Metohuayo Oil (Caryodendron orinocense Karst) Obtained by Hydraulic Pressing and Expeller: Yield Analysis and Physical-chemical Characteristics

• Autores: DELGADO SORIANO, VICTOR DANIEL, Delgado-Soriano, Víctor, Espinoza, Yessy, Torre, Rubén, Encina-Zelada, Christian R.
• Formato: artículo
• Fecha de Publicación: 2022
• Institución: Universidad Nacional del Altiplano
• Repositorio: Revista de Investigaciones Altoandinas
• Lenguaje: español
• OAI Identifier: oai:ojs.pkp.sfu.ca:article/446
• Nivel de acceso: acceso abierto
• Materia: Oilseeds, green technology, underutilized, principal component analysis (PCA), mountain peanut.; Semillas oleaginosas, tecnología verde, subutilizado, análisis de componentes principales (PCA), maní del monte.

The main objective of the research was to obtain metohuayo oil by hydraulic pressing versus screw pressing (at 50, 70 and 90 °C). The variables evaluated on the extracted oil were: extraction yield and physical-chemical. The seed stood out for its high fat content (40.5 %) and color L* (29.3), a* (9.7) and b* (18.4). Screw pressing at 50 °C presented the maximum yield and oil recovery values: 39.2% and 96.9%, respectively. The same trend was observed for the quality parameters analyzed: acidity index, peroxide index, p-anisidine index and coefficients K232 and K268, where their values showed an increase related with temperature levels of the screw pressing. The results showed that the set of physical-chemical characteristics allow the recognition and differentiation of the oils obtained in relation to temperature levels, and through a Principal Component Analysis (PCA) it was possible to infer that this type of results can be used as a recognition tool in this process to distinguish the effect of extraction methods. Finally, the oils obtained by both methods, although they showed statistical differences (p<0.05) in their physical-chemical characteristics, showed values within the ranges established by the Codex Alimentarius. These results propose the extraction of oil by screw pressing as a technological process that improves, compared to hydraulic pressing, the use of metohuayo seed oil produced in the tropical Andes, in accordance with the new market demands.