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Giuseppe Fregapane - One of the best experts on this subject based on the ideXlab platform.
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Influence of extraction system, production year and area on Cornicabra virgin olive oil: a study of five Crop Seasons
Food Chemistry, 2003Co-Authors: María Desamparados Salvador, F. Aranda, Sergio Gómez-alonso, Giuseppe FregapaneAbstract:This paper describes a study of the influence of the extraction system, Crop Season and production area on the chemical composition and quality of Cornicabra virgin olive oils (n=152) from five successive Crop Seasons (from 1994/1995 to 1998/1999). Analysis of the effect of the extraction system (dual-phase, triple-phase decanters and pressure) on the values of analytical determinations, revealed statistically significant differences (P40.05) in a few parameters only, mainly in antioxidant content (total phenols and a-tocopherol) and oxidative stability. All quality indices and major fatty acid and sterol compositions presented significant statistical differences (P40.001) with respect to the year of production, with the exception of total phenols. The Crop Season is therefore a critical variable, since the chemical composition of the olive oil may vary considerably from one year to the next. Many of the analytical parameters varied among the five production areas considered, in the provinces of Toledo and Ciudad Real. The results appear to confirm the general consensus on the quality of Cornicabra virgin olive oils from Castilla-La Mancha, namely that oils from mills located in the south and southeast of the province of Toledo are generally of higher quality. # 2002 Elsevier Science Ltd. All rights reserved.
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Contribution of chemical components of cornicabra virgin olive oils to oxidative stability. A study of three successive Crop Seasons
Journal of the American Oil Chemists' Society, 1999Co-Authors: María Desamparados Salvador, F. Aranda, Giuseppe FregapaneAbstract:Oxidation is the primary cause of virgin olive oil quality deterioration. This paper presents a correlation between oxidative stability, as determined by the Rancimat method, and some chemical components involved in the oxidation process of a set of 74 Cornicabra virgin olive oils obtained from three successive Crop Seasons (94/95 to 96/97). Results showed a clear influence of total polyphenols on virgin olive oil stability, with linear regression coefficients which were similar for the three Seasons studied, and a much lower contribution of α-tocopherol and unsaturated fatty acids, mainly linoleic acid. A significant effect dependent on the Crop Season was also observed.
María Desamparados Salvador - One of the best experts on this subject based on the ideXlab platform.
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Influence of extraction system, production year and area on Cornicabra virgin olive oil: a study of five Crop Seasons
Food Chemistry, 2003Co-Authors: María Desamparados Salvador, F. Aranda, Sergio Gómez-alonso, Giuseppe FregapaneAbstract:This paper describes a study of the influence of the extraction system, Crop Season and production area on the chemical composition and quality of Cornicabra virgin olive oils (n=152) from five successive Crop Seasons (from 1994/1995 to 1998/1999). Analysis of the effect of the extraction system (dual-phase, triple-phase decanters and pressure) on the values of analytical determinations, revealed statistically significant differences (P40.05) in a few parameters only, mainly in antioxidant content (total phenols and a-tocopherol) and oxidative stability. All quality indices and major fatty acid and sterol compositions presented significant statistical differences (P40.001) with respect to the year of production, with the exception of total phenols. The Crop Season is therefore a critical variable, since the chemical composition of the olive oil may vary considerably from one year to the next. Many of the analytical parameters varied among the five production areas considered, in the provinces of Toledo and Ciudad Real. The results appear to confirm the general consensus on the quality of Cornicabra virgin olive oils from Castilla-La Mancha, namely that oils from mills located in the south and southeast of the province of Toledo are generally of higher quality. # 2002 Elsevier Science Ltd. All rights reserved.
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Contribution of chemical components of cornicabra virgin olive oils to oxidative stability. A study of three successive Crop Seasons
Journal of the American Oil Chemists' Society, 1999Co-Authors: María Desamparados Salvador, F. Aranda, Giuseppe FregapaneAbstract:Oxidation is the primary cause of virgin olive oil quality deterioration. This paper presents a correlation between oxidative stability, as determined by the Rancimat method, and some chemical components involved in the oxidation process of a set of 74 Cornicabra virgin olive oils obtained from three successive Crop Seasons (94/95 to 96/97). Results showed a clear influence of total polyphenols on virgin olive oil stability, with linear regression coefficients which were similar for the three Seasons studied, and a much lower contribution of α-tocopherol and unsaturated fatty acids, mainly linoleic acid. A significant effect dependent on the Crop Season was also observed.
L S Pereira - One of the best experts on this subject based on the ideXlab platform.
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effects of water deficits on growth yield and water productivity of drip irrigated onion allium cepa l in an arid region of northwest china
Irrigation Science, 2013Co-Authors: Jianhua Zheng, Guanhua Huang, Jun Wang, Quanzhong Huang, L S Pereira, Xu XuAbstract:Aiming at investigating an appropriate irrigation management strategy that could lead to increase onions yields and improve water productivity (WP), a two-year field experiment was conducted in the arid region of Northwest China with drip irrigation and plastic mulch. Eight treatments were considered: four with different levels of water stress throughout the Crop Season, and four where water stress was applied at the establishment, development, bulbification and ripening stages. The Seasonal actual evapotranspiration (ETa), plant height, above-ground biomass, yield (total, high-quality and marketable quality yields) as well as related irrigation and total water productivity were determined. Plant heights, above-ground biomass and the referred yields have shown to be sensitive to water stress, particularly during the development and bulbification stages. Due to the importance of quality of horticultural products, the WP computed with the yields of high-quality bulbs revealed the most informative contrarily to the WP computed with the total yields. It could be concluded that water stress has to be avoided during the development and bulbification stages, and only small deficits are acceptable if applied throughout the Crop Season.
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two dimensional modeling of water and nitrogen fate from sweet sorghum irrigated with fresh and blended saline waters
Agricultural Water Management, 2012Co-Authors: Tiago B Ramos, Jiři Simůnek, M C Goncalves, J C Martins, A Prazeres, L S PereiraAbstract:Abstract The need for reducing irrigation water demand and non-point source pollution all across Europe has made sweet sorghum [ Sorghum bicolor (L.) Moench], due to its lower water and nutrient requirements, an interesting alternative to other traditional summer Crops in European Mediterranean regions. HYDRUS-2D was used to model the fate of nitrogen in a plot planted with sweet sorghum grown under Mediterranean conditions between 2007 and 2010, while considering drip irrigation scenarios with different levels of nitrogen and salty waters. HYDRUS-2D simulated water contents, EC sw , and N NH 4 + and N NO 3 − concentrations continuously for the entire duration of the field experiment, while producing RMSE between simulated and measured data of 0.030 cm 3 cm −3 , 1.764 dS m −1 , 0.042 mmol c L −1 , and 3.078 mmol c L −1 , respectively. Estimates for sweet sorghum water requirements varied between 360 and 457 mm depending upon the Crop Season and the irrigation treatment. Sweet sorghum proved to be tolerant to saline waters if applied only during one Crop Season. However, the continuous use of saline waters for more than one Crop Season led to soil salinization, and to root water uptake reductions due to the increasing salinity stress. The relation found between N NO 3 − uptake and dry biomass yield ( R 2 = 0.71) showed that nitrogen needs were smaller than the uptakes estimated for the scenario with the highest levels of nitrogen application. The movement of N out of the root zone was dependent on the amount of water flowing through the root zone, the amount of N applied, the form of N in the fertilizer, and the timing and number of fertigation events. The simulations with HYDRUS-2D were useful to understand the best strategies toward increasing nutrient uptake and reducing nutrient leaching. In this sense, N NO 3 − uptakes were higher when fertigation events were more numerous and the amounts applied per event smaller.
F. Aranda - One of the best experts on this subject based on the ideXlab platform.
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Influence of extraction system, production year and area on Cornicabra virgin olive oil: a study of five Crop Seasons
Food Chemistry, 2003Co-Authors: María Desamparados Salvador, F. Aranda, Sergio Gómez-alonso, Giuseppe FregapaneAbstract:This paper describes a study of the influence of the extraction system, Crop Season and production area on the chemical composition and quality of Cornicabra virgin olive oils (n=152) from five successive Crop Seasons (from 1994/1995 to 1998/1999). Analysis of the effect of the extraction system (dual-phase, triple-phase decanters and pressure) on the values of analytical determinations, revealed statistically significant differences (P40.05) in a few parameters only, mainly in antioxidant content (total phenols and a-tocopherol) and oxidative stability. All quality indices and major fatty acid and sterol compositions presented significant statistical differences (P40.001) with respect to the year of production, with the exception of total phenols. The Crop Season is therefore a critical variable, since the chemical composition of the olive oil may vary considerably from one year to the next. Many of the analytical parameters varied among the five production areas considered, in the provinces of Toledo and Ciudad Real. The results appear to confirm the general consensus on the quality of Cornicabra virgin olive oils from Castilla-La Mancha, namely that oils from mills located in the south and southeast of the province of Toledo are generally of higher quality. # 2002 Elsevier Science Ltd. All rights reserved.
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Contribution of chemical components of cornicabra virgin olive oils to oxidative stability. A study of three successive Crop Seasons
Journal of the American Oil Chemists' Society, 1999Co-Authors: María Desamparados Salvador, F. Aranda, Giuseppe FregapaneAbstract:Oxidation is the primary cause of virgin olive oil quality deterioration. This paper presents a correlation between oxidative stability, as determined by the Rancimat method, and some chemical components involved in the oxidation process of a set of 74 Cornicabra virgin olive oils obtained from three successive Crop Seasons (94/95 to 96/97). Results showed a clear influence of total polyphenols on virgin olive oil stability, with linear regression coefficients which were similar for the three Seasons studied, and a much lower contribution of α-tocopherol and unsaturated fatty acids, mainly linoleic acid. A significant effect dependent on the Crop Season was also observed.
Charles Mbohwa - One of the best experts on this subject based on the ideXlab platform.
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bagasse energy cogeneration potential in the zimbabwean sugar industry
Renewable Energy, 2003Co-Authors: Charles MbohwaAbstract:The cogeneration of steam and electricity has become the norm in the sugarcane industry worldwide. This process has been taken further to a stage where sugar companies can export a substantial amount of energy to the grid. Mauritius and Reunion Islands have implemented state of the art technology in bagasse energy cogeneration. It is on this basis that the potential for cogeneration in Zimbabwe’s sugar industry is being examined. The findings indicate that it is technically feasible to implement such a project. A full economic and financial feasibility study would still need to be done. Two plants of 105 MW each can be put in place, providing about 517 GWh of clean bagasse firm power to the Zimbabwe Electricity Supply Authority. Bagasse would be used during the Crop Season and coal during the off-Crop Season. Coal usage during the off-Season, will enable the exportation of extra power to the grid. This kind of project, which can save money for the utility, meets about 8% of the country’s electrical energy needs, reduces the amount of foreign currency needed to import electricity, results in improved efficiency in the sugar industry and can avoid the use of 293 750 tonnes of coal, hence avoiding the emission of 885 000 tonnes of carbon dioxide and the production of 47 000 tonnes of coal ash. The sugar millers would accrue revenue benefits equal to those revenues from selling sugar that accrue to the milling activities only.