Get Bioactive Natural Products (Part G), Volume 26 PDF

By Atta-Ur-Rahman

ISBN-10: 0444510044

ISBN-13: 9780444510044

Quantity 26 of "Studies in typical Product Chemistry" offers the chemistry of a big variety of interesting usual items. all the chapters replicate the significance of the organic job of nature's molecules - job which keeps to motivate the evolution of recent medications opposed to ailment. issues lined contain: the triterpenoid saponins from the Caryophyllaceae relatives; advancements within the overall synthesis of bioactive marine fatty acids; and the chemistry and organic task of secologanin, lignans, saffron and the bark of Fraxunus ornus. quite a number traditional compounds that are utilised within the evaluate of environmental matters also are mentioned, as are the pharmacological actions and functions of crucial oils, plant progress regulators and phytotoxins. The chemistry and bioactivity of secondary metabolites is reviewed during this quantity, including the constitution, chemistry and organic job of resveratrol oligomers. contemporary advancements within the chemical behaviour, toxicology and chemical ecology of compounds present in bracken fern are reviewed. The prevalence, constitution and bioactivity of 1,7-diarylheptanoids is roofed, including the constructions and organic actions of usual pesticides. power anti-parasitic substance from ordinary resources is gifted right here, as is the chemistry and bioactivity of nitric oxide (NO) in plant and animal cells. The position of O-aminophenol-type tryptophan metabolites in dwelling organisms is usually mentioned.

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Additional info for Bioactive Natural Products (Part G), Volume 26

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OH 41 In 1995, Liu et al. reported the isolation of three new saponins from the roots of G. oldhamiana [78], which has been used as a substitute for the wellknown traditional Chinese medicinal herb Sterllaria dichotoma var. lanceolata in the treatment of fever, consumptive disease, and infantile malnutrition. The most polar saponin was a bisdesmoside and its structure was established as shown in Fig. (26). The other two saponins were monodesmosides derived from C-28 methyl esters of quillaic acid and gypsogenin and having identical sugar moieties at C-3.

Some of these compounds exhibited significant analgesic activity. The structures of dianosides A-I, were established by ^H and ^C NMR as well as some chemical transformations. Three more gypsogenic acid based saponins, viz. the 3-0-glucopyranoside, 3,28-0-digluco- pyranoside (dianoside A), and 3-0-glucopyranosyl 28-0-[glucopyranosyl (l-^6)glucopyranoside] (azukisaponin) were identified from D. caryophyllus var remontent (carnation) [66]. Recently, we reported the isolation and structure elucidation of eight triterpenoid saponins, dianchinenosides A-H, from the aerial parts of D, chinensis, documented in traditional Chinese medicine (Fig.

54), indicated that the aglycone had an olean-12-ene skeleton. After an extensive 2D-NMR analysis, the aglycone was identified as quillaic acid [43, 44]. 9) compared to those of the aglycone indicated that it was a bisdesmoside. 9), Fig. (8). Alkaline hydrolysis furnished a prosapogenin, identified as quillaic acid 3-0-P-D-galactopyranosyI-(l->2)[P-D-xylopyranosyl(l->3)]-P-D-glucurono-pyranoside from its spectral data. Acid hydrolysis afforded quillaic acid, and the monosaccharide components were identified as fucose, galactose, xylose, quinovose and rhamnose in the ratio 1:1:4:1:1 from GLC analysis of their TMS derivatives.

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