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. 2019 Apr 1;24(7):1269. doi: 10.3390/molecules24071269

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© 2019 by the authors.

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/).

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Contour plots for key process parameter effects on the ${S A B}_{y i e l d .}^{S}$ (a) Extraction pH and extraction temperature effect on the ${S A B}_{y i e l d}^{S}$ when back-extraction pH = 4.5, (b) back-extraction pH and extraction temperature effect on the ${S A B}_{y i e l d}^{S}$ when extraction pH = 3.3, (c) back-extraction pH and extraction pH effect on the ${S A B}_{y i e l d}^{S}$ when extraction temperature = 75.0 °C.