Generation of hydrogen peroxide and hydroxyl radical resulting from oxygen-dependent oxidation of <scp>l</scp>-ascorbic acid via copper redox-catalyzed reactions
作者:Peng Zhou、Jing Zhang、Yongli Zhang、Ya Liu、Juan Liang、Bei Liu、Wei Zhang
DOI:10.1039/c6ra02843h
日期:——
degradation of BA. Dehydroascorbic acid, 2,3-diketogulonic acid, and L-xylosone were the predominant detected products of the oxidation of L-AA. However, the generation of H2O2 and degradation of BA were regulated by variations in pH, which results from the contradiction between protonated L-AA that is difficult to chelate with Cu(II) via electron transfer and hydrogen ions (H+), which are indispensable
过氧化氢(H的生成2 Ô 2的氧化过程中)和羟基自由基(HO)大号抗坏血酸(大号-AA)通过氧与铜作为催化剂进行了研究,以建立将O 2 /铜/大号-AA工艺,使用苯甲酸(BA)作为探针试剂。产生的高浓度H 2 O 2经历了分子内的两电子转移,并进一步被中间的亚铜[Cu(I)]活化,生成HO 3作为产物,导致BA的显着降解。脱氢抗坏血酸,2,3-二酮古洛糖酸和L-木酮是L -AA氧化的主要检测产物。然而,H 2 O 2的产生和BA的降解受pH值的调节,这是由于质子化的L -AA难以通过电子转移与Cu(II)螯合而与氢离子(H +)之间存在矛盾。,这对于生成H 2 O 2是必不可少的。此外,H 2 O 2的浓度和BA的降解随着L -AA剂量的增加而增加。痕量Cu(II)可有效催化L -AA的氧化,而H 2 O 2的生成和BA的降解随Cu(II)剂量的增加而增加。由于铜(形成我)氯化物络合物或C