Details

Autor(en) / Beteiligte

• Acharya, Baku
• Kaushalya, W K D N
• Martens, Jonathan
• Berden, Giel
• Oomens, Jos
• Patrick, Amanda L

Titel

A Combined Infrared Ion Spectroscopy and Computational Chemistry Study of Hydroxyproline Isomers

Ist Teil von

• Journal of the American Society for Mass Spectrometry, 2020-06, Vol.31 (6), p.1205-1211

Ort / Verlag

United States

Erscheinungsjahr

2020

Quelle

MEDLINE

Beschreibungen/Notizen

• Hydroxyproline is a common variation of proline, with diverse biological roles. The hydroxylation of proline gives rise to several (natural and/or synthetic) isomeric forms, including both positional isomers and stereoisomers. While mass spectrometry is widely touted as a very selective analytical technique, the identification of closely related isomers often poses a challenge. In these cases, allied technologies become helpful in providing full characterization. Here, infrared multiple photon dissociation (IRMPD) spectroscopy is used to differentiate between three isomers, namely -3-hydroxyproline, -4-hydroxyproline, and -4-hydroxyproline. In contrast to the protonated species which show only minor variations in their IRMPD spectra, lithiated species were found to display significant spectral differences, making their differentiation more straightforward. The conformational origin of these spectral differences was investigated by complementary quantum-chemical calculations.