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. 2019 Feb 6;10:142. doi: 10.3389/fmicb.2019.00142

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Copyright © 2019 Hong, Kim, Lee, Kang, Choi and Cho.

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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Characteristics of PPNs. Calculation of mol.-% phthalic acid in PPNs by ¹H-NMR spectroscopy (A). Measurement of the zeta potential of PPNs by ELS (B) and size by DLS (C). Morphologies of PPNs observed by SEM (D). Magnification: 100,00K, scale bar = 100 nm. (PPNs: phthalyl pullulan nanoparticles, H-NMR: nuclear magnetic resonance, ELS: electrophoretic light scattering, DLS: dynamic light scattering, SEM: scanning electron microscope).