کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
867472 | 909783 | 2012 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Micro-coulometric study of bioelectrochemical reaction coupled with TCA cycle Micro-coulometric study of bioelectrochemical reaction coupled with TCA cycle](/preview/png/867472.png)
The mediated electro-enzymatic electrolysis systems based on the tricarboxylic acid (TCA) cycle reaction were examined on a micro-bulk electrolytic system. A series of the enzyme-catalyzed reactions in the TCA cycle was coupled with electrode reaction. Electrochemical oxidation of NADH was catalyzed by diaphorase with an aid of a redox mediator with a formal potential of −0.15 V vs. Ag|AgCl. The mediator was also able to shuttle electrons between succinate dehydrogenase and electrode. The charge during the electrolysis increased on each addition of dehydrogenase reaction in a cascade of the TCA cycle. However, the electrolysis efficiencies were close to or less than 90% because of the product inhibition. Lactate oxidation to acetyl-CoA catalyzed by two NAD-dependent dehydrogenases was coupled with the bioelectrochemical TCA cycle reaction to achieve the 12-electron oxidation of lactate to CO2. The charge passed in the bioelectrocatalytic oxidation of 5 nmol of lactate was 4 mC, which corresponds to 70% of the electrolysis efficiency.
► Complete oxidation of organic acids using TCA cycle.
► Effects of kinetics and thermodynamics on electrolysis efficiency.
► Quantitative analysis by a coulometry.
Journal: Biosensors and Bioelectronics - Volume 34, Issue 1, 15 April 2012, Pages 244–248