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Polyphenols in heartwood, sapwood, and knots of  Acacia crassicarpa  and  Acacia mangium  were analysed using GC, GC-MS, HPSEC, and NMR. Melacacidin and isomelacacidin dominated in  A. crassicarpa  and teracacidin and its ketone in  A. mangium . Also, bi- and triflavonoids were tentatively identified in the samples. The amounts of polyphenols were larger in the knots than in the heartwood of both species, while the composition within the species was the same.

Bioactive phenolic substances in important tree species. Part 3: Knots and stemwood of Acacia crassicarpa and A. mangium