Obtaining Phenolic-Enriched Liquid Fractions and Compostable Pomace for Agriculture from Alperujo Using Standard Two-Phase Olive Oil Mill Equipment

Manuel Rodríguez Márquez, Guillermo Rodríguez Gutiérrez (), Marianela Giménez, Pedro Federico Rizzo, Luis Bueno, Cristina Deiana and Pablo Monetta ()
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Manuel Rodríguez Márquez: Instituto Nacional de Tecnología Agropecuaria (INTA), EEA San Juan, Calle 11 S/N, Pocito 5427, San Juan, Argentina
Guillermo Rodríguez Gutiérrez: Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario Pablo de Olavide, Edificio 46, Ctra. de Utrera, km 1, 41013 Sevilla, Spain
Marianela Giménez: Instituto de Ingeniería Química, Facultad de Ingeniería, Universidad Nacional de San Juan (UNSJ), Av. Libertador Gral. San Martín 1109, San Juan 5400, San Juan, Argentina
Pedro Federico Rizzo: Instituto Nacional de Tecnología Agropecuaria (INTA), EEA Mendoza, San Martín 3853, Luján de Cuyo 5507, Mendoza, Argentina
Luis Bueno: Instituto Nacional de Tecnología Agropecuaria (INTA), EEA San Juan, Calle 11 S/N, Pocito 5427, San Juan, Argentina
Cristina Deiana: Instituto de Ingeniería Química, Facultad de Ingeniería, Universidad Nacional de San Juan (UNSJ), Av. Libertador Gral. San Martín 1109, San Juan 5400, San Juan, Argentina
Pablo Monetta: Instituto Nacional de Tecnología Agropecuaria (INTA), EEA San Juan, Calle 11 S/N, Pocito 5427, San Juan, Argentina

Agriculture, 2024, vol. 14, issue 8, 1-12

Abstract: Olive oil extraction by two-phase systems generates a by-product called “alperujo” which presents several difficulties for its valorization. The present work evaluated an industrial approach, based on the application of thermal treatments to alperujo followed by solid/liquid separation using standard two-phase olive oil mill equipment. Treatments consisted of the thermo-malaxation of alperujo at 70 °C for 45 or 90 min, with or without acid addition, followed by solid/liquid separation in an industrial decanter. The solid was characterized concerning subsequent use for composting, while total and hydrophilic phenolics were analyzed in liquid for their recovery. Additionally, a laboratory-scale trial to compare phenolic purification by ethylic acetate extraction with chromatographic procedures was also included. The static respiration index showed that solid fractions presented higher susceptibility to biodegradation processes than raw alperujo. The phenolic content of treated liquid fractions was higher than in raw alperujo. Total phenolics were maximum at the longest exposure time without acid addition, while hydrophilic phenolics were highest at the shortest exposure time in acidified samples. The use of non-ionic resins seemed attractive for obtaining highly concentrated phenolic fractions. The proposed thermal treatments can be applied in olive oil industries, allowing in situ pomace valorization and the recovery of phenolic-enriched liquid fractions.

Keywords: hydroxytyrosol; by-products; olive oil; alperujo; phenolics; bioactive compounds (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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