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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/).
(a) Standardized Pareto chart for NFD release due to hydrogel treatment (A, time; B, pH; C, γ-CD proportion; AB, BC, and AC, interactions; and the line represents the critical t-value, 95% confidence); and (b) estimated response surface.