UDC 547.972The catechin and proanthocyanidin compositions of the leaves and bark of Ziziphus jujuba have been studied over the vegetation periods. This has led
The bark of English oak (Quercus robur) contains about 13-15% of tanning substances and has long been used for tanning hides. It is used in folk and scientific medicines as an astringent in looseness and bleeding of the gums. There are reports in the literature of a chemical study of the proanthocyanidins of the bark of Quercus robur [1][2][3][4] and of species with similar chemical compositions, Q. dentata and Q. miyagii [5, 6]. With the aim of finding new biologically active compounds, we have studied the proanthocyanidins of the bark of Q. robur L. fam. Fagaceae, growing on the territory of the CIS.From a total aqueous alcoholic extract of the oak bark, by partition chromatography on microcrystalline cellulose powder and gel filtration on Sephadex LH-20 we have isolated more than 20 compounds: catechins and low-molecular-mass, oligomeric, and polymeric proanthocyanidins.
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