Figure 5.

The influence of the free radical scavenger tris(hydroxymethyl)aminomethane on DNA plasmid-bound gold nanoparticle (GNP) radiosensitisation. Enhancement increases with concentration as more water radicals are scavenged. At concentrations >100 mM, enhancement falls as GNP-produced radicals are also scavenged. Reproduced with permission from Carter et al [57].