کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
685018 889032 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Biobleaching of wheat straw-rich soda pulp with alkalophilic laccase from γ-proteobacterium JB: Optimization of process parameters using response surface methodology
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Biobleaching of wheat straw-rich soda pulp with alkalophilic laccase from γ-proteobacterium JB: Optimization of process parameters using response surface methodology
چکیده انگلیسی

An alkalophilic laccase from γ-proteobacterium JB was applied to wheat straw-rich soda pulp to check its bleaching potential by using response surface methodology based on central composite design. The design was employed by selecting laccase units, ABTS (2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid)) concentration and pH as model factors. The results of second order factorial design experiments showed that all three independent variables had significant effect on brightness and kappa number of laccase-treated pulp. Optimum conditions for biobleaching of pulp with laccase preparation (specific activity, 65 nkat mg−1 protein) were 20 nkat g−1 of pulp, 2 mM ABTS and pH 8.0 which enhanced brightness by 5.89% and reduced kappa number by 21.1% within 4 h of incubation at 55 °C, without further alkaline extraction of pulp. Tear index (8%) and burst index (18%) also improved for laccase-treated pulp as compared to control raw pulp. Treatment of chemically (CEH1H2) bleached pulp with laccase showed significant effect on release of chromophores, hydrophobic and reducing compounds. Laccase-prebleaching of raw pulp reduced the use of hypochlorite by 10% to achieve brightness of resultant hand sheets similar to the fully chemically bleached pulp.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 99, Issue 16, November 2008, Pages 7472–7479
نویسندگان
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