共查询到19条相似文献,搜索用时 62 毫秒
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北沙参的化学成分研究 总被引:2,自引:0,他引:2
为了进一步研究药材北沙参(Glehnia littoralis F. Schmidt ex Miq)的药效物质基础,采用硅胶柱色谱、凝胶色谱Sephadex LH-20和高效液相色谱方法,从药材北沙参中分离得到了8个化合物.运用IR、1DNMR、2DNMR及与文献比较,鉴定它们的结构分别为:羽扇豆醇(Ⅰ)、桦木醇(Ⅱ)、β-谷甾醇(Ⅲ)、胡萝卜苷(Ⅳ)、人参炔醇(Ⅴ)、法卡林二醇(Ⅵ)、(8E)-1,8-heptadecadiene-4,6-diyne-3,10-diol(Ⅶ)和异欧前胡素(Ⅷ).其中,化合物Ⅰ,Ⅱ和Ⅳ为首次从该药材中分离得到. 相似文献
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植物硅酸体化学成分的研究 总被引:1,自引:0,他引:1
植物硅酸体化学成分的研究,在植物学和地质学中都有重要意义。前者是为了研究不同化学元素在植物生理、生化中的作用;后者是了解不同植物硅酸体中C与O元素的含量,为利用硅酸体进行年代学研究、进行C与O同位素及古环境研究提供依据。本文除对硅酸体化学成分的重要意义进行阐述外,并研究了16个种属植物硅酸体的化学成分,将为硅酸体研究在我国的应用提供有意义的科学依据 相似文献
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采用硅胶、凝胶等色谱分离方法进行分离纯化,采用理化常数及波谱学方法鉴定结构,研究了南海海绵Haliclona sp.的化学成分.结果从南海海绵Haliclona sp.中分离得到9个化合物,经鉴定分别为:正十六烷基甘油醚(Cetyl ethers of glycerol,1)、正十二烷酸(Dodecanoic acid,2)、2'-脱氧腺苷(2'-deoxyadenosin,3)、尿苷(Uridine,4)、2'-脱氧尿苷(2'-deoxyuridine,5)、2'-脱氧胸苷(2'-deoxythymidine,6)、a-乙基葡萄糖苷(a-ethyl glucoside,7)、对羟基苯乙胺(Tyramine,8)、异戊胺(Isopentylamine,9).化合物4、5、7和9为首次从该属中分离得到. 相似文献
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对采自我国南海海域的蓖麻海绵Biemnasp .的化学成分进行了研究。从中分离出 4个结晶化合物。经FT -IR ,MS ,1 HNMR ,1 3 CNMR ,DEPT等波谱方法鉴定分别为正二十八酸(Ⅰ) ,正十六酸 (Ⅱ) ,穿贝海绵甾醇 (Ⅲ )和biemnamide (Ⅳ )。报道了 (Ⅰ) ,(Ⅱ) ,(Ⅲ )的化学结构和 (Ⅳ )的生理活性 相似文献
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通过多种化学分析方法 ,初步探讨了扇贝肝胰腺组织的化学成分。结果表明 :该组织中含有较丰富的营养物质 ,并含有重要生理活性的 EPA和 DHA,微量元素含量也很丰富。这些结果为扇贝加工后下脚料的利用 ,提供了基础资料 相似文献
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植物硅酸化学在分的研究,在植物学和地质学中都有重要意义,前者是为了研究不同化学元素在植物生理,生化中的作用;后者是了解不同植物硅酸体中C与O元素的含量,为利用硅酸体进行年代学研究,进行C与O同位素及古环境研究提供依据,本文除对硅酸体化学成分的重要意义进行阐述外,并研究了16个种属植物硅酸体的化学成分,将为硅酸体研究在我国的应用提供有意义的科学依据。 相似文献
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二色桌片参的化学成分研究:Ⅲ、二色桌片参多糖—1——岩藻聚糖的免疫调节 总被引:3,自引:0,他引:3
研究了二色桌片参多糖-1(PMI-1)在体内、体外的免疫调节作用。结果表明。二色桌片参多糖-1体外能促进小鼠脾淋巴细胞增殖,促进小鼠脾淋巴细胞分泌IL-2;体内能显著促进迟发型敏反应,增加脾指数,胸腺指数:具有显著的免疫增强作用。 相似文献
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萹蓄化学成分及其归经药性初探 总被引:4,自引:0,他引:4
对中药萹蓄化学成分及归膀胱经的药性进行了初步研究.确定抑菌活性有效部位,并采用植化方法分离鉴定了化学成分;利用高效液相和液-质联用技术,研究入血成分及其在体内脏器中的分布.结果表明,总黄酮是萹蓄抑菌活性的有效部位,主要含有山奈酚(Ⅰ),槲皮素(Ⅱ),杨梅素(Ⅲ),杨梅树皮苷(Ⅳ),胡桃宁(Ⅴ)和萹蓄苷(Ⅵ).大鼠口服萹蓄总黄酮后,在其血浆中可以检测到化合物Ⅴ和Ⅵ.Ⅵ在膀胱经脏腑中有分布,初步验证了萹蓄归膀胱经的药性理论. 相似文献
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运用硅胶柱层析、Sephadex LH-20凝胶柱层析和HPLC等技术,采用活性追踪分离的方法,对南海短指软珊瑚Sinularia sp.的化学成分进行了研究.从乙醇提取物中分离获得单体化合物,运用NMR,MS等波谱技术鉴定了8个化合物的结构,分别为:3β-羟基-24-亚甲基胆甾-5-烯-7-酮(1),孕甾烯醇酮(2),cembrene A(3),epoxycembrane A(4),4,8,12-trimethyl-1-(1-methylethenyl)-3,7-cyclotetradecadien-10-one(5),(3E,7E,11E)-11,12-dihydroxy-1-isopropyl-4,8,12-trimethyicyclotetradeca-1,3,7-triene(6),邻苯二甲酸二丁酯(7)和十九烷-2-酮(8).化合物5和8为首次从珊瑚动物中分离得到,6为首次从短指软珊瑚属中分离得到.化合物3和4显示较强的卤虫致死活性.西松烷二萜类化合物是该短指软珊瑚中的重要活性成分. 相似文献
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研究分析羊栖菜岩藻聚糖疏酸酯化学组成,为产品研制开发提供理论依据。采用稀酸提取和乙醇沉淀的方法得到羊栖菜岩藻聚糖硫酸酯粗品,粗品通过Q-Sepharose F.F.阴离子交换树脂进行分级纯化,得到硫酸基含量不同的3个组分(F-1,F-2和F-3),并对这3个组分的总糖、硫酸基、糖醛酸、氨基糖的含量及中性单糖组成和得率等进行了全面的分析。结果表明,羊栖菜岩藻聚糖硫酸酯主要由岩藻糖、半乳糖、甘露糖、葡萄糖及少量的鼠李糖、木糖和阿拉伯糖组成。3个组分中F-3的硫酸基含量最高(40.2%)但得率太低(0.8%);F-1的总糖(68.4%)和糖醛酸(17.9%)含量最高;3者氨基糖的含量均很低(≤1.0%);F-1,F-2和F-3相对分子质量分别约为210 000,160 000和140 000,F-2和F-3的纯度较高。 相似文献
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滨海湿地耐盐植物二色补血草化学成分研究 总被引:5,自引:0,他引:5
采用硅胶柱层析,Sephedex-LH-20凝胶层析,HPLC等方法,从滨海湿地耐盐植物二色补血草中分离得到了10个单体化合物。运用NMR,MS以及与文献对照,鉴定它们的结构分别为豆甾烷-3,6-二酮(1),豆甾-4烯-3,6-二酮(2),6β-羟基-豆甾-4-烯-3-酮(3),5α,8α-环二氧-24-甲基-胆-甾6,22E-二烯-3β-醇(4),5,α8α-环二氧-24-甲基-胆甾-6,9,22E-三烯-3β-醇(5),麦角-甾4,6,8(14),22E?四烯-3-酮(6),植醇(7),正十六烷酸(8),亚油酸(9),亚油酸单甘油酯(10)。化合物1~7和10为首次从该植物中分离得到。 相似文献
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This paper presents a review of the past decade's highlights of research on the isolation and characterisation of particulate
organic matter (POM) in the world's oceans. The emphasis is on chemical studies but, in keeping with the growing interdisciplinary
nature of marine science, advances in other disciplines are also discussed, particularly those in biological sciences. Increasing
evidence for the importance of picoplankton, bacteria and viruses as POM constituents is highlighted, including the recent
recognition of large populations of autotrophic bacteria able to harvest light for energy. The transport of POM to bottom
waters was thought to be largely confined to large, rapidly sinking faecal pellets. However, recent studies have highlighted
the importance of organic aggregates and flocs formed by diatoms such as Rhizosolenia and other microalgae. Ascending particles have also been discovered, many of which are lipid-rich. Several studies have shown
that resuspension of bottom sediments and lateral advection of material from continental shelves can lead to anomalously high
particle fluxes measured in sediment traps moored in deep water. Many new approaches for characterizing POM have emerged,
such as pyrolysis gas chromatography-mass spectrometry and direct temperature-resolved mass spectrometry for analysis of higher
molecular weight materials and biopolymers. Lipid biomarker techniques have also advanced, exciting new possibilities being
raised by the ability to measure stable and radioactive carbon isotopes for individual compounds. The techniques of molecular
biology, such as the polymerase chain reaction (PCR), are being increasingly applied to provide complementary information
to more conventional microscopy and flow cytometry on the identity of organisms in the sea. The combination of these techniques
with advanced chemical analysis methods promises to greatly increase our knowledge of the origins, transport and fate of organic
matter in the oceans.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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The distribution of inorganic nitrogen compounds and the metabolic rates of these compounds by microorganisms as a whole were investigated in the Seas of Hiuchi and Bingo. The results obtained are as follows:
- Of inorganic nitrogen compounds, the contents in sea water, those in bottom muds, the uptake or liberation rates of microorganisms as a whole in sea water, and the liberation rates from bottom muds to sea water are 0.2~4.0 μg at. N/l, 3~60 μg at.N/100 g, 0.01~0.5 μg at.N//lhr, and 0.3~1.9 μg at.N/100 cm2/hr, respectively, and these contents or rates of ammonia usually are the largest of these inorganic nitrogen compounds.
- From the above-mentioned results and the others, it is suggested that the nitrogen in the seas circulates mainly in sea water itself and the course of nitrogen cycle, which passes through bottom muds, is not so important, and further that, of the cycle of inorganic nitrogen compounds, the main course is the course which ammonia is liberated from organic nitrogen compounds and it is immediately uptaked by microorganisms, and the course which it is oxidized to nitrate and the others are not so important.