- A
gallotannin is any of a
class of
molecules belonging to the
hydrolysable tannins.
Gallotannins are
polymers formed when
gallic acid, a
polyphenol monomer...
-
Ellagitannins differ from
gallotannins, in that
their galloyl groups are
linked through C-C bonds,
whereas the
galloyl groups in
gallotannins are
linked by depside...
-
gallic acid does not
contain gallium.
Gallic acid is
easily freed from
gallotannins by
acidic or
alkaline hydrolysis. When
heated with
concentrated sulfuric...
- the most
useful trees in India. Its
leaves contain large amounts of
gallotannins, and are used in
India for
tanning and firewood. The tree is the source...
-
species that are
called Chinese gall (Galla chinensis), are a
source of
gallotannins,
molecules of
hydrolyzable tannins.
Infestation of the tree by Chinese...
-
degradation of
gallotannins. This is important,
because some
microorganisms use
tannase to
breakdown hydrolysable tannins, such as
gallotannins, to form glucose...
- for
gallotannins and analogs.
Flavonoids and
caffeic acid
derivatives are
biosynthesized from
phenylalanine and malonyl-CoA.
Complex gallotannins develop...
-
partially or
totally esterified with
phenolic groups such as
gallic acid in
gallotannins or
ellagic acid in ellagitannins.
Hydrolysable tannins are
mixtures of...
-
Tannase is an
enzyme that
Nierenstein used to
produce m-digallic acid from
gallotannins. He
proved the
presence of
catechin in
cocoa beans in 1931. He showed...
- 1,6-Digalloyl glucose, a
gallotannin found in
species of oak 2,6-digalloyl
glucose and 3,6-digalloyl glucose,
gallotannins found in
galls of Tamarix...
