Tag Archives: band-selective

HOBS experiments to measure T₁/T₂ relaxation times in overlapped regions

2014-05-14Methods & Applications, Our Publications, Our Research, Uncategorizedband-selective, CPMG, enhanced resolution, full sensitivity, HOBS, homodecoupling, homonuclear decoupling, Inversion Recovery, PROJECT, pure-shift NMR, Relaxation times, T1-relaxation, T2-relaxationLaura

“Measurement of T₁/T₂ relaxation times in overlapped regions from homodecoupled ¹H singlet signals” by Laura Castañar, Pau Nolis, Albert Virgili and Teodor Parella. Journal of Magnetic Resonance 244 (2014) 30-35. DOI: 10.1016/j.jmr.2014.04.003

The implementation of the HOmodecoupled Band-Selective (HOBS) technique in the conventional Inversion-Recovery and CPMG-based PROJECT experiments is described. The achievement of fully homodecoupled signals allows the distinction of overlapped ¹H resonances with small chemical shift differences. It is shown that the corresponding T₁ and T₂ relaxation times can be individually measured from the resulting singlet lines using conventional exponential curve-fitting methods. Continue reading HOBS experiments to measure T₁/T₂ relaxation times in overlapped regions →

Rapid and efficient enantiodifferentiation through frequency-selective pure-shift ¹H NMR spectroscopy

2014-03-06Methods & Applications, Our Publications, Our Researchband-selective, enantiodifferentiation, enhanced resolution, full sensitivity, HOBS, homodecoupling, homonuclear decoupling, pure-shift NMRLaura

“Enantiodifferentiation through Frequency-Selective Pure-Shift ¹H Nuclear Magnetic Resonance Spectroscopy” by Laura Castañar, Míriam Pérez-Trujillo, Pau Nolis, Eva Monteagudo , Albert Virgili and Teodor Parella. ChemPhysChem,15 (2014) 854-857.

DOI: 10.1002/cphc.201301130

A frequency-selective 1D ¹H NMR experiment for the fast and sensitive determination of chemical shift differences between overlapped resonances is proposed. The resulting fully homodecoupled ¹H resonances appear as resolved 1D singlets without their typical J_HH multiplet structure. The achieved high signal dispersion is here exploited in enantiodiscrimination studies using chiral solvating agents. Continue reading Rapid and efficient enantiodifferentiation through frequency-selective pure-shift ¹H NMR spectroscopy →

Pure Shift NMR & HOBS Experiments

2013-12-16Methods & Applications, Our Research, Seminarsband-selective, enhanced resolution, full sensitivity, HOBS, HOBS-HSQC, HOBS-TOCSY, homodecoupling, homonuclear decoupling, HSQC, multiple frequency pulses, proton-carbon coupling constants, pure-shift NMR, TOCSYLaura

SeRMN seminar

Date: Monday 16th December, 2013
Hour: 10 am
Location: SeRMN, Facultats de Ciències i Biociències, C2/-135
Speaker: Laura Castañar, SeRMN PhD Student & Teaching Assistant, Dept. of Chemistry.

A NMR pulse scheme that provides full sensitivity in homodecouped band-selective NMR experiments is proposed. Continue reading Pure Shift NMR & HOBS Experiments →

Implementing homo- and heterodecoupling in region-selective HSQMBC experiments

2013-12-04Methods & Applications, Our Publications, Our Researchband-selective, HOBS, homonuclear decoupling, HSQMBC, IPAP, proton-carbon coupling constants, pure-shift NMR, resolution enhancement, sensitivity enhancementLaura

“Implementing homo- and heterodecoupling in region-selective HSQMBC experiments” by Laura Castañar, Josep Sauri, Pau Nolis, Albert Virgili and Teodor Parella. Journal of Magnetic Resonance 238 (2014) 63-69.

DOI: 10.1016/j.jmr.2013.10.022

A NMR method to enhance the sensitivity and resolution in band-selective long-range heteronuclear correlation spectra is proposed. The excellent in-phase nature of the selHSQMBC experiment allows that homonuclear and/or heteronuclear decoupling can be achieved in the detected dimension of a 2D multiple-bond correlation map, obtaining simplified cross-peaks without their characteristic fine J multiplet structure. The experimental result is a resolution improvement while the highest sensitivity is also achieved. Specifically, it is shown that the 1H-homodecoupled band-selective (HOBS) HSQMBC experiment represents a new way to measure heteronuclear coupling constants from the simplified in-phase doublets generated along the detected dimension.

Pulse Programs Code for Bruker:

Data set Example:

Cyclosporine

References:

“Full sensitivity and enhanced resolution in homodecoupled band-selective NMR experiments” by L. Castañar, P. Nolis, A. Virgili and T. Parella. Chem. Eur. J. 2013, 19, 17283-17286. DOI: https://dx.doi.org/10.1002/chem.201303235

Full sensitivity and enhanced resolution in homodecoupled band-selective NMR experiments

2013-11-13Methods & Applications, Our Publications, Our Researchband-selective, enhanced resolution, full sensitivity, HOBS, HOBS-HSQC, HOBS-TOCSY, homodecoupling, homonuclear decoupling, HSQC, multiple frequency pulses, proton-carbon coupling constants, pure-shift NMR, sensitivity enhancement, TOCSYLaura

“Full sensitivity and enhanced resolution in homodecoupled band-selective NMR experiments” by Laura Castañar, Pau Nolis, Albert Virgili and Teodor Parella. Chem. Eur. J. 2013, 19, 17283-17286.

DOI: 10.1002/chem.201303235

A NMR pulse scheme that provides full sensitivity in homodecouped band-selective NMR experiments is proposed. Continue reading Full sensitivity and enhanced resolution in homodecoupled band-selective NMR experiments →

SeRMN – NMR Service at UAB

Research & development, training, and facility management