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黄顶菊中噻吩类和酚酸类物质的研究
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摘要
本文对外来入侵植物黄顶菊中噻吩类及酚酸类组分的提取工艺、含量测定及分离纯化进行了综合的研究,为黄顶菊资源化利用提供了数据支持。
     实验研究了噻吩类及酚酸类组分的提取工艺,通过含量测定确定各有效成分的最佳提取工艺。提取噻吩类工艺为:石油醚,料液比1:10,65℃下回流提取一次,时间1h。提取酚酸类工艺为:碱水提取,pH=10的NaOH溶液,料液比1:15,95℃下回流提取两次,每次1h,滤液用1mol·L-1的HCl调pH值为3.
     高速逆流色谱法(HSCCC)是一种无需要任何固态支持介质的液液分配色谱分离支持,由于不使用固态支持介质,避免了因不可逆吸附而引起的样品损失、失活、变性等。高速逆流色谱法已广泛应用于天然产物有效成分的分离,本实验用半制备型高速逆流色谱优化选择的两相溶剂体系为:正己烷-乙腈(1:1,v/v),从265.6mg黄顶菊提取粗品中分离纯化出2.2mg 5-(3-丁烯-1-炔基)-2,2'联二噻吩,5.2mgα-三联噻吩和4.3mg 5-(3-戊烯-1-炔基)-2,2'联二噻吩三种单体,纯度分别为90.2%,99.9%和92.1%,并通过EI-MS,1H NMR和13C NMR光谱数据分析确认其结构。其中化合物5-(3-戊烯-1-炔基)-2,2'联二噻吩首次从黄顶菊中发现并分离得到。
     采用培养皿滤纸法对黄顶菊中化感物质进行了部分生物测试,对其化感作用进行了初步研究。
In this article, the extraction techniques of thiophenes and phenolic acids from Flaveria bidentis (L) Kuntze were investigated, including determination, the optimum solution in extraction, separation and purification. The data was supported in order to make use of this invasive plant.
     This thesis carried out a study on the extraction techniques of thiophenes and phenolic acids. The optimum extraction techniques were determined by the results of detection. The optimum extraction condition of thiophenes by refluxing is as follows:petroleum ether, ratio of material and fluid:1:10(w/v), once refluxing under 65℃, extracting time:1h. The optimum extraction condition of phenolic acids by refluxing is as follows:solution of NaOH at pH=10, ratio of material and fluid:1:15(w/v), twice refluxing under 95℃, extracting time:1h, filtrate was adjusted to pH=3 using 1mol·L-1 HCl.
     High-speed counter-current chromatography (HSCCC), being a support-free liquid-liquid partition method, eliminates irreversible adsorption of sample onto the solid support, and has been widely used in preparative separation of natural products. In present study, the two phase solvent system of HSCCC composed of hexane-acetonitrile=1:1(v/v), which has been selected by semi-preparative HSCCC.2.2 mg 5-(3-buten-1-ynyl)-2,2'-bithienyl,5.2 mg a-terthienyl and 4.3 mg 5-(3-penten-1-ynyl)-2,2'-bithienyl with the purity of 90.2%,99.9% and 92.1% respectively, were produced from 265.6 mg crude extract, and 5-(3-penten-1-ynyl)-2,2'-bithienyl was isolated from Flaveria bidentis (L) Kuntze for the first time. The structures of the separated compounds were identified by EI-MS,1HNMR and 13CNMR.
     By using Petri dishes filter method, part of bioassay of allelochemicals in Flaveria bidentis (L) Kuntze were proceeded in order to study its allelopathy.
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