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. 2017 Apr 7;9(4):135. doi: 10.3390/polym9040135

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© 2017 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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(a) The chemical structures of hypericin, protohypericin, and emodin; (b) Selective bindings of Fe₃O₄@PDA/Hyp (black) and Fe₃O₄@PDA (red) NSs toward to hypericin, protohypericin, and emodin, respectively.