1. College of Food Science and Engineering, Ocean University of China, No. 5 Yu Shan Road, Qingdao, Shandong Province 266003, P.R. China
2. Technical Center of Inspection and Quarantine, Shandong Entry-Exit Inspection and Quarantine Bureau, No. 70 Qutangxia Road, Qingdao, Shandong Province 266002, P.R. China