毛细管电泳紫外检测法测定莲须中的槲皮素、木犀草素、山萘酚、异槲皮甙

采用毛细管区带电泳紫外检测法(CZE-UV)同时测定中药莲须中槲皮素、木犀草素、山萘酚、异槲皮甙4种有效成分.研究了缓冲溶液的离子浓度、pH值和电压对分离度和迁移时间的影响,得到了最佳分离实验条件.在离子浓度为40 mmol/L Na2B4O7缓冲溶液(pH 9.0)中,分离电压为16 kV,波长为254 nm时,槲皮素、木犀草素、山萘酚、异槲皮甙4种物质在10 min内得到了良好的分离测定,其检出限分别为5.0、6.7、4.5和6.0 mg/L.本方法应用于实际样品的测定,结果令人满意.     

鬼灯擎根茎中丹宁及多元酚类化合物的分离与鉴定（I）

采用室温组织破碎提取、闪蒸浓缩及ＤｉａｉｏｎＨＰ—２０和ＴｏｙｏｐｅａｒＩＨＷ—４０反复柱层析，从鬼灯擎根茎的７０％Ｍｅ＿２ＣＯ提取物中分离得到三种酚性化合物，称ＲＡ—Ｉ～Ⅲ，经化学反应及１￣ＨＮＭＲ，（１３）￣ＣＮＭＲ分析，确定该三种化合物分别是岩白菜素（ｂｅｒｇｅｎｉｎ，ＲＡ—Ⅱ，１），（＋）—儿茶素（ｃａｔｅｃｈｉｎ，ＲＡ—Ⅱ，２）和原花色甙元Ｂ—２单没食子酸酯（ｐｒｏｃｙａｎｉｄｉｎＢ—２ｍｏｎｏｇａｌｌａｔｅ，ＲＡ—Ⅲ，３）。ＲＡ—Ⅱ及ＲＡ—Ⅲ为首次从该植物中得到。     

山光杜鹃化学成分研究

从山光杜鹃中分离得到４个二萜成分和一个酚甙，根据光谱法和文献比较分别鉴定为：木藜毒素，－Ⅰ（Ⅰ），木藜芦毒素－Ⅳ（Ⅱ），５，６－异丙叉基木藜芦毒素－Ⅰ（Ⅲ），５，６－异丙叉基本藜芦毒素－Ⅳ（Ⅳ），自桦甙（Ⅴ），其中Ⅲ和Ⅳ为次生新化合物。     

苯丙素甙对肝微粒体脂质过氧化的抑制作用

研究了六种从马先蒿中草药中分离提取得到的苯丙素甙化合物对脂质过氧化的抑制作用。它们对肝微粒体脂质过氧化的抑制程度与其分子中所含酚羟基的数目和空间位置存在相关性。结果表明:Isoverbascoside的抗氧化能力最强,Verbascoside,Echinoside和Pedicular-toside A次之,Cistanoside D第三,而分子中不含酚羟基的Permthge Verbascoside没有抗氧化作用。     

洞庭山枇杷的发展策略及构想

洞庭山枇杷栽培历史悠久，种质资源优势明显，品种优异果农经验丰富，有着很大的发展空间。枇杷四季常绿，冬季开花，花期长达三个月之久，果实春末夏初成熟应市，正值鲜果淡季，为休闲农业中甚有特色之果树，具有文化、生态和生产之特色。果实、叶及种子极具保健价值，具有巨大市场，果实富含谷氨酸且具清肺和胃、降气化痰之功效，枇杷叶、种子含有扁桃甙（B17）和苦杏仁甙，扁桃甙进入人体后，在胰蛋白酶作用下，分解成微量的氰化物和苯甲醛，再经过化学变化，可将成为所有慢性病原因的污浊的酸性血液净化成正常的弱碱性血液，治疗体内发生的炎症，恢复自然治愈力，该免疫赋活作用也已被承认。     

抗肾衰胶囊中黄芪甲甙的含量测定

采用双波长薄层扫描法测定抗肾衰胶囊中黄芪甲甙的含量。样品经适当提取后在硅胶板上展开 ,展开剂为氯仿 :甲醇 :水 (6 5∶35∶10 )下层 ,经扫描 (扫描条件 :λs=5 5 0 ,λr=70 0 ) ,测得样品含量为31 6 %(mg g) ,平均回收率为 10 4 5 %,RSD为 3 6 2 %。实验证明此方法简便、准确、可靠 ,能控制抗肾衰胶囊质量。     

不同频率超声对提取芸香甙成分的影响

用不同频率的超声从槐米中提取芸香甙。与热硷提取－酸沉淀法相比，此法无需加热，只需用频率为２０ｋＨｚ的超声波处理３０ｍｉｎ，提出率可提高４７．５６％，工艺简单，速度快。     

STUDIES ON INOSINE EXTRACTION BY ION EXCHANGE METHOD

The adsorption characteristics of inosine from fermentation solution on anion exchange resin under the condition of different pH,resin type are investigated.Besides,the desorption conditions are studied under different temperature.The adsorption and desorption mechanism are described to obtain the optimum technological condition of inosine extraction.     

Effects of truncated mutants of the ε subunit of chloroplast ATP synthase on the fast phase of millisecond delayed light emission of chloroplast and its ATP synthesis ability

The ε subunit of the chloroplast ATP synthase and the truncated ε mutants which lack some amino acid residues from the N-terminus or C-terminus were overexpressed in E. coil When the ε subunit or the truncated ε proteins was added to the spinach chloroplast suspension, both the intensity of the fast phase of millisecond delayed light emission (ms-DLE) and the cyclic and noncyclic photophosphorylation activity of chloroplast were enhanced. With an increase in the number of residues deleted from the N-terminus, the enhancement effect of the N-terminal truncated proteins decreased gradually. For the C-terminal truncated proteins, the enhancement effect increased gradually with an increase in the number of residues deleted from the C-terminus. Besides, the ATP synthesis activity of ε-deficient membrane reconstituted with the ε subunit or the truncated ε proteins was compared. The ATP synthesis activity of reconstituted membrane with the N-terminal truncated proteins decreased gradually as the number of residues deleted from the N-terminus increased. For the C-terminal truncated proteins, the ATP synthesis activity of reconstituted membrane increased gradually with an increase in the number of residues deleted from the C-terminus, but was still lower than that of the wild type ε protein. These results suggested that: (a) the N-terminal domain of the ε subunit of the chloroplast ATP synthase could affect the ATP synthesis activity of ATP synthase by regulating the efficiency of blocking proton leakage of ε subunit; and (b) the C-terminal domain of the ε subunit of the chloroplast ATP synthase had a subtle function in modulating the ATP synthesis ability of ATP synthase.