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1.
Three naphthoquinone pigments are described which were produced by Fusarium solani. They are 2,3-dihydro-5,8-dihydroxy-6-methoxy-2-hydroxymethyl-3-(2-hydroxypropyl)-1,4-naphthalenedione, 2,3-dihydro-5-hydroxy-4-hydroxymethyl-8-methoxy-naphtho[1,2-b]furan-6,9-dione and 5,8-dihydroxy-2-methoxy-6-hydroxymethyl-7-(2-hydroxypropyl)-1,4-naphthalenedione. One of these pigments was shown to be the precursor of the other two. 相似文献
2.
H. Haraguchi Kazumi Yokoyama Shingo Oike Masakazu Ito Hiroshi Nozaki 《Archives of microbiology》1997,167(1):6-10
The mechanism of action of antimicrobial naphthoquinones from the fungus Fusarium was studied by using Pseudomonas aeruginosa. Bostricoidin, methyl ether fusarubin, and fusarubin stimulated the oxygen consumption of bacterial cells and induced cyanide-insensitive
oxygen consumption. These activities of the tested compounds were also observed in bacterial membrane preparations in a dose-dependent
manner. Naphthoquinones stimulated the generation of superoxide anion and hydrogen peroxide. The naphthoquinone effectively
acted as the electron acceptors for bacterial diaphorase, which could explain the antibacterial activity of Fusarium naphthoquinones since electron acceptors lead to the stimulation of respiratory activity and the generation of oxygen radical
species.
Received: 12 July 1996 / Accepted: 31 October 1996 相似文献
3.
T. Hanumaiah B.K. Rao C.P. Rao G.S.R. Rao J.U.M. Rao K.V.J. Rao David S. Marshall Ronald H. Thomson 《Phytochemistry》1985,24(8):1811-1815
Two new naphthalene derivatives and three naphthoquinones have been found in the root bark of Ventilago maderaspatana. Their structures are 2-acetyl-6,7-dimethoxy-3-methyl-1,8-methylenedioxynaphthalene (ventilaginone) and 1,3-dihydro-6,9-dihydroxy-7,8-dimethoxy-1-methylnaphtho[2,3-c]furan-3-one (ventilagol), 2(2′-acetoxypropyl)-3-hydroxy-5,7,8-trimethoxy-1,4-naphthoquinone (maderone), cordeauxione and isocordeauxione. The root bark of V. calyculata contains 2-methoxystypandrone and 1-hydroxy-6-methoxy-3-methylxanthone-8-carboxylic acid (calyxanthone). 相似文献
4.
Kenichiro Inoue Shinichi Ueda Hidekazu Nayeshiro Nobuharu Moritome Hiroyuki Inouye 《Phytochemistry》1984,23(2):312-318
Administration of p13C- and p2H-labelled precursors to Streptocarpus dunnii cell cultures demonstrated that the naphthoquinones formed through aunique prenylation mode are biosynthesized via 4-(2'-carboxyphenyl)-4-oxobutanoic acid, 1,4-dihydroxy-2-naphthoic acid, lawsone and lawsone 2-prenyl ether, and that the anthraquinones are biosynthesized through prenylation of 2-carboxy-4-oxo-1-tetralone at the carboxy-bearing carbon atom to form 2-carboxy-2-prenyl-4-oxo-1-tetralone,or through ipso attack of the prenyl group on the corresponding carbon atom of 1,4-dihydroxy-2-naphthoic acid. 相似文献
5.
Investigation of the bark and/or wood of seventeen African species of Diospyros has revealed the presence of a number of triterpenes and naphthoquinones. The triterpenes lupeol, betulin and betulinic acid were detected in all samples but three other triterpenes were each found in only one species; betulinaldehyde in D. canaliculata, cerin in D. iturensis, and glutinol in D. zenkeri. Naphthoquinones were detected in fourteen of the seventeen species and the common dimeric compounds diospyrin, isodiospyrin and diosindigo-A were isolated. D. canaliculata differed from all other species in producing derivatives of plumbagin including its reduced form, isoshinanolone (1R,2R) and a novel stereoisomer which was given the trivial name epiisoshinanolone (1S,2R). 相似文献
6.
7.
M. Tezuka C. Takahashi M. Kuroyanagi M. Satake K. Yoshihira S. Natori 《Phytochemistry》1973,12(1):175-183
7-Methyljuglone (I), isodiospyrin (II), the 2,2′-binaphthyl-1,1′-quinone (III), and a new quinone (IV), hydroxyisodiospyrin, were isolated from the 相似文献
8.
Sonia Malik Shashi Bhushan Madhu Sharma Paramvir Singh Ahuja 《Critical reviews in biotechnology》2016,36(2):327-340
Shikonins are commercially important secondary compounds, known for array of biological activities such as antimicrobial, insecticidal, antitumor, antioxidants, etc. These compounds are usually colored and therefore have application in food, textiles and cosmetics. Shikonin and its derivatives, which are commercially most important of the naphthoquinone pigments, are distributed among members of the family Boraginaceae. These include different species of Lithospermum, Arnebia, Alkanna, Anchusa, Echium and Onosma. The growing demand for plant-based natural products has made this group of compounds one of the enthralling targets for their in vitro production. The aim of this review is to highlight the recent progress in production of shikonins by various biotechnological means. Different methods of increasing the levels of shikonins in plant cells such as selection of cell lines, optimization of culture conditions, elicitation, in situ product removal, genetic transformation and metabolic engineering are discussed. The experience of different researchers working worldwide on this aspect is also considered. Further, to meet market demand, the needs for continuous and reliable production systems, as well as future prospects, are included. 相似文献
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10.
Eleven naphthoquinone pigments are described which were produced by F. solani isolates obtained from roots of diseased citrus trees. One of these pigments was shown to be the precursor for six of the isolated compounds. 相似文献