桉树叶挥发油化学成分的研究

采用毛细管气相色谱-质谱（CGC-MS）联用技术对桉树叶挥发油的化学成分进行研究,经毛细管气相色谱分离出30个峰,共确认了其中21种成分,占总油量的97．57％。其主要成分是按油精、3,7,7-三甲基-二环[4．1．0]庚2-烯、α,α,4-三甲基-3-环已烯-1-甲醇、喇叭茶醇等。     

西洋参中挥发油化学成分的分析

利用气相色谱－质谱－计算机联用装置分析吉林栽培西洋参挥发油中的化学成分及相对含量。由于没有按照常规的乙醚提取，而紧 ８０％的甲醇提取，因此得到的挥发油成分及含量与文献报道有很大的差别，共鉴定出２３种化合物，其中醌类及酸类约占总挥发油含量的６５％，为该部分挥发油的主要成分。     

花椒挥发油的化学成分分析

1　引　　言花椒 (ＺａｎｔｈｏｘｙｌｕｍｂｕｎｇｅａｎｕｍＭａｘｉｎ)属于芸香科落叶灌木植物 ,具有浓烈芳香 ,是主要的调味香料 ,在烹调中常用作佐料 ,又可防腐。花椒还属于中国传统的有效高价值中药 ,它性热 ,味辛、入脾经胃 ,能散寒祛湿 ,止痛杀虫 ,并可除六腑寒冷。主治慢性肠胃炎 ,胃腹冷痛及慢性关节炎、肌肉风湿痛等疾病。国外对花椒类植物也进行了一定研究工作 ,据有关报道 ,花椒属植物的提取物或挥发油在抗病毒、杀病菌、微生物等方面有显著的功效。花椒粗提物有较强的杀虫、杀菌作用 ,它对玉米象、赤拟谷盗、储粮曲霉和青霉等…     

叶下花挥发油化学成分的GC/MS分析

叶下花(Ainsliaea pertyoidesFr.var.albo-tom en-tosaBeauverd)(又名白背兔耳风)为菊科帚菊木族兔耳风属药用植物。兔耳风属全世界70余种,我国有44种4变种,约占总数的37·5%。兔耳风属植物药用种类较多,广泛用于治疗感冒咳喘、风湿痹痛、跌打损伤、活血止血、肠炎痢疾、咽喉炎     

冷蒿挥发油化学成分的分离和鉴定

采用水蒸气蒸馏法提取了冷蒿挥发油,气相色谱-质谱联用结合计算机检索对其化学成分进行了分析和鉴定,共分离出106个峰,确定了101种化合物,它们主要是二甲基-甲撑基环庚(17.67%)、3,3,6-三甲基-1,5-庚二烯醇-2(16.40%)、3,3,6-三甲基-1,4-庚二烯醇-6(8.55%)、桉树脑(5.57%)、3,7-二甲-基2,6-辛二烯醇-1(3.85%)、神圣亚麻三烯(3.73%)、1-甲基-3-异丙基苯(3.26%)、桥环[2,2,1]萜烯(2.91%)、樟脑(2.26%)、香叶烯(2.20%),以上10种化合物占挥发油总量的66.40%。     

气相色谱-质谱法分析木奶果挥发油的化学成分

采用水蒸汽蒸馏法从大戟科木奶果中提取挥发油,用气相色谱-质谱对挥发油的化学成分进行了分析。鉴定出19种化合物,占总油量的100%,用面积归一化法测定了各成分的相对百分含量。木奶果挥发油主要成分为正十六碳酸、丁基甲氧基苯、9,12-十八碳二烯酸,分别占挥发油总量的29.53%、17.47%和11.59%,三者占其总量的58.59%。     

生姜挥发油的提取及其化学成分的气相色谱-质谱分析

本文对生姜挥发油的提取先采用水蒸气蒸馏法，然后对馏出液用已醚萃取，得到提取物Ⅰ，经GC／MS检测鉴定出40种化合物。对乙醚萃取后的馏出液选用乙酸乙酯进一步提取，用GC／MS检测还鉴定出28种化合物，提取出的挥发油重量占总油量39％。     

广东野菊花挥发油的化学成分

采用水蒸汽蒸馏法从野菊花中提取挥发油,试用不同类型的毛细管柱进行分析,找出了最佳分析条件,共分离出54个峰,用归一化法测定其相对含量,并用气相色谱-质谱法对化学成分进行鉴定,共鉴定18个成分,占挥发油总量的99.8%。     

独活挥发油化学成分的气相色谱-质谱法测定

采用水蒸气蒸馏法从独活中提取挥发油。采用不同类型的毛细管柱进行分析 ,找出最佳分析条件 ,共分离出50个峰 ,用归一化法测定其相对含量 ,并用气相色谱 -质谱法对化学成分进行鉴定 ,共鉴定了40个成分 ,占挥发油总成分的80 %以上。     

野菊花挥发油化学成分的气相色谱-质谱联用分析

野菊花(Flos chrysanthemum indici)为菊科植物野菊((7hrysanthemum indicum L．)的头状花序,临床应用广泛。它主要含挥发油、黄酮、倍半萜及其他成分,其中挥发油对肺炎双球菌、流感杆菌、金黄色葡萄球菌等均有较强的抑制作用。关于野菊花挥发油的化学成分已有报道。由于生长环境的差异,不同产地的野菊花药效差异较大,挥发油中各组分含量也有较大差异。我们采集江西产野菊花药材,采用气相色谱-质谱联用(GC—MS)技术,     

Structure elucidation and complete NMR spectral assignments of a novel sesquiterpene glycoside from Ixeris sonchifolia

A novel sesquiterpene glycoside was isolated from the whole plant of Ixeris sonchifolia. The structure was established as 1(10)E-4Z-3alpha-hydroxy-germacra-1(10),4,11(13)-trien-6, 12-olide-14-O-beta-D-glucopyranoside (1) on the basis of spectroscopic techniques and chemical analysis.     

Chemical composition and antimicrobial activity of the essential oil of Sagittaria trifolia

The essential oil of Sagittaria trifolia, a well-known famous medicinal foodstuff in China, was analyzed for the first time using GC-MS. Twenty-eight constituents were identified. The major components of the oil were hexahydrofarnesyl acetone (62.3%), tetramethylhexadecenone (5.8%), myristaldehyde (4.7%), n-pentadecane (2.9%), and 2-hexyldecanol (2.9%).The antimicrobial activity of the essential oil was evaluated against seven microorganisms, including two clinically isolated strains and five reference strains, using microbiological cylinder plate assay and broth microdilution methods. The results showed that the oil had a significant antimicrobial effect on four of them. This antimicrobial activity can partly explain why the oil is used medicinally during childbirth and for skin diseases in Chinese traditional medicine. Published in Khimiya Prirodnykh Soedinenii, No. 5, pp. 419–420, September–October, 2006.     

Chemical composition and antibacterial activity of the essential oil from Agathis dammara (Lamb.) Rich fresh leaves

The essential oil of fresh leaves from Agathis dammara (Lamb.) Rich was extracted using hydro-distillation, and GC-FID and GC–MS were used to analyse the essential oil. Nineteen compounds were identified, among which the major components were limonene (36.81%), β-bisabolene (33.43%) and β-myrcene (25.48%). In the antibacterial test, disc diffusion method and micro-well dilution assay proved that the essential oil had significant antibacterial activities. The inhibition zones against Staphylococcus aureus and Pseudomonas aeruginosa were 23.7 and 23 mm, respectively, which demonstrated that the inhibition effects were greater than positive control (10 μg/disc streptomycin). And the lowest MIC value of the essential oil was found against S. aureus (1.25 mg/mL) and Bacillus subtilis (1.25 mg/mL). This is the first report on the antibacterial activities of A. dammara essential oil.     

Complete 1H and 13C NMR assignments of sesquiterpene glucosides from Ixeris sonchifolia

Four sesquiterpene glucosides were isolated from Ixeris sonchifolia Hance. The structure of a new compound (1) was assigned as 9beta-monohydroxy-2,12-dioxo-guaia-3,11(13)-dien-1alpha,5alpha,6beta,7alpha,9beta,10alphaH-12,6-olide-9-O-beta-D- glucopyranoside (ixerinoside). In addition, unambiguous and complete assignments of (1)H NMR chemical shifts for crepidiaside A (2), ixerin Z (3), and 11,13alpha-dihydroixerin Z (4) are presented. The assignments were achieved by two-dimensional NMR (gCOSY, gHSQC, gHMBC, NOESY) and one-dimensional nuclear Overhauser effect (NOE) experiments.     

Chemical compositions and antimicrobial activities of the essential oil from Pterocarya stenoptera C. DC

Abstract

The present study investigated the chemical compositions and antimicrobial activities of essential oil from Pterocarya stenoptera. The essential oil obtained by hydrodistillation from the dried leaves of P. stenoptera was analysed by GC–MS and 39 constituents accounting for the total 90.44% of the oil were identified. The main constituents were δ-cadinene (24.83%), caryophyllene oxide (9.10%), α-cadinol (7.48%) and β-elemene (6.24%). The antimicrobial activity of the oil was evaluated by disc diffusion and broth microdilution methods. The essential oil was found to show broad-spectrum antimicrobial activities against all the tested microorganisms. Bacillus subtilis was the most sensitive strain with the minimum inhibitory concentration of 0.23?mg/mL. The results suggested that the essential oil was a potential source of natural antimicrobials in food preservation and pharmaceutical industry.     

Chemical composition and cytotoxicity of the essential oil from different parts of Datura metel L.

The essential oil from different parts of Datura metel L. were extracted using hydrodistillation and GC–MS was used to analyse the essential oil. The main components of flowers were ketone (23.61%) and ethyl palmitate (15.84%). The main components of leaves were ketone (18.84%) and phytol (18.71%). Ketone (39.45%) and phytol (31.32%) were the major components of petioles. Palmitic acid (30.60%) and ethyl linoleate (21.56%) were the major components of seeds. The major ingredient of roots was palmitic acid (52.61%). The main ingredients of the stems were palmitic acid (38.38%) and ethyl linoleate (17.38%). All the different parts of essential oil were screened for cytotoxicity. The roots and stems showed the inhibitory effects against HepG-2 with IC₅₀ levels of 613.88 and 341.12 mg/L. The leaves and roots showed the inhibitory effects against HeLa with IC₅₀ levels of 267.76 and 348.35 mg/L. All the six parts have inhibitory effects against SGC-7901 cell lines.     

菥蓂籽挥发油的GC/MS分析

菥蓂(Thlaspi arvenseLinn),又名苏败草、遏蓝菜、苦苦菜、罗汉菜,属双子叶植物药十字花科一年生草本植物,我国大部分地区均有分布,在川西北草原储量较丰富[1]。它既是一种中药材,又是一种可食用野生资源和潜在的油料作物来源。其种子含黑芥子甙(Sinigrin)及34%左右的油脂,味辛     

Chemical composition of the essential oil of Kaliphora madagascariensis Hook. f.

Kaliphora madagascariensis is an evergreen shrub or small tree endemic to Madagascar where it is traditionally used for the treatment of persistent cephalalgia by a strong inhalation of its odour. In this work, we analysed for the first time the essential oil obtained from leaves by Gas Chromatography-Mass Spectrometry. The chemical composition was dominated by oxygenated sesquiterpenes (68.1%), with caryophyllene oxide (14.7%) and β-eudesmol (10.7%) as the most abundant constituents. These compounds are endowed with documented healthy effects such as analgesic, anti-inflammatory, neuritogenic, antiepileptic and hypotensive, and its abundance might explain the traditional use of the plant in Madagascar.     

Production of essential oil from Cumin seeds

Steam distillation of cumin (Cuminum cyminum L.) seeds was studied to show the effects of particle size, batch size, and distillation rate on their essential oil recovery. Experiments were carried out both on bench and pilot scale. The composition of the oil was analyzed by GC/MS.Published in Khimiya Prirodnykh Soedinenii, No. 3, pp. 214–216, May–June, 2000.