1. Department of Food Technology, University of Helsinki, POB 27, FIN-00014 University of Helsinki, Finland.
2. Corresponding author. E-mail: jussi.loponen@helsinki.fi
3. Suomen Viljava Oy, Finn Cereal, Kielotie 5 B, 01300 Vantaa, Finland.
4. VTT Biotechnology POB 1500, FIN-02044 VTT, Finland.