The polymeric tannins of TSH were confirmed as
polymeric PA (condensed tannin), which did not contain
galloylated derivatives with a higher content of PD in the
B ring than GSE. The average DP of acTSE was shown.
However, the detailed chemical structure of the polymeric
tannins from TSH should be elucidated by further studies
by gel permeation chromatography and phloroglucinol or
thiolysis reaction to confirm the constituent units and
interflavonoid linkage. The potent antioxidant activity of
the polymeric PA of TSE was also shown.