DNA
Hydrogel-Based Three-Dimensional Electron Transporter
and Its Application in Electrochemical Biosensing
Posted on 2020-07-27 - 20:29
Electrochemical
biosensing relies on electron transport on the
electrode surface. However, the limited functional area of the two-dimensional
electrode prevents the qualitative breakthrough in the efficiency
of electron transfer. Here, a three-dimensional electron transporter
was constructed to improve the efficiency of electron transfer by
using an interface-immobilized DNA hydrogel. A three-dimensional pure
DNA hydrogel is constructed and used as a scaffold for electron transfer.
Then, an electron mediator is embedded in the DNA hydrogel through
intercalative binding, and DNAzyme with intrinsic peroxidase-like
activity is introduced at the node of the hydrogel scaffold to fabricate
an electrochemical biosensor. The conduction of the electron mediator
in the scaffold enables the acquisition of long-distance DNAzyme catalytic
signals, thereby overcoming the limitation of two-dimensional electrodes.
This three-dimensional electron transporter is significant for enriching
the toolbox of electrochemical biosensing and can provide potential
support for the development of highly sensitive biosensors.
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Mao, Xiaoxia; Mao, Dongsheng; Chen, Tianshu; Jalalah, Mohammed; Al-Assiri, Mohammed S.; Harraz, Farid A.; et al. (2020). DNA
Hydrogel-Based Three-Dimensional Electron Transporter
and Its Application in Electrochemical Biosensing. ACS Publications. Collection. https://doi.org/10.1021/acsami.0c08064