1. Department of Biotechnology, Universiti Pertanian Malaysia, 43400 Serdang, Selangor, Malaysia
2. Department of Food Technology, Universiti Pertanian Malaysia, 43400 Serdang, Selangor, Malaysia
3. Department of Botany, Faculty of Life Sciences, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
4. Department of Chemistry, Universiti Pertanian Malaysia, 43400 Serdang, Selangor, Malaysia
5. Faculty of Agriculture, Okayama University, Okayama 700, Japan