Journal
PLANTS-BASEL
Volume 11, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/plants11192606
Keywords
essential oils; Helichrysum; H. petiolare; H. odoratissimum; H. cymosum; antioxidant; antibacterial; tyrosinase inhibition; sun protection factor
Categories
Funding
- National Research Foundation, South Africa [106055]
- Cape Peninsula University of Technology
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Helichrysum species are important medicinal plants in South Africa, and their essential oils are found to possess low antibacterial activities and moderate antioxidant capacities.
Helichrysum species are prominent South African medicinal plants. From the essential oils (EOs) of three Helichrysum species, H. petiolare, H. odoratissimum, and H. cymosum, sixty-three constituent components were identified, with hydrocarbons and oxygenated monoterpenes and sesquiterpenes as major components. The compounds were analyzed by gas chromatographymass spectrometry (GC-MS) and nuclear magnetic resonance (NMR) spectroscopy. In H. petiolare EO, the major components were faurinone (20.66%) and (E)-beta-ocimene (17.21%). Faurinone was isolated from this EO for the first time. In H. odoratissimum, 1,8-cineole (17.44%) and alpha-pinene, and gamma-curcumene (15.76%) were the major components whereas, in H. cymosum, oc-pinene (29.82%) and (E)-caryophyllene (19.20%) were the major components. In the antibacterial activity study, the EOs were tested against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. The EOs were found to possess low antibacterial, anti-tyrosinase, and photoprotection activities and moderate antioxidant capacities, thus establishing these Helichrysum EOs as valuable antioxidant agents.
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