1. Department of Bioenvironmental Systems Engineering; National Taiwan University; No. 1 Roosevelt Road, Sec. 4 Taipei 106 Taiwan
2. Forest Chemistry Division; Taiwan Forestry Research Institute; 53 Nanhai Rd. Taipei 100 Taiwan
3. Department of Food Science; School of Environmental and Biological Sciences, Rutgers; the State University of New Jersey; 65 Dudley Rd. New Brunswick NJ 08901-8520 USA