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Scavenger activity evaluation of the clove bud essential oil (Eugenia caryophyllus) and eugenol derivatives employing ABTS+• decolorization
Fecha
2011-10-17Autor
Merchán Arenas, Diego R.
Muñoz Acevedo, Amner
Vargas Méndez, Leonor Y.
Kouznetsov, Vladimir V.
Institución
Resumen
The essential oil (EO) of clove bud dried fruits from Eugenia caryophyllus was
obtained by a conventional hydrodistillation process in an excellent yield
(11.7 %). Its chemical composition was analyzed by GC-MS, identifying eugenol
as a main constituent (60.5%). Four eugenol-like molecules, γ-diisoeugenol,
hydroxymethyleugenol, dihydroeugenol and 1,3-dioxanylphenol, were synthesized using eugenol or isoeugenol as initial precursors under green chemistry
protocols. To evaluate the possible antioxidant capacity of eugenol compounds
including the clove bud EO, the Trolox® Equivalent Antioxidant Capacity value,
obtained by the ABTS+• radical-cation discoloration method, was employed. The
methodology was performed in a UV-Vis reader of 96-well microplates (dilution
methodology), using well-known antioxidant agents (BHA, BHT and vitamin E)
as reference compounds. It was found that the prepared eugenol derivatives
had a more potent free radical scavenger activity than the reference
compounds. In particular, the most active molecules, γ-diisoeugenol and
1,3-dioxanylphenol, were ca. 3-fold more potent than vitamin E.