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. 2021 Apr 1;11:7347. doi: 10.1038/s41598-021-86762-6

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Characterization of PTXNRs: (a) Scanning electron microscopy (SEM) image of PTXNRs. (b) Particle size: Percentile plots of the PTXNR-TTZ particle length and diameter were analyzed using ImageJ/ Fiji software. (c) Size distribution of PTXNR particle length. (d) Size distribution of PTXNR particle diameter as calculated analyzing SEM images. The number ‘n’ denotes the particle population count for the analysis; and (e) Zeta potential (ξ) of PTXNR is -32.6 ± 4.8 mV in water. Three colors indicate three different experiments.