Abstract
The production of laccase from Trametes sp. I-62 was optimized, and then it was applied for the first time in biobleaching in order to contribute to solve some problems associated with pulp bleaching. When wheat straw and copper sulfate were used in combination as inductors, the maximum laccase activity was obtained. The resulting enzymatic fluid was applied at optimum pH and temperature jointly with acetosyringone in a pretreatment stage (L) aimed to enhance the subsequent bleaching consisting of an alkaline extraction (E) and a hydrogen peroxide stage (P). Results showed that, even when a significantly lower amount of hydrogen peroxide was consumed in the LEP sequence (41.9% vs 89.9% for EP), higher delignification (40.6% vs 33.4%) and brightness (63.6 vs 56.3% ISO) were achieved. After accelerated aging, the optical properties of the biobleached pulp were found to be less stable but still remained higher than those of control pulps.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
