Development of glucose detection system using direct oxidation
N-doped DLC shows a wide potential window because, at N-doped DLC, oxygen and hydrogen evolution reactions in the process of
water electrolysis occur in higher potential region. This wide potential
window originates from the lower bonding strengrh
between adsorbed hydroxyl radical and electrode surfaces. Thus,
absorbed hydroxyl radical formed on DLC can be used as hydroxyl radical.
When glucose is introduced in flow injection analysis system that
conductive a-c electrodes are mounted on electrochemical detector
and a potential of 3 V is applied on N-doped a-C, amperometric current
resulted from glucose oxidation is observed.
The current value is proportional to glucose concentration. (Detection
limit is 1.37 mM.)
Hydroxyl radical formed on the electrode surface decomposes glucose
oxidatively.
That makes detections possible with direct oxidation current of reaction
products.
Therefore, analytical system that can detect glucose high sensitively
is achievable with a simple method, just apply potentials to conductive
DLC,
without using glucose oxidase.
1) JP,5360907,B
[Japanese Patent Publication No.] JP 2011 - 185910A (P2011-185910A)
[Japanese Patent Application No.] 2010-54751 (P2010-54751)
[Inventor] Kensuke Honda
[Title of the invention] The electrochemical detection of organic compounds for detection electrodes
and organic compound concentration using the same
[Applicant] Yamaguchi University
[Date of filing] 11, March, 2010
