毛大丁草不同部位挥发油成分的比较

用GC—MS技术对毛大丁草叶、茎、根挥发油的化学成分分别进行分析和鉴定,共分离出63个成分,鉴定了55个。不同部位挥发油中低沸点成分的相对含量分别是21.902％,40.112％和77.622％。

微波辅助萃取法萃取洋葱油树脂化学成分

采用Mars5微波辅助萃取系统萃取洋葱油树脂,并采用GC-MS技术对其有效成分进行结构鉴定。研究表明,洋葱油树脂中除含少量挥发性成分外,主要是沸点较高的烷基硫代亚磺酸酯和烷基硫代磺酸酯、二硫醚、三硫醚等难挥发性树脂成分。

陕西韩城大红袍花椒挥发油化学成分的研究

利用GC-MS技术对陕西韩城大红袍花椒的挥发油化学成分进行了研究,从大红袍花椒挥发油中分离出40个组分,鉴定出29种成分,主要成分是柠檬烯(Limonene),含量14.82%;月桂烯(myrcene),含量13.26%;桉树脑(Eucalyptol),含量10.69%;桧烯(sabinerl),含量6.74%;α-蒎烯(α-pineme),含量5.51%;α-守烯(alphathujene),含量4.99%;芳樟醇(Linalool),含量4.51%;α-松油醇(α-terpined),含量4.32%。

陕北宜川(壶口)大红袍花椒挥发油化学成分的研究

利用GC-MS技术对陕北宜川大红袍花椒的挥发油化学成分进行了研究,从大红袍花椒挥发油中分离出49个组分,鉴定出36种成分,主要成分和含量是9-烯-十八碳酸乙酯含量8.33%,棕榈酸乙酯含量7.20%,α-松油醇含量7.09%,芳樟醇含量7.03%,桉树脑含量6.06%。

3种浸渍酶对蛇龙珠葡萄酒香气影响的比较

香气是葡萄酒的重要感官成分,它来自于葡萄浆果、酿造和陈酿各阶段。葡萄酒酿造过程中添加浸渍酶有助于葡萄中香气前体物的浸出,增加葡萄酒的芳香潜能。本研究采用顶空固相微萃取(HS-SPME)技术提取香气物质,气相色谱与质谱联用(GC-MS)技术定性定量分析香气物质,比较了FCE、Vinozym G和Ex-colour3种浸渍酶对蛇龙珠葡萄酒香气物质的影响。结果显示,3种浸渍酶处理的蛇龙珠葡萄酒中主要香气成分相似,但含量有所差异。添加Vinozym G浸渍酶处理的酒中酯类、酸类、醇类、萜烯类、酮类、苯环衍生物类等各类香气物质总量均达到最高,对萜烯类香气物质的浸促作用尤为显著;表明Vinozym G浸渍酶更有利于增强蛇龙珠葡萄酒的芳香潜力。

Essential Oil Composition of Four Endemic Tanacetum L. （Asteraceae） Taxa from Turkey and a Chemotaxonomic Approach

In this study the essential oil components aerial parts of Tanacetum heterotomum （Bornm.） Grierson, T. zahlbruckneri （Nab.） Griersson, T. densum （Lab.） Schultz Bip. subsp, amani Heywood and T. cadmeum （Boiss.） Heywood subsp, orientale were examined by HS-SPME/GC-MS technique. Thirty six, thirty nine, forty and forty five constituents were determined representing 88.9%, 90.1%, 90.8% and 91.5% of the oil, respectively. The main compounds of studied Tanacetum L. taxa; borneol, α-pinene, 1,8-cineole, β-pinene, camphor, germacrene D, spathulenol are determined. Studied Tanacetum taxa showed congruency with the discription in Flora of Turkey as morphological properties; on the contrary essential oil composition were detected very quiet diverse infrageneric level. Chemotypes of Tanacetum L. taxa were reported as borneol, germacrene D, spathulenol, α-pinene, 1,8-cineole, β-pinene and camphor. The results obtained from this study were discussed in terms of chemotaxonomy and natural products.