Abstract
In current biomedically oriented research, the development of a biomimetic nanoparticle platform is of interest to provide a molecular toolbox (i.e., allowing easy modular exchange of its parts depending on actual needs while being nontoxic and allowing real-time recognition and tracking using various methods, such as fluorescence). We report the development of germanium(IV) oxide-polysaccharide composite particles possessing these properties. The nanoparticles are based on a crystalline germanium oxide core with a size range of 20–30 and 300–900 nm. Two new simple coating techniques were compared for the preparation of the photoluminescent polysaccharide-coated germanium(IV) oxide nanoparticles. The germanium(IV)-based core allows for in situ polysaccharide attachment via direct chelation. In addition, the nanoparticles were coated with thin layer of silicon oxide. After coating, 3-(triethoxysilyl)propyl isocyanate was grafted onto the surface, and the polysaccharides were immobilized on the particle surface via a covalent urethane linkage, which allows for an even more stable polysaccharide coating than that obtained via chelation. This approach provides access to a new material platform for biological track and image applications.
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Acknowledgments
The authors kindly thank Michal Pekárek and Nikolay Kotov for the FTIR and FT-Raman spectroscopy; Jiřina Hromádková, Alexandra Ostafinska, and Dr. Sabina Krejčíková for electron microscopy; Alexandra Paruzel and Dr. Jana Kovářová for thermogravimetry; Eva Miškovská and Dr. Alexander Zhigunov for XRD and WAXS measurements; and Helena Hlídková and Dr. Daniel Horák for BET. Financial support from the Centre National de la Recherche Scientifique—CNRS, France (project PICS no. 06130), Ministry of Education, Youth and Sports of the Czech Republic (grant no. 7AMB14FR027), the Grant Agency of the Czech Republic (grant no. 13-08336S), the PHC-Barrande program (grant no. 31271XF), and the Ministry of Health of the Czech Republic (grant no. 15-25781A) is greatly appreciated.
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Colloidal properties of polysaccharides; SEM images, number average size distributions (image analysis) and colloidal properties of GeO2 from aqueous solutions; TEM images, number average size distributions (DLS) and colloidal properties of GeO2 from ethanolic solutions and coated GeO2@SiO2; FTIR and FT-Raman spectra; calculation of the crystalline size; thermogravimetry. (PDF 4.10 mb)
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Lobaz, V., Rabyk, M., Pánek, J. et al. Photoluminescent polysaccharide-coated germanium(IV) oxide nanoparticles. Colloid Polym Sci 294, 1225–1235 (2016). https://doi.org/10.1007/s00396-016-3882-y
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DOI: https://doi.org/10.1007/s00396-016-3882-y