1. Inst. of Food and Agricultural Sciences, Food Science and Human Nutrition Dept., Food and Environmental Toxicology Laboratory; SW 23rd Drive, Univ. of Florida; P.O. Box 110720; Gainesville; FL 32611-0720; U.S.A
2. Mass Spectrometry Services, Chemistry Dept; Univ. of Florida; P.O. Box 117200; Gainesville; FL 32611-7200; U.S.A
3. Inst. of Food and Agricultural Sciences, Family Youth and Community Sciences, Food and Environmental Toxicology Laboratory, SW 23rd Drive; Univ. of Florida; P.O. Box 110720; Gainesville; FL 32611-0720; U.S.A
4. Dept. of Food Science and Technology; Mokpo Natl. Univ.; 1666 Youngsan-ro, Chungkye-myun, Muan-gun; Jeonnam; 534-729; Republic of Korea
5. Dept. of Food Science and Nutrition; Dankook Univ.; 152 Jukjeon-Ro, Suji-Gu, Yongin-Si; Gyeonggi-Do; 448-701; Republic of Korea