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薛天乐 《安徽科技学院学报》2017,31(2)
目的:研究白芷叶总香豆素最佳提取工艺和其清除羟自由基活性的能力。方法:应用单因素和正交实验法研究白芷叶总香豆素的最佳提取工艺,应用紫外分光光度法研究其清除羟自由基活性的能力。结果:最佳提取工艺为乙醇浓度为80%,液料比为40∶1,温度为70℃,时间为1.5 h,其中乙醇浓度对提取率有显著影响(P0.05)。采用最佳提取工艺提取白芷叶总香豆素,提取率可达1.10%。白芷叶总香豆素对羟自由基的最大清除率为73.8%,EC50=334.5μg/m L。结论:该工艺可以用于白芷叶总香豆素的提取,白芷叶总香豆素具有较强的清除羟自由基活性的能力。 相似文献
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蔡伟潭 《语文世界(高中版)》2010,(4)
省试湘灵鼓瑟钱起善鼓云和瑟,常闻帝子灵。冯夷空自舞,楚客不堪听。苦调凄金石,清音入杳冥。苍梧来怨慕,白芷动芳馨。流水传湘浦,悲风过洞庭。曲终人不见,江上数峰青。 相似文献
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The present paper deals mainly with the karyotype analysis of five
materials in Angelica dahurica collected in Yanbian of Jilin, Anguo of Hebei, Yuxian of
Henan, Hangzhou of Zhejiang and Suining of Sichuan. They are under the names
“Dongbeidahuo”, “Qibaizhi”, “Yubaizhi”, ”Hangbaizhi” and “Chuanbaizhi” respe-
ctively. Among then “Dongbeidahuo” is a wild plant, which occurs in northeastern
China, and the others are cultivated as important crude drugs in some provinces. “Qi-
Baizhi” and “Yubaizhi” have been identified as conspecific with the wild Baizhi-“Do-
Ngbeidahuo” (A. dahurica) according to the external morphological features, whereas the
other cultivated ones, “Hangbaizhi” and “Chuanbaizhi”, treated as a variety (A. dahu-
rica var. formosana).
The results of karyotype analysis are shown in Plate 1, 2, with the formula 2n=22
=12 m+2 mSAT+4sm+4st. The karyotypes described here are constantly characterized by
satellites attached to the fourth pair of metacentric chromosomes and differ from the pu-
blished reports on the other species of the genus. It is reasonable to say that the five
materials collectively named “Baizhi” are taxonomically closely related to each other
and could be regarded as conspecific. Since the second chromosome pair is submetacen-
tric in “Dongbeidahuo”, it may be justifiable to separate the wild plant from the cul-
tivated ones and treat them as two separate varieties. 相似文献
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