Three water-soluble β-alanine C 60 adducts with different addition numbers, C 60(NHCH 2CH 2COONa) nH n(n=1,5,9), were synthesized. The products were characterized by FTIR, 1H NMR and elemental analysis. The antioxida...Three water-soluble β-alanine C 60 adducts with different addition numbers, C 60(NHCH 2CH 2COONa) nH n(n=1,5,9), were synthesized. The products were characterized by FTIR, 1H NMR and elemental analysis. The antioxidant activity of these C 60 adducts as the quencher for superoxide anion radical O -· 2 was evaluated by chemiluminescence in the system of pyrogallol-luminol. The results indicate that the three C 60 derivatives are all excellent quencher for superoxide anion radical O -· 2. The concentrations of 50% inhibition are 252, 140, 112 μmol/L respectively. This high efficiency should be attributed to many factors such as the numbers of remaining double bonds, donor effect of amino group and steric effect. However, the above results also suggest the effect of the adducted β-alanine groups is predominated in this system.展开更多
The synthesis of a novel α phosphorus containing spin trap, DEPDMPO(5 diethoxy Phosphoryl 2, 5 dimethyl 1 pyrroline \%N\% oxide) and the evaluation of its ability to spin trap the hydroxyl and the superoxide anion ra...The synthesis of a novel α phosphorus containing spin trap, DEPDMPO(5 diethoxy Phosphoryl 2, 5 dimethyl 1 pyrroline \%N\% oxide) and the evaluation of its ability to spin trap the hydroxyl and the superoxide anion radicals were described in the present article. The ability to trap an active superoxide anion radical generated in the photo system Ⅱ(PSII) and the stability of their spin adduct of DEPDMPO as well as three previously reported traps DMPO, DEPMPO and M 3PO were comparatively analyzed according to their chemical structures. In addition, the effects of 2 methyl and \%α\% phosphoryl substituted analogues of DMPO on the stabilities of the corresponding spin adduts were systematically展开更多
文摘Three water-soluble β-alanine C 60 adducts with different addition numbers, C 60(NHCH 2CH 2COONa) nH n(n=1,5,9), were synthesized. The products were characterized by FTIR, 1H NMR and elemental analysis. The antioxidant activity of these C 60 adducts as the quencher for superoxide anion radical O -· 2 was evaluated by chemiluminescence in the system of pyrogallol-luminol. The results indicate that the three C 60 derivatives are all excellent quencher for superoxide anion radical O -· 2. The concentrations of 50% inhibition are 252, 140, 112 μmol/L respectively. This high efficiency should be attributed to many factors such as the numbers of remaining double bonds, donor effect of amino group and steric effect. However, the above results also suggest the effect of the adducted β-alanine groups is predominated in this system.
文摘The synthesis of a novel α phosphorus containing spin trap, DEPDMPO(5 diethoxy Phosphoryl 2, 5 dimethyl 1 pyrroline \%N\% oxide) and the evaluation of its ability to spin trap the hydroxyl and the superoxide anion radicals were described in the present article. The ability to trap an active superoxide anion radical generated in the photo system Ⅱ(PSII) and the stability of their spin adduct of DEPDMPO as well as three previously reported traps DMPO, DEPMPO and M 3PO were comparatively analyzed according to their chemical structures. In addition, the effects of 2 methyl and \%α\% phosphoryl substituted analogues of DMPO on the stabilities of the corresponding spin adduts were systematically
