1. Faculty of Medicine, Department of Pharmacy, University of Malaya, Kuala Lumpur, Malaysia
2. Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
3. College of Pharmacy, Jouf University, Al-Jouf, Kingdom of Saudi Arabia
4. Nanotechnology and Catalysis Research Centre, University of Malaya, Kuala Lumpur, Malaysia