1. Research Centre Applied Biocatalysis, Petersgasse 14, A-8010 Graz, Austria, Division of Food Biotechnology, Muthgasse 18, A-1190 Vienna, Austria, Division of Food Microbiology and Hygiene, Gregor Mendel-Strasse 33, A-1180 Vienna, Austria, Department of Food Sciences and Technology, University of Natural Resources and Applied Life Sciences, Vienna, Austria, and Lactosan Starterkulturen GmbH and Company KG, Industriestrasse West 5, A-8605 Kapfenberg, Austria