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Margarida A. Ferreira M.Aurea Cruz Costa A.Correia Alves M.Helena Lopes 《Phytochemistry》1973,12(2):433-435
7-MethyljugIone, 8,8′-dihydroxy-4,4′-dimethoxy-6,6′-dimethyl-2,2′-binaphthyl-1,1′-quinone, 2-methylnaphthazarin, mamegakinone and euclein have been isolated from Euclea pseudebenus. Euclein is the 3,6′-dimer of 7-methyljuglone. 相似文献
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Two naphthaquinone pigments, 5-deoxyfusarubin and anhydro-5-deoxyfusarubin, were isolated from a yellow strain of the fungus Nectria haematococca. The 13C NMR spectra of 2 biosynthetically labelled from [1-13C]acetate confirmed the structures of the pigments and established the heptaketide origin of the molecules. 相似文献
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Margarida A. Ferreira M. Helena Lopes M.Áurea Cruz Costa A. Correia Alves 《Phytochemistry》1974,13(2):499-501
8,8′-Dihydroxy-4,4′-dimethoxy-6,6′-dimethyl-2,2′-binaphthyl-1,1′-quinone, 7-methyljuglone, 8′-hydroxydiospyrin, and eucleolatin have been isolated from the root bark of E. lanceolata. Eucleolatin is the 3,6′or 3,7′- dimer of 2-methylnaphthazarin. 相似文献
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Naphthazarin esters (C1–C4) isolated from the roots of Arnebia euchroma are found as skilled dual chemosensors for Ni2+ and Cu2+ among Pb2+, Na2+, K2+, Hg2+, Mg2+, and Ca2+ metal ions. C1–C4 esters exhibited a red shift of 54 nm with Ni2+ and 30 nm with Cu2+ metal ions in absorption. There is a formation of red-shifted bands between 517 and 613 nm in the absorption spectrum of C1–C4 sensors on binding with Ni2+ and Cu2+ ions. The addition of Ni2+ and Cu2+ ions to sensors C1–C4 stimulates a remarkable color change from reddish pink to purple and light blue, respectively. These color changes can be identified with the naked eye. The significant downfield shifts of CO and OH peaks in nuclear magnetic resonance (NMR) spectrum confirm the chelation as binding mechanism. With ultraviolet–visble and NMR studies, it is found that C1–C4 esters possessed notable selectivity and sensitivity toward Ni2+ and Cu2+ over other metal ions. 相似文献
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ABDEL-FATTAH M. RIZK 《Botanical journal of the Linnean Society. Linnean Society of London》1987,94(1-2):293-326
The chemical constituents and economic plants of the Euphorbiaceae. A chemical review of the different classes of compounds which have been isolated from the Euphorbiaceae (other than the diterpenoids) is given. This includes triterpenoids and related compounds (sterols, alcohols and hydrocarbons), phenolic compounds (flavonoids, lignans, coumarins, tannins, phenanthrenes, quinones, phenolic acids, etc.), alkaloids, cyanogenic glucosides and glucosinolates. A summary of the industrial and medicinal uses of members of the Euphorbiaceae is provided. 相似文献
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W.H.M.Wimalaseela Herath Nimal D.S. Rajasekera M.Uvais S. Sultanbawa G.Percy Wannigama Sinnathamby Balasubramaniam 《Phytochemistry》1978,17(5):1007-1009
From the bark and/or timber extracts of Diospyros hirsuta, D. moonii, D. quaesita, D. spinescens, D. thwaitesii and D. walkeri, the following compounds have been isolated; lupeol, betulin, betulinic acid sitosterol, taraxerol, taraxerone, ursolic acid, oleanolic acid scopoletin, plumbagin, elliptinone, diospyrin and diosindigo A. TLC examination of the bark and timber extract of D. acuta, D. chaetocarpa, D. oblongifolia, D. oppositifolia and D. rheophytica is reported. Lupeol betulin, oleanolic acid and sitosterol have been isolated from the fruit of D. oblongfolia. 相似文献
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Akella V.B. Sankaram Vaddu V. Narayana Reddy Gurbachan S. Sidhu 《Phytochemistry》1981,20(5):1093-1096
Diosindigo A, diosindigo B and biramentacéone have been isolated from heartwood of Diospyros melanoxylon. A violet pigment isolated from the same source has been shown to be a new pentacyclic quinone. Sunlight causes diosindigo B to change to the pentacyclic quinone and biramentacéone. The intense peaks at m/e 389 and 388 in the mass spectrum of diosindigo B are doublets which arise by fragmentation of both M+ and M+ + 2. 相似文献
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James Tannock 《Phytochemistry》1973,12(8):2066-2067
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