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Abstract
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Cardiac troponin I (cTnI) is a specific biomarker of myocardial damage. Several techniques have been
reported for cTnI detection, which is based on immunoaffinity, aptamers, and molecular imprinting
polymers. Using computational methods, we introduced a novel chemical receptor for cTnI, named
tetrabromophenol blue (TBPB), which interacted with cTnI selectivity in the presence of human serum
albumin (HSA), cardiac troponin C (cTnC) and C reactive protein (CRP). Employing TBPB as a chemical
receptor, a novel electrochemical sensor was constructed for the electrochemical sensing of cTnI. A glassy
carbon electrode surface was modified with layered double hydroxide nanostructures (LDHNS) and TBPB.
The modified electrode showed electrocatalytic activity toward ascorbic acid (AA) in a phosphate buffer
solution (pH 7.4). The results revealed that using AA as a signal enhancer for cTnI detection could be a
good idea. The linear range (50.00e3.50 105 pM) and detection limit (2.77 pM) were calculated using
differential pulse voltammetry to measure cTnI at the TBPB/meso-Fe/CoLDHNS/GCE in a pH 7.40 buffer
solution containing 1 mM of AA. Firstly, based on our docking studies, TBPB showed a very low tendency
towards HSA, cTnC, and CRP. Additionally, the selectivity of TBPB/meso-Fe/CoLDHNS/GCE for cTnI was
studied electrochemically in the presence of HSA, cTnC, and CRP.
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