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. 2018 Jun 1;16:51. doi: 10.1186/s12951-018-0376-8

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Example of food-grade TiO₂ particles (E 171). a A sample of food-grade anatase dispersed in H₂O was deposited on a copper grid coated with glow-discharged parlodion and analyzed by TEM as described [146, 147]. Scale bar, 100 nm. b Size distribution of the imaged food-grade TiO₂ particles. The diameter measured as longest distance across particles is 100 ± 24 nm (mean ± standard deviation) and 54% by number of the particles have a diameter < 100 nm