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  • Micromagnetic resonance relaxometry for rapid label-free malaria diagnosis

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    97518_1.pdf (1.206Mb)
    Author(s)
    Peng, Weng Kung
    Kong, Tian Fook
    Ng, Chee Sheng
    Chen, Lan
    Huang, Yongxue
    Bhagat, Ali Asgar S
    Nam-Trung, Nguyen
    Preiser, Peter Rainer
    Han, Jongyoon
    Griffith University Author(s)
    Nguyen, Nam-Trung
    Year published
    2014
    Metadata
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    Abstract
    We report a new technique for sensitive, quantitative and rapid detection of Plasmodium spp.-infected red blood cells (RBCs) by means of magnetic resonance relaxometry (MRR). During the intraerythrocytic cycle, malaria parasites metabolize large amounts of cellular hemoglobin and convert it into hemozoin crystallites. We exploit the relatively large paramagnetic susceptibility of these hemozoin particles, which induce substantial changes in the transverse relaxation rate of proton nuclear magnetic resonance of RBCs, to infer the 'parasite load' in blood. Using an inexpensive benchtop 0.5-Tesla MRR system, we show that with ...
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    We report a new technique for sensitive, quantitative and rapid detection of Plasmodium spp.-infected red blood cells (RBCs) by means of magnetic resonance relaxometry (MRR). During the intraerythrocytic cycle, malaria parasites metabolize large amounts of cellular hemoglobin and convert it into hemozoin crystallites. We exploit the relatively large paramagnetic susceptibility of these hemozoin particles, which induce substantial changes in the transverse relaxation rate of proton nuclear magnetic resonance of RBCs, to infer the 'parasite load' in blood. Using an inexpensive benchtop 0.5-Tesla MRR system, we show that with minimal sample preparatory steps and without any chemical or immunolabeling, a parasitemia level of fewer than ten parasites per microliter in a volume below 10 嬠of whole blood is detected in a few minutes. We demonstrate this method both for cultured Plasmodium falciparum parasites and in vivo with Plasmodium berghei-infected mice.
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    Journal Title
    Nature Medicine
    Volume
    20
    Issue
    9
    DOI
    https://doi.org/10.1038/nm.3622
    Copyright Statement
    © 2014 Nature Publishing Group. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
    Subject
    Biomedical instrumentation
    Signal processing
    Biomedical and clinical sciences
    Haematology
    Publication URI
    http://hdl.handle.net/10072/63070
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    • Journal articles

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