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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Response surface plots for extracted phenolic compounds (mg GAE g−1) in (a) olive pomace and (b) lees filters by UAE as a function of ethanol (%) and HCl (%) concentration.