1. Institute of Tropical Forestry and Forest Product, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
2. Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang Selangor, Malaysia
3. Institute of Advanced Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia