In a bioelechemical process in which the electrons are transferred directly, without use of a mediator, such as a redox dye or cofactor, between an electrode and an electroactive biological material, such as an enzyme or a protein, in either direction, rapid electron transfer has previously been achieved between an electrode and the positively charged protein horse-heart cytochrome c by adding a surface-modifier such as 4,4'-bipyridyl or a derivative thereof.
It has now been found possible to promote electron transfer to either a positively or a negatively charged protein using the same surface-modifier for either job, namely a compound of formula
wherein: The puridine ring shown in substituted in the 2-,
3- or 4-position by the (methylene)hydrazinecar- bothioamide group shown;
R' represents hydrogen atom(s) or one or two methyl or ethyl groups in the 2-, 3- or 4-position (when the said position is not substituted by the (methylene)hydrazinecar- bothioamide group shown);
R2 represents a hydrogen atom or a methyl group;
R3 represents a hydrogen atom or a methyl group; and
R4 represents a hydrogen atom or a methyl group.
在
生物电
化学过程中,电子在电极和具有电活性的
生物材料(如酶或蛋白质)之间直接转移,而不使用氧化
还原染料或辅助因子等媒介物,以前,通过添加表面改性剂(如
4,4'-联吡啶或其衍
生物),可实现电极和带正电的蛋白质马心细胞色素 c 之间的快速电子转移。
现在,我们发现可以使用相同的表面改性剂来促进电子转移到带正电荷或带负电荷的蛋白质上,即一种式化合物
其中所示的
嘌呤环在 2-、
所示的
嘌呤环在 2-、3-或 4-位被所示的(亚甲基)
肼car- bothioamide 基团取代;
R'代表氢原子或 2-、3-或 4-位上的一个或两个甲基或乙基(当所述位 置未被所示(亚甲基)
肼基双
硫代酰胺基团取代时);
R2 代表氢原子或甲基;
R3 代表氢原子或甲基;以及
R4 代表氢原子或甲基。