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

Klaus Lorenz*,a and Caroline M. Prestonb

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



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Fig. 1. Solution 13C nuclear magnetic resonance (NMR) spectrum of (a) purified black spruce tannin and (b) expansion of C3–C2 region.

 


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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.

 


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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.

 





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