1. Faculty of Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900Kampar, Perak, Malaysia
2. Centre for Applied Sciences, Faculty of Applied Sciences, Universiti Teknologi MARA, Samarahan Campus 2, Jalan Meranek, 94300Kota Samarahan, Sarawak, Malaysia
3. Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia