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Table 4 Antioxidant activity and free radical scavenging activity of the essential oils of Plectranthus species

From: Phytochemical analysis and evaluation of the cytotoxic, antimicrobial and antioxidant activities of essential oils from three Plectranthus species grown in Saudi Arabia

Samples aTotal antioxidant Activity in % (1000 μg/mL) Free Radical Scavenging Activity in % (DPPH-radical scavenging assay)
10 50 100 (μg/mL) 500 1000
P. cylindraceus 71.1 ± 4.5a 25.1 ± 4.2c 39.4 ± 3.5a 50.2 ± 4.3 70.5 ± 3.9a 75.9 ± 4.0b
P. asirensis 52.5 ± 4.9a 15.6 ± 3.9b 20.4 ± 3.8c 36.9 ± 1.6a 46.5 ± 4.1 55.1 ± 2.9b
P. barbatus 62.9 ± 5.1b 21.1 ± 4.8b 30.5 ± 4.1a 44.5 ± 3.1b 60.6 ± 3.8c 68.2 ± 3.2a
Ascorbic acid NT 81.4 ± 5.2 87.2 ± 3.8 91.0 ± 4.5c 93.0 ± 3.8a 94.1 ± 4.4c
Rutin 88.2 ± 5.1b NT NT NT NT NT
  1. aβ-carotene bleaching assay, NT not tested. In the columns, means ± SD with different letters notification are significant at (P < 0.05) (n = 3)