Abstract
The Garrigues territorial quality label (Les Garrigues D.O.) is located in the southern part of Lleida (Catalonian. Spain). The most oil produced in this D.O. corresponds to extra virgin classification and it has a distinctive sensorial quality, as a consecuence of olive cultivar («Arbequina» cv) and the careful elaboration of oil. The new cultural technologies applied to the olive tree cultivar and.the new technologies of olive oil extraction have made necessary the study of oil composition and quality during consecutive harvests, to know if the quality could be afected. The objective of this work is the characterization of virgin olive oils (67 samples from 13 olive mills) during the 1995/96 harvest. Analytical controls show that the mean acidity index is 0.17% in oleic acid, the mean peroxide value is 6.9 meq oxygene active/kg of oil and the mean K 270 of 0.21; these quality parameters fulfill the policy values of «Les Garrigues» D.O. The mean polyphenol content is 152 ppm expressed as cafeic acid, with a great variability among olive mills. As harvesting time progresses, the concentration of pigments in olive oil decreases. The concentration of chlorophyl and that of carotenoid pigments at the begin of the harvest is 15 and 12.6 mg/kg of oil respectively and at the end of the period they are 6 and 4.6 mg/kg of oil respectively. The oil color, expressed as visual ABT index and the chromatic ordinates CIELAB, lies within the yellow zone and does not vary along the harvest season.
Highlights
Quality of virgin olive oil from territorial quality label «Les Garrigues» D.O
Analytical controls show that the mean acidity index is 0.17% in oleic acid, the mean peroxide value is 6.9 meq oxygène active/kg of oil and the mean K270 of 0.21 ; these quality parameters fulfill the policy values of «Les Garrigues» D.O
Para la determinación de los índices generales de calidad del aceite de oliva virgen se ha seguido la metodología descrita en el Reglamento n- 2568/91 de la C.E.E., del 11 de julio de 1991 (D.O.C.E. n^ L 248, del 5 de septiembre de 1991) en lo relativo al grado de acidez, índice de peróxidos y prueba espectrofotométrica en el ultravioleta
Summary
Quality of virgin olive oil from territorial quality label «Les Garrigues» D.O. The Garrigues territorial quality label (Les Garrigues D.O.) is located in the southern part of Lleida The most oil produced in this D.O. corresponds to extra virgin classification and it has a distinctive sensorial quality, as a consecuence of olive cultivar («Arbequina» cv) and the careful elaboration of oil. Analytical controls show that the mean acidity index is 0.17% in oleic acid, the mean peroxide value is 6.9 meq oxygène active/kg of oil and the mean K270 of 0.21 ; these quality parameters fulfill the policy values of «Les Garrigues» D.O. The mean polyphenol content is 152 ppm expressed as cafeic acid, with a great variability among olive mills. The concentration of pigments in olive oil decreases. KEY-WORDS: Arbequina variety— Colour— Olive oil — Pigment — Polyphenol — Quality
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