1. Key Laboratory of Food Processing Technology and Quality Control of Shandong Higher Education Institutes; the College of Food Science and Engineering, Shandong Agricultural Univ.; Taian Shandong 271018 P. R. China
2. School of Chemical Sciences; The Univ. of Auckland; Private Bag Auckland 92019 New Zealand
3. Shandong Inst. of Pomology; Taian Shandong 271000 P. R. China
4. Central Laboratory of Shandong Academy of Agricultural Sciences; Key Laboratory of Test Technology on Food Quality and Safety of Shandong Province; Jinan Shandong 250100 P. R. China