Volatile constituents of Cupressus stephensonii heartwood

Nonpolar volatile extractives of Cupressus stephensonii heartwood amounting to 1·3% (drywood weight basis) were analyzed for their constituents and the main component was found to be carvacrol (78%). Tropolones (17%) were composed largely of β-thujaplicin and nootkatin with γ-thujaplicin in secondary quantities. Acids were low (1·7%). Neutral constituents (3·4%) contained α-pinene (8%), 4-terpinenol (27%), and methyl 4-trans-dehydrogeranate (45%).     

Volatile acids of sun-cured greek Nicotiana tabacum

The volatile acids of sun-cured Greek tobacco have been studied. Examination of this material by GC-MS supplemented by other spectroscopic methods and in some instances by synthesis, has permitted the identification of nearly a hundred compounds. About half of them have not been encountered previously in tobacco or tobacco smoke, and the majority of the new compounds are straight and branched-chain unsaturated acids and aromatic acids. Five of the oxygenated acids are evidently seco- or nor-terpenoids.     

Phenolic constituents of tomato fruit cuticles

Chalconaringenin, naringenin, naringenin-7-glucoside, and m- and p-coumaric acids have been identified in the fruit cuticles of three tomato cultivars. The phenolic content of the cuticles increased substantially during fruit development, those from immature green and mature ripe fruits of cv Ailsa Craig yielding respectively 2.8 and 61 μg/cm² (representing 1.4 and 6% of the total membrane wt). Coumaric acids, present only in the ‘cutin-bound’ phenolics, increased from 2 to 24 μg/cm² during fruit development. Flavonoids, synthesized mainly during the climacteric, occurred free in the epicuticular (0.3–7.2 μg/cm²) and cuticular (0.7–5.7 μg/cm²) phenolics but the major part of this class of constituents in ripe fruit cuticles was also ‘bound’ to the cutin matrix (30–43 μg/cm²). The composition of the flavonoid fraction was controlled by the spectral quality of incident radiation, red light favouring the formation of chalconaringenin.     

鸡骨香的萜类成分研究

对传统药用植物鸡骨香的化学成分进行了研究,从鸡骨香根中分离得到4个已知萜类化合物,分别鉴定为:Mallotucin B(Ⅰ)、Cyperenoicacid(Ⅱ)、Ent-spathulenol(Ⅲ)、Cyperenol(Ⅳ)。其中化合物Mallotucin B、Ent-spathulenol和Cyperenol均为首次从鸡骨香根中分离得到。     

木兰属萜类生源途径及其分类学意义

选取木兰科木兰属15种植物的108种萜类化合物成分作为研究资料,根据各种萜类化合物成分的结构类型从中找出34条可能的生源合成途径,并将各种生源途径作为数量性状,用聚类分析的方法得到木兰属各分类群之间的相关系数、作出树形分支图,根据所含萜类比较复杂成分的比例对该属的演化关系作出推论,结果表明木兰亚属与玉兰亚属是属于平行演化的两支。     

Phenolic constituents of the cell walls of monocotyledons

Monocotyledons of 104 species in 52 families were divided into two groups depending on the UV fluorescence behaviour of their cell walls. The unlignified cell walls of the first group, fluoresced blue, which changed to green with increased intensity after treatment with NH₃ due to the presence of bound ferulic acid. The isolated cell walls of members of the first group were shown to contain bound ferulic, p-coumaric and diferulic acids. These acids were absent from cell walls of the second group. The first group contained families of the Commelinidae of Cronquist, the Palmae (part of the Arecidae), and the Philydraceae, Pontederiaceae, and Haemodoraceae (all part of Liliidae). The other families of the latter two subclasses and those of the Alismatidae belonged to the second group.     

Phenolic constituents of Iris milesii rhizomes

Analysis of a methanol extract of the rhizomes of Iris milesii resulted in the isolation of a new isoflavone, 5,6,7,4′-tetrahydroxy-8-methoxyisoflavone along with prunetin, sakuranetin, 2:6-dimethoxy-1,4-benzoquinone, tectorigenin, irigenin,4-β(D-glucosyloxy)-ferulic acid methyl ester, quercetin-3-methyl ether, tectoridin, iridin and iristectorin B.     

Volatile constituents of Cupressus dupreziana and the sesquiterpenes of Cupressus sempervirens

Analysis of wood essential oil of Cupressus dupreziana revealed 26 components: 13 monoterpenes and 13 sesquiterpenes. The main components were carv     

Phenolic constituents of Semecarpus anacardium

GLC-MS analysis of methylated bhilawanol from S. anacardium nuts and its oxidation product, the methyl ester of an aromatic carboxylic acid, conclusively proved that it contains more than seven closely related compounds. Two of them are major components which were isolated and shown to be 1-pentadec-Δ^5′-enyl-2,3-dimethoxybenzene (I) and 1-pent biflavanoids A, B and C have been also isolated from defatted nuts of S. anacardium. The first of these has been characterized as its methyl ethers. A₁ and A₂, for which biflavanone structures (VI) and (VII) are suggested on the basis of chemical and spectral evidence. The biflavanones B and C have been also characterized as their methyl ethers. Suggested structures are O-methyl derivatives of a IB-3′, IIA-8-binaringenin (XIV) for the former and IB-3′, IIA-8-biliquiritigenin (XV) for the latter.     

Estrogenic constituents of the heartwood of Dalbergia parviflora

From the heartwood of Dalbergia parviflora, five compounds, dalparvin A (1), B (2), C (3), dalparvinol C (4), and neokhriol A (5), along with 11 known compounds, kenusanone G (6), cajanin (7), sophorol (8), alpinetin (9), hesperetin (10), 3'-O-methylorobol, odoratin, (2R)(3R)-2,3-trans 7-hydroxy-5-methoxydihydroflavonol, (6aR, 11aR)-3,8-dihydroxy-9-methoxypterocarpan, (6aR, 11aR)- vesticarpan, and methyl-3,4-dihydroxy-2-methoxybenzoate were isolated and characterized. Isolates were evaluated for their cell proliferation stimulatory activity against MCF-7, T-47D, and BT20 human breast cancer cell lines. Along with 7-10, two compounds 2 and 3 stimulated not only MCF-7, but also T-47D human breast cancer cell proliferation. Compound 6 had activity only against MCF-7 cells, and the activity of 7 was more than equivalent to that of daidzein. On the other hand, none of the isolates had any significant effects on BT20 cell proliferation, and these results indicated that the stimulative activity of these compounds was not general to any cell proliferations. Furthermore, these compounds were tested in the estrogen-responsive transient luciferase reporter assay.     

西南獐牙菜化学成分的研究

对龙胆科(Gentianaceae)獐牙菜属植物西南獐牙菜(Swertia cincta)进行化学成分研究,从中分离鉴定了15个化合物,包括5个裂环烯醚萜(苷),2个三萜,1个口山酮,4个芳香酸(醇),以及3个其它类成分.以上化合物分别为:獐牙菜苦苷(swertiamarin,1),龙胆苦苷(gentiopicroside,2),红白金花内酯(erythrocentaurin,3),(-)龙胆内酯((-)-gentiolactone,4),angelone(5),齐墩果酸(olcanolic acid,6),3-表-蒲公英赛醇(3-epi-tarax-erol,7),当药醇苷(swertianolin,8),间羟基苯甲醇(m-hydroxybenzyl alcohol,9),邻苯二甲酸二甲酯(dimethyl phthalate,10),邻苯二甲酸二异丁酯(diisobutyl phthalate,11),3,4-二羟基苯甲酸(12)和正三十一烷醇( n-hentria-contanol,13),β-谷甾醇(β-sitosterol,14)和胡萝卜苷(daucosterol,15).其中化合物4-5,7,9～13和15为首次从西南獐牙菜中分离得到.