1. Laboratory of Natural Products, Institute of Bioscience; Universiti Putra Malaysia; 43400 Serdang Selangor Malaysia
2. Department of Food Science, Faculty of Food Science and Technology; Universiti Putra Malaysia; 43400 Serdang Selangor Malaysia
3. Department of Chemistry, Faculty of Science; Universiti Putra Malaysia; 43400 Serdang Selangor Malaysia