Pengaruh waktu, suhu, dan rasio simplisia dengan pelarut terhadap kandungan fenolik dan flavonoid ekstrak daun kejibeling pada metode Ultrasound-Assisted Enzymatic Aqueous Two-Phase Extraction = Variations in time, temperature, and material-to-Ratio Solvent on Ultrasound-Assisted Enzymatic Aqueous Two-Phase Extraction method for phenolic and flavonoid content kejibeling leaf extract