Laccase-catalyzed bisphenol A oxidation in the presence of 10-propyl sulfonic acid phenoxazine


Rūta Ivanec-Goranina , Juozas Kulys , Irina Bachmatova , Liucija Marcinkevičienė , Rolandas Meškys

DOI:10.1016/j.jes.2014.07.026

Received April 28, 2014,Revised July 21, 2014, Accepted , Available online April 23, 2015

Volume 27,2015,Pages 135-139

The kinetics of the Coriolopsis byrsina laccase-catalyzed bisphenol A (BisA) oxidation was investigated in the absence and presence of electron-transfer mediator 3-phenoxazin-10-ylpropane- 1-sulfonic acid (PPSA) at pH 5.5 and 25℃. It was shown that oxidation rate of the hardly degrading compound BisA increased in the presence of the highly reactive substrate PPSA. The increase of reaction rate depends on PPSA and BisA concentrations as well on their ratio, e.g., at 0.2 mmol/L of BisA and 2 μmol/L of PPSA the rate increased 2 times. The kinetic data were analyzed using a scheme of synergistic laccase-catalyzed BisA oxidation. The calculated constant, characterizing reactivity of PPSA with laccase, is almost 1000 times higher than the constant, characterizing reactivity of BisA with laccase. Thismeans that mediator-assisted BisA oxidation rate can be 1000 times higher in comparison to non-mediator reaction if compounds concentration is equal but very low.

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