Tergallic acids are
trimers of
gallic acid
Gallic acid (also known as 3,4,5-trihydroxybenzoic acid) is a trihydroxybenzoic acid with the formula C6 H2( OH)3CO2H. It is classified as a phenolic acid. It is found in gallnuts, sumac, witch hazel, tea leaves, oak bark, and other plants. It i ...
, often found naturally in the form of
glycoside
In chemistry, a glycoside is a molecule in which a sugar is bound to another functional group via a glycosidic bond. Glycosides play numerous important roles in living organisms. Many plants store chemicals in the form of inactive glycosides. ...
s. Tergallic acid
O- or
C-glucosides that can be found in acorns of several ''
Quercus
An oak is a tree or shrub in the genus ''Quercus'' (; Latin "oak tree") of the beech family, Fagaceae. There are approximately 500 extant species of oaks. The common name "oak" also appears in the names of species in related genera, notably '' ...
'' (oak) species.
The
dehydrated tergallic acid C-glucoside and tergallic acid O-glucoside can be characterised in the acorns of ''
Quercus macrocarpa
''Quercus macrocarpa'', the bur oak or burr oak, is a species of oak tree native to eastern North America. It is in the white oak section, ''Quercus'' sect. ''Quercus'', and is also called mossycup oak, mossycup white oak, blue oak, or scrub oa ...
''.
(m/z 613) can be found in the cork from ''
Quercus suber''.
Tergallic acid glucosides can also be found in ''
Terminalia chebula
''Terminalia chebula'', commonly known as black- or chebulic myrobalan, is a species of ''Terminalia'', native to South Asia from India and Nepal east to southwest China (Yunnan), and south to Sri Lanka, Malaysia, and Vietnam.Flora of China''Term ...
''.
Tergallic acid dilactone can be found in ''
Rhynchosia volubilis
''Rhynchosia volubilis'' is a plant species in the genus '' Rhynchosia''.
Tergallic acid dilactone can be found in ''R. volubilis'' seeds.
References
External links
volubilis
Volubilis (; ar, وليلي, walīlī; ber, ⵡⵍⵉ ...
'' seeds.
The chemical formula is not the same as given by Kinjo ''et al.''
[ (molecule with an ether link between the ellagic and gallic acid residues) or by Cantos,][ Chapman][ and Fernandes ''et al.''][ (molecule with a carbon-carbon link). Cantos, Fernandes and Chapman called the molecule with an ether link ]valoneic acid dilactone
Valoneic acid dilactone is a hydrolysable tannin that can be isolated from the heartwood of ''Shorea laevifolia''5A-Reductase inhibitory tannin-related compounds isolated from Shorea laevifolia. Yoshio Hirano, Ryuichiro Kondo and Kokki Sakai, Jour ...
while Kinjo and Shuaibu ''et al.''flavogallonic acid dilactone
Flavogallonic acid dilactone is a hydrolysable tannin that can be found in '' Rhynchosia volubilis'' seeds, in '' Shorea laevifolia'', in ''Anogeissus leiocarpus'' and ''Terminalia avicennoides
''Terminalia avicennioides'' ( bm, Wolobugun) is a ...
.
References
Ellagitannins
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