1. Dept. of Chemical Engineering; Curtin University; Sarawak 98009 Malaysia
2. Curtin Sarawak Research Institute, Curtin University; Sarawak 98009 Malaysia
3. Faculty of Health Sciences; Curtin University; Perth 6102 Australia
4. Biotechnology Research Institute, Universiti Malaysia Sabah; Kota Kinabalu Sabah 88400 Malaysia