1. College of Food Science and Engineering; Ocean Univ. of China; Qingdao 266003 China
2. Dept. of Chemical and Materials Engineering; Univ. of Auckland; Auckland 1142 New Zealand
3. Fonterra Research Centre; Fonterra Co-operative Group Limited; Palmerston North 4442 New Zealand
4. Dept. of Chemical Engineering; Univ. of Bath; Claverton Down Bath BA2 7AY United Kingdom