Abiotic Transformation of Toxaphene by Superreduced Vitamin B_12 and Dicyanocobinamide

Steffen Ruppe; Anke Neumann; Gabriele DiekertWalter Vetter

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Abiotic Transformation of Toxaphene by Superreduced Vitamin B_12 and Dicyanocobinamide

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Toxaphene is a complex organochlorine pesticide mixture,residues of which are widespread in the environment.Previous studies with the isolated bacterium Sulfurospirillum(formerly Dehalospirillum)multivorans resulted in an effective anaerobic biotransformation of toxaphene.Since the bacterium contains a corrinoid derivative in the active center of the tetrachloroethene dehalogenase,we attempted to use superreduced corrinoids for abiotic transformation of toxaphene.The two corrinoids studied were dicyanocobinamide and cyanocobalamin(vitamin 612).Superreduced dicyanocobinamide mediated a rapid transformation of toxaphene.More than 90 of the initial pool was transformed within 6 h.The transformation was nonselective,and even the most persistent metabolite in environmental samples,the so-called dead-end metabolite 2-exo,3-endo,6-exo,8,9,10-hexachlorobornane(B6-923 or Hx-Sed)was transformed within hours.Superreduced cyanocobalamin was also able to transform toxaphene albeit at significantly lower velocity.The lack of transformation products detectable in gas chromatograms of hexanes-extracted fractions of the assays suggests rapid,sequential dehalogenation and/or destruction of the C_10-hydrocarbon backbone of the compounds of technical toxaphene.

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《Environmental Science & Technology: ES&T》 |2004年第11期|3063-3067|共5页
作者
Steffen Ruppe; Anke Neumann; Gabriele DiekertWalter Vetter;
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Department of Food Chemistry,Friedrich-Schiller- University of Jena,Dornburger Strasse 25,and Department of Applied and Ecological Microbiology,Friedrich-Schiller-University of Jena,Philosophenweg 12,D-07743 Jena,Germany,Department of Technical Biolo;

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正文语种英语
中图分类环境化学;
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Abiotic Transformation of Toxaphene by Superreduced Vitamin B_12 and Dicyanocobinamide

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