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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/).
Three-dimensional plot for the obtained responses of (a) total phenols (TPH), (b) total flavonoids (TFL), and (c) antioxidant activity as a function of extraction temperature, time, and HCl concentration.