Enzymatic Coupling of the Herbicide Bentazon with Humus Monomers and Characterization of Reaction Products
| Autor: | Jean-Marc Bollag, Jang-Eok Kim, Errol Fernandes |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Environmental Science & Technology. 31:2392-2398 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/es961016l |
| Popis: | To elucidate the binding mechanism of the herbicide bentazon (3-isopropyl-1H-2,1,3-benzothiadiazine-4(3H)-one 2,2-dioxide) with humic monomers in the presence of an oxidative enzyme, the reaction of bentazon with catechol, caffeic acid, protocatechuic acid, and syringaldehyde was investigated. In the presence of a laccase from the fungus Polyporus pinsitus, catechol was the most reactive humic monomer; bentazon with catechol in the presence of the laccase was completely transformed in 30 min at pH 4.0. The reactivity of bentazon decreased with increasing pH, but reactivity of bentazon decreased with increasing pH, but complete transformation of bentazon could be achieved even at high pH if the concentration of catechol was increased. When bentazon was incubated with humic acid (extract of leonardite) in the presence of the laccase, a reaction of the two substrates was observed, as indicated by bentazon disappearance. Two metabolites that result from the reaction of bentazon with catechol were isolated by ... |
| Databáze: | OpenAIRE |
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