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Gold nanoparticles (AuNPs) modification shows great advantages in improving the antioxidant activity of nanoCeO2. However, the improved effect of AuNPs modification become smaller and even results the decrease of antioxidant ability due to the severe aggregation with the increase of nanomaterials' concentration. Additionally, the effects of photo-properties of AuNPs on the antioxidant activity of nanoCeO2 have not been studied. In response to these problems, a core-shell shaped Au@CeO2 was synthesized which took Au nanorods (AuNRs) as carriers and with a layer of CeO2 nanoparticles (NPs) coating. The antioxidant activity of Au@CeO2 was evaluated by UV-vis method in MV-Fenton system. Results showed that AuNRs could improve the antioxidant activity of nanoCeO2 due to the increase of Ce3+ amount on the surface of nanoCeO2, and the enhancing effect was remained across the whole experimental concentration range due to the good dispersibility of AuNRs. Additionally, a further increase of the antioxidant ability of Au@CeO2 has been found with 5 min visible light irradiation, and continuous irradiation during a 25 min time reaction resulted in more obvious enhanced antioxidant ability. This phenomenon was attributed to the localized surface plasmon resonance (LSPR) of AuNRs triggered by photons which induced charge transfer from AuNRs to nanoCeO2, thus making the recycle become easier between Ce3+ and Ce4+.
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A natural tocopherol with less antioxidant activity than alpha-tocopherol. It exhibits antioxidant activity by virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus. As in GAMMA-TOCOPHEROL, it also has three methyl groups on the 6-chromanol nucleus but at different sites.
A natural tocopherol with less antioxidant activity than ALPHA-TOCOPHEROL. It exhibits antioxidant activity by virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus. As in BETA-TOCOPHEROL, it also has three methyl groups on the 6-chromanol nucleus but at different sites.
A natural tocopherol and one of the most potent antioxidant tocopherols. It exhibits antioxidant activity by virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus. It has four methyl groups on the 6-chromanol nucleus. The natural d form of alpha-tocopherol is more active than its synthetic dl-alpha-tocopherol racemic mixture.
A generic descriptor for all TOCOPHEROLS and TOCOTRIENOLS that exhibit ALPHA-TOCOPHEROL activity. By virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus, these compounds exhibit varying degree of antioxidant activity, depending on the site and number of methyl groups and the type of ISOPRENOIDS.
A benzodiazepine with anticonvulsant, anxiolytic, sedative, muscle relaxant, and amnesic properties and a long duration of action. Its actions are mediated by enhancement of GAMMA-AMINOBUTYRIC ACID activity.