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2014 Vol.46, Issue 1
Bleaching of Kraft Pulp with Xylanase and Laccase-Mediator System
Chulhyun Yoon
,
Hyunchae Jung†
Dept. of Forest Resources, Sunchon National University, 255 Jungangno, Suncheon, Jeonnam 540-742, Korea
†jhc@sunchon.ac.kr
28 February 2014. pp. 1-10
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Abstract

Xylanase (X) derived from Aurreobasidium pullulans and laccase-mediator system (LM) using Trichophyton sp. LKY-7 laccase (TrL) and N-hydroxy-2-pyridone analogue (NHP) as a mediator were applied in hardwood kraft pulp (HwKP) bleaching. The individual and the synergistic effects of X and LM stage were investigated in the enzymatic bleaching of HwKP. Also, the effects of subsequent alkaline extraction (E) and alkaline/hydrogen peroxide treatment (P) were examined. In X or LM treatment alone, an appreciable bleaching effect of HwKP was not observed, whereas subsequent E or P stage enhanced the increase of brightness and the decrease of kappa number. Especially, P stage significantly enhanced the bleaching effect of pulp. Bleaching of HwKP with XLM sequentially gave significantly higher pulp brightness and lower kappa number than that obtained after the treatment of HwKP with X+LM simultaneously. When HwKP was sequentially treated with XLM followed by P stage, the brightness increased by about 11% ISO and the kappa number decreased by about 3.6 in comparison with the initial pulp. Xylanase and laccase were strongly inactivated by NHP both in the absence and the presence of pulp.

Keywords
hardwood kraft pulp
xylanase
laccase-mediator system
alkaline extraction
alkaline/peroxide treatment
inactivation of xylanase and laccase
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Information
  • Publisher :Korea Technical Association of The Pulp and Paper Industry
  • Publisher(Ko) :한국펄프종이공학회
  • Journal Title :Journal of Korea TAPPI
  • Journal Title(Ko) :펄프종이기술
  • Volume : 46
  • No :1
  • Pages :1-10
  • Received Date : 2013-11-05
  • Revised Date : 2014-02-11
  • Accepted Date : 2014-02-14
  • DOI :https://doi.org/10.7584/ktappi.2014.46.1.001
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