【摘 要】
:
Objective To study the chemical constituents ofPronephrium triphyllum.Methods The chemical constituents in the plant were isolated and purified with silica gel
【机 构】
:
Zhongshan Hospital of Traditional Chinese Medicine Affiliated to Guangzhou University of Chinese Med
【基金项目】
:
Science and Technology Project of Zhongshan,China
论文部分内容阅读
Objective To study the chemical constituents ofPronephrium triphyllum.Methods The chemical constituents in the plant were isolated and purified with silica gel and Sephadex LH-20.Their structures were identified by analyses of spectral data and physicochemical properties.Results Six compounds were isolated and identified as shelincaoide A(1),n-butyl-13-D-fructopyranoside(2),triphyllin A(3),6,7-di-hydroxycoumarin(4),daucosterol(5),and 13-sitosterol(6),respectively.Conclusion Compound 1 is found to be a new compound.Compounds 2 and 4 are firstly isolated from the plants in Pronephrium Presl.and all compotmds except 3 are obtained from the species for the first time.
其他文献
文言文的趣味教学以兴趣为激发点,以了解中华民族博大精深的传统文化、培养民族自豪感为终极目的,力求寻找应试教育与品德教育的最佳结合点.
把信息技术应用于化学实验教学中,克服实验条件的限制,旨在对以下几个方面有所突破:提高演示实验的可见度性、增加演示实验的时效性、保障演示实验的安全性、加强学生实验操
相控阵声束的聚焦受换能器频率、孔径、阵元尺寸、焦距以及扫查角度等诸多参数的影响,且各参数之间具有复杂的相互关联和制约关系。本文基于相控阵超声声束形成及聚焦原理,采
数学应用与数学知识学习是相互促进、相辅相成的,在数学教学中加强数学应用和联系实际,不但有利于提高学生的数学学习兴趣,加强学生的应用意识,而且有利于学生的数学理解,提高学生
本文通过对《平面向量的坐标表示》问题情境的三次不同设计的对比,指出了什么样的问题情境是最有效的。
配料方法①土豆糖化:将土豆洗净,煮熟捣碎,每50千克土豆加凉水30千克,升温至25℃,拌入扩大曲和醋用发酵剂,搅匀后倒入缸内盖好进行糖化,12小时后开始起泡。每天用木棰上下均匀搅动,至
当三聚氰胺掺入奶粉,流入市场,使很多可爱的小生命的健康受到摧残;当化工厂的滚滚浓烟冲向蔚蓝的天空,使飞鸟绝迹;当股股污水排人清澈的河流,使鱼虾死亡,青草枯黄……我们领教了无数
From the point of view of an opticist, the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) marks a miracle-like milestone. It integrates a lot
在小学数学解决问题教学中,学生经常错误百出。分析其中原因,排除教学和学习这两方面的因素,多数是由于学生审题不仔细、粗心、马虎造成的。如何帮助学生克服这些坏习惯,培养
为利用硝酸分解大峪口磷矿生产磷肥,通过单因素实验考察各种因素对磷矿粉分解率的影响,实验筛选出便于过滤、结晶等后续工序有效进行的酸解反应最佳工艺条件:硝酸用量为理论