Notice of RetractionEnzymatic Conversion of 2,4-Dichlophenol by Laccase

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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Laccase from Coriolus versicolor was used to study the conversion of 2,4-Dichlorophenol (DCP). DCP can be transformed nearly half after treating by 0.1ΔA/mL for 2h, and the conversion ratio DCP reached above 80% after treating for 5h when the initial DCP was 80mg/L, pH 6.5, temperature 35°C High DCP concentration will inhibit the conversion. The existents of ethanol, dioxane and acetone decreased the DCP conversion. But conversion ratio was still above 50% after 4h and above 65% after 7h, which implied that when the substrates were poorly soluble in water, the organic solvents can be chosen to increase their solubility and make their enzymatic conversion possible. UV, FTIR and HPLC spectra were used to analyze the conversion production, and results showed that DCP was degraded by multistep pathway involving the formation of quinonic structure and/or tetrahydroxybenzene, catechol and/or chlorocatechol, the cleavage of aromatic ring and so on.