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Reactive oxygen species (ROS) reduction in LPS (1 μg/ml)-stimulated alveolar macrophages from COPD patients with various essential oils (0.0001% dilution) at 1+20 h incubation time (see text for details). Data presented as means ± SD, NAC - N-acetylcysteine (1 mmol/l), orange - orange oil, eucalyptus - eucalyptus oil. #P < 0.05, *P < 0.01 compared with cell medium/LPS alone, non-significant differences among essential oils and NAC.
