Chirality-dependent structuration of protonated or sodiated polyphenylalanines: IRMPD and ion mobility studies

2016 ◽  
Vol 18 (3) ◽  
pp. 1807-1817 ◽  
Author(s):  
Valeria Lepere ◽  
Katia Le Barbu-Debus ◽  
Carine Clavaguéra ◽  
Debora Scuderi ◽  
Giovanni Piani ◽  
...  
Keyword(s):  
Ion Mobility ◽  
Irmpd Spectroscopy ◽  
Mobility Studies

Ion mobility experiments are combined with IRMPD spectroscopy for assessing the role of chirality in the structure of protonated and sodiated di- or tetra-peptides.

Mass-analysed ion mobility studies of nitrobenzene

1984 ◽  
Vol 60 (1) ◽  
pp. 137-145 ◽  
Author(s):  
C.J. Proctor ◽  
J.F.J. Todd ◽  
R.B. Turner
Keyword(s):  
Ion Mobility ◽  
Mobility Studies

The Role of Ion Mobility Spectrometry–Mass Spectrometry in the Analysis of Protein Reference Standards

2013 ◽  
Vol 85 (15) ◽  
pp. 7205-7212 ◽  
Author(s):  
Caroline Pritchard ◽  
Gavin O’Connor ◽  
Alison E. Ashcroft
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Reference Standards

scholarly journals On Stereocontrol in Organocatalytic α-Chlorinations of Aldehydes

2021 ◽  
Author(s):  
Sebastian Ponath ◽  
Chetan Joshi ◽  
Amy T. Merrill ◽  
Volker Schmidts ◽  
Kim Greis ◽  
...  
Keyword(s):  
Ion Mobility ◽  
Resting State ◽  
Comprehensive Analysis ◽  
Ion Mobility Mass Spectrometry ◽  
Concentration Profiles ◽  
Nmr Studies ◽  
Isotope Studies ◽  
Configuration And Conformation

A comprehensive analysis of the organocatalytic α‐chlorination of aldehydes with N‐chloroimides and differ‐ ent catalysts is presented. For this reaction, alternate mechanisms were proposed that differ in the role of resting state intermediates and the rationalization of the observed enantioselectivity. This manuscript aims at resolving these funda‐ mental questions on the basis of rigorous structural characterization of intermediates (configuration and conformation), NMR studies, ion mobility‐mass spectrometry, concentration profiles, isotope studies, and DFT calculations. <br>

scholarly journals PQQ-Aza-Crown Ether Complexes as Biomimetics for Lanthanide and Calcium Dependent Alcohol Dehydrogenases

2021 ◽  
Author(s):  
Violeta A. Vetsova ◽  
Katherine R. Fisher ◽  
Henning Lumpe ◽  
Alexander Schäfer ◽  
Erik K. Schneider ◽  
...  
Keyword(s):  
Metal Ions ◽  
Gas Phase ◽  
Ion Mobility ◽  
Paramagnetic Resonance ◽  
Calcium Dependent ◽  
Lower Charge ◽  
Crown Ether Complexes ◽  
Recent Group ◽  
Electron Paramagnetic

<div>Understanding the role of metal ions in biology can lead to the development of new catalysts for</div><div>several industrially important transformations. Lanthanides are the most recent group of metal ions</div><div>that have been shown to be important in biology i.e. - in quinone-dependent methanol</div><div>dehydrogenases (MDH). Here we evaluate a pyrroloquinoline quinone and 1-aza-15-crown-5 based</div><div>ligand platform as scaffold for Ca2+ , Ba2+ , La3+ and Lu3+ biomimetics of MDH and we evaluate the</div><div>importance of ligand design, charge, size, counterions and base for the alcohol oxidation reaction</div><div>using NMR spectroscopy. In addition, we report a new straightforward synthetic route (3 steps</div><div>instead of 11 and 33% instead of 0.6% yield) for biomimetic ligands based on PQQ. We show that</div><div>when studying biomimetics for MDH, larger metal ions and those with lower charge in this case</div><div>promote the dehydrogenation reaction more effectively and that this is likely an effect of the ligand</div><div>design which must be considered when studying biomimetics. To gain more information on the</div><div>structures and impact of counterions of the complexes, we performed collision induced dissociation</div><div>(CID) experiments and observe that the nitrates are more tightly bound than the triflates. To resolve</div><div>the structure of the complexes in the gas phase we combined DFT-calculations and ion mobility</div><div>measurements (IMS). Furthermore, we characterized the obtained complexes and reaction mixtures</div><div>using Electron Paramagnetic Resonance (EPR) spectroscopy and show the emergence of a quinone-</div><div>based radical during the reaction with substrate and base.</div>

Ion Mobility Studies of PdCn+ Clusters: Where Are the Fullerenes?

1995 ◽  
Vol 99 (50) ◽  
pp. 17677-17679 ◽  
Author(s):  
Konstantin B. Shelimov ◽  
Martin F. Jarrold
Keyword(s):  
Ion Mobility ◽  
Mobility Studies

‘Memory objects’: Material objects and memories of home in the context of intra-African mobility

2019 ◽  
Vol 24 (3) ◽  
pp. 253-269
Author(s):  
Sabine Marschall
Keyword(s):  
Material Culture ◽  
Cultural Values ◽  
Social Relations ◽  
African Countries ◽  
Home Culture ◽  
Mobility Studies ◽  
Specific Factors ◽  
Involuntary Memories ◽  
Depth Interviews

This article contributes to the intersection of material culture and mobility studies by exploring the role of objects in fostering nostalgia and emotionally linking migrants with their home world. ‘Memory objects’ are conceptualized as special personal belongings that elicit deliberate or involuntary memories of homeland, home culture, social relations and episodes in one’s pre-migration past. Focusing on intra-African migration, the study is based on in-depth interviews with a sample of 40 migrants from 13 African countries, temporarily or permanently based in South Africa. Contrary to the extant literature, initial findings indicate most participants did not value keepsakes or sentimental mementoes of home. However, it emerged that some had developed a special relationship with specific utilitarian objects, mostly received as gifts, which essentially turned into memory objects over time, precipitating memories and emotional attachment through routine usage and performative action. It is argued that more attention must be paid to socio-cultural values and other locally specific factors.

Sign in / Sign up

Export Citation Format

Share Document