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Aptamer‐functionalized Ti 3 C 2 ‐MXene Nanosheets with One‐step Potentiometric Detection of Programmed Death‐ligand 1
Author(s) -
Li Bin,
Pu Wenyuan,
Weng Lingyan,
Lyu Peng,
Xu Houxi,
Zhang Wen,
Ge Lilin,
Kwok Hang Fai,
Wu Qinan
Publication year - 2022
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202100438
Subject(s) - aptamer , potentiometric titration , detection limit , analyte , electrode , linear range , ligand (biochemistry) , materials science , chemistry , combinatorial chemistry , analytical chemistry (journal) , chromatography , biochemistry , receptor , genetics , biology
This communication describes a simple sensitive one‐step potentiometric aptasensing method for quantitative detection of a referenced therapeutic biomarker (programmed death‐ligand 1, PD−L1). The aptasensor is constructed by modifying PD−L1‐specific aptamer on Ti 3 C 2 ‐MXene nanosheets‐functionalized electrode. Introduction of PD−L1 induces the specific reaction between PD−L1 and aptamer, thereby resulting in the change of spatial structures. The surface electric potential of modified electrode is shifted upon addition of PD−L1 proteins before and after the reaction of aptamer with the analyte. Interestingly, potentiometric aptamer with Ti 3 C 2 ‐MXene nanosheets can achieve a higher sensitivity and a lower detection limit toward target PD−L1 relative to aptamer‐modified electrode. Experimental results indicated that the linear range and detection limit of using Ti 3 C 2 ‐MXene nanosheets were 0.01–100 ng mL −1 and 7.8 pg mL −1 PD−L1, respectively. Meanwhile, the specificity, reproducibility, storing stability and accuracy of potentiometric aptasensor are acceptable for the screening of PD−L1 in human serum samples.