Ethanolysis reactions were conducted on the flavonoids, such
as, catechin, quercetin and dihydroquercetin, and polymeric phenolic
components from conifer barks, such as, mountain hemlock phlobatannin
and Douglas-fir phlobaphene with the object of ascertaining
their chemical relationship. These reactions were carried out with
absolute ethanol in the presence of 2.5% hydrogen...
In these tests, phenolic constituents from bark of Shasta red fir were found ineffective as stiffening agents for corrugating medium. Other means of application, however, may be effective.
Gum from inner bark of Shasta red fir was not so effective as a beater additive as was locust bean gum, but...
This is the first detailed chromatographic examination of Pseudotsuga menzesii and three other Pseudotsuga species (P. macrocarpa, P. japonica, and P. wilsoniana). The whole bark of these four species was sequentially extracted with hexane, benzene, ethyl ether, ethyl alcohol and water. Paper and thin layer chromatographic techniques were coupled with...
