Mössbauer spectroscopy of frozen solutions as a stepwise control tool in preparation of biocompatible humic-stabilized feroxyhyte nanoparticles

Polyakov, Alexander Yu.; Sorkina, T.A.; Goldt, Anastasia E.; Pankratov, D. А.; Perminova, Irina V.; Goodilin, Eugene A.

doi:10.1007/s10751-013-0812-y

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…It should be noted that a similar assembling effect was found for the synthetic dendrimers and Fe 3 O 4 nanoparticles [14]. The superparamagnetic behavior of dried HA-stabilized γ-Fe 2 O 3 nanoparticles was confirmed using Mössbauer spectroscopy at 300 K and 77 K, which is also a powerful tool to study the iron oxide speciation [8,15]. The characteristic paramagnetic signal (doublet) observed at room temperature (Fig.…”

Section: Resultssupporting

confidence: 64%

“…It was previously demonstrated that the humic acids (HA), i.e. the natural organic matter originating from biochemical and microbiological transformations of organic materials under environmental conditions, can efficiently stabilize iron oxide nanoparticles due to the numerous highly developed branches with irregularly located organic functional groups [6][7][8][9][10][11]. However, the colloidal stability of the resulting core-shell organic-inorganic nanomaterials at different pH values was not characterized, while it is crucial for biomedical applications of the stabilized SPIONs.…”

Section: Introductionmentioning

confidence: 99%

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Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Goldt¹,

Polyakov²,

Sorkina³

et al. 2019

Nanosystems: Phys. Chem. Math.

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Superparamagnetic iron oxide γ-Fe 2 O 3 (maghemite) nanoparticles (SPION) encapsulated into water-soluble microspheres of rock salt were synthesized via a new aerosol spray pyrolysis procedure. Humic acids (HA) were employed to stabilize the aqueous suspensions of γ-Fe 2 O 3 nanoparticles released upon dissolution of the NaCl matrix. The effect of HA on the surface charge of maghemite-based colloids was studied in pH range of 3 -10. Humic polyanions compensate positive charges on a hydrated γ-Fe 2 O 3 surface resulting in strongly negative ζ-potential (< −40 mV) of colloid even in acidic environment. In neutral and alkaline environment, ζ-potential of maghemite-based colloid drops below −55 mV; thus, HA should effectively stabilize the nanoparticle colloid over the whole pH range studied. Meanwhile, bare maghemite SPION at pH 3 -6 have ζ-potential in the +20 mV to −20 mV range (isoelectric point at pH 4.35), which is insufficient for electrostatic stabilization of the suspensions. The absence of embryotoxicity of HA-stabilized nanoparticles was demonstrated.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Goldt¹,

Polyakov²,

Sorkina³

et al. 2019

Nanosystems: Phys. Chem. Math.

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“…The recent extensive studies of Colombo and his group , have shown that the phase of iron (hydr)oxide formed in the presence of HS strongly depends on pH, oxidation rate, and Fe:HS ratio. , The estimates on crystallinity and size of Fe-HS coprecipitates revealed amorphous character and sizes ranging from 5 to 20 nm up to aggregates of 100–1000 nm . Our studies have shown substantial size reduction of feroxyhyte NPs from submicron sizes (300–400 nm) down to 20–30 nm in the presence of HS traces under conditions of rapid oxidations, and the formed NPs maintained crystalline character. , However, a use of high HS:Fe ratios and slow oxidation rates yielded highly amorphous iron-HS compounds represented by iron (hydr)oxides NPs with sizes from 5 to 20 nm . Hence, the presence of HS in soils favors formation of iron (hydr)oxide particles which are much smaller in size and less crystalline as compared to those formed by the processes unaffected by HS.…”

Section: Introductionsupporting

confidence: 57%

Key Roles of Size and Crystallinity of Nanosized Iron Hydr(oxides) Stabilized by Humic Substances in Iron Bioavailability to Plants

Куликова

Polyakov

Лебедев

et al. 2017

J. Agric. Food Chem.

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Availability of Fe in soil to plants is closely related to the presence of humic substances (HS). Still, the systematic data on applicability of iron-based nanomaterials stabilized with HS as a source for plant nutrition are missing. The goal of our study was to establish a connection between properties of iron-based materials stabilized by HS and their bioavailability to plants. We have prepared two samples of leonardite HS-stabilized iron-based materials with substantially different properties using the reported protocols and studied their physical chemical state in relation to iron uptake and other biological effects. We used Mössbauer spectroscopy, XRD, SAXS, and TEM to conclude on iron speciation, size, and crystallinity. One material (Fe-HA) consisted of polynuclear iron(III) (hydr)oxide complexes, so-called ferric polymers, distributed in HS matrix. These complexes are composed of predominantly amorphous small-size components (<5 nm) with inclusions of larger crystalline particles (the mean size of (11 ± 4) nm). The other material was composed of well-crystalline feroxyhyte (δ'-FeOOH) NPs with mean transverse sizes of (35 ± 20) nm stabilized by small amounts of HS. Bioavailability studies were conducted on wheat plants under conditions of iron deficiency. The uptake studies have shown that small and amorphous ferric polymers were readily translocated into the leaves on the level of Fe-EDTA, whereas relatively large and crystalline feroxyhyte NPs were mostly sorbed on the roots. The obtained data are consistent with the size exclusion limits of cell wall pores (5-20 nm). Both samples demonstrated distinct beneficial effects with respect to photosynthetic activity and lipid biosynthesis. The obtained results might be of use for production of iron-based nanomaterials stabilized by HS with the tailored iron availability to plants. They can be applied as the only source for iron nutrition as well as in combination with the other elements, for example, for industrial production of "nanofortified" macrofertilizers (NPK).

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“…This observation indicates that the polyanion participates in the crystal growth process and acts as a crystal growth suppressor, probably, due to the formation of an intermediate compound. This speculation has been confirmed by a Mössbauer study [30] where it has been shown that feroxyhyte nanoparticles formation in the presence of a humic substance proceeds via a Fe(OH) 2 intermediate, which gives smaller nanoparticles. According to TEM images (Supplementary Figure S2), it is clear that nanoparticles of all prepared samples are of a round shape and do not contain nanoparticles of another shape, which confirms that there are no impurity phases in the samples.…”

Section: Structural Analysismentioning

confidence: 67%

“…In the literature, one can find reports on using HSs as a stabilizer for nanoparticles of metals [26,27] and oxides [28][29][30][31][32]. However, their use is not only limited to preventing aggregation of nanoparticles but it is suggested that derivatives of humic acid could play a role of a functional component, for example, in processes of water cleaning from heavy metals [33,34] and organic contaminants [35,36].…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis of Water-Dispersible Humate-Coated Magnetite Nanoparticles: Relation of Coating Process Parameters to the Properties of Nanoparticles

et al. 2020

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Nowadays, there is a demand in the production of nontoxic multifunctional magnetic materials possessing both high colloidal stability in water solutions and high magnetization. In this work, a series of water-dispersible natural humate-polyanion coated superparamagnetic magnetite nanoparticles has been synthesized via microwave-assisted synthesis without the use of inert atmosphere. An impact of a biocompatible humate-anion as a coating agent on the structural and physical properties of nanoparticles has been established. The injection of humate-polyanion at various synthesis stages leads to differences in the physical properties of the obtained nanomaterials. Depending on the synthesis protocol, nanoparticles are characterized by improved monodispersity, smaller crystallite and grain size (up to 8.2 nm), a shift in the point of zero charge (6.4 pH), enhanced colloidal stability in model solutions, and enhanced magnetization (80 emu g−1).

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Mössbauer spectroscopy of frozen solutions as a stepwise control tool in preparation of biocompatible humic-stabilized feroxyhyte nanoparticles

Cited by 10 publications

References 22 publications

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Key Roles of Size and Crystallinity of Nanosized Iron Hydr(oxides) Stabilized by Humic Substances in Iron Bioavailability to Plants

Microwave-Assisted Synthesis of Water-Dispersible Humate-Coated Magnetite Nanoparticles: Relation of Coating Process Parameters to the Properties of Nanoparticles

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