title: Polymerization of bisphenol A by purified laccase from Trametes villosa.
abstract: The metabolism of bisphenol A (BPA), an endocrine-disrupting chemical, was studied with a highly purified laccase from the basidiomycete Trametes villosa. The enzyme reaction products ranged widely from water-insoluble to -soluble compounds, one of which was previously identified as 4-isopropenylphenol. (1)H NMR and electron-impact mass spectrum analyses showed that one of the insoluble products was a BPA dimer, 5,5'-bis-[1-(4-hydroxy-phenyl)-1-methyl-ethyl]-biphenyl-2,2'-diol. Field-desorption mass spectrum analysis revealed BPA oligomers, some of which contained phenol, within the insoluble fraction. These results indicate that the laccase reaction may contain successive BPA polymerization, followed by either the addition of phenol to the formed oligomers or their decomposition to release 4-isopropenylphenol.
authors.affiliation: Applied Chemistry and Biotechnology, Faculty of Engineering, Fukui University, 9-1, Bunkyou 3-Chome, Fukui-shi 910-8507, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Uchida
authors.forename: T
authors.initials: T
authors.lastname: Fukuda
authors.forename: H
authors.initials: H
authors.lastname: Miyamoto
authors.forename: T
authors.initials: T
authors.lastname: Kawabata
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Uwajima
mesh_terms: D001559:Benzhydryl Compounds; D002850:Chromatography, Gel; D042845:Laccase; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008970:Molecular Weight; D010088:Oxidoreductases / Q000302:isolation & purification / Q000378:metabolism*; D010636:Phenols / Q000737:chemistry / Q000378:metabolism*; D011108:Polymers / Q000737:chemistry; D020072:Polyporales / Q000201:enzymology*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D042845:Laccase; D010088:Oxidoreductases; D010636:Phenols; D011108:Polymers; C006780:bisphenol A; D000098826:Bisphenol A Compounds