Wood Science and Technology

, Volume 52, Issue 3, pp 873–886 | Cite as

Inhibitory activities of tree bark extracts against AGEs formation and their correlation with phenolic components

  • Kengo Shigetomi
  • Naoki Okada
  • Takashi Kumaki
  • Shinya Mitsuhashi
  • Makoto Ubukata


Advanced glycation end-products (AGEs) are one of the pivotal factors that cause a variety of diabetes complications. To explore a new class of natural resources that can prevent AGEs formation, the inhibitory activities of tree bark extracts against AGEs formation were evaluated. Most of the crude extracts of inner or outer bark showed equal or superior inhibitory activities to aminoguanidine, a conventional AGEs formation inhibitor. The quantification of phenolic components of each bark extract revealed that proanthocyanidins were one of the principal factors for inhibition, whereas flavonoids, such as flavones/flavonols and flavanones/dihydroflavonols were not a major factor. This study focused on the outer bark extract from Betula platyphylla which showed exceptionally high activity despite its low contents of total phenolics and proanthocyanidins. The bioassay-guided isolation revealed that betulin caffeate and its two derivatives were active principles in extract of B. platyphylla. These compounds exhibited up to ninefold higher activity than methyl caffeate, which suggested that betulin moiety plays a synergistic role in the activity. These results demonstrated the potency of bark extract as the screening source of AGEs inhibitors and also provided a new insight for the exploration of anti-AGEs substances from natural resources.



This work was supported in part by a fund provided by Institute for Fermentation, Osaka (IFO). We also express our gratitude to Field Science Center for Northern Biosphere, Hokkaido University for the assistance of sample collection and identification of species.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Graduate School of AgricultureHokkaido UniversitySapporoJapan

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