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. 2023 Jul 25;28(15):5633. doi: 10.3390/molecules28155633

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© 2023 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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Figure A1 — Stationary spectra of alizarin red S and alizarin in DMSO with different concentrations of toluenesulfonic acid (TosOH) and Diazabicycloundecene (DBU), respectively. Path length 1 mm, c(ARS/Alizarin) = 0.9 mM.