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ABSTRAK Kulit buah Mundar ( G . forbesii King.) merupakan tanaman endemik yang berasal dari Kalimantan Selatan yang berpotensi memiliki aktivitas antioksidan. Penelitian ini dilakukan untuk menguji aktivitas antioksidan ekstrak etanol 30% dan 70% kulit buah Mundar ( G . forbesii King.) yang diperoleh dengan metode ekstraksi sokhletasi. Pengujian aktivitas antioksidan dilakukan dengan metode DPPH ( 2,2-Diphenyl-1-Picrylhydrazil ) secara kualititatif dan kuantitatif dengan kuersetin sebagai kontrol positif. Hasil uji aktivitas antioksidan ekstrak etanol 30% dan 70% kulit buah Mundar ( G . forbesii King.) secara kualitatif menunjukkan adanya aktivitas antioksidan yang ditandai dengan noda kuning pada plat kromatografi lapis tipis (KLT) setelah disemprot dengan larutan DPPH 0,1mM. Hasil uji aktivitas antioksidan secara kuantitatif menghasilkan nilai IC 50 ( Inhibitory Concentration ) secara berturut-turut dari ekstrak etanol 30% kulit buah Mundar ( G . forbesii King.); ekstrak etanol 70% kulit buah Mundar ( G . forbesii King.); dan kuersetin adalah 717,01 ppm; 534,69 ppm; dan 2,04 ppm.  Ekstrak etanol 70% kulit buah Mundar ( G . forbesii King.) memiliki aktivitas antioksidan yang lebih baik dibandingkan ekstrak etanol 30% kulit buah Mundar ( G . forbesii King.). Kata kunci: Kulit buah Mundar ( G. forbesii King.), antioksidan, DPPH, kromatografi lapis tipis (KLT), IC 50 ABSTRACT Antioxidants are compounds that can counteract free radicals. Mundar rind (Garcinia forbesii King.) i s endemic plants from South Kalimantan that has the potential antioxidant activity . This research was conducted antioxidant activity test of ethanol ic extract 30% and 70% of Mundar rind (G. forbesii King.) o btained by so xhlet extraction method. Antioxidant activity test of Mundar rind ( G. forbesii King.) used the DPPH (2,2-Diphenyl-1-Picrylhydrazil) method qualit a tively and quantitatively with quercetin as a positive control . The results of the antioxidant activity test qualitatively of ethanol ic extract 30% and 70% of Mundar rind (G. forbesii King.) showed antioxidant activity marked with a yellow s pot with purple background on kromatogram after sprayed with DPPH solution 0,1mM . The results of the antioxidant activity test quantitatively obtained IC 50 (Inhibitory Concentration) value respectively of ethanolic extract 30%; ethanolic extract 70%; and quercetin were 717,01 ppm; 534,69 ppm; and 2,04 ppm. The ethanolic extract 70% of Mundar rind ( G. forbesii King.) had better antioxidant activity than the ethanolic extract 30% of Mundar rind ( G. forbesii King.) K eywords : Mundar rind (G. Forbesii King.), antioxidant, DPPH, thin layer chromatography (TLC), IC 50

Uji Aktivitas Antioksidan Ekstrak Etanol Kulit Buah Mundar (Garcinia forbesii King.) Menggunakan Metode DPPH (2,2-Diphenyl-1-Picrylhydrazil)