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Table 3 Antioxidant capacities of the crude ethanolic extract of S. asper leaves and its fractions determined by the DPPH and ABTS scavenging assays

From: Acid-base fractions separated from Streblus asper leaf ethanolic extract exhibited antibacterial, antioxidant, anti-acetylcholinesterase, and neuroprotective activities

Sample

DPPH scavenging assay

ABTS scavenging assay

%Radical Scavenging activity (of 1 mg/mL sample)

mg VCEAC/g dry weight sample

%Radical Scavenging activity (of 1 mg/mL sample)

mg VCEAC/g dry weight sample

Crude extract

16.58 ± 1.33a

18.37 ± 1.25a

37.69 ± 1.81a

31.52 ± 1.63a

Neutral fraction

8.94 ± 0.78b

10.63 ± 1.38b

34.29 ± 1.56b

29.02 ± 1.43b

Acidic fraction

17.16 ± 1.74a

18.88 ± 1.39a

48.45 ± 1.55c

39.45 ± 1.43c

Basic fraction

8.94 ± 1.62b

10.00 ± 0.77b

39.23 ± 0.66a

32.66 ± 0.84a

  1. Results are expressed as mean ± SD of at least three replicates
  2. Different superscript letters in the same column indicate a significant difference between the means by one-way ANOVA (p < 0.05) and the same letter indicates that there is no statistical difference