共查询到20条相似文献,搜索用时 468 毫秒
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《广州化工》2016,(23)
对亚贡叶中化学成分进行进一步分离研究,并对分离化合物进行结构鉴定和分析。通过采用ODS,硅胶柱色谱,凝胶柱色谱以及半制备色谱结合谱学数据鉴定的方法,对亚贡叶乙醇提取物进行分离。通过谱学鉴定,分离得到4个单体化合物,并将其分别确定为亚油酸乙酯(9E,12E)enyloctadeca-9,12-dienoate,ent-18-hydroxykautan-16-en-19-oic acid,Grandiflorolic acid和8β-methacryloxymelampolide-14-oic acid methyl ester。其中化合物亚油酸乙酯为首次从亚贡叶中分离得到。 相似文献
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研究中药狗舌草(Tephroseris phaeantha)全草的化学成分并对分离得到的化合物进行了细胞毒活性试验。采用硅胶柱色谱、Sephadex LH-20柱色谱等方法分离纯化,根据理化性质和波谱数据进行结构鉴定。从狗舌草中分离并鉴定了5个化合物,分别为正二十六烷醇(1),β-谷甾醇(2),白桦脂酸(3),对羟基苯乙酮(4),东莨菪内酯(5)。化合物1~5均为首次从狗舌草中分离得到。并对得到的化合物2、3进行了人体肺癌细胞模型VA-13和人体肝癌细胞HepG2的细胞毒活性试验。化合物3显现出一定的抗癌活性。 相似文献
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综合运用硅胶柱色谱、反相硅胶柱色谱、Sephadex LH-20凝胶柱色谱以及制备型高效液相等色谱分离技术,对番荔枝科鹰爪花属植物狭瓣鹰爪花Artabotrys hainanensis枝叶中的化学成分进行系统研究。结合理化性质和多种现代波谱技术,并通过与文献进行对照,鉴定了从狭瓣鹰爪花枝叶90%乙醇提取物的中分离得到6个化合物,分别鉴定为:5-羟基-7,8-二甲氧基二氢黄酮(1)、litseachromolaevane A(2)、liguducin A(3)、1β-hydroxy-4(15),5E,10(14)-germacratriene(4)、(9E,11Z)14-hydroxyoctadecan-9,11-dienoic acid(5)和benzyl benzoate(6)。其中化合物1为黄酮类化合物,化合物2-4为倍半萜类化合物,化合物5为脂肪酸类化合物,化合物6为芳酸类化合物,所有化合物均为首次从鹰爪花属植物中分离得到。 相似文献
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Atsuhiko Nagasawa Yuji Kamada Yuji Kosaka Naohiro Arakida Masatoshi Hori 《Journal of chemical ecology》2014,40(5):452-457
The cigarette beetle, Lasioderma serricorne, is a serious global pest that preys on stored food products. Larvae of the beetle cannot grow on roasted coffee beans or dried black or green tea leaves, although they oviposit on such products. We investigated oviposition by the beetles on MeOH extracts of the above products. The number of eggs laid increased with an increase in dose of each extract, indicating that chemical factors stimulate oviposition by the beetles. This was especially true for \ coffee bean extracts, which elicited high numbers of eggs even at a low dose (0.1 g bean equivalent/ml) compared to other extracts. Coffee beans were extracted in hexane, chloroform, 1-butanol, MeOH, and 20 % MeOH in water. The number of eggs laid was higher on filter papers treated with chloroform, 1-butanol, MeOH, and 20 % MeOH in water extracts than on control (solvent alone) papers. The chloroform extract was fractionated by silica-gel column chromatography. Nine compounds were identified by gas chromatography/mass spectrometry from an active fraction. Of these compounds, only a significant ovipositional response to catechol was observed. 相似文献
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Chemical Characterization and Physical Properties of Solvents Derived from Epoxidized Methyl Soyate 下载免费PDF全文
Sean J. Riley John G. Verkade Robert J. Angelici 《Journal of the American Oil Chemists' Society》2015,92(4):589-601
Reactions of epoxidized methyl soyate (EMS) with alcohols, carbon dioxide, and acetone yielded liquids with solvent properties that make them more suitable than methyl soyate for dissolving polar substances. The reactions of EMS in the presence of Amberlyst‐15 with alcohols, including methanol, ethanol, n‐butanol, and 2‐methoxyethanol, produced a series of solvents containing ether (–OR) and alcohol (–OH) groups. Reactions of EMS with carbon dioxide and acetone gave products with carbonate and ketonide functional groups, respectively. The complex mixture of compounds present in the product, EMS(MeOH), resulting from the reaction of EMS with MeOH, was characterized by MS and NMR investigations. In addition to products resulting from MeOH addition across the epoxide ring, were major amounts of cyclic tetrahydrofuran derivatives that were derived from reactions of methyl linoleate (18:2) with MeOH. All of the solvents were characterized by high boiling points and low vapor pressures. Their viscosities were higher than that of methyl soyate. Especially notable were their very high Kauri‐butanol values, which ranged from 280 to 852, all of which are much higher than that (57) of methyl soyate. Such high KB values indicate that these solvents have very favorable solubilizing properties, which is illustrated by the ability of EMS(MeOH) to readily dissolve both polar (e.g., MeOH) and non‐polar (e.g., hexane) compounds. 相似文献
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采用纤维素酶提取法(CE)和水蒸气蒸馏提取法(DSE)提取莪术药材中的挥发油成分,利用气相色谱-质谱联用技术对其进行化学成分分析,分别鉴定出34种和26种化学成分,用峰面积归一法,通过数据处理系统得出各化学成分,分别占挥发油总成分的67.61%和60.15%,共同组分中,含量最多的是表-莪术酮和β-姜黄酮。 相似文献
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采用纤维素酶提取法(CE)和水蒸气蒸馏提取法(DSE)对香薷草挥发油成分进行比较研究。利用气相色谱-质谱联用技术对其化学成分进行分析,从中分别鉴定出23种和13种化学成分,用峰面积归一法通过数据处理系统得出各化学成分在挥发油中的百分含量,分别占挥发油总成分的97.17%和97.72%,共同组分中含量最多的是百里香酚和香荆芥酚。 相似文献
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固相微萃取气质联用分析野茉莉花的香气成分 总被引:5,自引:2,他引:5
研究了贵州产野茉莉花的芳香成分,用固相微萃取技术提取野茉莉花的香气成分,用气相色谱-质谱联用技术进行了分析测定,共鉴定出37个化学成分,占挥发油色谱总峰面积的92.71%。其中含量较高的组分有:w(α-蒎烯)=24.87%、w(β-香叶烯)=12.68%、w(橙花叔醇)=12.15%、w(桂皮醛)=9.09%、w(反式-β-罗勒烯)=7.76%、w(3-苯基-丙烯醇)=5.52%、w(小蠹二烯醇)=2.74%、w(芳樟醇L)=2.53%、w(β-蒎烯)=1.80%等。 相似文献