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Diamond Magnetic Microscopy of Malarial Hemozoin Nanocrystals

Journal Article · · Physical Review Applied
 [1];  [2];  [3];  [2];  [4];  [5];  [6];  [7];  [2]
  1. Univ. of New Mexico, Albuquerque, NM (United States). Center for High Technology Materials (CHTM); DOE/OSTI
  2. Univ. of New Mexico, Albuquerque, NM (United States). Center for High Technology Materials (CHTM)
  3. Univ. of New Mexico, Albuquerque, NM (United States). Center for High Technology Materials (CHTM); Univ. of Latvia, Riga (Latvia)
  4. Univ. of New Mexico, Albuquerque, NM (United States). Center for High Technology Materials (CHTM); Harvard Univ., Cambridge, MA (United States)
  5. Univ. of California, San Francisco, CA (United States)
  6. Johannes Gutenberg Univ., Mainz (Germany)
  7. Univ. of California, Berkeley, CA (United States); ODMR Technologies, Inc., El Cerrito, CA (United States)

Magnetic microscopy of malarial hemozoin nanocrystals is performed by optically detected magnetic resonance imaging of near-surface diamond nitrogen-vacancy centers. Hemozoin crystals are extracted from Plasmodium falciparum–infected human blood cells and studied alongside synthetic hemozoin crystals. The stray magnetic fields produced by individual crystals are imaged at room temperature as a function of the applied field up to 350 mT. More than 100 nanocrystals are analyzed, revealing the distribution of their magnetic properties. Most crystals (96%) exhibit a linear dependence of the stray-field magnitude on the applied field, confirming hemozoin’s paramagnetic nature. A volume magnetic susceptibility of 3.4 × 10–4 is inferred with use of a magnetostatic model informed by correlated scanning-electron-microscopy measurements of crystal dimensions. A small fraction of nanoparticles (4/82 for Plasmodium falciparum–produced nanoparticles and 1/41 for synthetic nanoparticles) exhibit a saturation behavior consistent with superparamagnetism. Translation of this platform to the study of living Plasmodium-infected cells may shed new light on hemozoin formation dynamics and their interaction with antimalarial drugs.

Research Organization:
Sandia National Laboratory (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Sponsoring Organization:
USDOE; National Institute of General Medical Sciences (NIGMS); National Institute of Mental Health (NIMH); National Institute of Biomedical Imaging and Bioengineering (NIBIB)
OSTI ID:
1625641
Journal Information:
Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 3 Vol. 11; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

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