BIOTRANSFORMATION DES TOXIQUES PDF

Ayoub BENSAKHRIA · @ayoubbensakhria. Toxicologist. analyticaltoxicology. com. Joined September Metal and metalloid biotransformations in South African acid mine drainage systems” .. la présence de composés très toxiques comme le plomb, l’arsenic ou le. d’effets toxiques précoces et tardifs pour des molécules En effet, les poissons étant capables de biotransformation, ils peuvent donc.

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A subsequent compar- biotransformatino of its substantially revamped structure in compari- ative biotransforamtion NMR analysis Table 4 of M-2 indicated it to be a son with thaxtomin A and is a prime example of the poten- C conformer Fig. Revision received 20 November When assayed on aseptically bitransformation mini-tubers, the major metabolites proved to be much less phytotoxic than thaxtomin A.

The relative proportions of these metabolites did not enced the rate of thaxtomin A transformation. Synthetic studies related to the structural determinations confirmed that the presence of a C-4 nitro and a C phenyl moiety are requi- sites for phytotoxicity in these compounds King et al. The txtAB biotransformatiin of the plant pathogen Streptomyces destruxins: The ef- matographic and molecular weight data for the metabolites. Plant pathogenicity in the genus Streptomyces.

The best example of this approach for L. Log In Sign Up. Scab lesions fection by the soil bacterium Streptomyces scabies, is con- may be superficial, erumpent, or pitted and thereby cause di- sidered a disease of major economic importance in many rect losses to growers by reducing tuber marketability.

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A comparison of bioteansformation respective 1H Acknowledgements NMR spectra Table 5 demonstrated essential differences only in the C substituents, i. In the process of repurifying the M-3 sample after 1H to the eventual dehydration products M-3 and M In some experiments, Nishino and Spain Values in parentheses are the standard error. The phytotoxins associated with common scab of potato disease consist of 4-nitroindol-3yl containing dioxo- piperazines, and thaxtomin A Fig.

Both methods utilized retained the 4-nitroindole moiety. By day 3, however, such cultures had significant the fungus completely eliminate thaxtomin A from the cul- amounts of M Skip to main content. For assessment of fungal acteristic yellow colour of thaxtomin A in the medium or by growth, triplicate 5-mL samples were filtered through a thin-layer chromatography TLC studies of medium ex- preweighed Whatman No.

The transformation of 0. Biotransformation of the Streptomyces scabies phytotoxin thaxtomin A by the biotfansformation Aspergillus niger.

Patent Office 30 pages. The pH of the me- analog of thaxtomin A see Table 1.

In Manual of environmen- Streptomyces scabies mutants altered in thaxtomin A produc- tal microbiology. The maximum Metabolite identification fungal dry weight of 18—21 mg was obtained by day 3 biotransformatkon In biotransfofmation of the thaxtomin A transformation both the presence and absence of thaxtomin A Table 2.

Five- bioactivity King et al. In initial endeavours to biotransformatioj millilitre volumes of the nutrient media were pipetted into tain if biological detoxification of thaxtomin A was possible, sterile mL Erlenmeyer flasks for testing thaxtomin A various bacteria of unknown classification were screened for transformations. Similarly, extracts from full- and half-strength 1. The me- isolates collected from rotting wood. King, and Larry A. Quantitative relationships among thaxtomin A production, potato scab severity, and fatty acid composition in Streptomyces.

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Occasionally, however, even some of the higher dos- al. Detoxification of fusaric acid by a fusaric acid-resistant Streptomyces scabies.

Toxic biotransformations – definition of toxic biotransformations by The Free Dictionary

biotransofrmation In these preliminary studies performed using mini- from 1 to 14 days after inoculation. Only in a few instances did lation.

Controls received absolute ethanol only. Mean of three replications of two separate experiments. The tent in their activity.

biotransformation

Under optimum conditions the fungus converted thaxtomin A into two major and five minor metabolites. Biodegradation and transfor- Goyer, C. Of the four remaining me- tial for biocontrol stratagems based on phytotoxin tabolites, only two, i. The gene for albicidin detoxifica- of phytotoxins associated with Streptomyces scabies, the causal tion from Pantoea dispersa encodes an esterase and attenuates organism of biotransformatioon common scab.