Time reversal of cross-polarization in solid-state NMR
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Solid-state 2-D double cross polarization magic angle spinning N C NMR spectroscopy on degraded algal residues
Solid-state 2-D N C NMR spectroscopy was applied for the ®rst time to reveal the chemical nature of nitrogen in degraded algae. Cross peaks indicating coupling between C and N were detected only for carboxyl/amide-C and Nsubstituted-alkyl-C. Cross peaks correlating N intensity to sp-C and supporting the presence of heteroaromatic-N were not observed. The Bloch decay N NMR spectrum demonstrated ...
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