Chiroplasmonic magnetic gold nanocomposites produced by one-step aqueous method using κ-carrageenan

Lesnichaya, M. V.; Сухов, Б. Г.; Александрова, Г. П.; Gasilova, Ekaterina R.; Vakul’skaya, T. I.; Khutsishvili, Spartak S.; Сапожников, А. Н.; Клименков, И. В.; Трофимов, Б. А.

doi:10.1016/j.carbpol.2017.07.040

Cited by 29 publications

(9 citation statements)

References 37 publications

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“…The obtained similar FTIR spectra of all synthesized NCs and their polysaccharides, largely coinciding with each other, can be explained by the common polysaccharide nature of biopolymer matrices in these NCs ( Figure 1 and Figure S1 ). Thus, the prevailing broad absorption in the range of 3000–3800 cm −1 , as well as 1636 cm −1 , refers to hydroxyl groups in macromolecules of polysaccharides, the IR absorption region of 2850–3000 cm −1 refers to the CH bonds, and the group of signals in the region 1000–1200 cm −1 refer to ether C–O–C bonds ( Figure 1 , depicted by a continuous oval) [ 50 ]. In addition to these IR absorption bands common to all NC bands, there was also a region from 1230–1260 cm −1 for Se/CAR NC, which belongs to the sulfoether groups of carrageenan, a band with a maximum of 928 cm −1 , which belongs to the C–O–C ester bond of the anhydrogalactose carrageenan cycle, as well as the 845 cm −1 band, which belongs to the sulfo groups of galactose-4-sulfate carrageenan units [ 50 ].…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the prevailing broad absorption in the range of 3000–3800 cm −1 , as well as 1636 cm −1 , refers to hydroxyl groups in macromolecules of polysaccharides, the IR absorption region of 2850–3000 cm −1 refers to the CH bonds, and the group of signals in the region 1000–1200 cm −1 refer to ether C–O–C bonds ( Figure 1 , depicted by a continuous oval) [ 50 ]. In addition to these IR absorption bands common to all NC bands, there was also a region from 1230–1260 cm −1 for Se/CAR NC, which belongs to the sulfoether groups of carrageenan, a band with a maximum of 928 cm −1 , which belongs to the C–O–C ester bond of the anhydrogalactose carrageenan cycle, as well as the 845 cm −1 band, which belongs to the sulfo groups of galactose-4-sulfate carrageenan units [ 50 ]. The absence of pronounced changes in the FTIR absorption bands between polysaccharides and their corresponding Se NCs indicates that polysaccharide matrices are not involved in the redox processes of the synthesis of Se NCs.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Natural Polysaccharide Matrix-Based Selenium Nanocomposites on Phytophthora cactorum and Rhizospheric Microorganisms

et al. 2021

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We studied the effects of new chemically synthesized selenium (Se) nanocomposites (NCs) based on natural polysaccharide matrices arabinogalactan (AG), starch (ST), and kappa-carrageenan (CAR) on the viability of phytopathogen Phytophthora cactorum, rhizospheric bacteria, and potato productivity in the field experiment. Using transmission electron microscopy (TEM), it was shown that the nanocomposites contained nanoparticles varying from 20 to 180 nm in size depending on the type of NC. All three investigated NCs had a fungicidal effect even at the lowest tested concentrations of 50 µg/mL for Se/AG NC (3 µg/mL Se), 30 µg/mL for Se/ST NC (0.5 µg/mL Se), and 39 µg/mL for Se/CAR NC (1.4 µg/mL Se), including concentration of 0.000625% Se (6.25 µg/mL) in the final suspension, which was used to study Se NC effects on bacterial growth of the three common rhizospheric bacteria Acinetobacter guillouiae, Rhodococcus erythropolis and Pseudomonas oryzihabitans isolated from the rhizosphere of plants growing in the Irkutsk Region. The AG-based Se NC (Se/AG NC) and CAR-based Se NC (Se/CAR NC) exhibited the greatest inhibition of fungal growth up to 60% (at 300 µg/mL) and 49% (at 234 µg/mL), respectively. The safe use of Se NCs against phytopathogens requires them to be environmentally friendly without negative effects on rhizospheric microorganisms. The same concentration of 0.000625% Se (6.25 µg/mL) in the final suspension of all three Se NCs (which corresponds to 105.57 µg/mL for Se/AG NC, 428.08 µg/mL for Se/ST NC and 170.30 µg/mL for Se/CAR NC) was used to study their effect on bacterial growth (bactericidal, bacteriostatic, and biofilm formation effects) of the three rhizospheric bacteria. Based on our earlier studies this concentration had an antibacterial effect against the phytopathogenic bacterium Clavibacter sepedonicus that causes diseases of potato ring rot, but did not negatively affect the viability of potato plants at this concentration. In this study, using this concentration no bacteriostatic and bactericidal activity of all three Se NCs were found against Rhodococcus erythropolis based on the optical density of a bacterial suspension, agar diffusion, and intensity of biofilm formation, but Se/CAR and AG NCs inhibited the growth of Pseudomonas oryzihabitans. The cell growth was decrease by 15–30% during the entire observation period, but the stimulation of biofilm formation by this bacterium was observed for Se/CAR NC. Se/AG NC also had bacteriostatic and antibiofilm effects on the rhizospheric bacterium Acinetobacter guillouiae. There was a 2.5-fold decrease in bacterial growth and a 30% decrease in biofilm formation, but Se/CAR NC stimulated the growth of A. guillouiae. According to the results of the preliminary field test, an increase in potato productivity by an average of 30% was revealed after the pre-planting treatment of tubers by spraying them with Se/AG and Se/CAR NCs with the same concentration of Se of 0.000625% (6.25 µg/mL) in a final suspension. The obtained and previously published results on the positive effect of natural matrix-based Se NCs on plants open up prospects for further investigation of their effects on rhizosphere bacteria and resistance of cultivated plants to stress factors.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Natural Polysaccharide Matrix-Based Selenium Nanocomposites on Phytophthora cactorum and Rhizospheric Microorganisms

et al. 2021

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“…This problem could be addressed by the synthesis of Se 0 NPs directly from the elemental bulk selenium, which is an inexpensive and available chemical precursor, and also using natural water-soluble sulphated polysaccharide κ-carrageenan (κ-CG). Previously, κ-CG has shown itself as an effective stabiliser of the inorganic nanoparticles (Ag, Au, CdSe, and NH 4 MgPO 4 ) [19][20][21][22]. At the same time, κ-CG is a renewable natural raw material widely employed in the food and pharmaceutical industries [23].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and comparative assessment of antiradical activity, toxicity, and biodistribution of κ‐carrageenan‐capped selenium nanoparticles of different size: in vivo and in vitro study

Lesnichaya

Shendrik

Титов

et al. 2020

IET nanobiotechnol.

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In the present study, water-soluble hybrid selenium-containing nanocomposites have been synthesised via soft oxidation of selenide-anions, preliminarily generated from elemental bulk-selenium in the base-reduction system 'N 2 H 4-NaOH'. The nanocomposites obtained consist of Se 0 NPs (4.6-24.5 nm) stabilised by κ-carrageenan biocompatible polysaccharide. The structure of these composite nanomaterials has been proven using complementary physical-chemical methods: X-ray diffraction analysis, transmission electron microscopy, optical spectroscopy, and dynamic light scattering. Optical ranges of 'emission/ excitation' of aqueous solutions of nanocomposites with Se 0 NPs of different sizes are established and the most important parameters of their luminescence are determined. For the obtained nanocomposites, the expressed antiradical activity against free radicals 2,2-diphenyl-1-picrylhydrazyl and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid has been found, the value of which depends on the size of selenium nanoparticles. It is experimentally revealed that all obtained nanocomposites are low toxic (LD 50 >2000 mg/kg). It is also found that small selenium nanoparticles (6.8 nm), in contrast to larger nanoparticles (24.5 nm), are accumulated in organisms to significantly increase the level of selenium in the liver, kidneys, and brain (in lesser amounts) of rats.

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“…The κ‐carrageenan's family includes gelling κ‐, ι‐carrageenans widely used in food technology, cosmetics, and medicine . κ‐carrageenan was also applied as a template and reducing agent in the synthesis of different inorganic nanoparticles …”

Section: Introductionmentioning

confidence: 99%

“…The alkaline treatment is accompanied by peeling, for example, progressive decreasing of molecular mass . Intensive alkaline peeling of κ‐carrageenan during the synthesis of Au nanoparticles (NP) where κ‐carrageenan is used both as reducing and capping agent is indicated by increasing amount of reducing aldehyde groups . Therefore, the aim of the current work was to study independently deep alkaline hydrolysis of the virgin κ‐carrageenan in order to get better insight into the structure of colloids formed by its nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Association of κ‐carrageenan subjected to deep alkaline hydrolysis

et al. 2018

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κ‐carrageenan is a linear sulfated anionic gelling polysaccharide obtained from red seaweed algae by an alkaline hydrolysis. We applied static and dynamic light scattering (DLS), capillary viscometry, FT‐IR, and electrophoretic DLS to gain insight into the effect of deep alkaline hydrolysis (95 °C, pH = 10 during Th = 60, 75, and 90 min) on κ‐carrageenan macromolecules in a coil conformation. As DLS of coil‐like κ‐carrageenans is usually complicated by spurious permanent aggregates, the alkaline hydrolysis of κ‐carrageenans has not been studied by DLS. By applying a double‐dialysis procedure (first against water, then against 0.1 M NaCl), we succeeded in obtaining dilute solutions of coil‐like κ‐carrageenans with unimodal DLS distributions. Association that started with increasing concentration was attributed to attractive dipole‐dipole interactions between ion‐pairs formed by condensed counter‐ions in the vicinity of carboxyl groups of the reducing ends. The second type of stickers resulted from the compositional heterogeneity of κ‐carrageenan, namely, from the traces of ι‐carrageenan blocks which amount increased with hydrolysis. With increasing Th we observed both the progressive decrease of molecular mass and the growth of association. Lowering the temperature and increasing concentration during lyophilization strengthened the intermolecular junctions, leading to the formation of permanent aggregates.

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Chiroplasmonic magnetic gold nanocomposites produced by one-step aqueous method using κ-carrageenan

Cited by 29 publications

References 37 publications

Effect of Natural Polysaccharide Matrix-Based Selenium Nanocomposites on Phytophthora cactorum and Rhizospheric Microorganisms

Effect of Natural Polysaccharide Matrix-Based Selenium Nanocomposites on Phytophthora cactorum and Rhizospheric Microorganisms

Synthesis and comparative assessment of antiradical activity, toxicity, and biodistribution of κ‐carrageenan‐capped selenium nanoparticles of different size: in vivo and in vitro study

Association of κ‐carrageenan subjected to deep alkaline hydrolysis

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