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In this paper the arabinoxylanase activities and the content of water-extractable arabinoxylans (WEAXs) including their degradation products in wheat Yannong 24 during the malting process were studied. The results showed that the endo-β-1,4-xylanase activity had a large increase during the steeping process, endo-β-1,4-xylanase and α-L-arabinofuranosidase achieved the highest activity on day 4 of germination. During malt kilning, endo-β-1,4-xylanase and α-L- arabinofuranosidase were not heat stable, and the activity decline rate were 65.88% and 69.58%; whereas malt β-D-xylosidase was resistant to heat and it’s activity decline rate was only 18.74%. It is during steeping and the first day of germination that the content of WEAXs and it’s degradation products (WEAXs+DP) dramatically increased, and this corresponded to the greater improvement of endo-β-1,4-xylanase activity in the same phase. The WEAXs+DP content has a very significant positive correlation with the endo-β-1,4-xylanase activity (0.892, p&lt;0.01). It can be indicated that endo-β-1,4-xylanase is the main degrading enzyme in the degradation of WUAXs and the increase of the WEAXs content during steeping and the first day of wheat germination.

Characterization of arabinoxylan degrading enzymes during wheat malting