摘要:

Examination of the diterpenoid constituents of the dried leaves ofIsodon angustifoliusvar.glabrescensled to the isolation of five newent-kaurane diterpenoids, named as glabcensin Q-U (2–6). The structures were elucidated on the basis of spectroscopic evidences.

ISSN:1028-6020    

DOI:10.1080/10286029808039847

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Two new atisine-type diterpenoid alkaloids, beiwusine A (1) and B (2), have been isolated from the roots ofAconitum kusnezoffiiReichb. Their structures were established on the basis of spectroscopic data. Beiwusines A and B are the first examples of atisine-type diterpenoid alkaloids having a hydroxyl group at C-1. In addition, one known diterpenoid alkaloid spiramine H (3) has been isolated.

ISSN:1028-6020    

DOI:10.1080/10286029808039848

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A new dammarane-type saponin named quinquenoside L3 (1) together with vina-ginsenoside R3 (2) were isolated from the leaves and stems ofPanax quinquefoliumL. collected in Canada. On the basis of physicochemical and spectral evidences,1was established as 3-O-β-D-glucopyranosyl-20-O-[β-D-xylopyranosyl-(1 → 6)-β-D-glucopyranosyl] 20(S)-dammar-23-ene-3β, 12β,20,25-tetryol.

ISSN:1028-6020    

DOI:10.1080/10286029808039849

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Biotransformation of podophyllotoxin (PT) by several microbial species has been investigated. Among the fungi tested, it was found thatPenicilliumstrains can isomerize PT to picropodophyllin (PPT) in 8% yield and other strains also transform the substrate into the same product but with lower yield.

ISSN:1028-6020    

DOI:10.1080/10286029808039850

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Three new iridoids, named artselaenin I, II and III, were isolated from the whole plants ofPedicularis artselaeri, along with 11 known compounds, 8-epiloganic acid, 7-deoxy-8-epiloganic acid, plantarenaloside, mussaenoside, lariciresinol-4-O-β-D-glucoside, lariciresinol-4′-O-β-D-gluco-side, alaschaniosideA, cirtusinA, 2-(p-hydroxyphenyl)-ethanol 1-O-β-D-glucopyranoside, 3-methoxy-4-primeverosylacetophenone and adenine. Their structures were identified mainly by spectral evidence.

ISSN:1028-6020    

DOI:10.1080/10286029808039851

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Cell suspension cultures ofSolanum laciniatumwere able to transform exogenously inoculated salicyl alcohol into salicyl alcohol 7-O-β-D-glucopyranoside (isosalicin). The highest level of isosalicin (54.6 mg/g dry weight) in the cells was formed within 2 days after inoculation with salicyl alcohol (37.5 mg/flask containing 50ml of medium). The biotransformation capacity of the cell suspension cultures was about 31.1%.

ISSN:1028-6020    

DOI:10.1080/10286029808039852

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

From the dried flower-buds ofPanax ginsengC.A. Meyer, a new minor dammarane-type triterpene saponin named ginsenoside III together with nine known saponins was isolated. On the basis of spectral and chemical evidence, the structure of the new saponin was elucidated as 3-O-[β-D-glucopyranosyl(1 → 2)-β-D-glucopyranosyl]-20-O-β-D-glucopyranosyl-3β,12β,20(S)-trihydroxy-dammar-25-en-24-one.

ISSN:1028-6020    

DOI:10.1080/10286029808039853

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A new dibenzocyclooctadiene lignan named angustifolin D (1) together with four known lignans: kadsulignan L (2), kadsulignan N (3), schisantherin P (4) and meso-dihydroguaiaretic acid (5) were isolated from the stems ofKadsura angustifolia. Their structures and stereochemistries were elucidated by spectral studies. Compounds2and5showed moderate plateletactivating factor (PAF) antagonistic activities with IC50values of 2.6 × 10−5and 4.1 × 10−5M, respectively.

ISSN:1028-6020    

DOI:10.1080/10286029808039854

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A new flavone glucoside, 5,2′,6′-trihydroxy-7-methoxyflavone 2′-O-β-D-glucopyranoside has been isolated from the whole plant ofAndrographis alata. The structure was elucidated on the basis of spectral and chemical evidence.

ISSN:1028-6020    

DOI:10.1080/10286029808039855

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A new bio-active flavonol glycoside was isolated from the stems ofButea superbaRoxb, and its structure was determined by spectral analysis and chemical degradations as 3,5,7,3′,4′-pentahydroxy-8-methoxy-flavonol-3-O-β-D-xylopyranosyl(1 → 2)-α-L-rhamnopyranoside. The compound1showed antimicrobial activity against plant pathogenic fungiTrich viride, Asprgillus fumigatus, A. niger, A. terreus, Penicillium expansum, Helmitnhosporium oryzae, Botxitis cinerea, Rhizopus oligosporus, R. chinensis, Kelbsiella pneumoniae, Fusearium moniliformeand grampositive bacteriaStreplococcus pyogenes, Staphylococcus aureus, Bacillus subtilisgram-negative bacteriaEscherichia coli, Proteus vulgaris, Klebsiella pneumoniae, Pseudomonas aeruginosa. The maximum inhibitory effect was shown byH. oryzae, A. niger, B. cineraand gram-positive bacteria.

ISSN:1028-6020    

DOI:10.1080/10286029808039856

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor