86703-07-3Relevant academic research and scientific papers
Tannins and Related Compounds. Part 9. Isolation and Characterization of Polygalloylglucoses from Turkish Galls (Quercus infectoria)
Nishizawa, Makoto,Yamagishi, Takashi,Nonaka, Gen-ichiro,Nishioka, Itsuo
, p. 961 - 965 (2007/10/02)
Two structural isomers of pentagalloylglucose and four isomers of hexagalloylglucose have beem isolated from Turkish galls (Quercus infectoria), in addition to 1,2,3,6-tetra-O-galloyl-β-D-glucose (2), and their structures were established on the basis of (13)C n.m.r. analysis, methanolysis, and partial hydrolysis.Trihepta-, and octa-galloylglucoses were partially purified, and their structures were also characterized mainly by (13)C n.m.r. spectroscopy.From the isolation and structural studies of these galloylglucoses Turkish gallotannin has been shown to be a mixture of two types of polygalloylglucoses; one type has a 1,2,3,6-tetra-O-galloyl-β-D-glucose core with depside galloyl group(s) at the C-2 and/or C-6 position of the glucose moiety, and the other has a 1,2,3,4,6-penta-O-galloyl-β-D-glucose core with depside galloyl group(s) randomly distributed at the C-2, -3, -4, and -6 positions.H.p.l.c. analysis showed that Turkish gallotannin has an average molecular weight of 1 032 and the composition ranges from tri- to nona-galloylglucoses.
