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Gas phase hydrogen/deuterium exchange in electrospray ionization mass spectrometry as a practical tool for structure elucidation
Two methods for gas phase hydrogen/deuterium exchange have been developed for the analysis of small molecules. Hydrogen/deuterium exchange has been implemented by making simple modifications to the plumbing for the nebulizer and curtain gases on a nebulization-assisted electrospray ion source. The n...
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Published in: | Journal of the American Society for Mass Spectrometry 1994-05, Vol.5 (5), p.434-442 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Two methods for gas phase hydrogen/deuterium exchange have been developed for the analysis of small molecules. Hydrogen/deuterium exchange has been implemented by making simple modifications to the plumbing for the nebulizer and curtain gases on a nebulization-assisted electrospray ion source. The nebulizer gas exchange method has demonstrated deuterium exchange levels of 84–97% for a variety of molecules representing a wide range of structural classes containing up to 51 potentially exchangeable hydrogens; this allowed determination of the number of exchangeable hydrogens for all of the molecules studied containing ≤ 25 labile hydrogens (
M
r
≤ 3000). ND
3 gas consumption is minimized in the nebulizer method by toggling the nebulizer from air to ND
3 for only a few scans of the total sample elution period. The curtain gas exchange method is more variable, yielding exchange levels of 32–98% for the same set of molecules; this was still sufficient to allow determination of > 70% of the molecules studied containing ≤ 25 labile hydrogens. Gas consumption is minimized in the curtain method by replacing ≤ 10% of the curtain gas flow with ND
3. Neither the nebulizer nor curtain exchange method requires the use of deuterated or aprotic solvents at typical 2 μL/min flow rates. |
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ISSN: | 1044-0305 1879-1123 |
DOI: | 10.1016/1044-0305(94)85059-3 |