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Setiyo Gunawan, Miftahul Hidayah Nugrahini, Mochammad Ferdian Azizi, Safrina Hapsari, Raden Darmawan, Hakun Wirawasista Aparamarta and Firdaus 2025. Extraction of saponin from Calophyllum inophyllum leaves by ultrasound-assisted extraction. Vietnam Journal of Science, Technology and Engineering. 67, 2 (Jun. 2025), 20-27. DOI:https://doi.org/10.31276/VJSTE.2024.0094.