1. Dept. of Food Science and Technology; Faculty of Agriculture; Jomo-Kenyatta Univ. of Agriculture and Technology; P.O. Box 62000 Nairobi 00200 Kenya
2. Dept. of Food Science; Univ. of Otago; P.O. Box 56 Dunedin 9054 New Zealand
3. Dept. of Food Science and Technology; Machakos Univ. College, P.O. BOX 136-90100 Machakos Kenya
4. The Co-operative Univ. College of Kenya; P.O. Box 24814-502 Karen Nairobi Kenya
5. Laboratory of Food Technology, Leuven Food Science and Nutrition Research Centre, Dept. of Microbial and Molecular Systems (M S); Katholieke Univ. Leuven; Kasteelpark Arenberg 22 box 2457 3001 Heverlee Belgium