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Selection of specific inhibitor peptides in enzyme-linked immunosorbent assay (ELISA) of cardiac troponin I using immuno-dominant epitopes as competitor.
Human cardiac troponin I (cTni) is the gold marker for early diagnosis of myocardial infarction. In this regard, four immune-dominant epitopes of cTni were predicted and their 3D structures were determined. Thereafter, the competitive performance of the peptides was monitored with the developed polyclonal antibody-based indirect competitive ELISA; a half-maximal inhibitory concentration (IC50) of 0.49 (µg/mL) and detection limit of 0.037 (µg/mL) were achieved for recombinant cTni. The competitive ELISA determined sensitivity levels of 0.306, 0.141, 0.960, and 0.155 (µg/mL), respectively, for each peptide as competitor. We indicated that two of the selected epitopes have significant sensitivity scales and inhibition ability.
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