Hydrolysable tannins consist of a glucose molecule, either in ring (gallotannin
) or linear (ellagitannin) conformation with gallic acid residues attached to the hydroxyl groups on each carbon.
In the article titled "Interaction between Gallotannin
and a Recombinant Form of Arginine Kinase of Trypanosoma brucei: Thermodynamic and Spectrofluorimetric Evaluation" , there were a typo in Equation (7), where the denominator K2 should be corrected to K1, and an error in Table 2, where the values for [DELTA]H, [DELTA]S, and [DELTA]G were incorrectly calculated.
The total phenolic, flavonoid, flavonol, procyanidins, and gallotannin
content (Figure 3) show differences in amount depending on solvents polarities.
One of the most simple and common hydrolysable tannins is the gallotannin
with up to 12 esterified galloyl groups and a core glucose (Figure 1(a)) as the gallotannin
from Chinese natural gallnuts .
Determination of GalloTannin
content in fermented Rice bran by HPLC Sample Preparation
The major commercial application of this enzyme is in the hydrolysis of gallotannin
to gallic acid, which is an intermediate required for the synthesis of an antifolic antibacterial drug trimethoprim (Sitting et al., 1988).Tannase is extensively used in the preparation of instant tea, wine, beer, and coffee--flavored soft drinks and also as additive for detannification of food (Lekha et al., 1993).
, one of tea's components is thought to be up to 1000 times more effective than existing medicines in the treatment of brain damage in stroke patients.
and proanthocyanidin concentrations were higher in the foliage of Q.
Our aqueous tannins are unique blends of ellagitannin and gallotannin
that are entirely oak-derived and retain all of the aromatic freshness and potency of the stave quality oak while maximizing ease of application.
Suk et al., "Gallotannin
isolated from euphorbia species, 1,2,6-Tri-O-galloyl-[micro]-D-allose, decreases nitric oxide production through inhibition of nuclear factor-[kappa] >B and downstream inducible nitric oxide synthase expression in macrophages," Biological and Pharmaceutical Bulletin, vol.
indica) extracts against some microorganisms (Gram-positive and Gram-negative bacteria and Candida albicans yeast) have already been demonstrated [38, 63] and it is thought that the antibacterial activity of mango extract is due to the presence of gallotannin
and mangiferin .
content was calculated by subtraction of the results of non-hydrolyzed from hydrolyzed samples.