The Nature of Non-Proanthocyanidin Units in ‘Condensed Tannins’ from Conifer Wood and Bark

  • Herbert L. Hergert
Part of the Basic Life Sciences book series (BLSC, volume 59)


Recent successes in the isolation and characterization of oligomeric proan-thocyanidins from the phloem (inner bark) of conifers has led to the conclusion by some investigators that ‘The essential features of condensed tannin structure have been elucidated.’ Our work shows that many conifer wood tannins are not based on flavan units, and even when they are, they may be copolymerized with guaiacylic polymers or contain other monomers such as flavanones, flavones, or stilbenes. The polymeric polyphenols of Sequoia heartwood, for example, appear to be derived from norlignans. Thuja tannins are derived from naphthalenic lignans. To gain an accurate picture of condensed tannins in conifers, detailed studies of the heartwood and the outer bark from each genus are needed as well as of the phloem.


Condensed Tannin Vanillic Acid Western Hemlock Outer Bark Heartwood Formation 
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Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Herbert L. Hergert
    • 1
  1. 1.Repap Technologies, Inc.Valley ForgeUSA

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