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A novel electrochemical biosensor using molecularly imprinted polymers (MIPs) can detect the malaria marker histidine-rich protein (HRP2) at the point-of-care. This simple, cost-effective sensor offers accurate malaria diagnosis without redox probes.

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Area of Science:

  • Biomedical Engineering
  • Electrochemistry
  • Materials Science

Background:

  • Malaria remains a significant global health issue, necessitating improved diagnostic tools.
  • Traditional malaria diagnostics face limitations including ethical and economic concerns.
  • Molecularly imprinted polymers (MIPs) present a viable alternative for selective molecular recognition.

Purpose of the Study:

  • To develop a liquid, redox-probe-free, MIP-based electrochemical biosensor for detecting Plasmodium falciparum histidine-rich protein 2 (HRP2).
  • To enable point-of-care (PoC) malaria diagnosis with high sensitivity and selectivity.
  • To offer a simple, cost-effective, and reliable diagnostic method.

Main Methods:

  • Electropolymerization of methylene blue (MB) in the presence of HRP2 to create MIPs on a modified carbon screen-printed electrode (C-SPE).
  • Removal of HRP2 using proteinase K and oxalic acid to form specific binding sites.
  • Characterization using cyclic voltammetry (CV), Raman spectroscopy, and scanning electron microscopy (SEM).
  • Performance evaluation via square-wave voltammetry (SWV) in buffer and serum.

Main Results:

  • The developed MIP-based electrochemical biosensor demonstrated a low detection limit of 0.43 ± 0.026 pg mL⁻¹ for HRP2.
  • The sensor exhibited high selectivity with minimal interference from other substances.
  • The biosensor operates without the need for a redox probe, simplifying the detection process.

Conclusions:

  • The MIP-based electrochemical biosensor is a promising tool for simple, cost-effective, and reliable point-of-care detection of the malaria marker HRP2.
  • This innovative approach simplifies malaria diagnosis, addressing key limitations of traditional methods.
  • The sensor's electroactive polymer and high selectivity contribute to its diagnostic potential.