GC-MS联用法测定镰形棘豆石油醚浸提物的化学成分

采用GC MS联用方法测定和鉴定了采自青海贵德地区的镰形棘豆石油醚部位的化学成分 ,共鉴定出 5 7个成分 ,占该部位的 86 70 % ,其中 (z,z,z) 9,12 ,15 十八碳三烯 1 醇 14 73 % ,(E) 1 (2 ,6 二羟基 4 甲氧基 ) 3 苯基 2 烯 1 酮 7 68% ,十六碳酸乙酯 6 4 9% ,亚麻油酸乙酯 4 3 5 % ,2 3 ,2 4 双氢豆甾醇 4 3 0 % ,2 苯基 5 ,7 二羟基双氢黄酮1 93 % .     

香料的热脱附-气质联用指纹图谱偏最小二乘判别分析与差异表征

 采集72个来自2类不同风格特征香料的热脱附-气质联用指纹图谱,结合偏最小二乘判别分析（PLS-DA）,建立2类不同风格特征香料的类模型.使用26个验证样品对类模型进行验证(在P>0.05的条件下),结果表明,验证样品均获得了正确的分类,类模型判别效果良好;同时,通过因子载荷矩阵分析,计算各化学组分对2类香料分类的贡献率,表征2类香料化学组分的差异,结果令人满意.     

杜仲叶挥发油的GC—MS分析

本文对生长了一年的杜仲树叶中的挥发油采用色谱质谱联用分析技术分离鉴定。总共分出大小４５种成分，用谱图检索确认出其中的２５种，并用峰面积归一化法，给出了其相对含量确认部分占８７．６％。     

大气飘尘中硝基多环芳烃（NO2—PAH）的分析方法

研究大气飘尘中硝基多环芳烃（ＮＯ２－ＰＡＨ）的分析方法,在毛细管气相色谱－ＥＣＤ（ＧＣ－ＥＣＤ）上比较了冷柱头进样（Ｏｎ－Ｃｏｌｕｍｎ）和不分流进样（Ｓｐｌｉｔｌｅｓｓ）两种方法对ＮＯ２－ＰＡＨ可能产生热降解的影响．用ＧＣ－ＭＳ化学电离负离子方法在线加入含氟试剂Ｎ（Ｃ４Ｆ９）３,使ＮＯ２－ＰＡＨ衍生化或生成稳态负离子,从而大大提高其分析的灵敏度．     

皂角刺中5个白桦脂酸型三萜的分离及抗菌

目的考察中药材皂角刺中白桦脂酸型三萜类化合物化学成分的组成及其抗菌活性。方法用溶剂萃取、反复柱层析方法,分离纯化皂角刺中白桦脂酸型三萜类化合物,并通过NMR,MS等波谱技术确定其化学结构;用纸片扩散法测定化合物的抗菌活性。结果从皂角刺中分离得到5个白桦脂酸型三萜类化合物,结构鉴定为白桦脂酸(1),alphitolic acid(2),3β-O-trans-p-coumaroyl alphitolic acid(3),3β-O-trans-p-caffeoyl alphitolic acid(4)和zizyberanalic acid(5)。5个化合物对试验菌表现出强弱不等的抑制活性。结论中药材皂角刺中一系列白桦脂酸型三萜类化合物,具有强弱不等的抗菌活性,应该和皂角刺的"搜风、拔毒"功效有关。     

An evidence for the strong association of <Emphasis Type="Italic">N</Emphasis>-methyl-2-pyrrolidinone with some organic species in three Chinese bituminous coals

Three Chinese bituminous coals collected from Shenfu, Heidaigou and Feicheng coal fields were respectively extracted with carbon-disulfide/N-methyl-2-pyrrolidinone （CS2/NMP） mixed solvent （volume ratio 1：1） at room temperature followed by distillation of CS2 under ambient pressure and subsequent removal of most of NMP by distillation at 110℃ under reduced pressure to afford mixed solvent-extractable fractions （MSEFs） with small amount of NMP. Acetone-extractable fraction 1 （AEF1） was obtained by extracting each MSEF under ultrasonic irradiation at room temperature and subsequently using a Soxhlet extractor. Direct extraction of each bituminous coal affords acetone-soluble fraction 2 （AEF2）. GC/MS analysis shows that m/z of base or secondary peak in mass spectra of a series of components from each AEF1 is 98, whereas such components were not detected in AEF2. Since m/z of base peak in mass spectrum of NMP itself is 99, the base or secondary peak at m/z 98 should result from loss of α-H from NMP, i.e., NMP is strongly associated with some organic species （OSs） and thereby the components detected with base or secodary peak at m/z 98 in their mass spectra should be associated NMP-OS.     

甘青青兰挥发性成分GC/MS分析

目的：分离鉴定出甘青青兰（Dracocephalum tanguticum Maxim.）挥发油的化学成分.方法：用气相色谱-质谱（GC/MS）联用技术及峰面积归一化法测定各组分的相对含量.结果：共鉴定出23种化合物,占总色谱峰总面积的87.46%.结论：甘青青兰挥发油中的化学成分主要为[-]-反-松香芹乙酯和桉油精,两者分别占总挥发油中化学成分的60.30%和9.31%.     

连续2D TOF法MRA对椎动脉病变的临床应用价值

目的：采用连续2DTOF法MRA无创成像技术探讨椎动脉病变的MRA表现及其临床应用价值．方法：对350例椎动脉病变病人和50例正常人分别进行磁共振血管成像,并对检查结果进行分析研究．结果：把正常人椎动脉平均分三段测量直径,得到MRA椎动脉正常值,左侧（4．1±0．79）mm,右侧（3．2±0．83）mm．350例椎动脉病变病人中,椎动脉扭曲26例,椎动脉狭窄320例（其中轻度狭窄85例,中度狭窄147例,重度狭窄88例）,椎动脉完全闭塞4例．结论：MRA是椎动脉病变的重要检查方法,对本病的诊断、分型、治疗方法的选择和预后判断具有重要价值．     

Mass spectrometry-based proteomics in the life sciences

Over the last 20 years, mass spectrometrybased proteomics has become an indispensable tool in the cellular and molecular life sciences. This has been enabled by the soft ionisation techniques of electrospray and matrix-assisted laser desorption-ionisation, which allow the gentle ionisation and vaporisation of large, thermally labile biomolecules. Innovative instrumentation designs and biochemical strategies have brought success in the large-scale identification and quantification of proteins, as well as the characterisation of their complexes and post-translational modifications. This review describes the instrumentation used for proteomics research. It presents an overview of the current applications of mass spectrometry-based proteomics to the cellular and molecular life sciences, and discusses challenges that exist for research in the future.Received 7 January 2005; accepted 27 January 2005     

2,5-二芳基取代噁唑衍生物质谱裂分规律的研究

用E．I源,作出了十个2,5-二芳基取代唑衍生物的常规质谱,并采用B／E为常数联动扫描,找出了主要质谱峰的子离子,以此研究了该系列化合物质谱裂分规律、共同碎片离子的形成过程、R取代基对化合物质谱裂分规律的影响．