Biomaterial Database

Re-evaluation of silicon dioxide (E 551) as a food additive. 2018

, and Maged Younes, and Peter Aggett, and Fernando Aguilar, and Riccardo Crebelli, and Birgit Dusemund, and Metka Filipič, and Maria Jose Frutos, and Pierre Galtier, and David Gott, and Ursula Gundert-Remy, and Gunter Georg Kuhnle, and Jean-Charles Leblanc, and Inger Therese Lillegaard, and Peter Moldeus, and Alicja Mortensen, and Agneta Oskarsson, and Ivan Stankovic, and Ine Waalkens-Berendsen, and Rudolf Antonius Woutersen, and Matthew Wright, and Polly Boon, and Dimitrios Chrysafidis, and Rainer Gürtler, and Pasquale Mosesso, and Dominique Parent-Massin, and Paul Tobback, and Natalia Kovalkovicova, and Ana Maria Rincon, and Alexandra Tard, and Claude Lambré

The EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS) provides a scientific opinion re-evaluating the safety of silicon dioxide (E 551) when used as a food additive. The forms of synthetic amorphous silica (SAS) used as E 551 include fumed silica and hydrated silica (precipitated silica, silica gel and hydrous silica). The Scientific Committee on Food (SCF) established a group acceptable daily intake (ADI) 'not specified' for silicon dioxide and silicates. SAS materials used in the available biological and toxicological studies were different in their physicochemical properties; their characteristics were not always described in sufficient detail. Silicon dioxide appears to be poorly absorbed. However, silicon-containing material (in some cases presumed to be silicon dioxide) was found in some tissues. Despite the limitations in the subchronic, reproductive and developmental toxicological studies, including studies with nano silicon dioxide, there was no indication of adverse effects. E 551 does not raise a concern with respect to genotoxicity. In the absence of a long-term study with nano silicon dioxide, the Panel could not extrapolate the results from the available chronic study with a material, which does not cover the full-size range of the nanoparticles that could be present in the food additive E 551, to a material complying with the current specifications for E 551. These specifications do not exclude the presence of nanoparticles. The highest exposure estimates were at least one order of magnitude lower than the no observed adverse effect levels (NOAELs) identified (the highest doses tested). The Panel concluded that the EU specifications are insufficient to adequately characterise the food additive E 551. Clear characterisation of particle size distribution is required. Based on the available database, there was no indication for toxicity of E 551 at the reported uses and use levels. Because of the limitations in the available database, the Panel was unable to confirm the current ADI 'not specified'. The Panel recommended some modifications of the EU specifications for E 551.