东阳西垣香榧外种皮挥发油成分分析

采用水蒸汽蒸馏法提取东阳西垣香榧的新鲜外种皮中的挥发油,总提取率为6．8％。并以气相色谱-质谱联用技术对其成分进行分析,从中分离出42个色谱峰,鉴定出了30种成分。相对含量超过1％以上的组分有11种,占总含量的90．46％,分别是柠檬烯39.38％,1R-α-蒎烯31．61％,β-水芹烯5．13％,（1S-顺）-1,2,3,5,6,8a-六氢-4,7-二甲基-1-（1-甲基乙基）-萘4．00％,大拢牛尔烯3．73％,β-蒎烯2．40％,茨烯2．11％,反-β-金合欢烯1．82％,异松油烯1．47％,可巴烯1．28％,2-异丙基-5-甲基-9-亚甲基-二环[4,4,0]1-癸烯1．26％。其中柠檬烯和α-蒎烯含量较文献报道高,实验为东阳西垣香榧外种皮的进一步开发利用提供了科学依据。     

静态顶空—气相色谱质谱联用法分析金丝皇菊的挥发性成分

菊花种类丰富,不同的菊花品种挥发性成分不同。本文通过静态顶空-气相色谱质谱联用法分析了金丝皇菊的挥发性成分,共鉴定出28种物质,占挥发性含量的90.34%,其中萜类物质占82.33%。主要成分有桉叶素(36.84%)、合成右旋龙脑(13.07%)、L-乙酸冰片酯(11.14%)、2,6,6-三甲基-二环[3.1. 1]庚-2-烯-4-醇乙酸酯(7.20%)、(1S)-(-)-α-蒎烯(4.38%)、莰烯(4.20%)、β-萜烯(1.32%)等。萜类物质的存在决定了金丝皇菊特有的药用价值和茶饮味道。     

摩洛哥鼠尾草挥发油化学成分分析

以摩洛哥产鼠尾草为研究对象,以水蒸气蒸馏法提取其中的挥发油成分,并详细考察了提取时间、浸泡时间和物料比等因素对挥发油提取效率的影响.通过气相色谱-质谱联用技术对鼠尾草挥发油的化学成分进行检测,经G1701B化学站检索NIST98谱图库,确认样品中的化学成分,并以峰面积归一化法计算各化学成分的相对含量.实验结果表明:摩洛哥鼠尾草挥发油的最佳提取条件为提取时间2.5 h、浸泡时间2 h、物料比1:11、出油率为1.85％.挥发油中共鉴定出38种物质,主要成分为桉叶油醇、樟脑、β-蒎烯、(1R)-(+)-α-蒎烯和莰烯.     

毕拨挥发油化学成分的固相微萃取研究

采用固相微萃取/气相色谱／质谱法分析毕拨挥发油化学成分,在毕拨挥发油化学成分中,共分离出115个成分,鉴定出其中的81个成分,已鉴定成分占总挥发油成分峰面积的97．83％;主要为萜烯类及其含氧衍生物等化合物,含量较高的成分是α-律草烯（4．44％）、α-姜黄烯（4．94％）、大根香叶烯-d（5．67％）、十五烷（12．30％）、β-没药烯（6．20％）、十七（碳）-8-烯（6．66％）、8-十七（碳）烯（9．29％）、十七烷（9．07％）等化合物。     

油松松针中挥发油的GC—MS分析

目的：利用GC—MS方法分析油松松针中挥发油成分．方法：以水蒸汽蒸馏方法提取油松松针挥发油,利用气相色谱——质谱联用技术对提取的挥发油成分进行分析．结果：利用谱图检索油松松针中挥发油的主要有12种主要成分,分别为龙脑（45．133％）、醋酸冰片酯（11．212％）、1R-α-蒎烯（11．173％）、β-石竹烯（10．291％）、杜松烯（7．083％）、松油烯-4-醇（4．226％）、古巴烯（3．368％）、1,7-辛二烯、3-亚甲基（1．985％）、β-蒎烯（1．932％）、8-亚甲基-（1α,2α4α,5α）三环[3,2,1．02,8]辛烷（1．785％）、莰烯（1．328％）、反-松香芹醇（0．480％）．结论：油松松针中挥发油是一种具有较好应用前景的天然药用资源．     

不同产地金银花挥发性成分的研究

对不同产地金银花挥发性化学成分进行研究.采用同时蒸馏萃取法(SDE)提取金银花的挥发油.经气相色谱-质谱联用技术鉴定各色谱峰的化学成分,用峰面积归一化确定各化学成分相对含量.实验选用的6产地金银花样品中,辽宁、宁夏、安徽、江西金银花的相同成分相对较多,但在相对百分含量上仍有较大差异;山东、云南金银花挥发油含量及类别较其它地区差异性较大.辽宁、安徽金银花挥发性成分中苯乙醇相对含量最高,分别为17.07％和15.75％;宁夏、江西金银花挥发性成分中棕榈酸相对含量最高,分别为23.46％和11.58％;山东金银花挥发性成分中柠檬烯相对含量最高为16.83％;云南金银花挥发性成分中3,7-二甲基-1,6-辛二烯-3-醇相对含量最高为29.13％.     

罗布麻叶挥发油的提取与气相色谱-质谱分析

用同时蒸馏装置萃取了罗布麻叶中挥发油，测得提取率为1．51％．并采用气相色谱-质谱联用技术对罗布麻的挥发性成分进行了分离鉴定．分离出37种成分，占挥发油总含量的97．83％．采用峰面积归一化法确定了各成分的相对含量，其中主要成分为：双烯桉叶（17．10％），薄荷醇（7．03％），5，6，7，7a-四氢化4，4，7a-三甲基-2（4H）苯并呋喃（6．64％），三甲基-8-亚甲基-十氢化4-亚甲基萘醇（5．25％），氧化石竹烯（3．94％）．     

固相微萃取法快速分析迷迭香精油的化学成分

目的:快速分析迷迭香精油化学成分.方法:利用固相微萃取/气相色谱/质谱(SPME-GC-MS)联用技术对责州迷迭香精油样品成分生产的5个样品进行研究.结果:分别鉴定出28种化学成分,皆占迷迭香精油总成分的99.12％,99.22％,91.80％,99.19％,98.8％.结论:迷迭香精油主要化学成分是α-蒎烯、莰烯、β-蒎烯、按油精、(-)-樟脑、龙脑等组分.     

冷水花挥发油化学成分的GC—MS分析

利用毛细管柱气相色谱-质谱联用（GC—MS）技术研究了冷水花挥发性化学成分,用色谱峰面积归一化法计算各成分的相对百分含量。分离出56个峰,鉴定了其中的30种成分,占挥发油的90．14％,其中主要成分为烯类化舍物（9个）占挥发油总含量的48．29％、脂肪酸类化合物（7个）占挥发油总含量的13．10％、醇类化合物（5个）占挥发油总合量的9．51％,其中多种成分具有药理活性。通过对冷水花挥发性化学成分的分析,为其合理开发提供了科学依据。     

光亮杜鹃中挥发性成分分析

对光亮杜鹃茎和叶的挥发油化学成分进行分析研究.采用水蒸气蒸馏法分别提取光亮杜鹃茎和叶中的挥发性成分,GC/MS法分析,NIST谱库检索,并计算各成分的相对百分含量.结果表明:光亮杜鹃枝和叶中分别检出81种和70种成分.其中,(E,E)-3,7-二甲基-10-(1-甲基亚乙基),-3,7-环癸二烯-1-酮是光亮杜鹃茎和叶挥发油中含量最高的成分,相对含量分别为25.695％和21.481％.其次,茎的主要成分为甘香烯,相对百分含量为13.321％;叶的主要成分为甲基-2-萘甲醇,相对百分含量为9.080％.光亮杜鹃中茎和叶的挥发油无论在成分还是含量方面都存在一定差异.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.