scholarly journals 23Na NMR T1 relaxation measurements as a probe for diffusion and dynamics of sodium ions in salt–glycerol mixtures

2021 ◽  
Vol 154 (22) ◽  
pp. 224501
Author(s):  
Carmine D’Agostino ◽  
Stefan J. Davis ◽  
Andrew P. Abbott
Keyword(s):  
Sodium Ions ◽  
T1 Relaxation ◽  
Relaxation Measurements ◽  
23Na Nmr

scholarly journals Multiblock Analysis Applied to TD-NMR of Butters and Related Products

2020 ◽  
Vol 10 (15) ◽  
pp. 5317
Author(s):  
Jean-Michel Roger ◽  
Silvia Mas Garcia ◽  
Mireille Cambert ◽  
Corinne Rondeau-Mouro
Keyword(s):  
Solid Phase ◽  
Fat Content ◽  
Prediction Errors ◽  
Chemometric Methods ◽  
Covariance Selection ◽  
T1 Relaxation ◽  
Repeatability Error ◽  
Measurement Protocol ◽  
Relaxation Measurements ◽  
Better Than

This work presents a novel and rapid approach to predict fat content in butter products based on nuclear magnetic resonance longitudinal (T1) relaxation measurements and multi-block chemometric methods. The potential of using simultaneously liquid (T1L) and solid phase (T1S) signals of fifty samples of margarine, butter and concentrated fat by Sequential and Orthogonalized Partial Least Squares (SO-PLS) and Sequential and Orthogonalized Selective Covariance Selection (SO-CovSel) methods was investigated. The two signals (T1L and T1S) were also used separately with PLS and CovSel regressions. The models were compared in term of prediction errors (RMSEP) and repeatability error (σrep). The results obtained from liquid phase (RMSEP ≈ 1.33% and σrep≈ 0.73%) are better than those obtained with solid phase (RMSEP ≈ 5.27% and σrep≈ 0.69%). Multiblock methodologies present better performance (RMSEP ≈ 1.00% and σrep≈ 0.47%) and illustrate their power in the quantitative analysis of butter products. Moreover, SO-Covsel results allow for proposing a measurement protocol based on a limited number of NMR acquisitions, which opens a new way to quantify fat content in butter products with reduced analysis times.

Spatially resolved T1 relaxation measurements in reservoir cores

1991 ◽  
Vol 9 (5) ◽  
pp. 815-819 ◽  
Author(s):  
J.J. Attard ◽  
T.A. Carpenter ◽  
L.D. Hall ◽  
S. Davies ◽  
M.J. Taylor ◽  
...  
Keyword(s):  
Spatially Resolved ◽  
T1 Relaxation ◽  
Relaxation Measurements

Erratum to “23Na NMR methods for selective observation of sodium ions in ordered environments”

1997 ◽  
Vol 31 (2-3) ◽  
pp. 287 ◽  
Author(s):  
Richard Kemp-Harper ◽  
Steven P. Brown ◽  
Colan E. Hughes ◽  
Peter Styles ◽  
Stephen Wimperis
Keyword(s):  
Sodium Ions ◽  
Nmr Methods ◽  
23Na Nmr

Sodium Ions in Ordered Environments in Biological Systems: Analysis of 23Na NMR Spectra

1999 ◽  
Vol 140 (2) ◽  
pp. 351-362 ◽  
Author(s):  
Richard Kemp-Harper ◽  
Bill Wickstead ◽  
Stephen Wimperis
Keyword(s):  
Systems Analysis ◽  
Nmr Spectra ◽  
Biological Systems ◽  
Sodium Ions ◽  
23Na Nmr
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