1. Laboratory of Enzyme, Fermentation and Brewing Technology, KaHo St.-Lieven, Gebroeders Desmetstraat 1, B-9000 Gent, Belgium, Leuven Food Science and Nutrition Research Centre (LFoRCe), Department M2S, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, B-3001 Leuven, Belgium, and Wroclaw University of Technology, Institute of Organic Chemistry, Biochemistry and Biotechnology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland