Ultrasensitive and label-free biosensor for the detection of Plasmodium falciparum histidine-rich protein II in saliva

Gita V. Soraya, Chathurika D. Abeyrathne, Christelle Buffet, Duc H. Huynh, Shah Mukim Uddin, Jianxiong Chan, Efstratios Skafidas, Patrick Kwan, Stephen J. Rogerson

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Malaria elimination is a global public health priority. To fulfil the demands of elimination diagnostics, we have developed an interdigitated electrode sensor platform targeting the Plasmodium falciparum Histidine Rich Protein 2 (PfHRP2) protein in saliva samples. A protocol for frequency-specific PfHRP2 detection in phosphate buffered saline was developed, yielding a sensitivity of 2.5 pg/mL based on change in impedance magnitude of the sensor. This protocol was adapted and optimized for use in saliva with a sensitivity of 25 pg/mL based on change in resistance. Further validation demonstrated detection in saliva spiked with PfHRP2 from clinical isolates in 8 of 11 samples. With a turnaround time of ~2 hours, the label-free platform based on impedance sensors has the potential for miniaturization into a point-of-care diagnostic device for malaria elimination.

Original languageEnglish
Article number17495
Number of pages10
JournalScientific Reports
Issue number1
Publication statusPublished - 1 Dec 2019

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