桉树皮单宁分析

对广西高峰林场桃源分厂4年生的大叶桉和尾叶桉树皮的单宁含量进行了分析,并分别进行了栲胶的试制。分析结果表明:大叶桉和尾叶桉树皮单宁属于缩合类单宁,树皮单宁含量分别为7.6%和7.8%,纯度分别为67.9%和70.3%;大叶桉树皮栲胶单宁含量为65.4%,尾叶桉树皮栲胶单宁含量为63.3%。桉树皮可作为新品种栲胶原料,其栲胶值得推广应用。

Analysis of Tannins of Eucalyptus Bark

The tannins content in the bark of 4 ages Eucalyptus robusta Smith and E.urophylla in the Guangxi Gaofeng Wood Farm were determined. The vegetable tannin extracts were prepared. It was found that the tannins of the E.robusta Smith and E.urophylla belong to condensed tannins. The tannin content of bark are 7.6% and 7.8%, respectively, the purity are 67.9% and 70.3%;the tannin content of the E.robusta Smith bark extract is 65.4%, and E.urophylla bark extract is 63.3%.The Eucalyptus bark can been used as the new raw material of tannin extract, its tannin extract is worth of promoting and using.