13C-NMR Spectra of Kraft Lignins

Spruce (Picea abies) chips were pulped according to a normal kraft process to different pulp yields. The dissolved lignins were isolated and characterized by C-NMR spectroscopy. The spectra obtained were assigned by comparing the chemical shifts of the various Signals with shifts of Signals from C-NMR spectra of appropriate lignin model compounds. The chemical shifts of 60 lignin model compounds are presented.

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