Grasas y Aceites, Vol 64, No 1 (2013)

Sensory analysis and volatile compounds of olive oil (cv. Cobrançosa) from different irrigation regimes


https://doi.org/10.3989/gya.069712

A. A. Fernandes-Silva
CITAB-Centre for the Research and Technology of Agro-Environment and Biological Sciences, University of Trás-os-Montes e Alto Douro - School of Agriculture and Veterinary Sciences, Department of Agronomy, University of Trás-os-Montes e Alto Douro, Portugal

V. Falco
CQVR – Chemistry Research Centre, University of Trás-os-Montes e Alto Douro, Portugal

C. M. Correia
CITAB-Centre for the Research and Technology of Agro-Environment and Biological Sciences, University of Trás-os-Montes e Alto Douro - School of Life and Environment Sciences, Department of Biology and Environment, University of Trás-os-Montes e Alto Douro, Portugal

F. J. Villalobos
Departamento de Agronomía, Universidad de Córdoba - Instituto de Agricultura Sostenible, CSIC, Spain

Abstract


The aim of this study was to assess the effect of different irrigation strategies on the sensory quality of virgin olive oil (VOO) from the cv. “cobrançosa” integrated into a protected denomination of origin of “Azeite de Trás-os-Montes” in the Northeast of Portugal. Three irrigation treatments were applied: (T2)-full irrigation, which received a seasonal water equivalent of 100% of the estimated crop evapotranspiration (ETc), (T1)-continuous deficit irrigation (30% ETc) and (T0)- rainfed treatment. Data were collected from two consecutive crop years (2005-2006). Olive oil samples were analyzed for volatiles by GC-MS and the results compared with sensory evaluation data. Total volatile compounds tended to decrease with the amount of water applied. The characteristics pungent and bitter were more pronounced in olive oils from T0 and T1, which had higher polyphenolic concentrations, with a strong positive relationship with this variable and the bitter attribute. The Principal Components Analysis clearly separates the three olive oils from 2005, the driest year, and aggregates into a single group the three samples from 2006, suggesting no effect of irrigation on volatile compounds in years with a rainy spring and a marked effect in years with severe drought, suggesting that the effect of the trees’ water status on these variables occurs throughout the crop season and not just during the oil accumulation phase. In general, olive oil from the cv. Cobrançosa is more bitter than pungent and has a typical nutty sensory attribute shown by a strong positive relationship between benzaldehyde and the sensory notes of almonds and nuts.

Keywords


Principal Components Analysis; Sensory attributes; Virgin olive oil

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