1. College of Food Science & Nutritional Engineering, Natl. Engineering Research Centre for Fruits and Vegetables Processing, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education; China Agricultural Univ; Beijing 100083 China
2. Dept. of Nutrition and Food Science; Univ. of Maryland; College Park MD 20742-7640 U.S.A