排序方式: 共有138条查询结果,搜索用时 15 毫秒
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蛇床子对土壤中七种金属元素选择性富集作用研究 总被引:3,自引:0,他引:3
采用火焰原子吸收分光光度法对十个产地的蛇床子及其植物根部土壤中的七种金属元素的含量进行了测定,通过比较对该植物对这七种金属元素的选择性富集作用进行了讨论。 相似文献
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用色谱-质谱方法鉴定薄荷油中的异构体 总被引:7,自引:0,他引:7
用毛细管气相色谱-质谱联用、程序升温方法分析了一种薄荷油的化学成分、共分离出20个组分,其中含4组异构体,它们分别是:m/z=136的5个成分α-蒎烯、β-蒎烯、β-月桂烯、α-菲兰烯和柠檬烯;m/z=154的2个成分(cis)-薄荷酮和(2R-cis)-薄荷酮;m/z=156的2个成分(1α.2α.5β)-薄荷醇和(1α.2β.5β)-薄荷醇;以及m/z=204的8个成分(1α,3aα,3bβ,6aβ,6bα)-十氢-3a-甲基-6-亚甲基-1-异丙基-环丁烷并[1,2:3,4]二环戊烯、[1R-(1R,4E,9S)-4,11,11-三甲基-8亚甲基-双环(7.2.0)十一碳4-烯、[1R-(1aα,7α,7aα,7bα]-1a,2,3,5,6,7,7a,7b-八氢-1,1,7,7a-四甲基-1氢-环丙烷[α]并萘、[1aR-(1aα,4aα,7α,7aβ,7bα)-十氢,1,1,7-三甲基4-亚甲基-1-氢-环丙烷[e]并奥、(1S-exo)-2-甲基-3-亚甲基-2-(4-甲基-3-戊烯基)-二环(2.2.1)庚烷、(3aα,3bα,4α,7β,7aR)-八氢-7甲基-3亚甲基-4-异丙基-1氢-不戊烷[ 1,3]并环丙烷[1,2]并苯、1-乙烯基-1-甲基-2-异丙烯基-4(1-甲基亚乙基)环己烷和绿叶烯。 相似文献
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WeiCHEN YueMaoSHEN JianChuXU 《中国化学快报》2003,14(4):385-388
Dissectol A,a novel monoterpene glycoside was isolated from the methanol part of the 95% EtOH extract of Incarvillea dissecfoliola and its structure was determined by 1D and 2D NMR data. 相似文献
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Two new compounds,oleanolic acid 28-O- β-D-glucopyranosyl-3-O-α-L-arabinopyranosyl-(1→3)-(6′-butyl ester)-β-D-glucuropyranoside 1,oleanolic acid 28-O-β-D-glucopyranosyl(1→6)-β-D-glucopyranoside 2 have been isolated from the roots of Hemsleya penxianensis var.gulinensis.Their structures were determined on the bases of the spectral and chemical evidences. 相似文献
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山丹叶中黄酮类化合物的提取及其总含量的测定 总被引:1,自引:0,他引:1
山丹为双子叶植物药百合科植物,别名山豆子花,拉丁名为原植物山丹Lilium concolor Salisb,功效为解毒消肿、活血祛瘀;主治痈疽肿毒、疔疮、吐衄、跌打损伤。 相似文献
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New Eudesmane and Eremophilane Derivatives from Laggera Alata 总被引:5,自引:0,他引:5
Francoise GUéRITTE 《中国化学快报》2003,14(4):393-396
From the aerial part of Laggera alata,a novel erenophilanoid(1)as well as two new eudesmanoids(2-3)were isolated.Their structures were elucidated by 2D-NMR technique and Xray diffraction studies.The cytotoxic activities of these sesquiterpenes were also investigated. 相似文献
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Two unusual nitro-substituted hasubanan-type alkaloids, stephalonines J (1) and K (2), together with ten known alkaloids, protostephanine, dehydrostephanine, (-)-stephanine, (-)-isolaureline, R-roemeroline, (+)-pronuciferine, ( +)-stephafine, ( + )-N-acetylstephafine, ( + )-lirioferine, and ( + )-norlirioferine, were isolated from the whole plant of Stephania longa. Their structures were characterized mainly by spectroscopic methods including IR, MS, and NMR experiments, and the structures of 1 and 2 were further confirmed through chemical correlations with the known alkaloids stephalonines A (1a) and B (2a), respectively. 相似文献