A non-cellulase producing strain of Bacillus subtilis and its potential use in pulp biobleaching

A newly isolated strain of Bacillus subtilis produced beta-mannanase when c ultivated in a medium containing either locust bean gum, konjac mannan or g uar gum as a sole carbon source. In contrast, xylanase was produced only wh en oat spelt xylan or wheat bran was used as a carbon source. The culture s upernatant, which contained both beta-mannanase and xylanase, was used to b iobleach crude paper pulp to 50% gain in brightness.