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. 2019 Jun 27;45:261–277. doi: 10.1016/j.ebiom.2019.06.026

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© 2019 The Authors. Published by Elsevier B.V.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 2 — The pH-responsive release of Fe²⁺ from the surface coated ATA-IONPs.

(a) Quantitative analysis of the Fe²⁺ released from ATA-IONPs at different pH environments, (data represents the mean ± standard error of the mean of three independent experiments) and (b) the corresponding representative TEM images of ATA-IONPs in 1xPBS buffer at different pH values 7.4, 6.0, and 5.0. The diameter of the ATA-IONPs was estimated from 50 particles each which are free from the aggregated state. Data represent the mean ± standard error of the diameter of 50 particles each. (c) Hydrodynamic size of NPs at respective pH.