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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) HPLC spectrum of a representative diclofenac sodium calibration standard: concentration 100 μg/mL and fitting parameters of the respective calibration curve; (B) HPLC spectrum of a representative sample analysis during release experiments.