کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
682085 | 888975 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Biobleaching of eucalypt kraft pulp with a two laccase-mediator stages sequence Biobleaching of eucalypt kraft pulp with a two laccase-mediator stages sequence](/preview/png/682085.png)
A new biobleaching sequence, with two enzymatic stages based on the application of laccase-mediator systems, was tested (L1EL2QPo) in order to increase the effectiveness of enzyme delignification on eucalypt kraft pulp. Different synthetic – 1-hydroxybenzotriazole (HBT) and violuric acid (VA) – and natural – syringaldehyde (SyAl) – mediators were used in the laccase stages and the biobleached pulp were compared in terms of chemical, optical and physico-mechanical properties. The pulp bleached with HBT or VA showed similar delignification (64.1% and 65.9% respectively) and optical properties (86.4% and 86.1% ISO brightness respectively) than an industrial TCF pulp (68.3% delignification and 84.8% ISO brightness). SyAl improved these properties in a lower extent (56.71% delignification and 80.52% ISO brightness). Regarding physico-mechanical properties of pulp, the biobleaching sequence had no a negative effect, even some slight improvements were observed in very specific cases.
Journal: Bioresource Technology - Volume 101, Issue 18, September 2010, Pages 6924–6929