Table 2

DPPH scavenging activities and IC50values of the methanolic extracts of two varieties of Zingiber officinale treated with SA and grown under different CO2concentrations (ambient: 400 μmol·mol−1CO2and elevated: 800 μmol·mol−1CO2)
Variety CO2(μmol·mol−1) SA (M) DPPH (%) IC50(μg g-1)
H.Bentong 400 0 38.29±0.55 g 37.4
10-3 52.98±1.209 e 35.8
800 0 61.88±0.636 d 34.2
10-3 68.075±0.403 ab 30.55
H.Bara 400 0 45.35±0.82 f 28.2
10-3 63.7±2.52 cd 25.6
800 0 65.91±0.19 bc 23.71
10-3 70.27±0.431 a 21.46
Positive controls α-tocopherol 93.47±0.77 16.2
BHT 89.27±1.04 20.4

All analyses are the mean of triplicate measurements ± standard deviation; Means not sharing a common letter were significantly different at P < 0.05.

Ghasemzadeh et al.

Ghasemzadeh et al. BMC Complementary and Alternative Medicine 2012 12:229   doi:10.1186/1472-6882-12-229

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