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Laccase-mediator biobleaching applied to a direct yellow dyed paper
Kristina Knutson1, Arthur Ragauskas
1Institute of Paper Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology, 500 10th St. NW, Atlanta, Georgia 30332-0620, USA.
Abstract:
A laccase-mediator system (LMS) for biobleaching was applied to a bleached chemical pulp dyed with stilbene dye Direct Yellow 11. Of mediators tested, 2,2'-azinobis(3-ethylbenzthiazoline-6-sulfonate) (ABTS) was found to be more effective than either violuric acid (VA) or N-hydroxybenzotriazole (HBT), which had been shown to be superior to ABTS when bleaching virgin chemical pulp. The laccase-ABTS system removed more than 60% of the color.
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