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1.
The phytochemical study of the leaves of Rhododendron amesiae (Ericaceae) led to the isolation and identification of 19 compounds, including six diterpenoids (1–6), six triterpenoids (7–12) and seven flavonoids (13–19). The chemical structures of these compounds were identified by spectroscopic data, as well as by comparison with previously reported data in literature. This is the first systematic study on the chemical constituents of Rhododendron amesiae. All the compounds were isolated from this plant for the first time. Compounds 12, 14 and 15 were first isolated and reported from the genus Rhododendron and the family Ericaceae. Furthermore, the chemotaxonomic significance of these compounds was discussed. 相似文献
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Phytochemical investigation of the roots of Sanguisorba officinalis L. led to the isolation of thirty-eight compounds, including seventeen triterpenoids (1–17), six monoterpenoid glycosides (18–23), six flavonoids (24–29), six phenols (30–35), two glycosides (36–37), and one lignan (38). The chemical structures of these compounds were elucidated on the basis of spectral data and by comparisons of spectroscopic data with reported values in the literature. Compounds 18, 29, and 36–37 were the first to be reported in the family Rosaceae, compounds 10, 12, 15, 27–28, and 38 were firstly identified from the genus Sanguisorba, and compound 11 was obtained from S. officinalis for the first time. The chemotaxonomic significance of these isolated compounds has also been discussed. 相似文献
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The phytochemical investigation on the aerial parts of Gendarussa vulgaris led to the isolation of one new triterpenoid derivative gvterpennoid B (1), one new natural product 3-(2-hydroxy-4,5-dimethoxyphenyl)propanoic acid (9), together with four known monoterpenoids (2–5) and three known phenylpropanoids (6–8). Structure elucidation of these compounds was performed based on NMR data and MS. Known metabolites (2–8) were isolated from the family Acanthaceae for the first time. Furthermore, the chemotaxonomic significance and plant distributin of the isolates were also discussed in this thesis. 相似文献
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Phytochemical investigation of Cajanus scarabaeoides (L.) Thouars (Fabaceae) led to the isolation of six compounds. The chemical structures of all compounds were determined by spectroscopic methods. All isolates were reported from this species for the first time. The presence of these compounds is consistent with the chemical classes reported from other members of the genus Cajanus. In summary, this study reported six compounds isolated from Cajanus scarabaeoides and discussed the plant chemotaxonomy of Cajanus genus. 相似文献
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A new apotirucallane-type triterpenoid, 3α-benzoate triterpenoid A (1), along with six known triterpenoids (2–7), one aromatic ester (8) and eight lignans (9–16), were isolated from the fruits of Melia azedarach Linn. The structure of 1 was determined by spectral analyses, including HR-ESI-MS, 1D NMR (1H NMR and 13C NMR) and 2D NMR (HSQC and HMBC) analyses. 10, 11 and 16 were reported for the first time from the family Meliaceae, 8 was identified from the genus Melia for the first time, and 2, 3, 5, 7, 9 and 12–15 were obtained from M. azedarach for the first time. The chemotaxonomic significance of these compounds is discussed. 相似文献
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Eight phenolic compounds, including two catechins (1 and 2), two proanthocyanidins (3 and 4), three lignans (5–7), and one phenol (8), were isolated from roots of Vaccinium dunalianum Wight (Ericaceae), together with two triterpenes (9 and 10). All of them were isolated from the title plant for the first time. Their chemical structures were established based on the extensive MS and NMR spectroscopic analysis. Compounds 6–10 acquired initially from the genus Vaccinium, showed some significances in chemotaxonomy. 相似文献
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Sixteen compounds, including six flavonoids (1–6), one lignan (7), three megastigmanes (8–10), three triterpenoids (11–13), and three benzoic acid derivatives (14–16) were isolated and structurally elucidated from the pseudo-fruits of Hovenia dulcis. Their structures were analyzed by NMR spectroscopic and data comparison. Among them, compounds 4, 7–11, 13, 15, and 16 were isolated from the Hovenia genus for the first time. The chemotaxonomic significance of the isolates was also described, which revealed a relationship between H. dulcis and H. acerbar as well as other species belonging to the Rhamnaceae family. 相似文献
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Phytochemical investigation of Stenotaenia macrocarpa Freyn & Sint. (Apiaceae) led to the isolation of ten known compounds: eight flavonoids (1–8) and two furanocoumarins (9–10). The chemical structures of the compounds were elucidated based on 1D and 2D NMR and MS spectra, as well as comparison with the relevant literature data. To the best of our knowledge, this is the first detailed phytochemical study about Stenotaenia macrocarpa and the first report on the isolation of all the compounds from the genus Stenotaenia, and manghaslin (2) and its methoxylated derivative typhaneoside (3) from Apiaceae. The chemotaxonomic significance of isolates was also discussed. 相似文献
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Twenty-one compounds, including ten triterpenoids (1–10), two sterols (11 and 12), six flavonoids (13–18), and three cerebrosides (19–21) were isolated from the fruit of Zizyphus jujuba Mill. var. spinosa (Bunge) Hu ex. H. F. Chou. The structures were elucidated by spectroscopic methods and by comparison of their reported spectral data. These compounds have shown the relationship between this plant and other species from the Rhamnaceae family. 相似文献
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16 triterpenoid saponins including two new compounds were isolated from the seeds of A esculus sylvatica W. Bartram. The two new saponins were assigned as 3-O-[β-D-glucopyranosyl-(1 → 2)]-α-L-arabinofuranosyl-(1 → 3)-β-D-glucuronopyranosyl-21,22-O-ditigloyl-3β,16α,21β,22α,24,28 hexahydroxyolean-12-ene (aesculioside S1, 1) and 3-O-[β-D-glucopyranosyl-(1 → 2)]-α-L-arabinofuranosyl-(1 → 3)-β-D-glucuronopyranosyl-21-O-tigloyl-22-O-angeloyl 3β,16α,21β,22α,24,28-hexahydroxyolean-12-ene (aesculioside S2, 2). Aesculioside S1 and S2 displayed moderate cytotoxicity against human non-small cell lung cancer cells (A549) and prostate cancer cells (PC3) (GI50 ranged from 8.7 to 18.2 μM). The structural analysis of the saponins isolated from Aesculus supports the taxonomic placement of A. sylvatica under the section Pavia of Aesculus genus. 相似文献
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A phytochemical study of the whole plants of Chimaphila japonica Miq. led to the isolation of 23 compounds, including ten triterpenoids (1–10), six flavonoids (11–16), two sterols (17 and 18), two quinonoids (19 and 20), one saccharide derivative (21), one phenolic glycoside (22), and one megastigmane glycoside (23). The structures of these isolated compounds were identified using NMR spectroscopy (1H and 13C) by comparison with previously reported data. All compounds, except 19 and 22, were reported from C. japonica for the first time. Among them, 16 compounds (1–4, 6–9, 12, 13, 15, 16, 18, 20, 21, and 23) were reported from genus Chimaphila for the first time, while compounds 12, 16, and 23 were isolated from the Ericaceae family for the first time. The chemotaxonomic significance of the isolates was also discussed. 相似文献
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In the present study, eleven ursane triterpenoids (1—11), seven oleanane triterpenoids (12—18), one lupine sapogenin (19) as well as two sterols (20 and 21) were obtained from Ilex pubescens under the anti-platelet activity-oriented isolation. Among them, compounds 2 and 4 were isolated from I. pubescens for the first time, while the isolation of the compounds 12, 15, 16 and 17 was a new finding in the Aquifoliaceae family. Our present study exhibited the taxonomic relationships (similarities and differences) between I. pubescens and some other species of genus Ilex. The result also suggested that triterpenoids are the anti-platelet components which may be fingerprints and serve as biomarkers for seeking alternative sources for I. pubescens. 相似文献
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A phytochemical investigation of the aerial parts of Euphorbia formosana Hayata resulted in the isolation of 33 compounds, including various derivatives of ellagic acid and gallic acid. The chemical structures were elucidated by spectroscopic methods and comparison with relevant data from the literature. The chemotaxonomic significance and distribution of these derivatives of ellagic acid and gallic acid in the genus Euphorbia are discussed. 相似文献
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Thirty-four reported compounds were obtained from Anemone vitifolia Buch.-Ham., and were identified as triterpenoid saponins (1–28), flavonoid glycosides (29–32) and steroidal saponins (33–34). The structure of these compounds was determined by physicochemical constants and spectral analyses (NMR, MS, IR). Twelve compounds (7, 8, 10, 14, 20, 21, 23, 26–28, 30 and 32) were firstly identified in genus Anemone. Compounds 2, 4 and 14 can be considered as characteristic components of A. vitifolia. Finally, the chemotaxonomic significance of these compounds is discussed. 相似文献
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Cvejic JH Putra SR El-Beltagy A Hattori R Hattori T Rohmer M 《FEMS microbiology letters》2000,183(2):295-299
Hopanoid fingerprints allowed to differentiate bacteria formerly connected to the genus Pseudomonas. Whereas all strains related to Pseudomonas and Ralstonia were devoid of any detectable hopanoid, these pentacyclic triterpenoids were found in the Burkholderia species and in related soil isolates, which contained as main hopanoid a bacteriohopanetetrol carbapseudopentose ether, accompanied by significant amounts of its novel Delta(6) unsaturated homologue. Unsaturated hopanoids represent an extremely rare feature in soil bacteria and the only known indication for a catabolism of this pentacyclic carbon skeleton in bacteria. 相似文献