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ARTÍCULO
TITULO

Influence of the growing region, quality classification and harvest year on the ORAC (Oxygen Radical Absorbance Capacity) index of Chilean Cabernet Sauvignon red wines

Raquel Bridi    
Sergio Lobato    
Camilo López-Alarcón    
Eduardo Lissi    

Resumen

In the present work, we studied the effect of the growing region (IV, Metropolitan or VI - VII regions), quality classification (?Varietal?, ?Reserva?, and ?Gran Reserva?) and harvest year (2000-2012) on the total phenolic content and antioxidant capacity of thirty-six Chilean Cabernet Sauvignon red wine samples. The Folin-Ciocalteu (FC) and (Oxygen Radical Absorbance Capacity) ORAC methods, employing fluorescein and pyrogallol red as probes, were applied to establish the properties of the wine samples. The obtained results show a strong dependence at of the three indexes on the grape growing region, with higher values obtained in wines from the IV region. These results can be related to the climatic characteristics of this Region, which include dry weather and large temperature differences (nearly 20 °C) between day and night. En el presente estudio se evaluó el contenido de compuestos fenólicos y la actividad antioxidante de treinta y seis Cabernet Sauvignon vinos tintos chilenos de diferentes zonas geográficas (IV, Metropolitana y VI - VII regiones), distintos tipos de guarda (?Varietal?, ?Reserva?, and ?Gran Reserva?) y diferentes años de cosecha (2000-2012). El contenido total de fenoles fue determinado por el método de Folin-Ciocalteau (FC) y la actividad antioxidante fue evaluada por medio del ensayo ORAC (Oxygen Radical Absorbance Capacity) utilizando fluoresceína y rojo de pirogalol como moléculas blanco. Los resultados indicaran una fuerte influencia de la zona geográfica de cultivo en los tres índices estudiados, con valores superiores en los vinos procedentes de la IV región. Este resultado puede ser explicado en base a las características climáticas de esta región, la que se caracteriza por tiempo seco y diferencias de temperatura entre día y noche que superan los 20 grados.

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