Abstract
A new zeolite-iron oxide nanocomposite (ZEO-IO) was extracted from waste fly ash of a thermal power plant and utilized for capturing aptamers used to quantify the myocardial infarction (MI) biomarker N-terminal prohormone B-type natriuretic peptide (NT-ProBNP); this was used in a probe with an integrated microelectrode sensor. High-resolution microscopy revealed that ZEO-IO displayed a clubbell structure and a particle size range of 100–200 nm. Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy confirmed the presence of Si, Al, Fe, and O in the synthesized ZEO-IO. The limit of detection for NT-ProBNP was 1–2 pg/mL (0.1–0.2 pM) when the aptamer was sandwiched with antibody and showed the doubled current response even at a low NT-ProBNP abundance. A dose-dependent interaction was identified for this sandwich with a linear plot in the concentration range 1 to 32 pg/mL (0.1–3.2 pM) with a determination coefficient R2 = 0.9884; y = 0.8425x–0.5771. Without sandwich, the detection limit was 2–4 pg/mL (0.2–0.4 pM) and the determination coefficient was R2 = 0.9854; y = 1.0996x–1.4729. Stability and nonfouling assays in the presence of bovine serum albumin, cardiac troponin I, and myoglobin revealed that the aptamer-modified surface is stable and specific for NT-Pro-BNP. Moreover, NT-ProBNP-spiked human serum exhibited selective detection. This new nanocomposite-modified surface helps in detecting NT-Pro-BNP and diagnosing MI at stages of low expression.
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Liu, Z., Gopinath, S.C.B., Wang, Z. et al. Zeolite-iron oxide nanocomposite from fly ash formed a ‘clubbell’ structure: integration of cardiac biocapture macromolecules in serum on microelectrodes. Microchim Acta 188, 187 (2021). https://doi.org/10.1007/s00604-021-04834-w
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DOI: https://doi.org/10.1007/s00604-021-04834-w