Ellagitannins extraction

Test-tube or animal studies of pomegranate juice or its ellagitannin extracts have shown significant activity in the following areas of disease investigation ... 

The separation characteristics of unmodified silica, diol, cyano, cellulose and RP-18 stationary phases were compared for the analysis of ellagitannins, gallotannins and flavonoid glycosides in the aerial parts of Erodium cicutarum (Geraniaceae) (stork s bill). Its decoction has been used in cases of dysentery, fever, wounds and worm infections. The air-dried and powdered plant material (300 g) was extracted three times with water-acetone (1 1, v/v) at ambient temperature. The collected extract was filtered and concentrated. The aqueous phase was acidified to pH 3 with formic acid and separated in an ODS column. Polphenols... 

Extracts of plants have been used as insecticides by humans since before the time of the Romans. Some of these extracts have yielded compounds useful as sources (e.g., pyrethrins, rotenoids, alkaloids), others as models (e.g., pyrethrins, physostigmine) of commercial insecticides. Recent technological advances which facilitate the isolation and identification of the bioactive constituents of plants should ensure the continued usefulness of plant compounds in commercial insect control, both as sources and models of new insect control agents and also as components in host plant resistance mechanisms. The focus in this paper will be on several classes of compounds, including limonoids, chromenes, ellagitannins, and methyl ketones, which were found to be components of the natural defenses of both wild and cultivated plants and which may be useful in commercial insect control. 

Since the phenolic substance extracted from oak heartwood are predominantly gallo- or ellagitannins and lignin derivatives which are not... 

Ellagitannins are among the most diverse and structurally complex class of polyphenolics in plants. They are important contributors to color, flavor and stability in fruits as well as oaked wine and distilled spirits. Recently, consumption of ellagitannins has also been linked to potential health benefits. The extraction, isolation, and identification... 

Saucier, C. Jourdes, M. Glorida, Y. Quideau, S. 2006. Extraction, detection, and quantification of flavano-ellagitannins and ethylvescalagin in a bordeaux red wine aged in oak barrels. J. Agric. Food Chem. 54 7349-7354. 

The remaining wood components make up the fraction that can be extracted with different solvents, mainly comprising volatile and non-volatile acids, sugars, steroids, hydrolysable tannins (ellagitannins), volatile phenols, terpenes, lactones, etc. This review will deal with the volatile components that can leach out into the wine during barrel aging and as a result may affect the sensory attributes of wine. 

FeuiUat, R, Moio, L., Guichard, E., Marinov, M., Fournier, N., Puech, J. L. (1997). Variation in the concentration of ellagitannins and cis- and rrani-/i-methyl-y-octalactone extracted from oak wood (Quercus robur L., Quercus petraea Liebl.) under model wine cask conditions. Am. J. Enol. Vitic., 48, 509-515. 

Other electrophiles include anthocyanin flavylium cations. The intermediate cation generated, in mildly acidic conditions, from vescalagin, an ellagitannin present in wines after barrel aging or addition of oak chips and tannin extracts, has also been shown to participate to such reactions (Quideau et al. 2003). 

Ellagitannins, phenolic compounds extracted from wood, enhance color stability and reduce the astringency of red wine by favoring anthocyanin-tannin... 

---