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Table 5 The effect of seasonal dynamics (dry and wet seasons) on the antioxidant activities of Rosmarinus officinalis leaves harvested in four agro-ecological zones in Kenya

From: Evaluation of seasonal variation, effect of extraction solvent on phytochemicals and antioxidant activity on Rosmarinus officinalis grown in different agro-ecological zones of Kiambu County, Kenya

Antioxidant activity

Agro-ecological zones

Dry season

Wet season

p-values

DPPH inhibition (%)

Lari

93.53 ± 1.71

91.41 ± 4.13

0.496

Kiambaa

83.34 ± 1.73

79.85 ± 3.27

0.060

Juja

61.83 ± 6.68

60.63 ± 4.73

0.637

Thika

84.57 ± 1.79

88.82 ± 1.07

0.058

Mean

80.82 ± 3.39

80.18 ± 3.31

0.92

Ferric reducing antioxidant potential (FRAP) (absorbance)

Lari

1.00 ± 0.05

0.76 ± 0.04

0.002

Kiambaa

0.44 ± 0.03

0.924 ± 0.05

0.0001

Juja

0.67 ± 0.06

0.34 ± 0.05

0.014

Thika

0.30 ± 0.02

0.23 ± 0.03

0.080

Mean

0.602 ± 0.04

0.569 ± 0.043

0.664

  1. Results are means from the ethanolic extraction method. Values are expressed as mean ± Standard Deviation
  2. DPPH diphenyl-1-picrylhydrazyl inhibition, FRAP ferric reducing antioxidant power