1. Biofuel Research Group, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Sriwijaya, Indralaya 30662, Indonesia
2. Department of Chemistry, Magister Program, Faculty of Mathematics and Natural Science, Universitas Sriwijaya, Indralaya 30662, Indonesia
3. Department of Chemical Engineering, Department of Engineering, Universitas Sriwijaya, Indralaya 30662, Indonesia
4. Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia