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DPPH assay of Bentong ginger extracted using (a) hot water (H), (b) aqueous (A), and (c) ethanol (E) solvents via sun (S)-, oven (O)-, vacuum (V)- and freeze (Z)-drying methods. Fresh ginger (F) was used as the control. Changes were calculated based on the respective fresh ginger samples. Bars with different letters are significantly different. Sample F-H = Fresh ginger (Control) with hot water, and sample Z-E is freeze-drying with ethanol.
