by exposing them to a stream of heated gas. The continuous gas flow prevents discrete sampling of a central surface area, and the high temperatures cause visible discoloration and deformation of heat-sensitive materials. A time-controlled mechanical shutter was installed in front of a DART ion source mounted at an angle to the ion inlet for discrete sample surface analyses. Interior areas on stationary surfaces were studied without exposing the surrounding material of the greater object. The temperature exposure profile and spatial dimensions of areas impacted by the heated ionization gas were characterized to optimize DART positioning. Physical effects from DART of thermally sensitive photographs were recorded at various exposure times and temperatures, and high resolution mass spectra were acquired without causing visible or microscopic damage to photograph images. The shutter afforded 0.25 s DART-MS analysis time that was as qualitatively informative as exposures for tens of seconds.

Graphical abstract: Direct analysis in real time mass spectrometry (DART-MS) of discrete sample areas without heat damage

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Publication details

The article was received on 28 Dec 2017, accepted on 06 Feb 2018 and first published on 13 Feb 2018


Article type: Paper
DOI: 10.1039/C7AY02987J
Citation: Anal. Methods, 2018, Advance Article
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    Direct analysis in real time mass spectrometry (DART-MS) of discrete sample areas without heat damage

    G. A. Newsome, I. Kayama and S. A. Brogdon-Grantham, Anal. Methods, 2018, Advance Article , DOI: 10.1039/C7AY02987J

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