1. Ghent University, Faculty of Bioscience Engineering, Laboratory of Food Technology and Engineering, Coupure Links 653, B-9000 Gent, Belgium, Unilever Research Colworth, Sharnbrook, Bedfordshire, MK44 1LQ, U.K., and Loders Croklaan BV, Postbus 4, 1520AA Wormerveer, The Netherlands