On the 13C CP/MAS spectra of leucine. |
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| Authors: | P S Belton A M Gil S F Tanner |
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| Institution: | AFRC Institute of Food Research, Norwich Research Park, Colney, UK. |
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| Abstract: | 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. |
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