Breeding of Xylanase-Producing Strains by Ion Implantation and Studying of Fermentation Conditions
With ion implantation, a high xylanase-producing strain Aspergillus niger BU99 was selected. Different late acting carbon sources (wheat bran, wheat straw, corncob and bagasse) had an effect on enzymatic production. Additionally, it was found that fast acting carbon sources (lactose, galactose, sucrose, glucose and maltose) put into the media affected on xylanase production too. Severe catabolic repression was observed in the media with lactose, but other sugars (galactose, sucrose, glucose and maltose) could increase the production of xylanase compared with the control. The production of xylanase was improved too when corncob flour was hydrolyzed by α-amylase, cellulase or/and glucoamylase. Additionally, it was found that the production of xylanase would be almost higher at 60h when the media contained glucose or were hydrolyzed by enzymes.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
S. C. Li et al., "Breeding of Xylanase-Producing Strains by Ion Implantation and Studying of Fermentation Conditions", Advanced Materials Research, Vols. 233-235, pp. 1442-1446, 2011