Abstract
A comparative analysis of chemical compounds found in essential oil and ethanol extract from Rhododendron tomentosum Harmaja was conducted in this study. The major volatile components were identified as 4-thujene (27.05%), α-thujenal (12.24%), and (-)-4-terpineol (9.78%) in the essential oil. The contents of total flavonoids and total phenolics in the raw material were 37.9 mg rutin equivalent/g and 4.2 mg gallic acid equivalent/g dry matter, respectively; the contents of ursolic acid, hyperoside, quercetin, and kaempferol were 15.2, 1.29, 0.32, and 0.03 mg/g, respectively. The volatile components in ethanol extract contained α-farnesene (8.35%), n-tetradecane (6.37%), hexadecanoic acid (6.14%), oblivon c (5.89%), and lilac aldehyde (4.85%). Ethanol extract exhibited higher antioxidant capacities than essential oil, which were evaluated by DPPH assay and ABTS assay.
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