Grasas y Aceites, Vol 60, No 2 (2009)

Quality of extra virgin olive oil affected by several packaging variables


https://doi.org/10.3989/gya.043308

José Luis Guil-Guerrero
Universidad de Almería, Spain

Abstract


The aim of this study was to determine the evolution of the quality index of three extra-virgin olive oil varieties (EVOO), stored according to different packaging variables for one year. The selected quality parameters were: acidity index, peroxide value (PV), K270 coefficient, fatty acid (FA) profile, carotenoids and chlorophylls. This study was carried out by monthly analyzing several bottled EVOO varieties -Picual, Hojiblanca and Arbequina- obtained during the present harvesting season. In addition, other Picual EVOO stored in a mill deposit, as well as bottled Picual EVOO from the previous harvesting season were analyzed monthly. The oils were packaged in dark and transparent glass bottles. The results showed that the acidity and K270 parameters increased slightly in all cases, while PV value changes were significant in EVOOs stored in transparent glass bottles. FA profiles were slightly modified throughout the storage period, although oleic acid slightly increased at the end of the analytical period, especially in the EVOO stored in deposits. Regarding pigment, chlorophylls losses were more noticeable than those related to carotenoid. According to the present results, the best packaging conditions for EVOO were deposits, followed by dark glass bottles. In addition, this study demonstrated that EVOO collected from the previous harvesting season and stored under nitrogen atmosphere could be packaged in glass bottles without appreciable quality changes, as compared with EVOO packaged in the same bottles and obtained during the current harvesting season.

Keywords


Extra virgin; Oleic acid; Olive oil; Olive oil storage; Olive oil varieties

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