Simple and free-labeled voltammetry determination of glioma cell

Glioma is one of the most frequent brain tumors with substantial mortality and morbidity, thus designing a simple sensor for achieving highly efficient determination of glioma cell is of great importance. In this work, by preparing 3,4,9,10-perylene tetracarboxylic acid (PTCA) non-covalently functionalized carbon black (CB) nanohybrids (CB-PTCA) as matrix and using angiopep-2 peptide (Ang-2) as receptor to recognize selectively glioma cell, a simple and free-labeled voltammetry sensor was developed for the first time to detect glioma cell by using Ang-2 and CB-PTCA modified glassy carbon electrode (Ang-2/CB/GCE): via introducing typical [Fe(CN)₆]^4-/3- as the signal probe, its electrochemical signal would be suppressed when glioma cells were recognized by Ang-2, and the values of peak current difference varied along with the concentrations of glioma cells. After optimizing the related testing conditions (the amounts of CB-PTCA, concentration of Ang-2 and recognition time of Ang-2 towards glioma cells), a wide linearity from 10² to 10⁶ cells mL^-1 and a low analytic limitation of 30 cells mL^-1 were achieved for glioma cell. Furthermore, the application of the proposed immunosensor in human serum was also studied, revealing that the results are reliable and the designed proposal offers a significant clinical application for glioma detection.