Biology Reference
In-Depth Information
i
) Macrocyclic ellagitannin dimers,
e.g.
, oenothein B and woodfordin C.
ii
) Macrocyclic ellagitannin trimers,
e.g.
, oenothein A and woodfordin D.
iii
) Macrocyclic dehydroellagitannin dimers,
e.g.
, eugeniflorin D
2
from
Eugenia uniflora
.
OH
HO
O
O
O
HO
HO
O
OH
O
O
O
O
O
OH
O
OH
HO
O
OH
OH
O
OH
HO
HO
O
OH
O
HO
O
OH
OH
O
O
HO
O
O
O
Eugeniflorin D
2
HO
OH
O
OH
HO
OH
Geraniales
Geraniaceae
Geranium
: I, III, IV
Euphorbiales
Euphorbiaceae
Alchornea
: III, III+
Aleurites
: III, III+, IV
Antidesma
: III, III+
Euphorbia
: I, II, II+, III, III+, IV
Excoecaria
: I, II, II+, III, III+
Macaranga
: I, II, III, IV
Mallotus
: I, I+, II+, III, III+, IV
Phyllanthus
: I, II, III, IV
Fig. 1.10
Ellagitannins types in Geraniales and Euphorbiales plant orders.
1.4.3 Isolation of oxidized ellagitannin oligomers in specific plant
orders
Highly oxidized ellagitannin dimers of types III, III+ and IV have been
isolated from euphorbiaceous plants in Euphorbiales, besides from
Geraniaceae
in Geraniales (Fig. 1.10). Euphorbin E from
Euphorbia
hirta
, composed of geraniin and oxidized isoterchebin molecules
(Yoshida,
et al
., 1990c), acalyphidin D
1
(Amakura,
et al.
, 1999)
composed of two geraniin molecules with an oxidized linking unit, and
eurobustin C (Hatano
et al.
, unpublished data) from
E. robusta
, a
