铁牛七肪酸微波辅助提取及GC-MS分析研究
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摘要
铁牛七(Aconitum szechenyianum Gay.)是毛莨科(Ranunculaceae)乌头属(Aconitum L)植物铁棒锤的干燥块根,主要分布于陕西秦岭山脉的太白山,生长于海拔2500米以上的山地草丛或林缘,是铁棒锤的别称。铁棒锤为陕、甘、宁、藏等地应用较广的一种民间草药,具有活血祛瘀,祛风湿,止痛,消肿败毒,去腐生肌,止血,治疗跌打损伤,风湿性关节炎,腰腿痛,劳伤,恶疮,痈肿,无名肿毒,冻疮,毒蛇咬伤等作用。药理学研究表明该药制成注射液有很强的镇痛、局麻、抑制呼吸、抗炎作用。关于铁牛七化学成分的研究已有报道,但尚未见到关于铁牛七肪酸研究的具体报道。
     本论文包括文献综述和研究报告两部分内容。
     第1章:文献综述
     1.铁牛七研究概况
     包括铁牛七概述、资源分布及鉴定、化学成分研究、药理作用的现状和进展等。
     2.微波辅助提取研究概况
     微波辅助提取研究概况部分涉及微波及其特性、微波加热的原理及特点、微波辅助提取法的原理及特点、微波辅助提取仪器及实验条件、微波辅助提取的应用实例几方面。
     3.肪酸研究概况
     包括肪酸的提取、肪酸的甲酯化、肪酸分析、肪酸的药理作用等方面内容。
     第2章:研究报告
     课题主要研究内容为:
     1.微波辅助提取铁牛七肪酸
     探讨了不同提取溶剂、溶剂浓度、微波提取功率、微波辐射时间以及料液比等条件对提取得率的影响。实验结果表明,铁牛七肪酸的最佳微波提取条件为:微波功率400W,溶剂丙酮浓度90%,料液比lg∶16 mL,微波辐射时间5min。最优条件下,铁牛七总肪酸提取率达13.0%。
     2.铁牛七肪酸索氏提取
     10.0g铁牛七药材粉末,用两张脱滤纸包起来装入索氏提取装置提取管内,加160mL90%丙酮于提取瓶内,连续回流提取6h。此条件下,铁牛七肪酸提取率为3.8%。
     3气相色谱-质谱联用分析铁牛七肪酸成分
     分别优化进样口温度、进样模式、分流比和进样量、载气流速、程序升温,建立最佳分析铁牛七肪酸成分的GC-MS条件。具体条件为:选择Rtx(?)-5MS%dipheny-95%dimethylpolysiloxane(0.25mm×30.0m,0.25μm)弹性石英毛细管色谱柱分析铁牛七提取物成分,程序升温为初温184℃,以0.2℃/min升温至191℃,进样口温度:260℃,分流进样模式,分流比:10:1,流速:1.00 mL/min,进样量:1μL;电子轰击(EI)离子源,离子源温度200℃,接口温度200℃,电子能量70eV,倍增器电压0.9kV,溶剂延迟时间4.5min,质量扫描范围m/z 40~500amu。
     按照上述已建立好的GC-MS分析条件,铁牛七微波辅助提取和索氏提取两种方法的提取物经甲酯化衍生后,对其进行分离和分析,得到不同提取物各自总离子流色谱图(TIC)。各色谱峰相应的质谱图经人工解析及NIST05和NIST05s谱库检索,按各色谱峰的质谱碎片图与文献核对,查对有关质谱资料,对基峰、质荷比和相对丰度等方面进行直观比较,确定其化学成分,并用面积归一化法,测定出其相对含量。
     4.铁牛七肪酸两种提取方法的比较
     微波辅助提取物和索氏提取物分别鉴定出8,9种肪酸,所鉴定肪酸成分相似,主要是十四烷酸、十五烷酸、棕榈油酸、棕榈酸、十七烷酸、硬酸、亚油酸、亚麻酸、油酸,相同肪酸的相对含量略有差异。与传统索氏提取法时间6 h提取率3.8%相比,微波辅助提取时间大大缩短(仅是索氏提取的1/72),提取率却远高于索氏提取,且溶剂用量少,消耗能量少,CO_2排放量少对环境影响小。因此,微波辅助提取铁牛七肪酸具有产率高、时间短、能耗低等优点,较索氏提取优势明显。
Aconitum szechenyianum Gay. is dry earthnut of Ranunculaceae Plants Aconitum pendulum Busch., and it is mainly produced in Shannxi Taibai, growing in the mountainous grasscluster or forest edge of the elevation more than 2500 meters. Aconitum pendulum Busch. is mainly distributed in some regions of China, such as Xizang, Ningxia, Gansu, Shaanxi etc provinces . As a traditional Chinese medicinal herb, it exhibits blood-activated, detumescent and styptic effects, and treats joint pain, arthritic and rheumatic diseases etc. Pharmacological studies demonstrated that its injection possesses anti-inflammatory, analgesic and antitumor activities. There were a few reports on the constituents of Aconitum szechenyianum Gay., but to the best of our knowledge, no detailed report has yet appeared on the fatty acid components of it up to now.
     There are two parts in this thesis:
     Part one: Review
     1. Study survey of Aconitum szechenyianum Gay.
     It includes summary, resource distribution and authentication, study progress on chemical composition, pharmacological effects about Aconitum szechenyianum Gay.
     2. Study survey of microwave-assisted extraction
     It includes the definition and characteristics of microwave, the theory and characteristics of microwave heating and microwave-assisted extraction, the extraction apparatus, experiment condition and the application.
     3. Study survey of fatty acids
     It mainly involves extraction, derivatization to methyl esters, analysis and pharmacological research of fatty acids.
     Part two: Research papers
     Four main contents are included in this part.
     1. Microwave-assisted extraction (MAE) of fatty acids from Aconitum szechenyianum Gay. The extraction solvent, solvent concentration, microwave power, radiation time, and ratio of solid to liquid were valued to compare the extraction yield of fatty acids. The optimum process condition was confirmed that microwave power was 400 W, acetone-water solvent concentration 90%, ratio of solid to liquid 1 g:16 mL, radiation time 5 min, and an extraction yield of 13.0% of total fatty acids could be obtained.
     2. Soxhiet extraction (SE) of fatty acids from Aconitum szechenyianum Gay.
     About 10.0 g powder was weighed, quantitatively transferred into a filter paper extraction thimble and inserted into a 250 mL reflux flask, then extracted with 160 mL 90% acetone-water solvent for about 6 h in a soxhiet apparatus.
     3. Analysis of fatty acids in extracts of Aconitum szechenyianum Gay. with GC-MS
     The analysis condition was optimized at the aspects of injection temperature, split mode, split ratio, injection volume, flow of carrier gas, temperature programmed and so on. The proper conditions are as follows: A fused silica capillary Rtx~(?)-5MS%dipheny-95% dimethylpolysiloxane column (30 m×0.25 mm i.d., film thickness 0.25μm) was used for the separation. Helium at a constant flow-rate of 1.00 mL/min was used as the carrier gas. 1μL extract was injected into the column with a split ratio set at 10:1 and injector port temperature at 260℃. The GC program was initiated by a column temperature set at 184℃, and then increased to 191℃at a rate of 0.2℃/min. Temperatures of the ion source and interface were all 200℃. The mass spectrometer was operated with El-mode at 70eV and the mass range was from m/z 40 to 500 amu.
     The extracts of Aconitum szechenyianum Gay. obtained by microwave-assisted extraction and soxhiet extraction were identified respectively under the optimum GC-MS analysis condition. And relative amount of individual components were calculated based on GC peak areas.
     4. Comparision of microwave-assisted extraction and soxhiet extraction
     It can be seen that 8, 9 kinds of fatty acids in the MAE and SE extracts have been identified respectively. The chemical compositions of both extracts are similar, yet relative amount of the same fatty acids have few difference. The main components are palmitoleic acid, palmitic acid, linoleic acid, linolenic acid, oleic acid and stearic acids. Compared with soxhiet extraction, much shorter extraction time, better yield, lower cost and better environment ecology is advantageous for the proposed microwave-assisted extraction method.
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