Resumen

ARGUETA-SOLIS, María G. et al. Inhibition of lipid oxidation and related phenolic constituents in the wood and bark of three oak species (Quercus candicans, Q. laurina, and Q. rugosa). Agrociencia [online]. 2018, vol.52, n.5, pp.757-766. ISSN 2521-9766.

An increasing number of researches have focused on phenols with antioxidant capacities that can fight diseases caused by free radicals. Those phenols can be found in various plants, fruits, and other structures. These substances were also detected in the wood of conifers and some oak species. However, there are few studies about this kind of wood, even though they could be a source of these phenols. Therefore, the objective of this study was to determine the antioxidant capacity and the phenolic profile of the methanolic and aqueous extracts from the sapwood, heartwood, and bark of three oaks (Quercus candicans, Q. laurina, and Q. rugosa). The extracts were obtained by successive extraction with solvents of increasing polarity (cyclohexane, acetone, and methanol) in a Soxhlet equipment, and they were finally subject to hot water with reflux. The antioxidant activity was analyzed through the inhibition of the lipid oxidation, while the phenolic composition of the extracts was analyzed through a HPLC analysis. Higher outputs were obtained from the total extracts with methanol taken from bark. The inhibition of the lipid oxidation was higher when the methanolic extract was taken from the sapwood of Q. rugosa (antioxidant activity: 94.09 %), while the methanolic extract taken from the sapwood of Q. laurina was lower (42.54 %). The phenolic compounds most frequently found in the extracts taken from the three oaks were chlorogenic acid, resorcinol, catechin, and gallic acid. Methanolic and aqueous extracts taken from the wood and bark of three oaks are rich in phenolic compounds with potent antioxidant activity and they are an alternative source of biomolecules.

Palabras llave : extractives; sapwood; heartwood; Quercus spp.; antioxidant activity; phenols.

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