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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