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Characterization of High-Tannin Fractions from Humus by Carbon-13 Cross-Polarization and Magic-Angle Spinning Nuclear Magnetic Resonance

^a Institute of Soil Science, University of Hohenheim, Emil-Wolff-Str. 27, D-70593 Stuttgart, Germany
^b Pacific Forestry Centre, Natural Resources Canada, 506 West Burnside Rd., Victoria, BC, V8Z 1M5 Canada

View larger version (28K): [in a new window]   Fig. 1. Solution 13C nuclear magnetic resonance (NMR) spectrum of (a) purified black spruce tannin and (b) expansion of C3–C2 region.

View larger version (18K): [in a new window]   Fig. 2. Normal cross-polarization and magic-angle spinning (CPMAS) and dipolar dephased (DD)–total suppression of spinning sidebands (TOSS) CPMAS 13C nuclear magnetic resonance (NMR) spectra. (a) Humus. (b) Extraction residue.

View larger version (21K): [in a new window]   Fig. 3. Normal cross-polarization and magic-angle spinning (CPMAS) and dipolar dephased (DD)–total suppression of spinning sidebands (TOSS) CPMAS 13C nuclear magnetic resonance (NMR) spectra. (a) Emulsified humus fraction. (b) Aqueous humus fraction.