Siregar, T.M. and Kusno, F. 2026. Physicochemical Characteristics and Stability of Antioxidant Extracts from Different Varieties of Purple Sweet Potato (Ipomoea batatas L.). Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering). 15, 1 (Feb. 2026), 290–300. DOI:https://doi.org/10.23960/jtepl.v15i1.290-300.