Scavenging ability of dendritic PAMAM bridged hindered phenolic antioxidants towards DPPH˙ and ROO˙ free radicals

Abstract

Antioxidant activities of first generation and the second generation dendritic antioxidants (1.0G and 2.0G dendritic antioxidants) with a hindered phenolic group and a tertiary amine group at the same molecule were evaluated using the DPPH˙ method and the oxygen uptake method. It was found that two dendritic antioxidants had good scavenging abilities on DPPH˙ and ROO˙ free radicals and their scavenging abilities were superior to Irganox 3114 with only hindered phenol groups. The antioxidant abilities of dendritic skeletons which only contained the tertiary amine groups were evaluated and they might scavenge DPPH˙ and ROO˙ free radical. The results of dendritic skeletons showed that dendritic antioxidants were the intramolecular complex primary antioxidants with hindered phenolic group and tertiary amine group, and they have good synergistic effect.