1. State Key Laboratory of Biochemical Engineering, Inst. of Process Engineering; Chinese Acad. of Sciences; Beijing 100190 China
2. Dept. of Food Science and Technology; Univ. of Nebraska-Lincoln; Lincoln N.E. 68588 U.S.A
3. Univ. of Chinese Acad. of Sciences; Beijing 100049 China
4. Dept. of Chemical and Biomolecular Engineering; Univ. of Nebraska-Lincoln; Lincoln N.E. 68588 U.S.A