Improvement of spectral editing in solids: A sequence for obtaining (CH)-C-13+(CH2)-C-13-only C-13 spectra

An improved spectral editing method for solids is described which allows on e to obtain a set of subspectra in roughy two-thirds the amount of time as our original CPPI editing method for the same signal to noise. This improve ment is afforded by a new pulse sequence that is used to acquire a (CH)-C-1 3 + (CH2)-C-13 spectrum which has very little (CH3)-C-13 or nonprotonated c arbon contamination, By using this new sequence the (CH)-C-13-only subspect rum is obtained much more efficiently. Criteria for optimizing the signal t o noise in the edited subspectra are discussed. (C) 2000 Academic Press.