Mixtures of l-Amino Acids as Reaction Medium for Formation of Iron Nanoparticles: The Order of Addition into a Ferrous Salt Solution Matters
| Autor: | Libor Machala, Peter Mojzeš, Jiří Tuček, Josef Kašlík, Karolina Siskova, Radek Zbořil |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Iron
Inorganic chemistry Oxide arginate Nanoparticle arginine glutamate Catalysis Article Ferrous Inorganic Chemistry lcsh:Chemistry chemistry.chemical_compound Magnetics medicine Physical and Theoretical Chemistry Amino Acids Molecular Biology lcsh:QH301-705.5 Spectroscopy chemistry.chemical_classification Zerovalent iron zero-valent iron Mössbauer spectroscopy SERS Organic Chemistry γ-Fe2O3 General Medicine Computer Science Applications Amino acid Solutions FeOOH NZVI glutamic acid nanomagnetism chemistry lcsh:Biology (General) lcsh:QD1-999 Magnetic nanoparticles Ferric Nanoparticles Oxidation-Reduction medicine.drug Superparamagnetism |
| Zdroj: | International Journal of Molecular Sciences, Vol 14, Iss 10, Pp 19452-19473 (2013) International Journal of Molecular Sciences International Journal of Molecular Sciences; Volume 14; Issue 10; Pages: 19452-19473 |
| ISSN: | 1422-0067 |
| Popis: | Owing to Mössbauer spectroscopy, an advanced characterization technique for iron-containing materials, the present study reveals previously unknown possibilities using l-amino acids for the generation of magnetic particles. Based on our results, a simple choice of the order of l-amino acids addition into a reaction mixture containing ferrous ions leads to either superparamagnetic ferric oxide/oxyhydroxide particles, or magnetically strong Fe0-Fe2O3/FeOOH core-shell particles after chemical reduction. Conversely, when ferric salts are employed with the addition of selected l-amino acids, only Fe0-Fe2O3/FeOOH core-shell particles are observed, regardless of the addition order. We explain this phenomenon by a specific transient/intermediate complex formation between Fe2+ and l-glutamic acid. This type of complexation prevents ferrous ions from spontaneous oxidation in solutions with full air access. Moreover, due to surface-enhanced Raman scattering spectroscopy we show that the functional groups of l-amino acids are not destroyed during the borohydride-induced reduction. These functionalities can be further exploited for (i) attachment of l-amino acids to the as-prepared magnetic particles, and (ii) for targeted bio- and/or environmental applications where the surface chemistry needs to be tailored and directed toward biocompatible species. |
| Databáze: | OpenAIRE |
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