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Table 3 DPPH and FRAP scavenging activities (at concentration of 100 μg/mL) and IC50 value of Z. zerumbet extracts

From: Variation in secondary metabolite production as well as antioxidant and antibacterial activities of Zingiber zerumbet (L.) at different stages of growth

Plant age (month-old)/positive controls Plant parts DPPH free radical scavenging activity (%) IC50 (μg/mL) Ferric reducing antioxidant potential (μM of Fe (II)/g) IC50 (μg/mL)
3 leaf 57.82 ± 3.29d 98.5 ± 4.35d 489.4 ± 20.16d 119.42 ± 4.55d
  stem 15.46 ± 1.15h NO 117.7 ± 6.53i NO
  rhizome 34.76 ± 3.31g 110.9 ± 3.67c 254.0 ± 16.42g 134.8 ± 5.21c
6 leaf 51.66 ± 3.55e 121.4 ± 5.16b 437.1 ± 18.73e 144.6 ± 4.19b
  stem 16.37 ± 1.12h NO 113.6 ± 5.68i NO
  rhizome 59.41 ± 3.68d 86.4 ± 4.19e 429.0 ± 19.42e 99.7 ± 3.55e
9 leaf 43.18 ± 2.49f 149.7 ± 5.48a 377.2 ± 15.27f 164.1 ± 4.79a
  stem 16.48 ± 1.74h NO 127.2 ± 6.46h NO
  rhizome 76.42 ± 3.29b 55.8 ± 4.26f 581.8 ± 22.18b 62.4 ± 3.28g
α-tocopherol   84.19 ± 4.68a 44.8 ± 4.33g 849.4 ± 24.16a 49.1 ± 2.77h
BHT   70.25 ± 2.69c 58.6 ± 4.75f 512.1 ± 17.54c 67.7 ± 3.86f
  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. NO: not observed