Hemozoin-catalyzed precipitation polymerization as an assay for malaria diagnosis

Omar Rifaie-Graham, Jonas Pollard, Samuel Raccio, Sandor Balog, Sebastian Rusch, María Andrea Hernández-Castañeda, Pierre-Yves Mantel, Hans-Peter Beck and Nico Bruns ()
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Omar Rifaie-Graham: University of Fribourg
Jonas Pollard: University of Fribourg
Samuel Raccio: University of Fribourg
Sandor Balog: University of Fribourg
Sebastian Rusch: Swiss Tropical and Public Health Institute
María Andrea Hernández-Castañeda: University of Fribourg
Pierre-Yves Mantel: University of Fribourg
Hans-Peter Beck: Swiss Tropical and Public Health Institute
Nico Bruns: University of Fribourg

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Methods to diagnose malaria are of paramount interest to eradicate the disease. Current methods have severe limitations, as they are either costly or not sensitive enough to detect low levels of parasitemia. Here we report an ultrasensitive, yet low-resource chemical assay for the detection and quantification of hemozoin, a biomarker of all Plasmodium species. Solubilized hemozoin catalyzes the atom transfer radical polymerization of N-isopropylacrylamide above the lower critical solution temperature of poly(N-isopropylacrylamide). The solution becomes turbid, which can be observed by naked eye and quantified by UV-visible spectroscopy. The rate of turbidity increase is proportional to the concentration of hemozoin, with a detection limit of 0.85 ng mL−1. Malaria parasites in human blood can be detected down to 10 infected red blood cells μL−1. The assay could potentially be applied as a point-of-care test. The signal-amplification of an analyte by biocatalytic precipitation polymerization represents a powerful approach in biosensing.

Date: 2019
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DOI: 10.1038/s41467-019-09122-z

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