shift reagents
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Separations of Carbohydrates with Noncovalent Shift Reagents by Frequency-Modulated Ion Mobility-Orbitrap Mass Spectrometry

2021 ◽  
Author(s):  
Kristin R. McKenna ◽  
Brian H. Clowers ◽  
Ramanarayanan Krishnamurthy ◽  
Charles L. Liotta ◽  
Facundo M. Fernández
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility ◽  
Orbitrap Mass Spectrometry ◽  
Shift Reagents

Exchange-modified DOSY experiments. the use of chiral solvating agents and lanthanide shift reagents as matrices

2021 ◽  
Author(s):  
Gábor Szalontai
Keyword(s):  
Organic Molecules ◽  
Small Organic Molecules ◽  
Lanthanide Shift Reagents ◽  
Shift Reagents

(S)-BINOL and Eu(fod)3 were tried as matrices to improve DOSY performance and Dt and MW prediction power on small organic molecules.

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.

Screening of chiral shift reagents suitable to generically separate the enantiomers of V-agents by 31P-NMR spectroscopy

2020 ◽  
Vol 320 ◽  
pp. 28-36
Author(s):  
Marianne Koller ◽  
Horst Thiermann ◽  
Franz Worek
Keyword(s):  
Nmr Spectroscopy ◽  
31P Nmr ◽  
31P Nmr Spectroscopy ◽  
Shift Reagents

Organic acid shift reagents for the discrimination of carbohydrate isobars by ion mobility-mass spectrometry

The Analyst ◽  
2020 ◽  
Vol 145 (24) ◽  
pp. 8008-8015
Author(s):  
Kristin R. McKenna ◽  
Li Li ◽  
Ramanarayanan Krishnamurthy ◽  
Charles L. Liotta ◽  
Facundo M. Fernández
Keyword(s):  
Mass Spectrometry ◽  
Organic Acid ◽  
Ion Mobility ◽  
Traveling Wave ◽  
Drift Tube ◽  
Ion Mobility Mass Spectrometry ◽  
Mixture Analysis ◽  
Shift Reagents

Traveling wave and drift tube ion mobility were utilized to separate isomeric disaccharides. Organic acid shift reagents were necessary to increase the resolution of these separations for mixture analysis.

Effectiveness and Limitations of Computational Chemistry and Mass Spectrometry in the Rational Design of Target-specific Shift Reagents for Ion Mobility Spectrometry

ChemPhysChem ◽  
2018 ◽  
Vol 19 (21) ◽  
pp. 2921-2930 ◽  
Author(s):  
Christopher Kune ◽  
Jean R. N. Haler ◽  
Johann Far ◽  
Edwin De Pauw
Keyword(s):  
Mass Spectrometry ◽  
Computational Chemistry ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Rational Design ◽  
Shift Reagents

scholarly journals CEST-MRI studies of cells loaded with lanthanide shift reagents

2018 ◽  
Vol 80 (4) ◽  
pp. 1626-1637 ◽  
Author(s):  
Giuseppe Ferrauto ◽  
Enza Di Gregorio ◽  
Daniela Delli Castelli ◽  
Silvio Aime
Keyword(s):  
Mri Studies ◽  
Cest Mri ◽  
Lanthanide Shift Reagents ◽  
Shift Reagents

scholarly journals Insight into the Structure Elucidation of Flavonoids ThroughUV-Visible Spectral Analysis of Quercetin Derivatives Using Shift Reagents

2017 ◽  
Vol 37 ◽  
pp. 55-64
Author(s):  
Gan Bahadur Bajracharya ◽  
Mohan Paudel ◽  
Rajendra KC
Keyword(s):  
Spectral Analysis ◽  
Structure Elucidation ◽  
Quercetin Derivatives ◽  
Shift Reagents ◽  
Insight Into

available with fulltext  

Utilizing tagged paramagnetic shift reagents to monitor protein dynamics by NMR

2017 ◽  
Vol 1865 (11) ◽  
pp. 1555-1563 ◽  
Author(s):  
Libin Ye ◽  
Ned Van Eps ◽  
Xiang Li ◽  
Oliver P. Ernst ◽  
R. Scott Prosser
Keyword(s):  
Protein Dynamics ◽  
Paramagnetic Shift ◽  
Shift Reagents
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