1. Department of Physics and Nanotechnology, Aalborg University, 9220 Aalborg, Denmark.
2. DSM Nutritional Products, Animal Nutrition & Health, 4002 Basel, Switzerland.
3. Department of Feed Applications, Novozymes A/S, 2880 Bagsværd, Denmark.
4. Corresponding author. Department of Feed Applications, Novozymes A/S, 314 Feed Applications, Building 8G1.01, 2880 Bagsværd, Denmark. Phone: +45 44460618. E-mail: nrp@novozymes.com