1. School of Chemical Sciences, Universiti Sains Malaysia, Penang, Malaysia
2. Fundamental & Applied Science Dept., Universiti Teknologi Petronas, Seri Iskandar, Perak Darul Ridzuan, Malaysia
3. School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia
4. Surveillance & Research Section, Food Safety and Quality, Kedah State Health Department, Ministry of Health, Malaysia