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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-UV chromatograms of eye drops with CS (2%) and HA (0.4%) from a chromatographic purity test: (A) after exposure to light (minims, 250 W/m²; 1.2 × 10⁶ lux·h); (B) stored in bottles under controlled conditions (40 °C/75% RH); (C) stored in minims under controlled conditions (40 °C/75% RH); (D) stored in bottles under controlled conditions (25 °C/60% RH); (E) stored in minims under controlled conditions (25 °C/60% RH); (F) stored in minims under uncontrolled conditions (2–8 °C).