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. 2020 Jan 16;12(1):70. doi: 10.3390/pharmaceutics12010070

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© 2020 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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Field emission scanning electron microscopy (FE-SEM) at different stages. (A) Synthesized HAPs, (B) HAPs functionalized with phosphonate, (C) Pip loading, (D) GA coating, and (E) FA conjugation.