Choline chloride-based deep eutectic solvents as potential solvent for extraction of phenolic compounds from olive leaves: Extraction optimization and solvent characterization

Author(s)

de Almeida Pontes, Paula Virginia ^[1] ; Shiwaku, Isabella Ayumi ^[1] ; Maximo, Guilherme Jose ^[1] ; Caldas Batista, Eduardo Augusto ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Sch Food Engn, Dept Food Engn & Technol, Lab Extract Appl Thermodynam & Equilibrium, EXTRAE, BR-13083862 Campinas, SP - Brazil

• Document type: Journal article
• Source: Food Chemistry; v. 352, AUG 1 2021.
• Web of Science Citations: 0

Abstract

This study evaluates the use of deep eutectic solvents (DES) prepared with choline chloride ({[}Ch]Cl) and carboxylic acids for phenolic compound extraction from olive leaves. These extracts were then compared to those obtained using ethanol. The effects of temperature and water addition during DES- and ethanol-based extractions were analyzed using response surface methodology. Due to the lack of solid-liquid equilibrium (SLE) data for {[}Ch]Cl + acetic acid, SLE, and DES density and viscosity with and without water addition were measured and analyzed. {[}Ch]Cl:acetic acid (54.1 degrees C, 50.0% water addition) extracted 15% more phenolic compounds than ethanol (54.1 degrees C, 0.5% water addition), according to UHPLC-MS based analyses. SLE analyses showed that {[}Ch] Cl + acetic acid presented a eutectic region at close to a 1:2 molar ratio. DES precursors and water addition influenced solvent physical properties and phenolic compound yield. DES was confirmed to be an innovative, strong solvent for phenolic compound extraction from olive leaves. (AU)

• FAPESP's process: 14/21252-0 - Equilibrium and production processes of biofuels and bioproducts
• Grantee: Antonio José de Almeida Meirelles
• Support Opportunities: Research Projects - Thematic Grants