排序方式: 共有24条查询结果,搜索用时 15 毫秒
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新鄂西香茶菜素为首次从抗癌中草药鄂西香茶菜[Rabdosia henryi (Hemsl) Hara]的叶子中分离得到的二萜化合物。前人曾从毛叶香茶菜[R. japonica (Burm. f)Hara]中分离出该化合物并依据光谱数据推测其结构(右图)。但其结晶学研究尚未见报道。为研究其立体结构及分子在晶体中的排布方式,我们对该化合物的晶体进行了X射线结构分析。 相似文献
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从采自西藏的皱叶香茶菜中分离鉴定了3对B-闭联对映贝壳杉烯型二萜化合物:二萜化合物皱叶香茶菜素(Ⅰ)和二氢皱叶香茶菜素(Ⅱ);isodocarpin(Ⅲ)和dihydroisodocarpin(Ⅳ)及Carpalasionin(Ⅴ)和dihydrocarpalasionin(Ⅵ)。(Ⅰ)、(Ⅲ)和(Ⅴ)分别与对应的二氢化合物(Ⅱ)、(Ⅳ)和(Ⅵ)以混合物的形式被分离和鉴定。化合物(Ⅱ)为新化合物,(Ⅰ)、(Ⅳ)和(Ⅵ)首次在自然界发现,(Ⅲ)和(Ⅴ)为已知化合物。 相似文献
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TANG Jian MA Rui-li LI Qian-qian JIANG Chun-bao CHEN Rui OUYANG Zhen CHEN Hai-sheng 《高等学校化学研究》2013,(6):1072-1077
For the efficient extraction of kamebakaurin(KA), the ultrasound-assisted extraction(UAE) of KA from Rabdosia excisa(R, excisa) via response surface methodology(RSM) was investigated with high-performance liquid chromatography(HPLC). Effects of the experimental parameters such as extraction solvent, ratio of liquid to plant material, extraction time and extraction temperature on the extracting efficiency of KA from R. excisa were evaluated, and the purity of KA in residual was calculated. The optimized conditions were 65.5%(volume fraction) acetone, 35 ℃, time of 24.6 min with ultrasound of 80 W/L, 40 kHz, ratio of liquid to plant material at 30:1(mL/g). The maximum yield of KA is 0.708 mg/kg, with mean purity of 6.09%, indicating that ultrasound-assisted extraction is a feasible and useful method for extracting KA from R. excisa. 相似文献
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ZHANG Rong-PingKunming Medical College Kunming Yunnan ChinaSUN Han-DongKunming Institute of Botany Chinese Academy of Sciences Kunming Yunnan China 《中国化学》1997,15(5):425-430
Two new ent-kaurene diterpenoids, angustifolin B and natural hydrogen-bonded 1:1 complex, angustifolin C, as well as four known diterpenoids, angustifolin, isodonal, sodoponin, tri-chorabdal B, were isolated from the leaves of Rabdosia angustifolia. 相似文献
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长管香茶菜B(LongikaurinB)分子的化学计量式为C22H30O7,Mr=406.47,用X射线衍射法确定其晶体结构,该结晶是无色透明柱状,属单斜晶系,空间和群为P21,晶胞参数:a=11.893(2),b=6.380(2),c=13.205(2)A,β=99.39(2)°,Z=2,V=988.5(4)A3,Dc=1.366g/cm3,F(000)=436,u=0.9cm-1。应用直接法解析分子结构,以最小二乘法修正结构参数。最终可靠因子R=0.042,Ra=0.043。结果表明,该化合物为长管香茶菜B,属7,20-氧桥-对映-贝壳杉烯型工花化合物。结构与功能关系研究表明LongikaurinB化合物可能具有抗肿瘤生物活性。 相似文献
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中草药溪黄草低极性组份的研究 总被引:1,自引:0,他引:1
1前言溪黄草(Rabdosia.serra(Maxim.)Hara)属于唇形科香茶菜属植物,是一种多年生草本植物。据中华大辞典记载,其具有清热祛湿,凉血散瘀之功效,对急性肝炎,肠炎,痢疾等有较好效果。但是该植物化学组成的研究目前在国外尚未有报道,国内研究报道有4篇卜’1。共分出8个化合物:RabdoserrinA,RabdoserrinB,BxclsanlnA,Kamebakaunn,Za一羟基乌索酸,乌索酸,卜谷自醇及一p谷尚醇一D一葡萄糖贰。该植物的石油醚提取层的化学组分未见报道。我们利用高… 相似文献
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Two new diterpenoids from Rabdosia japonica var.glaucocalyx 总被引:1,自引:0,他引:1
Two new diterpenoids, named glaucocalyxin F and glaucocalyxin X, respectively, were isolated from the whole plant of Rabdosia japonica (Burm. f.) Hara var. glaucocalyx (Maxim.) Hara. Their structures was established on the basis of spectral analysis. 相似文献
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