Combined effect of CO2 enrichment and foliar application of salicylic acid on the production and antioxidant activities of anthocyanin, flavonoids and isoflavonoids from ginger

Table 2 DPPH scavenging activities and IC ₅₀ values of the methanolic extracts of two varieties of Zingiber officinale treated with SA and grown under different CO ₂ concentrations (ambient: 400 μmol·mol ⁻¹ CO ₂ and elevated: 800 μmol·mol ⁻¹ CO ₂ )

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.

ISSN: 2662-7671