Hamid, A., Badrus Syafa’, M. ., Esti Purbaningtias, T. ., Rahmawati, Z., Fatah, M., Wahyuni, T. ., Dayi Febriana, I., Abdullah , M. . and Rohmah, F. (2026) “Biodiesel Synthesis with Different Feedstock Oils: Free Fatty Acid Analysis and Fuel Properties Characterization ”, Indonesian Journal of Chemical Analysis (IJCA), 9(1), pp. 13–26. doi: 10.20885/ijca.vol9.iss1.art2.