1. Laboratory of Chemistry, Faculty of Islamic Education and Teaching Sciences, Universitas Islam Negeri Profesor Kiai Haji Saifuddin Zuhri, Jalan A. Yani 40 A, Purwokerto, Indonesia
2. Agro Economic Research Group, Department of Economic and Development Studies, Faculty of Economics and Business, Universitas Jenderal Soedirman, Jalan HR. Bunyamin 708, Purwokerto, Indonesia