On the 13C CP/MAS spectra of leucine.
The CP/MAS 13C NMR spectra of crystalline L-leucine and DL-leucine at 7 T are compared with previously reported spectra at lower field strengths. An increasing dominance of chemical shift effects over residual 14N-13C dipolar interactions is observed on the C alpha and C beta splittings with increasing field strength. A new structure is observed in the 25 ppm region of both samples. The spectra in this region were assigned by application of the depolarisation-repolarisation method. The assignment showed differences in the ordering of peaks between solid state and liquid state chemical shifts.
Belton
P S
PS
AFRC Institute of Food Research, Norwich Research Park, Colney, UK.
Gil
A M
AM
Tanner
S F
SF
D002244:Carbon / Q000737:chemistry; D002247:Carbon Isotopes; D003460:Crystallization; D007930:Leucine / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D015394:Molecular Structure; D009584:Nitrogen / Q000737:chemistry; D012996:Solutions
D002247:Carbon Isotopes; D012996:Solutions; D002244:Carbon; D007930:Leucine; D009584:Nitrogen