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. 2019 Mar 19;11(3):131. doi: 10.3390/pharmaceutics11030131

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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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Isoresponse curves (graph floor) and response surface plots of relative size distribution (µm), respectively: (a) d(10), (b) d(50), (c) d(90) and (d) span, for formula optimization. % QSB—% Quercus Suber Bark particles.

Isoresponse curves (graph floor) and response surface plots of relative size distribution (µm), respectively: (a) d(10), (b) d(50), (c) d(90) and (d) span, for formula optimization. % QSB—% Quercus Suber Bark particles.