|
Chemical shift ratios for indirect referencing of 13C, 15N, and 31P chemical
shifts. Chemical shift ratios are kindly solicited for other X-1H pairs.
Please submit them along with a short description of their derivation to
bmrbhelp@bmrb.wisc.edu.
IUPAC-IUB Recommended Chemical Shift Referencing Ratios2
Nuclei Chemical Shift Sample Literature Reference
Ratio
1H (DSS) 1.000000000 a 1, 2
2H (DSS) 0.153506088 a 2, 5
13C-1H (DSS) 0.251449530 a 1, 2
15N-1H (DSS) 0.101329118 b 1, 2
31P-1H (DSS) 0.404808636 h 2, 6
Temperature Correction Factors
(The IUPAC-IUBMB-IUPAB Task Group
Recommendations do not advocate the use of temperature correction factors.
These correction factors were determined using sample d, described below)
Nuclei Chemical Shift Temp. Factor Literature
Ratio Reference
13C-1H (DSS) 0.251449519 (T - 300 K) x 1.04 x 10-9 1
15N-1H (1H DSS) 0.101329112 (T - 300 K) x 2.74 x 10-10 1
Other Published Chemical Shift Referencing Ratios
Nuclei Chemical Shift Sample Literature Reference
Ratio
13C-1H (DSS) 0.251449528 a 1
13C-1H (DSS) 0.251449537 a 1
13C-1H (DSS) 0.251449519 d 1
13C-1H (DSS) 0.251449531 e 1
13C-1H (TSP) 0.25144954 f 3
15N-1H (1H DSS) 0.101329118 b 1
15N-1H (1H DSS) 0.101329002 e 1
15N-1H (1H DSS) 0.101329112 d 1
15N-1H (1H TMS) 0.1013291444 g 4 (Derived for liquid ammonia)
15N-1H (1H TMS) 0.10136767 n 4 (CH3NO2/TMS ratio)
19F-1H (DSS) 0.940867196 i 7 (TFA in a capillary)
19F-1H (DSS) 0.940866982 i 7 (TFA in a sphere)
19F-1H (DSS) 0.940865707 j 7 (TFE in a capillary)
19F-1H (DSS) 0.940865527 j 7 (TFE in a sphere)
31P-1H (DSS) 0.404807210 k 7 (H3PO4 in a capillary)
31P-1H (DSS) 0.404807356 k 7 (H3PO4 in a sphere)
31P-1H (DSS) 0.404806249 m 7 (PCr in a capillary)
31P-1H (DSS) 0.404806249 m 7 (PCr in a sphere)
Samples used in deriving the chemical shift ratio.
Sample Designation Sample Contents and Conditions
a 10 mM DSS in 99.8 % D2O, 25 C
b 10 mM DSS in 99.8% D2O with anhydrous liquid
ammonia in an external capillary, 25 C
d DSS in 1 M NH4NO3, 1 M HNO3, 25 C
e 5 mM DSS in liquid ammonia, 25 C
f TSP in D2O, 22 C
g Derived for liquid ammonia from a sample of TMS in CH3NO2
h 10% trimethylphosphate; 2 mM DSS in 99.8% D2O, 25 C
i 10 mM DSS in D2O pH 7.0, outer volume;
100% trifluoroacetic acid (capillary or
sphere): 25 C
j 10 mM DSS in D2O pH 7.0, outer volume;
100% trifluorethanol (capillary or sphere): 25 C
k 10 mM DSS in D2O pH 7.0, outer volume;
85% ortho-phosphoric acid in H2O
(capillary or sphere): 25 C
m 10 mM DSS in D2O pH 7.0, outer volume:
10 mM phosphocreatine in H2O
(capillary or sphere): 25 C
n TMS in CH3NO2
References:
1. Wishart, D. S., Bigam, C. G., Yao, J., Abildgaard, F., Dyson, H. J.,
Oldfield, E., Markley, J. L., and Sykes, B. D., "1H, 13C and 15N Chemical
Shift Referencing in Biomolecular NMR," J. Biomol. NMR 6, 135-140 (1995).
2. Markley, J. L., Bax, A., Arata, Y., Hilbers, C. W., Kaptein, R., Sykes, B. D.,
Wright, P. E., and Wüthrich, K., "Recommendations for the Presentation of NMR
Structures of Proteins and Nucleic Acids,". Pure & Appl. Chem. 70,
117-142 (1998).
3. Bax, A. and Subramanian, J., "Sensitivity-Enhanced Two-Dimensional
Heteronuclear Shift Correlation NMR Spectroscopy," J. Magn. Reson.
67, 565-570 (1986).
4. Live, D. H., Davis, D. G., Agosta, W. C., and Cowburn, D., "Long Range
Hydrogen Bond Mediated Effects in Peptides: 15N NMR Study of Gramicidin S in
Water and Organic Solvents," J. Am. Chem. Soc. 106, 1939-1943
(1984).
5. The chi value recommended here for 2H was determined from the ratios of
1H and 2H signals of a water sample at 298 K as measured by Dr. Frits Abildgaard
and David LeMaster at the National Magnetic Resonance Facility at Madison. This
value is a surrogate for the isotopomers of DSS, and its derivation assumes that
there is no primary isotope effect on the ratio.
6. The chi value recommended here for 31P is the average of values determined
independently, one at the National Magnetic Resonance Facility at Madison by
F. Abildgaard (40.4808651), and the other at the National Institutes of Health
by A. Bax (40.480862). Measurements were made at 298 K in D2O solution containing
10% trimethylphosphate as the indirect reference and DSS as the direct reference.
7. Maurer, T. and Kalbitzer, H. R., "Indirect Referencing of 31P and 19F NMR
Spectra," J. Magn. Reson. B 113, 177-178 (1996).
|
