1. Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
2. University of Malaya Centre for Ionic Liquids, Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
3. Department of Toxicology, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Kepala Batas, Penang, Malaysia