1. Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih Km. 32, Indralaya, Palembang, Sumatra Selatan 30662, Indonesia
2. Biofuel Research Group, Faculty of Mathematics and Natural Science, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih Km. 32, Indralaya, Palembang, Sumatra Selatan 30662, Indonesia
3. Department of Chemical Engineering, Faculty of Engineering, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih Km. 32, Indralaya, Palembang, Sumatra Selatan 30662, Indonesia