Table 1 Total phenolic, anthocyan (vanillin assay) and pro-anthocyanidin (ButOH-HCl assay) content expressed in % of dry weight and Stiasny number of Okoume expressed in %.

From: The condensed tannins of Okoume (Aucoumea klaineana Pierre): A molecular structure and thermal stability study

Okoume type sample

Total phenolic content (% of dry weight)*

Vanillin assay (% of dry weight)*

ButOH-HCl assay (% of dry weight)*

Stiasny number (%)*

Bark

6 ± 0.4

4.2 ± 0.4

0.6 ± 0.1

83.3 ± 11.6

Sapwood

2 ± 0.8

0.5 ± 0.1

0.3 ± 0.04

73.3 ± 15.3

Heartwood

0.7 ± 0.1

0.2 ± 0.2

0.1 ± 0.2

53.3 ± 11.6

  1. N = 8, represents the total number of technical replicates extraction per sample type (bark, sapwood, heartwood) obtained from the two logs.
  2. *Means ± SD.
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