1. Faculty of Science, Department of Chemistry, Universiti Putra Malaysia, Serdang, Malaysia
2. Faculty of Applied Science, Universiti Teknologi MARA, Jengka, Malaysia
3. School of Biosciences, Taylor’s University, Subang Jaya, Malaysia
4. Faculty of Science, Department of Chemical Sciences, Universiti Tunku Abdul Rahman, Kampar, Malaysia
5. Centre of Applied Science Studies, Universiti Teknologi MARA, Kuching, Malaysia
6. Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia