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. 2021 Aug 26;14(9):849. doi: 10.3390/ph14090849

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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 (https://creativecommons.org/licenses/by/4.0/).

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HPLC-MS/MS chromatograms of eye drops with CS (2%) and HA (0.4%) in immediate packaging (minims) after 3 months of storage at 40 °C/75% RH. The inset shows the HPLC-MS/MS chromatogram of eye drops in minims after exposure to light (250 W/m²; 1.2 × 10⁶ lux·h): 1—2,5-dihydroxybenzoic acid; 2—2,3-dihydroxybenzoic acid.