Biodegradation of bisphenol A by cultured cells of Caragana chamlagu.
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The biological degradation of 2,2-bis(4-hydroxyphenol)propane (1; bisphenol A, BPA), a representative endocrine disruptor, was studied with plant-cultured cells of Caragana chamlagu. An initial BPA concentration of 425 microM in an aqueous solution was degraded by C. chamlagu at 25 degrees C for 2 days in the dark, and two intermediates were then completely dissipated after 10 days. (+info)
Oligomeric stilbenes from the root of Caragana stenophylla.
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Caragaphenol A (1), a new trimeric stilbene, was isolated from the roots of Caragana stenophylla (Leguminosae) along with three known oligomeric stilbenes: (+)-alpha-viniferin (2), miyabenol C (3) and kobophenol A (4). The stereostructure of 1 was elucidated by one- and two-dimensional (1D- and 2D-)-NMR spectral studies. (+info)
Antioxidant constituents of Caragana tibetica.
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Caragana tibetica KOM. (Fabaceae) is a medicinal plant that has been traditionally used in western part of China. In the course of our screening study on antioxidant activity of medicinal plants, the 70% acetone extract of the stems of C. tibetica was found to have a potent superoxide anion scavenging activity. Tibeticanol (1), a new piceatannol dimer possessing antioxidant activity, was isolated along with eleven known aromatic compounds. Their structures were elucidated on the basis of NMR and MS data. Enzyme oxidation of monomeric stilbene, piceatannol (3), with horseradish peroxidase and hydrogen peroxide yielded cassigarol E (5) and G (6) as major products. Most of the isolated compounds exhibited superoxide anion scavenging activity. (+info)
Simultaneous determination of the contents of three stilbene oligomers in Caragana sinica collected in different seasons using an improved HPLC method.
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The objectives of this research were to determine simultaneously the contents of two stilbene tetramers, carasinol B (1) and kobophenol A (2), and one stilbene trimer, (+)-alpha-viniferin (3), in the roots, tubers, and leaves of Caragana sinica in various seasons. A HPLC method has been developed for efficiently quantifying the three analytes in the plant. Using this method, different samples of Caragana sinica were evaluated. The results showed that the contents of 1, 2, and 3 in the roots were much higher than those in the tubers, and the contents of stilbene tetramers were maximal in winter while the contents of the stilbene trimer were maximal in summer. Compounds 1, 2, and 3 could not be detected in the flowers of Caragana sinica in our detection ranges. (+info)
Responses of Caragana korshinskii to different aboveground shoot removal: combining defence and tolerance strategies.
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BACKGROUND AND AIMS: It is generally assumed that plants respond to natural enemies by either allocating resources to resistance traits or compensating for damage. This study evaluated how different methods of artificial shoot removal influence two alternative strategies (i.e. tolerance and defence) of Caragana korshinskii in the semi-arid area of China. METHODS: Zero per cent (control), 30% (30%) and 60% (60%) of the main shoot length and 25% (25%), 50% (50%) and 100% (100%) of the numbers of main shoots were removed from shrubs. KEY RESULTS: Moderate clipping treatments [30% removal of partial shoot length (RSL), 25% removal of shoot number (RSN) and 50% RSN] improved seed production, whereas the most intensive clipping treatments (60% RSL and 100% RSN) with most or total removal of potential flower buds reduced current reproduction fitness compared with controls. All treatments produced a similar leaf phenolic content, with the exception of 100% RSN which resulted in a low leaf phenolic content. In spite of a substantial investment in regrowth, clipped plants increased biomass allocation to physical defence. Control plants almost did not grow, had lower levels of physical defence and a lower photosynthetic rate, mobilized fewer carbohydrates from roots and produced more flowers. However, their current fitness was lower than that of plants undergoing clipping treatments (30% RSL, 25% RSN and 50% RSN) because of the high level of abortion of flowers and fruits. CONCLUSIONS: Caragana korshinskii responded to aboveground shoot removal through combining defence and tolerance strategies. (+info)
Mesorhizobium caraganae sp. nov., a novel rhizobial species nodulated with Caragana spp. in China.
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Conferols A and B, new anti-inflammatory 4-hydroxyisoflavones from Caragana conferta.
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Conferols A (1) and B (2), the new 4-hydroxyisoflavones, have been isolated from the dichloromethane sub-fraction of the methanolic extract of Caragana conferta along with 3',5'-dihydroxy, 7,4'-dimethoxyisoflavone (3), E-cinnamic acid (4), tetracosyl 3,4-dihydroxy-E-cinnamate (5), docosyl 3,4-dihydroxy-E-cinnamate (6), beta-sitosterol (7), beta-sitostrerol 3-O-beta-D-glucopyranoside (8), stigmasterol (9) and lupeol (10), respectively, reported for the first time from this species. The structures of the new compounds were elucidated through spectroscopic techniques including MS and 2D-NMR. The compounds 1-3 showed significant anti-inflammatory activity in the respiratory burst assay. (+info)
Mesorhizobium shangrilense sp. nov., isolated from root nodules of Caragana species.
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