Skip to main content

Table 3 Antioxidant activity (%) of crude and fractionated extracts at various concentrations assayed by β-carotene bleaching assay

From: Antioxidant potential, cytotoxic activity and total phenolic content of Alpinia pahangensis rhizomes

Concentrations (mg/ml) Antioxidant activity of crude methanol extract and its fractions  
  Methanol extract Hexane fraction Ethyl acetate fraction Water fraction BHA
4 66.06 ±0.63dw 23.92 ±4.46aw 59.64 ± 1.44cw 50.03 ± 2.67bw 81.51 ± 0.67ew
8 74.73 ±1.84cx 42.17 ± 3.41ax 72.35 ± 2.30cx 57.54 ± 1.83bx 84.50 ± 0.21dx
16 77.84 ±0.41cy 52.62 ± 2.21ay 72.87 ± 1.73bx 71.74 ± 1.80by 89.54 ± 0.27dy
20 81.21 ±0.91cz 56.80 ± 2.70ay 74.51 ± 0.53bx 74.79 ± 1.56by 92.92 ± 0.23dz
  1. Values expressed are mean ± standard deviation of triplicate measurements. For the same extract or standard with different concentrations, means in the same column with different letters (w-z) were significantly different (p < 0.05, ANOVA). For different extracts with the same concentration, means in the same row with different letters (a-e) were significantly different (p < 0.05, ANOVA). BHA was used as the standard.