Abstract
Amino acid tryptophan is an advantageous reagent for preparation of biocompatible noble metal nanoparticles as promising anticancer agents. The reduction of metal ions in the presence of tryptophan proceeds through the indole moiety of the molecule. The formation of silver nanoparticles, namely the redox process between Ag+ and Trp, was activated by UV-C LED irradiation at 278 nm, corresponding to the position of the indole absorption band. The experimental parameters of irradiation were varied systematically aiming to influence the kinetics of the process and properties of prepared Ag nanoparticles. The dependence of optical spectra and size distribution of Ag nanoparticles on temperature of reaction (25, 40 and 60 °C) and output optical power density (0.4, 0.6 and 1.0 mW/cm2) were investigated by UV–vis absorption spectroscopy and dynamic light scattering data. Under UV irradiation, the rate of Ag nanoparticles formation can be accelerated by a factor of 10 with increase of the temperature from 25 to 60 °C, leading to the shift of plasmon absorption band maxima from 422 to 412 nm. The optimal UV irradiation parameters and temperature of reaction can be a basis for preparing colloids with tailored dispersity and optical properties.
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08 July 2019
In the original publication of the article, the co-author’s name was incorrectly published as “O. N. Kachalova”.
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Acknowledgements
The authors are grateful to S. Kolotilov and R. Barakov for the support of the DLS study. National Academy of Sciences of Ukraine supported this work in the framework of grants of NASU for the research laboratory/group of young scientists of NASU for conducting investigations in priority directions of science and technology development in 2018–2019 (No. 29/2018-2019).
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The original version of this article was revised: The co-author’s name was incorrectly published as “O. N. Kachalova”. However, it should be “N. Kachalova”.
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Mukha, I., Vityuk, N., Khodko, A. et al. Photo- and temperature-dependent formation of tryptophan/silver nanoparticles. Res Chem Intermed 45, 4053–4066 (2019). https://doi.org/10.1007/s11164-019-03890-5
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DOI: https://doi.org/10.1007/s11164-019-03890-5