Abstract
Ultrafiltration of culture solutions of the fungus Aureobasidium pullulans gave rise to low and high molecular weight enzyme fractions. The low molecular weight enzyme was found to have activities toward birchwood xylan, mannan and carboxymethylcellulose, while the high molecular weight fraction exerted only endoxylanase activity. Enzyme treatment of kraft pulps for 90 minutes resulted in a considerable release of lignin-carbohydrate complex (LCC), particularly when the low molecular weight fraction was used. This treatment enhanced removal of residual lignin from the pulps during the treatment and in subsequent bleaching stages.
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