Distortion of ion structures by field asymmetric waveform ion mobility spectrometry.

Distortion of ion structures by field asymmetric waveform ion mobility spectrometry. Research Abstract Details 

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Distortion of ion structures by field asymmetric waveform ion mobility spectrometry. Abstract Text:

Alexandre A Shvartsburg,Fumin Li,Keqi Tang,Richard D Smith,

Field asymmetric waveform ion mobility spectrometry (FAIMS) is emerging as a major analytical tool, especially in conjunction with mass spectrometry (MS), conventional ion mobility spectrometry (IMS), or both. In particular, FAIMS is used to separate protein or peptide conformers prior to characterization by IMS, MS/MS, or H/D exchange. High electric fields in FAIMS induce ion heating, previously estimated at <10 degrees C on average and believed too weak to affect ion geometries. Here we use a FAIMS/IMS/MS system to compare the IMS spectra for ESI-generated ubiquitin ions that have and have not passed FAIMS and find that some unfolding occurs for most charge states. These data and their comparison with the reported protein unfolding in a Paul trap imply that at least some structural transitions observed in FAIMS, or previously in an ion trap, are not spontaneous. The observed unfolding is similar to that produced by heating of approximately 50 degrees C above room temperature, consistent with the calculated heating of ions at FAIMS waveform peaks. Hence, the ion isomerization in FAIMS likely proceeds in steps during the "hot" periods, especially right after entering the device. The process distorts ion geometries and causes ion losses by a "self-cleaning" mechanism and thus should be suppressed as much as possible. We propose achieving that via cooling FAIMS by the amount of ion heating; in most cases, cooling by approximately 75 degrees C should suffice.

Distortion of ion structures by field asymmetric waveform ion mobility spectrometry. Publishing Authors By Initials

AA Shvartsburg,F Li,K Tang,RD Smith,

For similar proteins: ubiquitins: ubiquitin research abstracts see: proteins: ubiquitins: ubiquitin research

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Distortion of ion structures by field asymmetric waveform ion mobility spectrometry. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Analytical chemistry

VOLUME: 79

Page Numbers: 1523-8

Journal Abbreviation: Anal. Chem.

ISSN: 0003-2700

DAY: 15

MONTH: Feb

YEAR: 2007

Distortion of ion structures by field asymmetric waveform ion mobility spectrometry. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 370536

Distortion of ion structures by field asymmetric waveform ion mobility spectrometry. Keywords Mesh Terms:

KEYWORDS: Ubiquitin

MESH TERMS: analysis

Chemical & Substance for Abstract: Distortion of ion structures by field asymmetric waveform ion mobility spectrometry. Information

Substance Name: Ubiquitin

Registry Number: 0

Grant and Affiliation Information for Distortion of ion structures by field asymmetric waveform ion mobility spectrometry.

AFFILIATION: Biological Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA.

Country: United States

AGENCY: United States NCRR

GRANT: RR 18522

ACRONYM: RR

MEDLINETA: Anal Chem

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