Renewable electrochemical sensor for PARP-1 activity detection based on host-guest recognition
Abstract
Poly (ADP-ribose) polymerase-1 (PARP-1) was defined as a new biomarker, which has achieved wide attention in recent years. In this work, we designed a renewable electrochemical sensor based on host-guest recognition for the detection of PARP-1 activity. Mono-(6-Mercapto-6-deoxy)-beta-Cyclodextrin (SH-β-CD) was modified on the electrode surface to recognize the trans-azobenzene labeled dsDNA (Abz-dsDNA). In the presence of PARP-1, PAR with abundant PO43- was generated and reacted with MoO42- to form PMo12O403-, producing strong current. The proposed method avoided the unspecific adsorption effectively and improved the detection accuracy. Under UV irradiation, Abz-dsDNA was removed from the electrode surface because of the configuration change of azobenzene from trans to cis structure, allowing the electrode to be recycled. The sensor realized the linear detection of PARP-1, ranging from 0.01 U to 1.0 U with a detection limit of 0.008 U, which is comparable to results from reported methods. It is expected to be a potential tool for clinical detection because of its high sensitivity and selectivity.
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