1. Dept. of Food Science; Natl. Pingtung Univ. of Science and Technology; Pingtung 91201 Taiwan
2. Dept. of Microbiology, Immunology, and Biophamarceuticals, Natl. Chiayi Univ.; Nr. 300 Syuefu Rd. Chiayi City 60004 Taiwan
3. Life Science Center, Hsing Wu Univ; Taipei 244 Taiwan