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Table 6 DPPH and FRAP scavenging activities (at concentration of 100 µg mL−1) and IC50 value of ethanol extract of P. speciosa seed collected from different locations of Malaysia

From: Assessment and comparison of phytochemical constituents and biological activities of bitter bean (Parkia speciosa Hassk.) collected from different locations in Malaysia

Locations

DPPH free radical scavenging activity (%)

IC50 (µg mL−1)

Ferric reducing antioxidant potential (μM of Fe(II) g−1)

IC50 (µg mL−1)

Perak

66.29 ± 4.88b

86.7 ± 5.80c

522.1 ± 18.29b

91.5 ± 7.83c

Negeri Sembilan

52.47 ± 4.46c

109.2 ± 6.12b

462.5 ± 14.80c

121.2 ± 7.14b

Johor

41.62 ± 2.71d

153.1 ± 6.32a

407.5 ± 11.62d

140.6 ± 8.49a

Positive controls

 α-tocopherol

84.19 ± 5.20a

42.6 ± 3.25e

871.2 ± 20.48a

44.9 ± 3.91e

 BHT

70.58 ± 4.35b

79.6 ± 4.04d

514.5 ± 15.20b

93.5 ± 4.37c

  1. Data are means of triplicate measurements ± standard deviation. Means not sharing a common single letter in each column for each measurement were significantly different at P < 0.05
  2. No represent not observed