Perbandingan aktivitas antioksidan ekstrak daging pisang raja sere (Musa AAB ?Pisang Raja Sere?) dengan vitamin A, vitamin C, dan katekin melalui penghitungan bilangan peroksida = The comparison of raja sere banana pulp extract (Musa AAB ?Pisang Raja Sere?) antioxidant activity with vitamin A, vitamin C, and catechin through peroxide value counting