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Chemical composition and antioxidant activity of Plectranthus grandis and P. ornatus essential oils from north‐eastern Brazil
Author(s) -
de Albuquerque Roberto Lima,
de Vasconcelos Silva Maria Goretti,
Machado Maria Iracema L.,
de A. Matos Francisco José,
de Morais Selene Maia,
Neto Jason Stone
Publication year - 2006
Publication title -
flavour and fragrance journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 70
eISSN - 1099-1026
pISSN - 0882-5734
DOI - 10.1002/ffj.1730
Subject(s) - thymol , eugenol , plectranthus , chemistry , lamiaceae , essential oil , dpph , methyl eugenol , traditional medicine , caryophyllene , botany , antioxidant , germacrene , horticulture , food science , organic chemistry , biology , pest analysis , medicine , tephritidae
The Plectranthus species (Lamiaceae) have been used in traditional medicine in several places around the world, including Brazil, to treat different diseases. P. grandis and P. ornatus , growing in north‐eastern Brazil, were collected at four different times of day and the essential oils from the leaves were analysed by GC–MS. The oil of P. grandis contained mainly trans ‐ β ‐caryophyllene (31.3–40.2%), germacrene D (12.5–24.5%) and eugenol (15.4%) and the oil of P. ornatus contained trans ‐ β ‐caryophyllene (9.6–62.4%), eugenol (38.0%) and thymol (14.1%) as the major components. The oils were submitted to DPPH antioxidant assay. The oil of P. ornatus showed a higher antioxidant activity than that of P. ornatus , probably due to its higher yield of the phenolic compounds eugenol and thymol. Copyright © 2006 John Wiley & Sons, Ltd.