1. College of Light Industry; Textile & Food Engineering and Key Laboratory of Leather Chemistry and Engineering; Ministry of Education; Sichuan Univ; Chengdu 610065 China
2. Dept. of Food Science and Technology; Oregon State Univ; Corvallis, 97331 OR U.S.A
3. Natl. Engineering Research Center of Solid-State Brewing; Luzhou 646000 China