不同提取方法对蜘蛛香挥发油的研究

考察微波辅助萃取法和水蒸气蒸馏法对提取蜘蛛香挥发油化学成分的影响。分别采用微波辅助萃取法和水蒸气蒸馏法提取蜘蛛香挥发油,并用气相色谱质谱联用(GC-MS)对所提取的挥发油化学成分进行分析。微波辅助萃取法和水蒸气蒸馏法制得的蜘蛛香挥油化学成分有一定的差别。     

栀子花挥发油超临界CO2萃取工艺优选分析

采用超临界CO2萃取法,使用正交试验设计方案,以提取率为指标,对萃取温度、萃取压力、分离压力和分离温度等影响因素进行考察。结果表明,超临界CO2萃取法萃取栀子花挥发油成分的最佳工艺条件为：萃取压力15mPa,萃取温度35℃,分离压力15mPa,分离温度25℃。该方法简便、可靠、选择性高,适于工业化生产。     

超临界CO_2萃取-分子蒸馏对白术挥发油的提取分离和GC-MS分析

用超临界CO2萃取技术提取白术挥发油，然后用分子蒸馏对所得的萃取物进行精分离，得到蒸出物；超临界萃取物收率为2．42％(w)，分子蒸馏蒸出物收率26．3％(w)；对超临界萃取物和分子蒸馏蒸出物分别进行GC—MS分析，结果超临界萃取物检测出33个化合物，分子蒸馏蒸出物检测出27个化合物，主要成分均为2，7-二甲氧基-3，6-二甲基萘、γ-芹子烯、大根香叶烯等，但相对含量有区别。     

GC—MS分析不同方法提取的大黄挥发性成分

分别采用顶空进样法和超临界CO2萃取法提取大黄挥发性成分,采用GC-MS结合保留指数进行检测分析。顶空进样法分析鉴定出8种挥发性成分,超临界CO2萃取法鉴定出15种挥发性成分。两种提取方法分别侧重于不同类型的挥发性成分,利用GC-MS结合保留指数进行定性分析,更快速准确。     

提取方式对信阳山茶油品质影响与评价研究

采用超临界CO2法、超声波辅助提取法和索氏提取法提取山茶籽油,对它的理化指标、脂肪酸组成进行测定,并对茶粕有效成分进行分析。研究表明,超临界CO2法和超声波法提油率高,环保安全性和工艺效率好;索氏法提取的油茶籽油酸值过大;从茶粕有效成分含量来看,超声波辅助提取法更优。综合考虑3种提取方法,超声波辅助提取山茶油品质最优。     

用超临界二氧化碳流体提取香兰素

为配合高中化学新课标的实施,介绍使用超临界CO2流体萃取香兰素的基础知识,供一线教师在“有机化学基础”、“实验化学”及“化学与技术”模块课程的教学中选用.     

超临界CO2萃取异甘草素的提取工艺

采用正交试验与单因素试验相结合方法对异甘草素的超临界CO2提取工艺进行了研究,并与常规索氏提取法的实验结果进行了对比。得到的最佳工艺参数为:萃取压力30 MPa、萃取温度45℃、夹带剂85％乙醇、液固比为5:1、CO2流量10 kg／h、分离压力5．5 MPa、分离温度35℃。实验结果表明,在优化的条件下,超临界CO2萃取异甘草素的提取率为0．035％,异甘草素在提取物中的质量分数为0．84％,分别是索氏提取法提取率的3．5倍,质量分数的3．0倍。超临界CO2萃取异甘草素所用时间短、溶剂用量少、提取效率高、环境友好,是一种高效、快速提取异甘草素的方法。     

超声强化超临界CO2萃取樟树叶精油的研究

采用超声波强化超临界CO2萃取樟树叶精油,并采用正交实验对萃取工艺进行了优化.研究结果表明:当萃取压力为16MPa、温度为50℃、时间为80min、CO2流量为16kg/h、超声波功率为240W、超声波频率为20KHz时,能获得比较好的效果,精油的平均提取率可达1.92％.GC-MS的分析结果表明:樟树叶精油中樟脑+β...     

超临界CO2萃取柚子叶挥发油的研究及GC-MS分析

采用超临界CO2萃取技术提取柚子叶的挥发性成分,以挥发油得率为衡量工艺参数的指标,通过正交试验法考察超临界CO2萃取过程中萃取温度、萃取压力、CO2的流量及萃取时间4个因素对柚子叶挥发油得率的影响。结果表明20MPa、萃取温度45℃、CO2流量7kg·h-1、萃取时间120min为最佳工艺。通过GC-MS对挥发油进行分析,从柚子叶挥发油中分离出144个组分,鉴定了61种成分,占化合物检出总量的90.4%。     

超临界CO2流体萃取技术在中药有效成分提取中的应用

论述了超临界CO2流体萃取中药有效成分的优越性以及影响萃取效果的因素,并分析了其应用实例。     

核桃楸叶挥发油化学成分分析

采用水蒸气蒸馏法提取核桃楸叶中的挥发油,从核桃楸叶挥发油中分离了57种化合物,用气相色谱/质谱联用法鉴定了51种化合物,占被分离化合物的89.46%,其中烃类(33种,48.03%)、酮类(1种,0.55%)、醇类(5种,25.94%)、酯类(6种,8.43%)、酸类(1种,0.62%)、含氧杂环类(4种,2.62%)及甲酰类(1种,0.65%)等7大类化合物,有3类(27种,51.19%)为已知药用成分,这些数据为新药开发提供了科学信息.     

Comparative analysis of essential oil components of Evodia rutaecarpa (Juss.) Benth. var. officinalis (Dode) Huang and Evodia rutaecarpa (Juss.) Benth

Essential oils from the fruit of two species of Evodia rutaecarpa from China (Evodia rutaecarpa (Juss.) Benth. var. officinalis (Dode) Huang and Evodia rutaecarpa (Juss.) Benth.) have been obtained by hydrodistillation and analysed by gas chromatography-mass spectrometry in order to discern the differences and similarities between the volatile chemical compositions of these species. More than 21 components were identified in essential oils of the studied plants. In the oil of E. rutaecarpa (Juss.) Benth. var. officinalis (Dode) Huang, the main essential oil ingredients were β-myrcene (44.43%) and β-pinene (39.88%). β-pinene (72.82%), 1R-α-pinene (8.90%) and β-myrcene (1.99%) were the major compounds in the oil of E. rutaecarpa (Juss.) Benth. The chemical compounds of the essential oils showed that there are only six common compounds between the two species.     

植物油中脂肪酸不同定量方法的比较分析

比较峰面积归一化法与标准曲线法两种方法分析植物油中脂肪酸百分比含量的差异.利用气相色谱-质谱联用仪(GC-MS)检测10种市售食用植物油中的8种主要脂肪酸,峰面积归一化法和标准曲线法计算脂肪酸的百分比含量.结果表明,标准曲线法与峰面积归一化法相比,肉豆蔻酸、棕榈酸、十七烷酸、硬脂酸和棕榈油酸所占的百分比升高,而油酸、亚...     

A new iridoid compound from Patrinia rupestris (Pall.) Juss

Extraction of roots of Patrinia rupestris (Pall.) Juss. gave a new iridoid compound, 1β,3α-diethyloxy-7-hydromethyl-4-(3-methyl-butyryloxymethyl)-cyclopenta-4(4a),7(7a)-diene[c]pyran-6-one (1), together with a known compound, (1α,4aα,?6α,7β,7aα)-[4a,5,6,7,7a-hexahydro-6,7-dihydroxy-1-(3-methyl-1-oxobutoxy) cyclopenta[c]pyran-4,7-diyl]bis(methylene) 3-methyl-butanoic acid ester (2). The structure of 1 was characterised by HRESIMS, IR, UV, 1-D NMR and 2-D NMR methods. Compound 2 was isolated from this genus for the first time.     

香樟树叶挥发油的化学成分研究

用同时蒸馏萃取法(SDE)和气相色谱-质谱连用技术(GC-MS)对香樟树叶挥发油成分进行了分离分析,共鉴定出98种化合物。其中主要成分为樟脑与β-芳樟醇(24.099%)、桉油醇(15.723%)、α-松油醇(11.204%)、石竹烯(4.957%)、蛇床-6-烯-4-醇(5.724%)、β-水芹烯(3.394%)等。     

Rapid Determination of Volatile Compounds in Toona sinensis (A. Juss.) Roem. by MAE-HS-SPME Followed by GC–MS

Toona sinensis (A. Juss.) Roem. belonging to the Toona family was used as one of the traditional Chinese medicines in China. Based on microwave-assisted extraction (MAE) and headspace solid-phase microextraction followed by gas chromatography-mass spectrometry, the volatile compounds of Toona sinensis (A. Juss.) Roem. were determined. Results indicated that the optimum condition of the determination of the volatile compounds in Toona sinensis (A. Juss.) Roem. was achieved with the experimental parameters including fiber coating of PDMS/DVB, microwave power of 400 W and irradiation time of 4 min. Under the optimal conditions, for the first time, 45 volatile compounds were separated and identified from the fresh leaves of Toona sinensis (A. Juss.) Roem. The highest content component of the 45 compounds was trans-Caryophyllene (21.422%). Relative standard deviation (RSD) values <9% showed that the present method has good precision. The experimental results demonstrate that MAE-HS-SPME followed by GC–MS is a simple, time-saving and solvent-free method, and it is a potential analytic tool for the determination of the volatile compounds of TCMs.     

薤白挥发油成分的超临界CO2萃取及GC-MS分析

采取超临界CO2萃取和水蒸气蒸馏两种方法提取薤白中的挥发油,比较了两种提取方法得到的挥发油的理化性质,并利用GC-MS对它们进行了定性、定量分析。两种方法的主要提取物均为含硫化合物,但超临界CO2萃取法得到的含硫化合物的数量和质量都高于水蒸气蒸馏法得到的提取物。采用水蒸气蒸馏法提取8 h得到的萃取率为1.72%。通过设计的超临界CO2萃取的正交实验,得到了最佳萃取工艺条件为:压力25 MPa,温度40℃,CO2流量为25L/h。最佳萃取时间为120 min,萃取率为4.41%,是水蒸气蒸馏法萃取率的2.8倍。实验结果表明,超临界CO2萃取法简单易行,可以较快速、有效地提取薤白中的挥发油。     

A new sesquilignan from Selaginella sinensis （Desv.） Spring

A new sesquilignan, namely sinensiol A, was isolated from the plant of Selaginella sinensis （Desv.） Spring. Its structure was identified on the basis of various spectroscopic data analysis.     

GC-MS分析大叶金花草中挥发性成分和脂肪酸

应用 GC-MS 联用技术对大叶金花草(Stenoloma chusana(L.)Ching)的挥发性成分和脂肪酸进行了检测,共检测出7种挥发性成分和32种脂肪酸,脂肪酸检出量为87.65%,其中饱和脂肪酸占脂肪酸总量的53.13%,不饱和脂肪酸占脂肪酸总量的46.87%.该研究为大叶金花草的进一步开发利用提供了科学依据.     

Comparative study on the antioxidant activities of the different extracts and the composition of the oil extracted by n-hexane from Iranian Vitex pseudo-negundo

Antioxidant activities of different extracts obtained from the aerial parts of Vitex pseudo-negundo from Kashan, central Iran, were evaluated for the first time in this study using β-carotene/linoleic acid and scavenging of free-radical (DPPH) assays. Water extract showed the highest activity in both assays. GC-MS analysis of the oil extracted by n-hexane revealed 46 compounds with trans-β-farnesene being the main component. Several new compounds, not reported in the previous literature, were identified in the essential oil of this chemo-type.