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Title: The temperature resistance of xylanase inhibitors affects the activity of exogenous xylanases added to pelleted wheat-based feeds
Authors: Smeets, Natasja ×
Nuyens, Filip #
Niewold, Theo #
Van Campenhout, Leen #
Issue Date: 2014
Publisher: American Association of Cereal Chemists
Series Title: Cereal Chemistry vol:91 issue:6 pages:572-577
Abstract: The addition of exogenous xylanases (EX-XYL) to wheat-based poultry feeds is a common practice today. Wheat contains xylanase inhibitors (XI) and grain-associated xylanases (GA-XYL), which could affect the action of the EX-XYL. In this study, both GA-XYL and XI activity in feeding-quality wheat were assessed. In addition, the effect of the conditions during digestion in monogastrics and the effects of pelleting at different conditioning temperatures on GA-XYL and XI were investigated. The GA-XYL activity varied between no activity and 0.821 XU/g. In contrast, the XI activity was consistently high in all wheat samples and ranged between 259 and 331 IU/g. Simulating the digestive process did not affect the activities of GA-XYL or XI. Pelleting at 85°C or higher reduced the XI activity up to 46%. GA-XYL, however, were more heat-sensitive, and their activity was reduced to 67% at 60°C. The extract viscosity increased and the release of reducing sugars decreased at higher conditioning temperatures. In addition, the net effect of EX-XYL on extract viscosity increased at higher temperatures, whereas the release of reducing sugars was not affected. In conclusion, XI affected the action of EX-XYL during the digestive process, and pelleting did not eliminate their negative effects.
ISSN: 0009-0352
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Bioengineering Technology TC, Technology Campus Geel
Division of Livestock-Nutrition-Quality (-)
Technologiecluster Bioengineering Technologie
× corresponding author
# (joint) last author

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