Grasas y Aceites, Vol 68, No 4 (2017)

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


https://doi.org/10.3989/gya.0554171

M. L. Martínez
Instituto Multidisciplinario de Biología Vegetal (IMBIV-CONICET) - Instituto de Ciencia y Tecnología de los Alimentos (ICTA). Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN) - Departamento de Química Industrial y Aplicada. Facultad de Ciencias Exactas. Físicas y Naturales (FCEFyN) - Universidad Nacional de Córdoba, Argentina
orcid http://orcid.org/0000-0002-6236-7903

M. G. Bordón
Instituto de Ciencia y Tecnología de los Alimentos (ICTA). Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN) - Instituto de Ciencia y Tecnología de los Alimentos Córdoba (ICYTAC–CONICET) - Universidad Nacional de Córdoba, Spain
orcid http://orcid.org/0000-0003-0249-7535

R. M. Bodoira
Instituto Multidisciplinario de Biología Vegetal (IMBIV-CONICET) - Instituto de Ciencia y Tecnología de los Alimentos (ICTA). Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN) - Universidad Nacional de Córdoba, Argentina
orcid http://orcid.org/0000-0002-3808-7899

M. C. Penci
Instituto de Ciencia y Tecnología de los Alimentos (ICTA). Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN) - Departamento de Química Industrial y Aplicada. Facultad de Ciencias Exactas. Físicas y Naturales (FCEFyN) - Instituto de Ciencia y Tecnología de los Alimentos Córdoba (ICYTAC–CONICET) - Universidad Nacional de Córdoba, Spain
orcid http://orcid.org/0000-0003-4953-4356

P. D. Ribotta
Instituto de Ciencia y Tecnología de los Alimentos (ICTA). Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN) - Departamento de Química Industrial y Aplicada. Facultad de Ciencias Exactas. Físicas y Naturales (FCEFyN) - Instituto de Ciencia y Tecnología de los Alimentos Córdoba (ICYTAC–CONICET) - Universidad Nacional de Córdoba, Argentina
orcid http://orcid.org/0000-0001-7883-8856

D. M. Maestri
Instituto Multidisciplinario de Biología Vegetal (IMBIV-CONICET) - Instituto de Ciencia y Tecnología de los Alimentos (ICTA). Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN) - Universidad Nacional de Córdoba, Argentina
orcid http://orcid.org/0000-0002-1104-9323

Abstract


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.

Keywords


Almond oil; Chemical quality parameters; Oil recovery; Screw-press extraction; Walnut oil

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