EKSTRAKSI BERBANTU ULTRASONIK DAN AKTIVITAS ANTIOKSIDAN EKSTRAK UMBI GADUNG (Dioscorea hispida Dennst) SECARA IN VITRO
DOI:
https://doi.org/10.52434/jfb.v13i1.1240Keywords:
antioksidan, fenol, gadung, ultrasonic-assisted extractionAbstract
Dioscorea hispida Dennst atau di Indonesia dikenal dengan umbi gadung diketahui mengandung senyawa aktif fenol yang dapat memberikan aktivitas antioksidan. Ekstraksi senyawa fenol dari umbi gadung masih belum banyak diteliti. Tujuan penelitian ini adalah untuk mengekstraksi senyawa fenol menggunakan metode ultrasonic-assisted extraction (UAE) dengan pelarut yang bervariasi yaitu air, etanol, dan metanol serta menguji aktivitas antioksidannya. Penentuan kandungan fenol total (TPC) ekstrak secara kuantitatif telah dilakukan menggunakan metode spektrofotometri uv-vis dengan prinsip reaksi reduksi antara Folin–Ciocalteu dengan asam galat. Pengujian aktivitas antioksidan ekstrak menggunakan metode peredaman 2,2-difenil-1-pikrilhidrazil (DPPH). Dari penelitian ini diketahui bahwa senyawa fenol total paling tinggi terdapat pada ekstrak metanol umbi gadung yaitu sebesar 4,467 ± 0,752 gGAE/100 g dengan aktivitas antioksidan terkuat yang dilihat dari nilai IC50-nya yaitu sebesar 4,395 μg/mL.
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