Conformation of K+(Crown Ether) Complexes Revealed by Ion Mobility–Mass Spectrometry and Ultraviolet Spectroscopy

2020 ◽  
Vol 124 (48) ◽  
pp. 9980-9990
Author(s):  
Sota Tainaka ◽  
Tomoyuki Ujihira ◽  
Mayuko Kubo ◽  
Motoki Kida ◽  
Daisuke Shimoyama ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Crown Ether ◽  
Ion Mobility ◽  
Ion Mobility Mass Spectrometry ◽  
Ultraviolet Spectroscopy ◽  
Crown Ether Complexes

scholarly journals Crown ethers as shift reagents in peptide epimer differentiation –conclusions from examination of ac-(H)FRW-NH2 petide sequences

2020 ◽  
Vol 23 (2) ◽  
pp. 177-188
Author(s):  
Magdalena M. Zimnicka
Keyword(s):  
Mass Spectrometry ◽  
Crown Ether ◽  
Crown Ethers ◽  
Ion Mobility ◽  
Ion Source ◽  
Peptide Sequence ◽  
Ion Mobility Mass Spectrometry ◽  
Peptide Molecule ◽  
Shift Reagents ◽  
Specific Association

Abstract Crown ethers with different ring sizes and substituents (18-crown-6, dibenzo-18-crown-6, dicyclohexano-18-crown-6, a chiral tetracarboxylic acid-18-crown-6 ether, dibenzo-21-crown-7, and dibenzo-30-crown-10) were evaluated as shift reagents to differentiate epimeric model peptides (tri-and tetrapeptides) using ion mobility mass spectrometry (IM-MS). The stable associates of peptide epimers with crown ethers were detected and examined using traveling-wave ion mobility time-of-flight mass spectrometer (Synapt G2-S HDMS) equipped with an electrospray ion source. The overall decrease of the epimer separation upon crown ether complexation was observed. The increase of the effectiveness of the microsolvation of a basic moiety - guanidine or ammonium group in the peptide had no or little effect on the epimer discrimination. Any increase of the epimer separation, which referred to the specific association mode between crown substituents and a given peptide sequence, was drastically reduced for the longer peptide sequence (tetrapeptide). The obtained results suggest that the application of the crown ethers as shift reagents in ion mobility mass spectrometry is limited to the formation of complexes differing in stoichiometry rather than it refers to a specific coordination mode between a crown ether and a peptide molecule.

scholarly journals Gas-phase microsolvation of ubiquitin: investigation of crown ether complexation sites using ion mobility-mass spectrometry

The Analyst ◽  
2016 ◽  
Vol 141 (19) ◽  
pp. 5502-5510 ◽  
Author(s):  
Melanie Göth ◽  
Frederik Lermyte ◽  
Xiao Jakob Schmitt ◽  
Stephan Warnke ◽  
Gert von Helden ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Crown Ether ◽  
Gas Phase ◽  
Ion Mobility ◽  
Phase Structure ◽  
Side Chain ◽  
Ion Mobility Mass Spectrometry ◽  
Gas Phase Structure

The influence of side chain to backbone interactions on the gas-phase structure of ubiquitin and ubiquitin lysine-to-arginine mutants was analysed.

Rapid Diagnosis of Parkinson’s Disease from Sebum using Paper Spray Ionisation Ion Mobility Mass Spectrometry

2020 ◽  
Author(s):  
Depanjan Sarkar ◽  
Drupad Trivedi ◽  
Eleanor Sinclair ◽  
Sze Hway Lim ◽  
Caitlin Walton-Doyle ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Ion Mobility ◽  
Neurodegenerative Disorder ◽  
Treatment Options ◽  
Ion Mobility Mass Spectrometry ◽  
Paper Spray ◽  
Molecular Features ◽  
Validation Set

Parkinson’s disease (PD) is the second most common neurodegenerative disorder for which identification of robust biomarkers to complement clinical PD diagnosis would accelerate treatment options and help to stratify disease progression. Here we demonstrate the use of paper spray ionisation coupled with ion mobility mass spectrometry (PSI IM-MS) to determine diagnostic molecular features of PD in sebum. PSI IM-MS was performed directly from skin swabs, collected from 34 people with PD and 30 matched control subjects as a training set and a further 91 samples from 5 different collection sites as a validation set. PSI IM-MS elucidates ~ 4200 features from each individual and we report two classes of lipids (namely phosphatidylcholine and cardiolipin) that differ significantly in the sebum of people with PD. Putative metabolite annotations are obtained using tandem mass spectrometry experiments combined with accurate mass measurements. Sample preparation and PSI IM-MS analysis and diagnosis can be performed ~5 minutes per sample offering a new route to for rapid and inexpensive confirmatory diagnosis of this disease.

P‐97: Separation of Isomeric OLED Materials Using Ion Mobility‐Mass Spectrometry (IM‐MS)

2021 ◽  
Vol 52 (1) ◽  
pp. 1444-1447
Author(s):  
Hirotaka Shioji ◽  
Azusa Uematsu ◽  
Motoshi Onoda ◽  
Keiko Matsuda ◽  
Keisuke Sawada ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility ◽  
Ion Mobility Mass Spectrometry
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