摘要
在文Ⅰ、Ⅱ中报道了叶绿素（Ｃｈｌ）的一种电化学分析方法，讨论了叶绿素ａ，ｂ电还原的机理以及去镁叶绿素（ｐｈｅｏｐｈｙｔｉｎ）和它的一种金属叶绿素（ＭＣｈｌ）ＣｕＣｈｌ的伏安特性。本文报道锌－去镁叶绿素（ＺｎＣｈｌ或ＺｎＰｈｅｏ）的伏安行为，并与ＣｕＣｈｌ的行为相比较，用以观察植物生长必需的另一重要微量元素锌在置换叶绿素中镁离子后的电化学氧化－还原性能，并指出它们的异同。
Themagnesium ion in chlorophyll(Chl )can be displaced by Zinc ion to form Zn-Chl. Since the porphyrin ring part of Chl is hydrophillic and the phytol chain part of Chl is hydrophobic, so the electro-reduction behavior of Zn-Chl is somewhat similar to the watersoluble Zn-TPPS, but not exact1y the same.The voltammetricbehaviors of Zn-ChlaandCu-Chlaaredifferent,the former is reduced with 2e￣-,while the latter with 4e￣-. The reduction product of Zn-Chla may be in the form of ZnChla·2H,which can be observed at high scan rate above l.5V/s. By the method of kinetic analysis,the surface reaction constant of the product,k￣o,has been foundtobe8.1s￣(-1).
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1995年第2期212-217,共6页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金
