Fig. 1
From: Critical review of the safety assessment of titanium dioxide additives in food
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