Optimization of Ultrasonic Assisted Extraction Process on Antioxidant Activity of Honje Fruit Extract (Etlingera elatior) Using Surface Response Method. Valensi [Internet]. 2021 Nov. 24 [cited 2025 Nov. 28];7(2):118-2. Available from: https://journal.uinjkt.ac.id/valensi/article/view/21396