You are here: Home
/ Publication Information
Title: The phenolic extractives in southern red oak (Quercus falcata Michx. var. falcata)
Author: Ohara, Seiji; Hemingway, Richard W.;
Source: Holzforschung 43(3):149-154
Publication Series: Miscellaneous Publication
Description: The bark of southern red oak (Quercus falcala Michx. var. falcala) is a rich source of quercitrin (quercetin-3-rhamnoside). It contains only low concentrations of (+)-catechin and no significant amounts of epicatechin or gallocatechin. The three major dimeric proanthocyanidins present are epicatechin-(4β→8)-catechin, catechin-(4α→8)-catechin and the 3-gallate ester of epicatechin-(4β→8)-catechin. No biphenyl-linked dimers and no flavan-3-ol- or proanthocyanidin-glycosides are evident. The higher molecular weight acetone-water soluble tannins are polymeric procyanidins predominantly made up of 2,3-cis chain extender units and terminated with the 2,3-trans (+)-catechin. The polymers contain only small amounts of 2,3-trans procyanidins chain extender units and only traces of prodelphinidin units. Although a gallate ester of a dimer is present in significant amounts, neither gallate esters of higher molecular weight procyandins nor hydrolysable tannins are detectable through reaction products or IR and 13C-NMR spectral studies.
Keywords: Red oak, bark, flavonoids, tannins, proanthocyanidins, gallate esters
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
XML: View XML
Ohara, Seiji; Hemingway, Richard W. 1989. The phenolic extractives in southern red oak (Quercus falcata Michx. var. falcata). Holzforschung 43(3):149-154
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility