1. Department of Food Science and Technology, Faculty of Agriculture, Jomo-Kenyatta University of Agriculture and Technology, P.O. Box 62000, Nairobi 00200, Kenya
2. Department of Food Science, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
3. Laboratory of Food Technology (Member of Leuven Food Science and Nutrition Research Centre), Department of Microbial and Molecular Systems (M2S), Katholieke Universiteit Leuven, Kasteelpark Arenberg 22, Box 2457, 3001 Heverlee, Belgium