Redox reactions of arabinogalactan with silver ions and formation of nanocomposites

Грищенко, Л. А.; Медведева, С. А.; Александрова, Г. П.; Феоктистова, Л. П.; Сапожников, А. Н.; Сухов, Б. Г.; Trofimov, B. A.

doi:10.1134/s1070363206070189

Cited by 34 publications

(11 citation statements)

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“…4, 11 The simultaneous stabiliza tion of the formed nanoparticles of reduced silver occurs, probably, due to cooperative, ionic, intermolecular, van der Waals, and other interactions between the nanoparti cle surface and fragments of the polysaccharide macro molecules (hydroxyl and carbonyl groups, as well as sul fate groups in the case of carrageenan) to form the stable metallic nanophase. 11, 22 The substantial influence of the type of the polysac charide matrix on the maximum content of silver in the stable nanocomposites was found. For instance, nano composites with the silver content up to 17.0% were ob tained from galactomannan (branched polysaccharide).…”

Section: Resultsmentioning

confidence: 96%

“…22 As a result of the reactions of silver nitrate with galacto mannan and carrageenan in an aqueous alkaline medium, we obtained a series of water soluble nanocomposites, whose structures combine the above mentioned poly saccharides and silver in the amount from 2.5 to 17.0%. It was established that rather stable nanocomposites (1-4 weeks) can be obtained using AgNO 3 in an amount of 0.04-0.33 and 0.04-0.30 g per 1 g of galactomannan and carrageenan, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Silver-containing nanocomposites based on galactomannan and carrageenan: synthesis, structure, and antimicrobial properties

et al. 2010

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Water soluble silver containing nanocomposites based on biocompatible polysaccharides, galactomannan and carrageenan, were synthesized for the first time. A complex of physico chemical methods was employed to establish the phase composition, the average size of metal nanoparticles, and the morphology of new nanobiocomposites. The obtained nanomaterials possess high antimicrobial activity.Despite continuous sophistication of antibiotics, they are yet insufficiently selective (i.e., have a wide range of action), toxic, and rapidly cause specific resistance in pathogenic and opportunistic microorganisms. 1 At the same time, preparations of highly dispersed silver are highly active antimicrobial agents known for many centuries. 2-5 The most important factor for the increasing biological activity of the silver preparations is the enhancement of their transmembrane permeability, 3 which makes it possible to substantially decrease the therapeutic dose and thus diminish the drug load on the organism. One of the prom ising methods of achieving transmembrane permeability can be the transformation of silver into the nanosized state with the simultaneous inclusion of silver nanoparticles into matrices of polysaccharides galactomannan and carrag eenan, which impart water solubility and higher biocom patibility to the constructed materials. The galactomannan macromolecules contain the α galactose residues performing membrane transport functions due to the high affinity to asialoglycoprotein receptors of the cell membranes. 6-9 Carrageenan has another valuable property, viz., the ability to form water retaining hydrogels, which is very important for the development of materials for wound coatings. 10 It is known that the choice of a stabilizer for thermo dynamically unstable nanoparticles formed is very signifi cant along with the choice of reactants in the syntheses of the nanocomposites. 11-17 . Compounds containing reduc tive and other polar groups (alcohols, aldehydes, saccha rides, polysaccharides, and others), which can simulta neously act as reducing agents and stabilizers of formed nanoparticles, are widely used in practice for this purpose. For example, natural galactose containing heteropolysac charide, viz., arabinogalactan, was successfully used 18-22 for the synthesis of related hybrid metal containing nano composites.The purpose of this work is the synthesis and study of the structure and antimicrobial properties of the hybrid nanocomposites based on biocompatible galactose con taining polysaccharides, viz., galactomannan and car rageenan. Results and DiscussionWater soluble natural galactose containing polysac charides, galactomannan (2440 kDa) and carrageenan (1980 kDa), were used as stabilizing matrices for the prep aration of new silver containing nanocomposites. The ba sis of the galactomannan macromolecule 1 (see Ref. 23) is (1→4) β D mannopyranan, and α D galactopyranose res idues represent single side branches. The ratio Man : Gal

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Silver-containing nanocomposites based on galactomannan and carrageenan: synthesis, structure, and antimicrobial properties

et al. 2010

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“…There are a variety of methods for the production and stabilization of nanosized silver particles in vari ous media [7,8]. We devised a synthetic method based on the high speed thermal decomposition of silver salts in a polymer solution-melt by the "klaspol" pro cedure [1].…”

Section: Methodsmentioning

confidence: 99%

Polymer composites based on polymethylmethacrylate with silver nanoparticles, synthesis and optical properties

Muzalev

Кособудский

Kul’batskii

et al. 2012

Inorg. Mater. Appl. Res.

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“…Natural monomers and polymers are also used as nanostabilizing substances [9][10][11], and nanocomposites prepared with them exhibit a broad spectrum of biological activity.…”

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Copolymers of betulin esters and silver nanocomposites based on them

et al. 2016

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New biologically active silver nanocomposites based on the copolymer of lup-20(29)-ene-3,28-diol 28-O-vinylbenzoate with N-vinylpyrrolidone were prepared by the borohydride method. The formation of spherical nanoparticles with a mean diameter of 67 nm was confi rmed by scanning electron microscopy. The synthesized copolymers and silver nanocomposites exhibit cytotoxic activity and show promise for the development of new materials for medical purposes.Polyfunctional macromolecular compounds exhibit high performance as polymer matrices stabilizing metal nanoparticles and preventing their aggregation. The presence of functional groups of comonomers in copolymers favors their effi cient interaction with metal nanoparticles in early steps of their formation, controlling their growth, size, aggregation, and distribution in the polymer matrix and ensuring synergism of unique properties of the polymer matrix and metal nanoparticles.It is known from the literature that the particle stability is strongly infl uenced by the nature of the nanostabilizing matrix [1,2]. Highly stable hydrosols with isolated silver nanoparticles were prepared using the following matrix materials: water-soluble poly-N-vinylpyrrolidone [2-4] and its copolymer [5], 1-vinyl-1,2,4-triazole homo-and copolymers [6,7], and 2,2-diallyl-1,1,3,3-tetraethylguanidinium chloride copolymers [8].Natural monomers and polymers are also used as nanostabilizing substances [9][10][11], and nanocomposites prepared with them exhibit a broad spectrum of biological activity.This study was aimed at synthesis of copolymers of betulin С-28 esters [lup-20(29)-ene-3,28-diol 28-О-vinylacetate (BVA) and 28-О-vinylbenzoate (BVB)] with N-vinylpyrrolidone and acrylonitrile in the bulk in the presence of a radical initiator, azobis(isobutyronitrile) (AIBN), and at preparation of new water-soluble composites with silver nanoparticles stabilized with these triterpene-containing copolymers. EXPERIMENTALBetulin was prepared by the procedures described in [12].Vinylacetic (VAA) and vinylbenzoic (VBA) acids (Lancaster) were used without additional purifi cation.N-Vinylpyrrolidone (VP) (Lancaster) was dried over KОН and vacuum-distilled; the fraction with bp 65°С/1.5 mmHg, n D 20 1.5117, was used. Vinyl acetate (VA) (Lancaster) was purifi ed by distillation; the fraction with bp 72°С, n D 20 1.3951, was used.Acrylonitrile (AN) (Alfa Aesar) was purifi ed by distillation; the fraction with bp 78°С, n D 20 1.3910, was used.BVA and BVB were prepared as described in [13]. A mixture of 0.5 g (0.11 mmol) of betulin, 1.8 g (0.9 mmol) of dicyclohexylcarbodiimide (DCC), 0.28 g

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Redox reactions of arabinogalactan with silver ions and formation of nanocomposites

Cited by 34 publications

References 5 publications

Silver-containing nanocomposites based on galactomannan and carrageenan: synthesis, structure, and antimicrobial properties

Silver-containing nanocomposites based on galactomannan and carrageenan: synthesis, structure, and antimicrobial properties

Polymer composites based on polymethylmethacrylate with silver nanoparticles, synthesis and optical properties

Copolymers of betulin esters and silver nanocomposites based on them

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