GENERATION OF PHOTOCURRENTS BY A CHLOROPLAST PHOTOSYSTEM-I SUBMEMBRANE FRACTION USING THE MEHLER REACTION

被引：2

作者：

BOUCHER, N ^{[1
]}

CARPENTIER, R ^{[1
]}

机构：

[1] UNIV QUEBEC,CTR RECH & PHOTOBIOPHYS,CP 500,TROIS RIVIERES GA9 5H7,QUEBEC,CANADA

来源：

ELECTROCHIMICA ACTA | 1992年 / 37卷 / 14期

关键词：

ELECTRON TRANSPORT; OXYGEN UPTAKE; ELECTROCHEMISTRY; DUROQUINONE; OXYGEN RADICALS;

D O I：

10.1016/0013-4686(92)87055-5

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A photosystem I submembrane fraction isolated from spinach leaves is used to generate photocurrents under potentiostatic conditions in a small (80 mul) one compartment electrochemical cell. The photocurrent was generated via a Mehler-type reaction pathway where superoxide radicals are formed during the reduction of dissolved oxygen by photosystem I. The superoxide ions dismutate to hydrogen peroxide which reacts with a platinum working electrode. In the presence of the electron donor durohydroquinone, the photosystem generated relatively strong photocurrents under various conditions. The results demonstrate the suitability of the photoelectrochemical cell to study pseudocyclic electron transport with isolated photosystem I submembrane fraction instead of whole thylakoid membranes.

引用

页码：2581 / 2585

页数：5

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