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KMID : 0380019950100020183
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Korean Journal of Biotechnology and Bioengineering
1995 Volume.10 No. 2 p.183 ~ p.189
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The Effects of Phenolic Radical Carriers on the Enzymatic Bleaching of Kraft Pulp
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Ryu Keun-Garp
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Abstract
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The effects of enzymatic pretreatments on the bleaching of kraft pulp were studied. The kappa numbe- of pulp samples which represents the lignin content of pulp decreased by 25.2% by the pretreatments with xylanase(EC 3.2.1.8, Pulpzyme HB) while it decreased by 13.7% without enzyme pretreatments after the extraction of the pretreated pulp samples in 1N NaOH. To enhance the effects of enzymatic pretreatment on the bleaching of kraft pulp, phenols were used as radical carriers with the simultaneous use of peroxidase(EC 1.11.1.7, Novozyme 502), H20;xylanase. Guaiacol (1mM) was most effective by decreasing the kappa number by 29.6% when a low initial concentration of H202 (0.1mM) was used. The use of either a higher initial concentration of H202 or phenols lacking electron donating substituents such as phenol and p-chlorophenol, howeve;decreased the efficiency of enzymatic pretreatment indicating that the production rate and the stability of phenolic radicals are important parameters.
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