Observation of metal nanoparticles at atomic resolution in Pt‐based cancer chemotherapeutics

Observation of metal nanoparticles at atomic resolution in Pt‐based cancer chemotherapeutics The chemotherapeutics cisplatin and oxaliplatin are important tools in the fight against cancer. Both compounds are platinum complexes. Aberration‐corrected scanning transmission electron microscopy using the annular dark‐field imaging mode now routinely provides single‐atom sensitivity with atomic number contrast. Here, this imaging mode is used to directly image the platinum within the two drugs in their dried form on an amorphous carbon support film. The oxaliplatin is found to have wetted the supporting amorphous carbon, forming disordered clusters suggesting that the platinum has remained within the complex. Conversely, the cisplatin sample reveals 1.8‐nm‐diameter metallic platinum clusters. The size and shape of the clusters do not appear to be dependent on drying rate nor formed by beam damage, which may suggest that they were present in the original drug solution. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Microscopy Wiley

Observation of metal nanoparticles at atomic resolution in Pt‐based cancer chemotherapeutics

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
Journal compilation © 2018 Royal Microscopical Society
ISSN
0022-2720
eISSN
1365-2818
D.O.I.
10.1111/jmi.12659
Publisher site
See Article on Publisher Site

Abstract

The chemotherapeutics cisplatin and oxaliplatin are important tools in the fight against cancer. Both compounds are platinum complexes. Aberration‐corrected scanning transmission electron microscopy using the annular dark‐field imaging mode now routinely provides single‐atom sensitivity with atomic number contrast. Here, this imaging mode is used to directly image the platinum within the two drugs in their dried form on an amorphous carbon support film. The oxaliplatin is found to have wetted the supporting amorphous carbon, forming disordered clusters suggesting that the platinum has remained within the complex. Conversely, the cisplatin sample reveals 1.8‐nm‐diameter metallic platinum clusters. The size and shape of the clusters do not appear to be dependent on drying rate nor formed by beam damage, which may suggest that they were present in the original drug solution.

Journal

Journal of MicroscopyWiley

Published: Jan 1, 2018

Keywords: ; ; ; ;

References

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