Table 1.

Summary of some nanomaterials studied to date for DNA damage in commonly used in vitro and in vivo genotoxicity test systems. Black dot presents positive genotoxic results while the empty circles indicate negative results.

Nanoparticles	Ames test	Chromosomal aberrations	Micronucleus assay	Comet assay	In vivo genotoxicity
SWCNT	○	●	●	●	●
MWCNT	○	○	●	●	●
TiO2	○	○	●	●	○
ZnO	○	●	○	●	○
Silver	○	●	●	●	●
Silica	○	●	●	●	●
Aluminium oxide	○	●	●	●	●
Iron oxide NPs	○	●	●	●	●