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. 2020 Oct 28;11:582390. doi: 10.3389/fphar.2020.582390

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Copyright © 2020 Wang, Cheng, Zhang, Wu, Wu, Cao, Wu and Zhou.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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UV-Visible absorption spectra of six compounds coordinated with different concentrations of Cu²⁺. (A) chrysophanol; (B) emodin; (C) rhein; (D) curcumin; (E) quercetin; (F) kaempferide.