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Table 4 Test sample's concentration reducing 50% of free radical DPPH (RSa50)

From: Antimicrobial and antioxidant properties of methanol extract, fractions and compounds from the stem bark of Entada abyssinica Stend ex A. Satabie

Test samples RSa50 (μg/ml)
Plant extract and fractions  
Methanol extract 7.12 ± 0.21*
n-hexane fraction 35.87 ± 0.07*
Ethyl acetate fraction 3.07 ± 0.04*
n-butanol fraction 3.10 ± 0.10*
Aqueous residue fraction 7.15 ± 0.08*
Isolated compounds a  
1 298 ± 0.57*
2 1.45 ± 0.00*
3 1.45 ± 0.00*
4 1.60 ± 0.01*
Reference substance  
L-ascorbic acid 0.68 ± 0.00
  1. a 1:(5S,6R,8aR)-5-(carboxymethyl)-3,4,4a,5,6,7,8,8a-octahydro-5,6,8a-Trimethylnaphthalenecarboxylic acid; 2: methyl 3,4,5-trihydroxybenzoate; 3: benzene-1,2,3-triol and 4: 2,3-dihydroxypropyltriacontanoate.
  2. *Scavenging activity significantly lower than the reference, Duncan (p < 0.05).