Biology Reference
In-Depth Information
1983a), are widely distributed in various plant species of
Casuarinaceae
,
Stachyuraceae
,
Myrtaceae
,
Betulaceae
,
Fagaceae
,
Hamamelidaceae
,
Lythraceae
,
Punicaceae
,
Melastomataceae
,
Rosaceae
,
Elaeagnaceae
,
Theaceae
and
Juglandaceae
families (Okuda
et al
., 1982h). Castalagin
and vescalagin were found in the woody
Castanea
and
Quercus
species
(Mayer, 1971). The so-called complex tannins, which commonly referred
to ellagitannins having a flavanol-based motif linked to C-1 of the
glucose core through a C-C bond, occur in some species of
Fagaceae
,
Combretaceae
,
Myrtaceae
,
Theaceae
and
Melastomataceae
, and
constitute a subclass of
C
-glycosidic ellagitannins (Yoshida
et al
.,
1992a).
HO
HO
HO
OH
HO
OH
HO
HO
O
O
HO
O
O
HO
O
O
O
O
HO
R
2
R
2
HO
R1
R
1
O
O
O
O
O
OH
O
O
O
OH
HO
HO
O
O
O
O
HO
HO
OH
OH
OH
HO
OH
OH
OH
HO
OH
HO
HO
HO
Casuarinin : R
1
= H, R
2
= OH
Stachyurin : R
1
= OH, R
2
= H
Castalagin : R
1
= H, R
2
= OH
Vescalagin : R
1
= OH, R
2
= H
HO
OH
HO
HO
OH
HO
OH
O
O
HO
O
O
O
HO
H
OH
O
OH
O
O
OH
HO
Camelliatannin A
O
OH
OH
HO
OH
HO
