Multiple-quantum polarization-transfer coherence pathways in liquids

Bulsing, J.Mark; Doddrell, David M.

doi:10.1016/0022-2364(85)90076-9

Cited by 10 publications

(11 citation statements)

References 15 publications

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“…The intensities of 13C NMR signals acquired by the POMMIE technique (7,8) have the same theoretical dependences on the phase shift c+ as do the corresponding DEFT intensities on the pulse flip angle 0 (1, 2). These dependences are C H = k sin x, CH2 = k sin 2x, and CH3 = 3k (sin x + sin 3-414, where k = yH/yc, andx = c+ or 0.…”

Section: ?mentioning

confidence: 80%

“…A number of practical advantages have been claimed for an alternative polarization transfer technique, namely, the Phase Oscillations to MaxiMIze ~d i t i n g (POMMIE) method (7,8), which in its 1D form is similar to DEFT, except that the polarization transfer pulse (0) in the latter method is supplanted by a pair of successive 90" pulses that are arranged to have a variable phase difference c+. The intensities of 13C NMR signals acquired by the POMMIE technique (7,8) have the same theoretical dependences on the phase shift c+ as do the corresponding DEFT intensities on the pulse flip angle 0 (1, 2).…”

Section: ?mentioning

confidence: 99%

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Two-dimensional POMMIE carbon–proton chemical shift correlated ¹³C NMR spectrum editing

Coxon¹

1990

Can. J. Chem.

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Two pulse sequences are described for acquisition of two-dimensional, carbon–proton chemical shift correlated 13C NMR spectra by the "phase oscillations to maximize editing technique". One of these sequences provides two-dimensional, carbon–proton chemical shift correlated spectra in which the 1H–1H coupling constants are present in the 1H chemical shift dimension, whereas the other sequence includes a bilinear rotation decoupling unit that removes the vicinal 1H–1H couplings in this dimension. Extensions of these techniques to generation of two-dimensional, carbon–proton chemical shift correlated CH, CH2, and CH313C NMR subspectra from linear combinations of three two-dimensional data sets are described. Decreased residual signals in the edited 2D subspectra have been achieved by Pascal programs that include six floating point coefficients, and a method for their calibration is discussed. Results are reported for troleandomycin (1). Keywords: 13C nuclear magnetic resonance, carbon–proton chemical shift correlation, DEPT, Pascal programs, POMMIE, two-dimensional NMR spectrum editing, troleandomycin.

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Section: ?mentioning

confidence: 80%

Section: ?mentioning

confidence: 99%

Two-dimensional POMMIE carbon–proton chemical shift correlated ¹³C NMR spectrum editing

Coxon¹

1990

Can. J. Chem.

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“…The radiofrequency pulse sequence used for measuring two-spin order relaxation is part of the DEPT pulse sequence (Bulsing and Doddrell, 1985),…”

Section: P Nmr Relaxationmentioning

confidence: 99%

“…The two proton pulses generate 'H --31p coherence transfer and the phosphorus pulse converts the two-spin order coherence into single-quantum coherence for 31p observation. Immediately after the generation of coherence transfer the density matrix for the system is given by (Bulsing and Doddrell, 1985), p(t = 0) = (1/8)(1 + h(ApIIkT ± hO)H(2IzSz)/kT), (13) where Cp and aw are the 31P and 'H Larmor frequencies, respectively. The sign of the third term in Eq.…”

Section: P Nmr Relaxationmentioning

confidence: 99%

Microviscosity of human erythrocytes studied using hypophosphite two-spin order relaxation

Price¹,

Perng²,

Tsai³

et al. 1992

Biophysical Journal

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A new 31P NMR method is used to probe the cytoplasmic viscosity of human erythrocytes. The method is based on observing two-spin order relaxation of the 31P atom of the hypophosphite ion. This method is superior to our previous method, using the longitudinal relaxation time of the ion, because random field effects such as intermolecular dipole-dipole relaxation can be separated from intramolecular relaxation. This allows a more accurate determination of the effective reorientational correlation time from the measured intramolecular relaxation because it is now unaffected by random field effects. The new method also provides a means by which to estimate the random field effects. Both two-spin order and proton-decoupled T1 measurements were conducted on hypophosphite in water solutions at various temperatures, glycerol solutions of various viscosities, and in erythrocyte samples of various cell volumes. The results show that the effective reorientational correlation time of the hypophosphite ion varies from 7.2 to 15.2 ps in the cytoplasm of cells ranging in volume from 102 to 56 fl cells.

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“…Polarization transfer from high natural abundance nucleus to low natural abundance nucleus is widely used for heteronuclear weakly coupled spin systems in liquid-state NMR experiments [1][2][3]. The most common examples for the polarization transfer experiments are Distortionless Enhancement by Polarization Transfer (DEPT) and Insensitive Nuclei Enhanced by Polarization Transfer (INEPT).…”

Section: Introductionmentioning

confidence: 99%

2D <i>J</i>–INEPT NMR Spectroscopy for CD<sub>n</sub> Groups: A Theoretical Study

Gençten

Şaka

2011

JMP

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2D J-INEPT NMR experiment is a combination of heteronusclear 2D J-Resolved and INEPT experiments. In this study, 2D J-INEPT experiment was analytically investigated by using product operator theory for weakly coupled IS n (I = 1/2, S = 1; n = 1, 2, 3) spin systems. The obtained theoretical results represent the FID values of CD, CD 2 and CD 3 groups. In order to make Fourier transform of the obtained FID values, a Maple program is used and then simulated spectra for of 2D J-INEPT experiment are obtained for CD, CD 2 and CD 3 groups. It is found that 2D J-INEPT is a useful experiment for both polarisation transfer and 2D J-resolved spectral assignment for CD n groups in complex molecules.

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Multiple-quantum polarization-transfer coherence pathways in liquids

Cited by 10 publications

References 15 publications

Two-dimensional POMMIE carbon–proton chemical shift correlated ¹³C NMR spectrum editing

Two-dimensional POMMIE carbon–proton chemical shift correlated ¹³C NMR spectrum editing

Microviscosity of human erythrocytes studied using hypophosphite two-spin order relaxation

2D <i>J</i>–INEPT NMR Spectroscopy for CD<sub>n</sub> Groups: A Theoretical Study

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Multiple-quantum polarization-transfer coherence pathways in liquids

Cited by 10 publications

References 15 publications

Two-dimensional POMMIE carbon–proton chemical shift correlated 13C NMR spectrum editing

Two-dimensional POMMIE carbon–proton chemical shift correlated 13C NMR spectrum editing

Microviscosity of human erythrocytes studied using hypophosphite two-spin order relaxation

2D &lt;i&gt;J&lt;/i&gt;–INEPT NMR Spectroscopy for CD&lt;sub&gt;n&lt;/sub&gt; Groups: A Theoretical Study

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Two-dimensional POMMIE carbon–proton chemical shift correlated ¹³C NMR spectrum editing

Two-dimensional POMMIE carbon–proton chemical shift correlated ¹³C NMR spectrum editing

2D <i>J</i>–INEPT NMR Spectroscopy for CD<sub>n</sub> Groups: A Theoretical Study