茵陈蒿精油化学成分研究

本文对茵陈蒿植物精油,采用ＧＣ／ＭＳ联用仪进行了化学成分研究,从检出的峰值中鉴定出２１种化合物,占样品总量的７３％,主要成分是：反式－－法呢烯占９．９％,甲基异子香酚占９．１％等     

黔产野生鱼腥草挥发油成分分析

对黔产野生鱼腥草（Ｈｏｕｔｔｕｙｎｉａ ｃｏｒｄａｔａ Ｔｈｕｎｂ）采取水蒸汽蒸馏和石油醚萃取的两种方法提取精油和净油。用ＧＣ／ＭＳ进行定性、定量分析,鉴定了其中４８种成分。比较两种提取方法的分析结果,发现净油中抗菌有效成分鱼腥草素（ｈｏｕｔｔｕｙｎｉｎｕｍ）的含量明显高于精油中的含量。除高沸点的脂肪酸酯外,两者其它化学成分无明显差异。     

芹菜子的超临界CO2流体萃取物的化学成分研究

本文采用ＧＣ和ＧＣ－ＭＳ技术,就芹菜子的超临界ＣＯ２流体萃取法（ＳＦＥ－ＣＯ２）精油和水汽蒸馏法（ＳＤ）精油的化学组成作了对比研究。结果表明,ＳＤ法精油的主要成分为单萜烯烃类物质,而ＳＦＥ－ＣＯ２法精油为苯并呋喃酮类化合物。共有３２种化合物被鉴定,其中两种为首次在芹子油中被发现。     

八角枫挥发油化学成分研究

八角栎是八角枫科八角枫属药用植物,分布较广。用气相色谱／质谱／计算机联用技术（ＧＣ／ＭＳ／ＤＳ）分析了水蒸气蒸馏得到的八角枫挥发油,鉴定出５９种化学成分,其主要成分为：１,８－桉叶素（４３．３２５％）、β－侧然（１０．７１３％）、丁香酚甲醚（７．０８８）、α－松油醇（７．０１７％）、α－蒎烯（５．８３０％）等５种化合物。被鉴定的５９种成分,共占挥发油总量的９７．０４％。     

湖北产黄花蒿精油化学成分研究

湖北产黄花蒿鲜花香气强烈、独特。用气相色谱／质谱／计算机联用技术,气相色谱ＫＯＶＡＴＳ保留指数以及标样叠加等方法从其精油中鉴定了４７个化合物,占精油总量的９９．０８％,其中蒿酮、１,８－桉叶油素,樟脑,烯、β－蒎烯、丁香烯、后２甲－基－６－甲撑－３－辛二烯－２－醇、香桧烯、异龙脑为主要成分。     

冷磨法来凤胡萝卜精油化学成分研究

采用ＧＣ－ＭＳ－ＤＳ技术对冷磨法来胡萝卜精油的挥发性成分进行分析，采用中性Ａｌ２Ｏ３柱层析法和紫外（ＵＶ）光谱对难挥发性有效成分进行分离和结构鉴定，研究表明：冷磨法胡萝卜精油含有α－蒎烯、β－蒎烯、胡萝卜次醇等６９种发挥性成分和丰富的胡萝卜素、叶黄素等难挥发性成分。     

湖北樟属数量化学分类研究

本文利用湖北樟属植物13号精油的气相色谱／质谱／电子计算机联用分析的结果,从 已鉴定出的108个化学成分中,筛选出30个主要成分,综合各种植物的17个主要形态特征,进行数量分类研究。数学分析结果揭示了樟属各种性状变化的规律性,尤其是形态特征 与化学成分之间的相关性。乙酸龙脑酯、反式-甲基异丁香酚和芳樟醇等重要香精原料的含 量,与某些形态特征的变化密切相关,罗勒烯可能是樟属分组的特征性成分。本文还在聚类 分析的基础上,进一步探讨了分类群的划分,并根据精油成分在不同种和同种不同类型中的 分布及含量,参照各分类群之间的相关系数,对其演化关系作出了推论。湖北樟属植物可能起源于我国西南的黄樟樟脑型,而芳樟和黄樟芳樟醇型则是最进化的类群。     

不同产地的千只眼精油化学成分的比较研究

云南省易门、通海和建水产的千只眼(Murraya tetramera Huang)枝叶分别经水蒸汽蒸馏得到精油,以气相色谱-质谱-计算机联用方法进行了定性、定量分析,共鉴定了27个化学成分。从易门产的千只眼精油中分离鉴定了21个化合物,为精油含量的99.69％;从通海产的千只眼精油中分离鉴定了18个化合物,为精油含量的99.44％;从建水产的千只眼精油中鉴定了20个化合物,为精油含量的99.72％。这些成分除石竹烯为倍半萜外,其余化合物都属于单萜或其含氧衍生物。三个产地的千只眼精油中都含主成分柠檬烯和紫苏醛。     

广东省3种野生香茅属植物精油的化学成分及含量分析

利用GC-MS技术分析了广东省3种野生香茅属(Cymbopogon Spreng.)植物叶片精油的化学成分及其相对含昔.结果表明,3种植物精油中的化学成分丰富.从橘草[C. goeringii(Steud.)A.Camus]精油中鉴定出25种化学成分,主要成分为香叶醇、香茅醛、Z-柠檬醛和E-柠檬醛,相对含量分别为26.56%、23.49%、19.65%和12.78%;从扭鞘香茅[C. hamatulus(Nees ex Hook.et Arn.)A.Camus]精油中鉴定出16种化学成分,主要成分为甲基丁香酚、甲基异丁香酚、3,5,3',5'-四甲基联苯和3,4-二乙基-1,1'-联苯,相对含量分别为19.46%、12.90%、16.88%和8.63%;从青香茅[C. caesius(Nees ex Hook.et Arn.)Stapf]精油中鉴定出28种化学成分,主要成分为甲基丁香酚、甲基异丁香酚和藜芦醛,相对含量分别为29.39%、22.25%和6.58%.香茅属植物的精油成分因种类和产地不同而有一定的差异,在实际生产中应根据需要对香茅属植物资源进行合理的开发和利用.     

中药郁金挥发油成分及挥发油中蜡质成分研究

对中药郁金挥发油成分进行ＧＣ－ＭＳ－ＤＳ分析,共分离得到１３７个气相色谱峰,鉴定出７３种成分,其中３６种为首次鉴定出。首次,作者对其挥发油中蜡质成分进行分离,经ＧＣ－ＭＳ－ＤＳ分析得其主要成分为长直链烷烃和长直链脂肪酸。     

The bioactive essential oil of Heracleum sphondylium L. subsp. ternatum (Velen.) Brummitt

The essential oil of Heracleum sphondylium L subsp. ternatun (Velen.) Brummit (Umbelliferae) was isolated from crushed seeds by means of hydrodistillation and analyzed by GC and GC/MS. Major components were identified as 1-octanol (50.3%), octyl butyrate (24.6%), and octyl acetate (7.3%). Furthermore, antimicrobial activity of the oil was evaluated using microdilution broth and agar diffusion methods. The bioactive constituent of the essential oil was determined as 1-octanol by using a bioautography assay.     

Identification of human whole saliva protein components using proteomics

The determination of salivary biomarkers as a means of monitoring general health and for the early diagnosis of disease is of increasing interest in clinical research. Based on the linkage between salivary proteins and systemic diseases, the aim of this work was the identification of saliva proteins using proteomics. Salivary proteins were separated using two-dimensional (2-D) gel electrophoresis over a pH range between 3-10, digested, and then analyzed by matrix assisted laser desorption/ionization-time of flight (MALDI-TOF)-TOF mass spectrometry (MS) and tandem mass spectrometry (MS/MS). Proteins were identified using automated MS and MS/MS data acquisition. The resulting data were searched against a protein database using an internal Mascot search routine. Ninety spots give identifications with high statistical reliability. Of the identified proteins, 11 were separated and identified in saliva for the first time using proteomics tools. Moreover, three proteins that have not been previously identified in saliva, PLUNC, cystatin A, and cystatin B were identified.     

中国砂仁属植物精油化学成分的研究(一)——阳春砂仁和广宁绿壳砂仁

阳春砂仁为我国著名中药材,广宁绿壳砂仁亦可入药,功效与阳春砂仁相仿,单产比阳春砂仁高。我们应用色谱和色谱/质谱联用方法,分析了它们的种子精油化学成分,分别鉴定出23和25个化学成分。两者相同的成分有α-蒎烯,β-菰烯,樟脑,龙脑,乙酸龙脑酯等16个,其中主要化学成分如樟脑,香叶烯,柠檬烯,樟脑烯,乙酸龙脑酯,龙脑等含量一致     

Chemical constituents of Lavatera trimestris L.--antioxidant and antimicrobial activities

Nine phenolic compounds, such as cis-/trans-p-coumaric acid, cis-/trans-p-coumaric acid methyl ester, glucose ester of cis-/trans-p-coumaric acid, caffeic acid methyl ester, kaempferol 7-O-beta-D-glucoside and kaempferol 3-O-beta-D-glucoside, were isolated from Lavatera trimestris flowers by chromatographic techniques and their structures were elucidated by spectral means (NMR). All compounds were tested for their antioxidant activity, while the methanolic extract was tested also for its antimicrobial activity. Also several non-polar constituents have been identified using GC and GC/MS methods. This is the first time that phenolic esters and non-polar constituents were identified in the flowers of L. trimestris L.     

Minor betalains in fruits of Hylocereus species

Betacyanins in peel and flesh of fruits of different Hylocereus species were identified by means of GC/MS, electrospray MS/MS, HPLC as well as (1)H and (13)C NMR techniques. As hitherto unknown pigments: betanidin 5-O-(2'-O-beta-D-apiofuranosyl)-beta-D-glucopyranoside, betanidin 5-O-(4'-O-malonyl)-beta-D-glucopyranoside and betanidin 5-O-[(5'-O-E-sinapoyl)-2'-O-beta-D-apiofuranosyl]-beta-D-glucopyranoside were elucidated. The sinapoyl moiety attachment position in the structure of betacyanins was established for the first time. The peel contained a more complex pattern of betacyanins with apiofuranosyl moiety. Other recently identified pigments were also present in the samples and their (1)H or (13)C NMR spectra were recorded. In the case of phyllocactin and its 4'-isomer the migration of the malonyl group was noticed.     

An approach to the chemotaxonomic differentiation of two European dog's mercury species: Mercurialis annua L. and M. perennis L

Mercurialis annua and M. perennis are medicinal plants used in complementary medicine. In the present work, analytical methods to allow a chemotaxonomic differentiation of M. annua and M. perennis by means of chemical marker compounds were established. In addition to previously published compounds, the exclusive presence of pyridine-3-carbonitrile and nicotinamide in CH(2) Cl(2) extracts obtained from the herbal parts of M. annua was demonstrated by GC/MS. Notably, pyridine-3-carbonitrile was identified for the first time as a natural product. Further chromatographic separation of the CH(2) Cl(2) extracts via polyamide yielded a MeOH fraction exhibiting a broad spectrum of side-chain saturated n-alkylresorcinols. While the n-alkylresorcinol pattern was similar for both plant species, some specific differences were observed for particular n-alkylresorcinol homologs. Finally, the investigation of H(2) O extracts by LC/MS/MS revealed the presence of depside constituents. Whereas, in M. perennis, a mixture of mercurialis acid (=(2R)-[(E)-caffeoyl]-2-oxoglutarate) and phaselic acid (=(E)-caffeoyl-2-malate) could be detected, in M. annua solely phaselic acid was found. By comparison with synthesized enantiomerically pure (2R)- and (2S)-phaselic acids, the configuration of the depside could be determined as (2S) in M. annua and as (2R) in M. perennis.     

Studies on the Chemical Constituents of Libanotis buchtormensis (Fisch) DC.

Eight crystalline substances were isolated from the Libanotis buchtormensis (Fisch) Dc. Five of them were identified as sesibricin, osthol, β-sitosterol, γ-sitosterol and D-mannitol by means of spectral analysis of UV, IR, NMR and MS: The sesibricin, osthol and γ-sitosterol are first time discovered in this plant.     

Magnetic resonance imaging for detecting lesions of multiple sclerosis: comparison with computed tomography and clinical assessment.

Eighty-two patients with known or suspected multiple sclerosis (MS) were examined by means of magnetic resonance imaging (MRI) with a 0.15-T resistive scanner. The diagnosis could be made by MRI in 34 (97%) of the 35 patients with chronic, well-documented, stable MS and by high-volume delayed x-ray computed tomography (HVD CT) in only 6 (54%) of 11 patients in this group. The stage of the disease as judged from the MRI scans correlated poorly with the clinical status of the patient and with the known duration of the disease. MRI identified 28 (88%) of the 32 patients in whom MS was subsequently diagnosed by a neurologist, whereas regular contrast or HVD CT identified only 11 (52%) of 21 such patients. MRI is the most sensitive imaging modality for MS but is of little value in assessing the severity of the disease: many of the lesions seen on MRI scans are clinically "silent", and MRI does not usually detect small lesions in the brainstem, cerebellum or spinal cord that may be clinically significant.     

药用异喹啉生物碱的研究：Ⅱ.地不容生物碱的研究

从地不容块根中分得四种生物碱A、B、C、D,经UV,IR,~1H-NMR,~(13)C-NMR,HRMS等方法鉴定了它们的结构,分别是cepharanthine (A),1-curine (B),isochondodendrine (C),ushinsunine (D)。C,D系首次从该植物中获得。     

Identification of phosphorylation sites on phosducin-like protein by QTOF mass spectrometry.

Post-translational modifications are used by cells to control the functions of proteins. Phosducin-like protein (PhLP) is a regulator of G-protein signaling that is post-translationally modified via phosphorylation. Phosphorylation of PhLP initiates its degradation by the 26S proteasome in serum-stimulated cells. In this report, we show that PhLP is phosphorylated in serum-stimulated Chinese hamster ovary (CHO) cells. Through the use of tandem mass spectrometry (MS/MS), the specific amino acids phosphorylated can be identified. A PhLP-myc-His construct was purified and phosphorylated by serum-stimulated CHO extract. The resulting protein was digested with trypsin and the peptides were identified by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Automated collison-induced dissociation data acquisition was compared with LC-MS/MS of manually chosen parents. In general, LC-MS/MS is superior for parent ions chosen manually, with the notable exception that automated fragmentation employs dynamic collision energy, which can result in higher quality collison-induced dissociation. Using the LC-MS/MS methods, four phosphorylation sites on PhLP were positively identified.