1. VTT Technical Research Centre of Finland Ltd, P.O. Box 1000; FI-02044 VTT Finland
2. University of Helsinki, Department of Food and Environmental Sciences, Food Technology, P.O. Box 66; FI-00014 Helsingin Yliopisto Finland
3. Istituto di Metodologie Chimiche, Area della Ricerca CNR Roma; CP 10, 00016 Monterotondo S. Italy
4. VTT Technical Research Centre of Finland Ltd, Sinitaival 6; FI-33101 Tampere Finland