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山芝麻 (Helicteresangustifolia L inn.)是梧桐科 (Sterculiaceae)山芝麻属植物 ,主要分布在广东、广西、云南及长江以南各省 ,用以治疗感冒发热、麻疹、疟疾和疔疮等症 [1] .王明时等 [2 ,3]曾从该植物中分离出 3个三萜类化合物和 1个萘醌化合物 .为进一步寻找有效成分 ,我们从山芝麻中又分离到 2个新的三萜化合物 1和 2 ,用波谱方法测定了其化学结构 .1 实验部分1 .1 仪器与材料 北京泰克仪器公司的双目镜 X-6型显微熔点仪 ;EQUINOX-55(Bruker)红外光谱仪 ;Varian Unity INOVA 50 0型核磁共振仪 (TMS为内标 ) ;VG Autospec-… 相似文献
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海绵甾类化合物研究(Ⅰ)::海绵Aplysillasp.中的甾类化合物 总被引:2,自引:0,他引:2
采用GC-MS法分离分析海绵Aplysillasp.中的甾类混合物。应用质谱裂解规律结合计算机检索确定了十一种甾体成分的结构。 相似文献
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乌骨藤中五环三萜类化合物的分离鉴定 总被引:2,自引:0,他引:2
利用硅胶柱色谱法、Sephadex LH-20凝胶柱色谱法及半制备高效液相色谱法,从乌骨藤的正丁醇萃取物中分离得到4种五环三萜类化合物。利用核磁共振谱、质谱、红外光谱等分析方法对化合物结构进行了分析和表征,确定了4种化合物分别为β-香树脂醇(β-amyrin)、白桦酯醇(betulin)、白桦酯酸(betulinic acid)和羽扇豆醇(lupeol),它们为首次在牛奶菜属植物中发现,其中后3种化合物具有抗肿瘤活性。 相似文献
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采用气相色谱-质谱联用技术(GC-MS)与核磁共振氢谱(1H-NMR)相结合的方法,对中国黄海肾指海绵属新种海绵Reniochalina sp.中的低极性组分进行了研究。实验首先采用环己烷对海绵进行提取,然后将提取液浓缩,用硅胶柱对其进行柱色谱分离。取乙酸乙酯-环己烷(体积比为1∶9)混合液梯度洗脱所得油状物用于连续两次制备色谱分离,得到两个样品,对其进行1H-NMR及GC-MS分析。此次实验共从该海绵中分离鉴定出10种链烃、2种脂肪酸、2种脂肪酸酯、邻苯二甲酸以及3种邻苯二甲酸二酯共18种化学成分。该研 相似文献
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海绵甾类化合物研究(Ⅰ):海锦Aplysilla sp.中的甾类化合物 总被引:1,自引:0,他引:1
采用GC-MS法分离分析海绵Aplysillasp.中的甾类混合物。应用质谱裂解规律结合计算机检索确定了十一种甾体成分的结构。 相似文献
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翅子树叶中的三萜化合物 总被引:3,自引:0,他引:3
翅子树(Pterospermum lanceaefolium Roxb)为梧桐科(Sterculiaceae)植物,民间用其叶作止血、抗菌药。初步药理试验表明,翅子树叶的乙醇提取物育较强的抑制大肠杆菌生长和缩短小白鼠凝血时间的作用。翅子树叶的化学成分尚未见报道。本文对其化学成分进行了研究,从酯溶部分中获得新三萜sterculin-A(Ⅰ)和2个已知的甾醇。 相似文献
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An undescribed Taiwanese marine sponge of the genus Parahigginsia yielded two new sesquiterpene hydrocarbons-parahigginine ( 1 ) and parahigginone ( 2 ). The structures of the new compounds were established on the basis of NMR spectroscopic and mass spectrometric data. Compounds 1 and 2 exhibited moderate cytotoxicity against murine P-388 and human KB-16, A-549, and HT-29 tumor cells. 相似文献
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A Novel Pyrrololactam Alkaloid from the South China Sea Sponge Phacellia Fusca Schmidt 总被引:1,自引:0,他引:1
Florecita De Guzman Francis J. Schmitz M. Bilayet Hossain Dick van der Helm 《高等学校化学研究》1991,7(3):178-180
Pyrrololactam type of alkaloids was found in many marine sponges which belong to the family Axinellidae. In the course of our systematic research for bioactive substances in marine organisms, we studied the sponge Phacellia fusca Schmidt which also belongs to the family Axinelldae. From the chloroform-soluble fraction, ten A-nor-sterols were isolated and identified, while from the water-soluble portion, three known pyrrololactam alkaloids and a new pyrrololactam alkaloid, which was named fuscin, were obtained. The present paper contains the isolation and structure determination of fuscin (1). 相似文献
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具有Scalarane碳架的二倍半萜以及C-20甲基化或C-20和C-24双甲基化的Scalarane型高二萜半萜是Dictyoceratida科海绵的典型代谢产物。海绵Phyllospongia foliascens属Dictyoceratida科,从这种海绵中我们已分离和测定了7种双高二倍半萜的结构,作为对这种海绵深入研究的一部分,我们对采自西沙和南沙群岛的同种海绵进行了研究,从中得到Acetoxy phyllofoldctone A(1).本文报道(1)的分离及结构测定. 相似文献
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Zhongbin Cheng Dong Liu Nicole J. de Voogd Peter Proksch Wenhan Lin 《Helvetica chimica acta》2016,99(8):588-596
Chemical examination of a marine sponge Xestospongia sp. resulted in the isolation of 20 sterol derivatives ( 1 – 20 ), including eight new sterols namely aragusterols J – L ( 1 – 3 ), (5α,7α,12β,22E)‐7,12,18‐trihydroxystigmast‐22‐en‐3‐one ( 4 ), (5α,7α,12β,24R)‐ and (5α,7α,12β,24S)‐7,12,20‐trihydroxystigmastan‐3‐one ( 5 / 6 ), and (5α,7α,12β,22E,24R)‐ and (5α,7α,12β,22E,24S)‐7,12,20‐trihydroxyergost‐22‐en‐3‐one ( 7 / 8 ). The structures of new compounds were determined through extensive spectroscopic analyses and chemical conversion. The sterol diversity was mainly characterized by the presence of a cyclopropane unit at side chain, while compound 4 with 18‐hydroxymethyl group was found in stigmasterol family for the first time. Cytotoxic test revealed the inhibitory effects of compounds 1 , 4 , and 17 against human leukemia cell line K562 with IC50 values of 18.3, 24.1, and 34.3 μm , respectively. 相似文献
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AbstractA new thiodiketopiperzaine, tedanizaine A (1), together with six known ones, were isolated from the marine sponge Tedania sp. Their structures were determined by spectroscopic analyses. The absolute configuration of 1 was established by ECD calculation. Compound 1 was the second example of thiodiketopiperazine bearing a thiazolidine unit. Cytotoxic activities of 1 were also evaluated. 相似文献