Lukmayani, Y.; Giffar Abdiljabbar Najmudin; Kiki Mulkiya Yuliawati. 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. JIFF 2024, 7, 179-191.