An approach to spinning sideband (SSB) separation of protonated and no
n-protonated carbons in slow spinning conditions via dipolar dephasing
is proposed. This method offers two features: SSB spectral simplifica
tion, which greatly reduces the overlaps encountered in a usual SSB sp
ectrum, and spectral distinction of overlapped resonances for protonat
ed and non-protonated carbons. The C-13 chemical shift anisotropies of
the 20 amino acids as polycrystalline powdered solids were completely
measured with the SSB intensity analyses as an application of the sug
gested approach.