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Raposo R.,Institute Investigacion Y Formacion Agraria Y Pesquera Ifapa Rancho Of La Merced | Ruiz-Moreno M.J.,Institute Investigacion y Formacion Agraria y Pesquera IFAPA Alameda del Obispo | Garde-Cerdan T.,University of La Rioja | Puertas B.,Institute Investigacion Y Formacion Agraria Y Pesquera Ifapa Rancho Of La Merced | And 5 more authors.
LWT - Food Science and Technology | Year: 2016

The feasibility of two hydroxytyrosol commercial products as an alternative to sulfur dioxide (SO2) in Sauvignon wines was evaluated. The hydroxytyrosol enriched products came from synthesis and olive waste. For this purpose wines elaborated with those products were compared with control ones elaborated with SO2. Enological parameters, color related parameters, antioxidant activity, volatile compounds, sensory analysis and olfactometric profile were determined in wines. Moreover, the evolution of wines after bottling was evaluated over six months. No significant differences were found in enological parameters and volatile composition (esters, alcohols and acids). However, significant differences were observed in color related parameters, antioxidant capacity, sensory analysis and olfactometric profile. Hydroxytyrosol-enriched wines resulted more colored and with higher antioxidant activity. Their main sensorial attributes did not correspond with the typical for Sauvignon blanc wines, which was related with a decrease in the odor intensity of the volatile thiol 3-mercaptohexyl acetate. © 2015 Elsevier Ltd.


Lopez-Bernal A.,CSIC - Institute for Sustainable Agriculture | Garcia-Tejera O.,CSIC - Institute for Sustainable Agriculture | Vega V.A.,Institute Investigacion y Formacion Agraria y Pesquera IFAPA Alameda del Obispo | Hidalgo J.C.,Institute Investigacion y Formacion Agraria y Pesquera IFAPA Alameda del Obispo | And 4 more authors.
Irrigation Science | Year: 2015

The measurement of bulk net assimilation (A) in fruit tree species is hindered by the need for sophisticated and complex instrumentation. The aim of this study is to present a simple alternative for estimating A from sap flow measurements and meteorological records. The proposed method was tested in a mature hedgerow olive orchard of 22.2 ha. Within the orchard, an irrigation experiment was established in a small plot including three treatments: a full irrigated control (CI), regulated deficit irrigation (DI) and a treatment mimicking customary orchard irrigation management (FI). Determinations of sap flow, water potential (Ψ) and trunk diameter variations (TDV) were conducted in the three treatments for 3 years. Also, measurements of net ecosystem exchange (NEE) were performed with an eddy covariance system in the centre of the orchard for the first season. The validity of the method was supported by the fact that estimates of A were consistent with both the measured values of NEE and published data regarding the same species under similar environmental and management conditions. Also, differences in A between irrigation treatments were generally in agreement with irrigation applied, transpiration (Ep), Ψ and TDV. It is concluded that the proposed sap flow-based method represents a user-friendly approach to estimate A at the canopy level with potential to study the effects of DI on biomass accumulation. © 2015, Springer-Verlag Berlin Heidelberg.

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