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Lukmayani, Y., Giffar Abdiljabbar Najmudin and Kiki Mulkiya Yuliawati 2024. TESTING ANTIOXIDANT ACTIVITY AND DETERMINING FLAVONOID CONTENTS OF ETHANOL EXTRACT OF RED BELT LEAVES (Piper ornatum N.E.Br.) USING MACERATION AND ULTRASOUND-ASSISTED EXTRACTION METHODS: PENGUJIAN AKTIVITAS ANTIOKSIDAN SERTA PENETAPAN KADAR FLAVONOID EKSTRAK ETANOL DAUN SIRIH MERAH (Piper ornatum N.E.Br.) DENGAN METODE EKSTRAKSI MASERASI DAN ULTRASOUND-ASSISTED EXTRACTION. Jurnal Ilmiah Farmasi Farmasyifa. 7, 2 (Jul. 2024), 179–191. DOI:https://doi.org/10.29313/jiff.v7i2.3177.