Results 201 to 210 of about 8,591 (228)
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Biosynthesis of ochratoxins by Aspergillus ochraceus
Phytochemistry, 2001Shaken liquid fermentation of an isolate of Aspergillus ochraceus showed growth-associated production of ochratoxins A and B, followed by production of a related polyketide diaporthin. Later, between 150 and 250 h, mellein accumulated transitorily.
Jonathan P Harris, Peter G. Mantle
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Transformation of xanthohumol by Aspergillus ochraceus
Journal of Basic Microbiology, 2013Microbial transformation of xanthohumol isolated from agro‐residue (spent hops), by Aspergillus ochraceus was investigated. A new aurone, (Z)‐2″‐(‐hydroxyisopropyl)‐dihydrofurano[4″,5″:6,7]‐3′,4′‐dihydroxy‐4‐methoxyaurone, was obtained as a main transformation product. Three minor metabolites were identified as 2″‐(‐hydroxyisopropyl)‐dihydrofurano[4″,5″
Jarosław Popłoński +3 more
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Biotransformation of Digitoxin by Aspergillus Ochraceus
Advanced Materials Research, 2011Biotransformations of natural products have great potential for preparation of lead compounds. In this paper, the biotransformation of digitoxin (1) with Aspergillus ochraceus afforded two products, identified as digitoxigenin (2) and sarmentogenin (3) by HR-MS, 1H-NMR and 13C-NMR.
Xi Chen +4 more
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Biosynthesis of diaporthin and orthosporin by Aspergillus ochraceus
Phytochemistry, 2001Diaporthin and orthosporin were characterised from the fungus Aspergillus ochraceus D2306. Diaporthin was identified by high-resolution electron impact mass spectrometry and 1H and 13C NMR spectroscopy, from which new spectroscopic assignments were made.
Peter G. Mantle, Jonathan P Harris
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The biosynthesis of the ochratoxins, metabolites of aspergillus ochraceus
Phytochemistry, 1970Abstract The biosynthesis of ochratoxin A (Ia) was studied in Aspergillus ochraceus Wilh. by experiments in which dl -phenylalanine [U- 14 C], sodium acetate [1- 14 C] and methionine [ 14 CH 3 ] were supplied to a resting culture of the fungus. The carboxyl carbon of the amide group is shown to be derived from the C 1 -pool.
Cedric W. Holzapfel +2 more
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Allergic Bronchopulmonary Aspergillosis Caused by Aspergillus ochraceus
American Journal of Clinical Pathology, 1978A case with the characteristics of allergic bronchopulmonary aspergillosis is described. The species of Aspergillus involved, A. ochraceus, has not previously been found in this disorder. The organism had antigenic properties distinct from five other species of Aspergillus most commonly associated with allergic bronchopulmonary aspergillosis.
Ian D. Wells, Harold S. Novey
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New Diketopiperazine Metabolites from the Sclerotia of Aspergillus ochraceus
Journal of Natural Products, 1992Three new diketopiperazine-containing metabolites 1-3 have been isolated from the sclerotia of Aspergillus ochraceus (NRRL 3519) by chromatography on Sephadex LH-20 and reversed-phase hplc. The structures of these compounds were established using extensive high-field 1D and 2D nmr experiments. All three compounds cause moderate reduction in weight gain
Donald T. Wicklow +3 more
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Continuous hydroxylation of progesterone byAspergillus ochraceus
Antonie van Leeuwenhoek, 1961In this paper are presented the results of experiments undertaken to determine what conditions are necessary for the hydroxylation of progesterone during continuous culture ofAspergillus ochraceus NRRL 405. It was found possible to operate with either one or two stages, but because of the inhibitory effect of progesterone on the growth of the ...
George J. Fuld, Richard I. Mateles
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Toxicon, 2021
Grains are susceptible to contamination by molds; some cause spoilage and others produce certain mycotoxins that cause a serious health threat to humans and animals. Aspergillus flavus and Aspergillus ochraceus and their mycotoxins, aflatoxins and ochratoxin A, are natural contaminants of various agricultural commodities.
Ola A.A. Khalil +2 more
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Grains are susceptible to contamination by molds; some cause spoilage and others produce certain mycotoxins that cause a serious health threat to humans and animals. Aspergillus flavus and Aspergillus ochraceus and their mycotoxins, aflatoxins and ochratoxin A, are natural contaminants of various agricultural commodities.
Ola A.A. Khalil +2 more
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Isolation of secondary metabolites of Aspergillus ochraceus by HPLC
Mycotoxin Research, 1986A method is described for the isolation and purification of ochratoxin A, ochratoxin B, ochratoxin ß mellein, 4-hydroxymellein and penicillic acid produced byAspergillus ochraceus in a synthetic liquid medium. Ochratoxin α, which was not found in the culture medium, was obtained by acid hydrolysis of ochratoxin A.
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