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Magnetite/Rhodamine 6G nanoparticles internalization in Neurospora crassa cells: towards the magnetic hyperthermia application

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Abstract

In this work, the study of aqueous media co-precipitation-obtained magnetite nanoparticles (Fe3O4-NPs) and Rhodamine 6G coating nanoparticles: Fe3O4/Rh6G-NPs, stabilized with polyethylene glycol is presented. To assess their suitability for magnetic hyperthermia application, cellular internalization of Fe3O4/Rh6G nanoparticles using the fungus Neurospora crassa as a model system was also explored. The structural characterization by Infrared and Raman spectroscopies, as well as Transmission Electron Microscopy (TEM) of this material showed that the Fe3O4/Rh6G-NPs are chemically stable with a pure crystalline phase, exhibiting an average particle size of 38.6 ± 6.4 nm and a near-spherical shape; all these properties are desired for nanoparticles that are intended to be used in biomedical applications. Additionally, a marked superparamagnetic behavior in the composite was revealed by the magnetic characterization. The living cells exposed to Fe3O4/Rh6G-NPs showed fluorescence from the apical dome to the basal zone of the hyphae scanned under confocal microscopy; while TEM observations of ultrathin sections demonstrated the presence of Fe3O4/Rh6G-NPs throughout the cytoplasm of the fungus, corroborating internalization of the nanocomposite. It is worth mentioning that alteration of fungus growth or cell morphology after exposure to Fe3O4/Rh6G-NPs were not observed, which represent an important precedent of internalization of inorganic materials-based nanocomposites in cells for further exploration of magnetic hyperthermia applications.

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Acknowledgements

This work was supported by CONACYT [Grant numbers 280518 and A1-S-34533]. The authors thank Sc.M. Lizbeth Triana (CCIQS) for technical assistance with IR spectroscopy.

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Correspondence to Alfredo Rafael Vilchis-Nestor.

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Hernández-Guerrero, N., Castro-Longoria, E., Torres-Gómez, N. et al. Magnetite/Rhodamine 6G nanoparticles internalization in Neurospora crassa cells: towards the magnetic hyperthermia application. Appl Nanosci 12, 1791–1802 (2022). https://doi.org/10.1007/s13204-021-02317-1

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  • DOI: https://doi.org/10.1007/s13204-021-02317-1

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