1. School of Food Science and Engineering; South China Univ. of Technology; Guangzhou 510640 China
2. Guangdong Testing Inst. for Product Quality Supervision and China Natl. Quality Supervision and Testing Center for Foods (Guangdong); Foshan 528300 China
3. Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety; South China Univ. of Technology; Guangzhou 510640 China
4. Bio-Oils Research Unit, Natl. Center for Agricultural Utilization Research, Agricultural Research Service; U.S. Dept. of Agriculture; 1815 N. Univ. St. Peoria IL 61604 U.S.A