An aptasensor for electrochemical detection of tumor necrosis factor in human blood

Electrochemical aptasensors can detect disease markers such as cytokines to provide point-of-care diagnosis that is low-cost, rapid, specific and sensitive. Herein, we describe the development of an aptamer-based electrochemical sensor for detection and analysis of tumor necrosis factor-alpha (TNF-α)-a key inflammatory cytokine-in whole human blood. When testing spiked blood, a TNF-α detection limit of 58 pM (10 ng mL^-1) and a linear range of 6 nM (100 ng mL^-1) could be achieved. Furthermore, detection of TNF-α in mitogen stimulated whole blood was demonstrated.