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. 2021 Jan 16;13(1):111. doi: 10.3390/pharmaceutics13010111

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© 2021 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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Photodegradation profile of MTX formulations. Each MTX sample was exposed to UV light (250 W/m²) for the indicated periods, and its purity was assessed by HPLC.