The objectives of this research were to isolate and
determine the molecular structures of certain polyphenols
in Douglas-fir and red alder barks. The compounds of
interest in Douglas-fir were the lignans which are
eventually incorporated into the outer bark phlobaphenes.
Phlobaphenes are the red colored, alcohol soluble, water
insoluble phenolic...
The most active phenolics in Quercus sideroxyla Humb. & Bonpl. residual bark were identified and evaluated following a chromatographic fractionation. Bark powder was defatted with hexane and crude extract (CE) was obtained by extraction with aqueous acetone (70%). A liquid partition with ethyl acetate was performed to produce an organic...