Abstract
A commercial (Cartazyme) and non-commercial (Asperzyme) xylanases were studied. Cartazyme stability in a 0–70% (v/v) methanol at 50 °C and 65 °C was carried out. No deactivation was found for Cartazyme in the presence of 15% methanol at 50 °C. Half-life activity decay (t1/2) of Cartazyme at 50 °C in 30%, 50% and 70% methanol solutions were 4.0 h, 2.3 h and 1.2 h, respectively. At 65 °C, which is the ozone-alkali-peroxide (ZEP) bleaching temperature, only significant results on Kappa number reduction and selectivity were only observed in 15% methanol (t1/2 30 min) at the Z stage. For the Asperzyme, a t1/2 of 36.5 min at 50 °C was found. In the Z stage with Asperzyme in the presence of 25% of methanol, a 20% Kappa number reduction and an improvement of the ZEP sequence of the brightness of 3.1 points were obtained. These results were correlated with the xylanase stability.
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Ruiz, J., Angelo, R., Freer, J. et al. Stability of xylanases in the presence of methanol and its evaluation on the bleaching capacity. Biotechnology Letters 21, 361–366 (1999). https://doi.org/10.1023/A:1005403126642
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DOI: https://doi.org/10.1023/A:1005403126642