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Table 2 Total phenolic and flavonoid contents and antioxidant activity of different extracts from Vanda roxburghii

From: Vanda roxburghii chloroform extract as a potential source of polyphenols with antioxidant and cholinesterase inhibitory activities: identification of a strong phenolic antioxidant

Sample TPC TFC DPPH OH FRAP
(mg GAE/g dried extract) (mg CE/g dried extract) IC50 (μg/mL) IC50 (μg/mL) (absorbance at 100 μg/mL)
PEF 23.6 ± 0.21(a) 67.9 ± 1.35(a) 35.02 ± 1.56(d) 23.91 ± 1.58(c) 0.810 ± 0.02(b)
CLF 85.9 ± 1.03(d) 300.1 ± 0.61(d) 5.76 ± 0.42(a) 7.96 ± 0.61(a) 1.397 ± 0.04(d)
EAF 66.7 ± 0.73(c) 164.44 ± 0.85(c) 18.70 ± 0.78(b) 11.13 ± 0.72(a) 1.237 ± 0.04(c)
AQF 36.3 ± 0.60(b) 112.1 ± 0.95(b) 24.86 ± 1.12(c) 15.98 ± 0.86(b) 0.333 ± 0.01(a)
CA - - 4.55 ± 0.33(a) 9.45 ± 0.57(a) 1.48 ± 0.03(e)
  1. Means in each column with different subscript letters (a b, c, d, e) differ significantly (P <0.05)
  2. PEF petroleum ether fraction, CLF chloroform fraction, EAF ethylacetate fraction, AQF aqueous fraction, CA catechin, TPC Total phenolic content, TFC Total flavonoid content, OH Hydroxyl radical scavenging, FRAP Ferric reducing antioxidant power