Screw press extraction of almond (Prunus dulcis (Miller) D.A. Webb): Oil recovery and oxidative stability

Martínez, Marcela Lilian; Penci, María Cecilia; Marín, María Andrea; Ribotta, Pablo Daniel; Maestri, Damián

doi:10.1016/j.jfoodeng.2013.05.010

Cited by 53 publications

(48 citation statements)

References 29 publications

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“…In addition, the oil obtained at the optimum extraction condition showed an OSI value (2.09 ± 0.08 h) and FA percentages (palmitic acid, 7.03 ± 1.30%; palmitoleic acid, 0.06 ± 0.00%; stearic acid, 2.72 ± 0.20%; oleic acid, 19.3 ± 2.01%; linoleic acid, 56.7 ± 1.68% and linolenic acid, 14.2 ± 0.12%) in accordance with those reported elsewhere (Martinez et al, 2006;Martinez et al, 2010). On the basis of the results obtained under pilot scale extraction conditions (Martínez et al, 2013), a preliminary exploratory experimental study (data not shown) using the industrial screw-press in which the behavior of the almond with a moisture content of 8%, 10% and 12% (w.b.) and a restriction die of 10 mm was evaluated.…”

Section: Resultsmentioning

confidence: 99%

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Walnut and almond oil screw-press extraction at industrial scale: Effects of process parameters on oil yield and quality

et al. 2018

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Walnut and almond kernels are highly nutritious mainly due to their high oil contents. In this study, 32 factorial experimental designs were used to optimize processes for oil extraction by screw-pressing at industrial scale. Experimental designs included seed moisture content (SMC), and restriction die (RD) as the main processing parameters. Theoretical models were scanned against experimental data in order to optimize oil extraction conditions. The response variables analyzed were oil yield (OY), fine solid content (FC) in oil, and oil quality parameters. Fitted models for OY indicated maximum predicted values similar to the highest experimental values. Walnut oil extractions showed a maximum OY (84.5 ± 2.3 %) at 7.21% SMC, and 10 mm RD. For almond kernels, maximum OY (71.9 ± 3.5%) was obtained at 9.42% SMC, and 12 mm RD. Chemical quality parameters from both oils were in the ranges stated in Codex (FAO/WHO) standards for virgin (non-refined) oils.

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Section: Resultsmentioning

confidence: 99%

“…Both walnut and almond kernels contain high levels of oil (52 -70 and 48 -67%, respectively) (Martínez et al, 2008;Martínez et al, 2013;Martínez and Maestri, 2015). Walnut oil (WO) is mainly composed of polyunsaturated fatty acid (linoleic and linolenic acids together represent 65 -75% of the total fatty acid (FA) content).…”

Section: Introductionmentioning

confidence: 99%

Walnut and almond oil screw-press extraction at industrial scale: Effects of process parameters on oil yield and quality

et al. 2018

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“…Almond oil can be extracted easily by screw pressing (Martínez, Penci, Marin, Ribotta, & Maestri, 2013). Employing a pilot plant screw-press, the highest oil recovery (440 g/kg kernel) was achieved at 8 g/100 g kernel moisture and 40°C pressing temperature.…”

Section: Introductionmentioning

confidence: 99%

Variability in almond oil chemical traits from traditional cultivars and native genetic resources from Argentina

et al. 2015

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“…The rising global production of almonds, together with the demand for new oil specialties, make it necessary to research appropriate methods for improving almond oil production. Its quantitative and qualitative extraction is essential to determine the feasibility of transforming it into a commercial produc (Martínez et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…In some screw presses, temperature is hard to control and, therefore, the yield presents higher variations (Álvarez-Ortí et al, 2012). Recently Martínez et al (2013), evaluated the combined effects of almond humidity (4, 6, 8, 10 y 12%) and preheating press temperature (20, 40 y 60 ºC) on the yield and the quality of obtained oils, and observed that the largest quantity of oil (79,3%) was obtained with a seed humidity of 8% and a preheating temperature of 40 °C. The increase in humidity from 4 to 8% resulted in a higher yield but a posterior increase from 8 to 12%, caused a light decrease.…”

Section: Almond Oil Extractionmentioning

confidence: 99%

Virgin almond oil: Extraction methods and composition

Roncero¹,

Álvarez‐Ortí²,

Pardo-Giménez³

et al. 2016

Grasas y Aceites

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SUMMARY:In this paper the extraction methods of virgin almond oil and its chemical composition are reviewed. The most common methods for obtaining oil are solvent extraction, extraction with supercritical fluids (CO 2 ) and pressure systems (hydraulic and screw presses). The best industrial performance, but also the worst oil quality is achieved by using solvents. Oils obtained by this method cannot be considered virgin oils as they are obtained by chemical treatments. Supercritical fluid extraction results in higher quality oils but at a very high price. Extraction by pressing becomes the best option to achieve high quality oils at an affordable price. With regards chemical composition, almond oil is characterized by its low content in saturated fatty acids and the predominance of monounsaturated, especially oleic acid. Furthermore, almond oil contains antioxidants and fat-soluble bioactive compounds that make it an oil with interesting nutritional and cosmetic properties. KEYWORDS:Almond; Chemical composition; Extraction; Oil; Quality RESUMEN: Aceite de almendra virgen: Métodos de extracción y composición. En este trabajo se revisan los métodos de extracción del aceite de almendra virgen y su composición química. Los métodos más habituales para la obtención del aceite son la extracción con disolventes, la extracción con fluidos supercríticos (CO 2 ) y los sistemas de presión (prensas hidráulica y de tornillo). El mayor rendimiento industrial, pero también la peor calidad de los aceites, se consigue mediante el uso de disolventes. Además, los aceites obtenidos por este método no se pueden considerar vírgenes, pues se obtienen por medio de tratamientos químicos. La extracción con fluidos supercríticos da lugar a aceites de mayor calidad pero a un precio muy elevado. La extracción mediante prensado se convierte en la mejor opción de extracción, al conseguir aceites de alta calidad a un precio asequible. En cuanto a su composición química, el aceite de almendra se caracteriza por su bajo contenido en ácidos grasos saturados y el predominio de los monoinsaturados, en especial en ácido oleico. Además, el aceite de almendra contiene compuestos bioactivos liposolubles y antioxidantes que lo convierten en un aceite con interesantes propiedades nutricionales y cosméticas.

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Screw press extraction of almond (Prunus dulcis (Miller) D.A. Webb): Oil recovery and oxidative stability

Cited by 53 publications

References 29 publications

Walnut and almond oil screw-press extraction at industrial scale: Effects of process parameters on oil yield and quality

Walnut and almond oil screw-press extraction at industrial scale: Effects of process parameters on oil yield and quality

Variability in almond oil chemical traits from traditional cultivars and native genetic resources from Argentina

Virgin almond oil: Extraction methods and composition

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