1. Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar, Perak 32610, Malaysia
2. International Institute for Halal Research and Training (INHART), International Islamic University, Kuala, Lampur 53100, Malaysia
3. Centre of Research in Ionic Liquids, Universitit Teknologi PETRONAS, Seri Iskandar, Perak 32610, Malaysia
4. Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744, Moto-oka, Fukuoka 819-0395, Japan