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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shishatskaya E.I., Khlusov I.A., Volova T.G.
Заглавие : A hybrid PHB-hydroxyapatite composite for biomedical application: Production, in vitro and in vivo investigation
Место публикации : Journal of Biomaterials Science, Polymer Edition. - 2006. - Vol. 17, Is. 5. - С. 481-498. - ISSN 09205063 (ISSN) , DOI 10.1163/156856206776986242
Ключевые слова (''Своб.индексиров.''): biocompatibility--hydroxyapatite (ha)--phb-hydroxyapatite composite--polyhydroxyalkanoate (pha)--polyhydroxybutyrate (p(3hb))--properties--biocompatibility--differential thermal analysis--electron microscopy--free energy--interfacial energy--physical properties--surface properties--x ray analysis--biomedical application--physicochemical properties--polyhydroxyalkanoate (pha)--polyhydroxybutyrate (phb)--hydroxyapatite--hydroxyapatite--poly(3 hydroxybutyric acid)--polymer--biomaterial--hydroxybutyric acid--adhesion--animal cell--animal tissue--article--biomedicine--bone marrow cell--cell differentiation--cell growth--chemical structure--composite material--controlled study--crystallization--decomposition--electron microscopy--in vitro study--in vivo study--melting point--mouse--nonhuman--ossification--osteoblast--physical chemistry--priority journal--rat--strength--structure analysis--surface property--synthesis--temperature measurement--thermal analysis--tissue engineering--wettability--animal--biomechanics--bioremediation--bone prosthesis--cattle--cell culture--chemistry--cytology--differential scanning calorimetry--drug effect--human--materials testing--prostheses and orthoses--scanning electron microscopy--standard--wistar rat--murinae--animals--biocompatible materials--biodegradation, environmental--biomechanics--bone substitutes--cattle--cells, cultured--differential thermal analysis--durapatite--humans--hydroxybutyrates--materials testing--microscopy, electron, scanning--osteoblasts--prostheses and implants--rats--rats, wistar--surface properties
Аннотация: Samples of a hybrid composite of polyhydroxybutyrate (PHB), a biodegradable polyester, and hydroxyapatite (HA), with different PHB/HA ratios, have been prepared using mechanical-physical method. Electron microscopy, X-ray structure analysis and differential thermal analysis have been used to investigate the structure and physicochemical properties of the composite, depending on the PHB/HA ratio. The properties of the surface of the HA-loaded composite are significantly different from those of the pure polymer. As the HA percentage in the composite increases, free interface energy, the cohesive force, i.e., the strength of the adhesive bond between the composite surface and the water phase, and surface wettability increase. The HA percentage of the composite does not influence its melting temperature, but affects the temperature for the onset of decomposition: as the HA content increases from 0 to 10% (w/w), Td decreases from 260В°C to 225В°C. The degree of crystallinity of PHB/HA increases from 77% to 89% with an increase in the HA fraction from 10% to 50%. Functional properties of the composites have been investigated in vitro and in vivo. The best parameters of growth and differentiation of murine marrow osteoblasts are registered on PHB/HA samples containing 10% and 20% HA. In ectopic bone formation assay it has been proven that the hybrid PHB/HA composites can function as scaffolds and that bone tissue develops on their surface and in pores. В© VSP 2006.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ronzhin, Nikita O., Posokhina, Ekaterina D., Mikhlina, Elena, V, Mikhlin, Yuri L., Simunin, Mikhail M., Tarasova, Lyudmila S., Vorobyev, Sergey A., Bondar, Vladimir S., Ryzhkov, Ilya I.
Заглавие : A new composite material based on alumina nanofibers and detonation nanodiamonds: synthesis, characterization, and sensing application
Колич.характеристики :14 с
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-29-19078]
Место публикации : J. Nanopart. Res.: SPRINGER, 2021. - Vol. 23, Is. 9. - Ст.199. - ISSN 1388-0764, DOI 10.1007/s11051-021-05309-y. - ISSN 1572-896X(eISSN)
Примечания : Cited References:57. - This work is partially supported by the Russian Foundation for Basic Research, Project 18-29-19078 (E. V. Mikhlina, M. M. Simunin, I. Ryzhkov).
Предметные рубрики: ELECTROCHEMICAL ENERGY-STORAGE
SELECTIVE DETECTION
PHENOL DETECTION
Аннотация: The development of inexpensive, easy-to-produce, and easy-to-use analytical tools for detection of harmful and toxic substances is a relevant research problem with direct applications in environmental monitoring and protection. In this work, we propose a novel composite material based on alumina nanofibers and detonation nanodiamonds for detection of phenol in aqueous medium. The composite material was obtained by mixing an aqueous suspension of alumina nanofibers with a diameter of 10-15 nm and a length of several microns and a hydrosol of nanodiamonds with an average cluster size of 70 nm. The mechanisms underlying the interaction of these nanomaterials are clarified and the physicochemical properties of the composite are investigated. The SEM and TEM studies show that the obtained composite has a network structure, in which clusters of nanodiamonds (10-20 nm in diameter) are distributed over the surface of nanofibers. Coupling of nanomaterials occurs due to opposite signs of their zeta potentials, which results in electrostatic attraction and subsequent chemical bonding as indicated by the X-ray photoelectron spectroscopy and simultaneous thermal analysis. The bonding apparently occurs between functional groups (mainly carboxyl) on the surface of nanodiamonds and amphoteric hydroxyl groups on the surface of alumina nanofibers. The proposed composite allows an easy-to-perform colorimetric analysis for qualitative and quantitative determination of phenol in aqueous samples with linear response over a wide range of concentrations (0.5-106 mu M). Multiple tests have shown that the composite is reusable and retains its catalytic function for at least 1 year during storage at room temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shishatskaya E.I., Kamendov I.V., Starosvetsky S.I., Vinnik Y.S., Markelova N.N., Shageev A.A., Khorzhevsky V.A., Peryanova O.V., Shumilova A.A.
Заглавие : An in vivo study of osteoplastic properties of resorbable poly-3-hydroxybutyrate in models of segmental osteotomy and chronic osteomyelitis
Место публикации : Artif. Cells, Nanomed. Biotechnol. - 2014. - Vol. 42, Is. 5. - С. 344-355. - ISSN 21691401 (ISSN) , DOI 10.3109/21691401.2013.816312
Ключевые слова (''Своб.индексиров.''): 3d implants--bone substitute--histological analysis and radiography--hydroxyapatite--p3hb--polymer of 3-hydroxybutyric acid--reconstructive osteogenesis--3-hydroxybutyric acid--bone substitutes--histological analysis--osteogenesis--p3hb--hydroxyapatite
Аннотация: A series of 3D implants and filling materials prepared from powdered biodegradable polymers, polyhydroxyalkanoates (PHAs), have been designed for the purposes of reparative osteogenesis. The 3D implants are made of resorbable polymer of hydroxybutyric acid (poly-3-hydroxybutyrate, P3HB) and a composite of this polymer with hydroxyapatite (HA) (P3HB/HA). The properties of the implants were studied in vivo in a model of segmental osteotomy and compared with commercial material Bio-Oss®. All implants containing P3HB as the main component facilitate reconstructive osteogenesis. P3HB and P3HB/HA show pronounced osteoplastic properties; their in vivo degradation is slow and corresponds to the growth of a new bone tissue, facilitating normal reparative osteogenesis. Also, powdered P3HB and P3HB/tienam can be used as filling materials for osteoplasty of bone cavities infected by Staphylococcus aureus. Biodegradable 3D implants and P3HB-based filling materials show pronounced osteoplastic properties and degrade in vivo at a slow rate, enabling normal reparative osteogenesis.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T. G., Shumilova A. A., Shidlovskiy I. P., Nikolaeva E. D., Sukovatiy A. G., Vasiliev A. D., Shishatskaya E. I.
Заглавие : Antibacterial properties of films of cellulose composites with silver nanoparticles and antibiotics
Место публикации : Polym Test: Elsevier Ltd, 2018. - Vol. 65. - С. 54-68. - ISSN 01429418 (ISSN) , DOI 10.1016/j.polymertesting.2017.10.023
Ключевые слова (''Своб.индексиров.''): antibacterial activity--antibiotics--bacterial cellulose--composites--properties--silver nanoparticles--antibiotics--atoms--boron carbide--cell culture--cellulose--cellulose films--composite materials--escherichia coli--materials testing apparatus--metal nanoparticles--nanocomposite films--nanoparticles--scanning electron microscopy--silver compounds--spectrum analysis--synthesis (chemical)--tensile testing--water pollution--x ray analysis--anti-bacterial activity--antibacterial properties--bacterial cellulose--mechanical characteristics--properties--silver nanoparticles--structure and properties--tensile testing machines--silver--antibiotics--cellulose--composites--properties--silver
Аннотация: The present study describes production of bacterial cellulose composites with silver nanoparticles and antibiotics and compares their properties. Bacterial cellulose (BC) composites synthesized in the culture of the strain of acetic acid bacterium Komagataeibacter xylinus VKPM B-12068 with silver nanoparticles, BC/AgNps, were produced hydrothermally, under different AgNO3 concentrations (0.0001, 0.001, and 0.01 M) in the reaction medium. The presence of silver in the BC/AgNp composites was confirmed by elemental analysis conducted using scanning electron microscopy with a system of X-ray spectral analysis. Analysis showed that the average atomic number of silver particles in composite samples depended on the concentration of AgNO3: as AgNO3 concentration in the reaction solution was increased, silver content in the composites increased from 0.044 to 0.37 mg/cm2. BC composites with amikacin and ceftriaxone were prepared by immersing dry BC films in solutions containing different concentrations of the antibiotics. The surface structure and properties and physicochemical and mechanical characteristics of composites were investigated using SEM, DSC, X-ray analysis, the system for measuring water contact angles, and electromechanical tensile testing machine. The disk-diffusion method and the shake-flask culture method used in this study showed that all experimental composites had pronounced antibacterial activity against E. coli, Ps. eruginosa, K. pneumoniae, and St. aureus, and the BC/antibiotic composites were more active than BC/AgNp ones; S. aureus was the most susceptible to the effect of BC composites. No potential cytotoxicity was detected in any of the BC/AgNp composites in the NIH 3T3 mouse fibroblast cell culture, in contrast to the BC/antibiotic composites. These results suggest that BC composites constructed in the present study hold promise as dressings for managing wounds, including contaminated ones. © 2017 Elsevier Ltd
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T. G., Shumilova A. A., Nikolaeva E. D., Kirichenko A. K., Shishatskaya E. I.
Заглавие : Biotechnological wound dressings based on bacterial cellulose and degradable copolymer P(3HB/4HB)
Место публикации : Int. J. Biol. Macromol.: Elsevier B.V., 2019. - Vol. 131. - С. 230-240. - ISSN 01418130 (ISSN) , DOI 10.1016/j.ijbiomac.2019.03.068
Примечания : Cited By :1
Ключевые слова (''Своб.индексиров.''): bacterial cellulose--composites--polyhydroxyalkanoates--3 hydroxybutyric acid 4 hydroxybutyric acid copolymer--actovegin--bacterial cellulose--cellulose--collagen type 1--copolymer--cytokeratin 10--cytokeratin 14--solcoseryl--unclassified drug--angiogenesis--animal cell--animal experiment--animal model--animal tissue--biochemical analysis--biocompatibility--burn--cell growth--controlled study--cutaneous parameters--differential scanning calorimetry--drug release--elemental analysis--female--fibroblast--histopathology--in vitro study--in vivo study--inflammation--mechanics--nonhuman--rat--review--wound healing--wound planimetry--x ray analysis
Аннотация: Hybrid wound dressings have been constructed using two biomaterials: bacterial cellulose (BC) and copolymer of 3-hydroxybutyric and 4-hydroxybutyric acids [P(3HB/4HB)] – a biodegradable polymer of microbial origin. Some of the experimental membranes were loaded with drugs promoting wound healing and epidermal cells differentiated from multipotent adipose-derived mesenchymal stem cells. A study has been carried out to investigate the structure and physical/mechanical properties of the membranes. The in vitro study showed that the most effective scaffolds for growing fibroblasts were composite BC/P(3HB/4HB) films loaded with actovegin. Two types of the experimental biotechnological wound dressings – BC/P(3HB/4HB)/actovegin and BC/P(3HB/4HB)/fibroblasts – were tested in vivo, on laboratory animals with model third-degree skin burns. Wound planimetry, histological examination, and biochemical and molecular methods of detecting factors of angiogenesis, inflammation, type I collagen, and keratin 10 and 14 were used to monitor wound healing. Experimental wound dressings promoted healing more effectively than VoskoPran – a commercial wound dressing. © 2019
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goreva A.V., Shishatskaya E.I., Volova T.G., Sinskey A.J.
Заглавие : Characterization of polymeric microparticles based on resorbable polyesters of oxyalkanoic acids as a platform for deposition and delivery of drugs
Место публикации : Polym. Sci. Ser. A: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2012. - Vol. 54, Is. 2. - С. 94-105. - 12. - ISSN 0965-545X, DOI 10.1134/S0965545X12020022
Примечания : Cited References: 33. - This work was supported by the program for Support of Leading Scientific Schools of the Russian Federation (project no. 11.G34.31.0013.2010, Biotechnology of New Biomaterials) and the program of integrated studies of the Presidium of the Siberian Branch, Russian Academy of Sciences (project no. 93).
Предметные рубрики: IN-VITRO RELEASE
POLYHYDROXYBUTYRATE MICROSPHERES
BLENDS
RIFAMPICIN
BIOCOMPATIBILITY
DEGRADATION
FORMULATION
COMPOSITE
CARRIERS
MODEL
Аннотация: The effect of the preparation technique (chemical composition of a polymer, type and method of emulsion mixing, and molecular mass of a drug) on the yield, structure, and size of microparticles obtained from resorbable polyesters of microbiological origin, polyhydroxyalkanoates, is studied. It is found that the concentration of the polymer solution and the method of emulsion mixing are the most significant factors affecting the diameter of microparticles based on polyhydroxyalkanoates; the surface structure of particles depends to a higher extent on the chemical composition of the polymer. The family of microparticles from 100-200 nm to 50-70 mu m in diameter is synthesized. It is shown that the rate of drug release from microparticles in vitro into the medium is higher in the case of 3-hydroxybutyrate copolymers with 3-hydroxyvalerate than in the case of the homopolymer of 3-hydroxybutyrate. This parameter increases with the content of 3-hydroxyvalerate units in the copolymer and the porosity and mass fraction of the drug in particles with a decrease in their sizes. For in vitro systems containing a phosphate buffer, variation in the preparation parameters makes it possible to obtain microparticles with various characteristics suitable for deposition of drugs. For microparticles obtained from polyhydroxyalkanoates and having different diameters, the mathematical description of the kinetics of drug release from the polymer matrix is provided.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boyandin A. N., Kazantseva E. A., Varygina D. E., Volova T. G.
Заглавие : Constructing Slow-Release Formulations of Ammonium Nitrate Fertilizer Based on Degradable Poly(3-hydroxybutyrate)
Место публикации : J. Agric. Food Chem.: American Chemical Society, 2017. - Vol. 65, Is. 32. - С. 6745-6752. - ISSN 00218561 (ISSN) , DOI 10.1021/acs.jafc.7b01217
Ключевые слова (''Своб.индексиров.''): ammonium nitrate--degradable poly-3-hydroxybutyrate--embedding--fillers--nitrogen fertilizers--tablets--chemical contamination--ecology--ecosystems--fertilizers--fillers--nitrates--plastic coatings--ammonium nitrate--ammonium nitrate fertilizers--embedding--in-laboratory experiments--poly-3-hydroxybutyrate--slow release fertilizers--tablets--wheat (triticum aestivum l.)--nitrogen fertilizers
Аннотация: The present study describes construction and investigation of experimental formulations of ammonium nitrate embedded in a matrix of degradable natural polymer poly-3-hydroxybutyrate [P(3HB)] and P(3HB) blended with wood flour shaped as tablets, some of them coated with P(3HB). Kinetics of ammonium release into soil as dependent on the composition of the polymer matrix was investigated in laboratory experiments. The rates of fertilizer release from formulations coated with a biopolymer layer were considerably (two months or longer) slower than the rates of fertilizer release from uncoated formulations, while release from polymer and composite (polymer/wood flour) formulations occurred with comparable rates. The use of the experimental formulations in laboratory ecosystems with wheat (Triticum aestivum L.) was more effective than application of free ammonium nitrate. The advantage of the slow-release fertilizer formulations is that they are buried in soil together with the seeds, and the fertilizer remains effective over the first three months of plant growth. The use of such slow-release formulations will reduce the amounts of chemicals released into the environment, which will curb their accumulation in food chains of ecosystems and mitigate their adverse effects on the biosphere. © 2017 American Chemical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boyandin A. N., Zhila N. O., Kiselev E. G., Volova T. G.
Заглавие : Constructing Slow-Release Formulations of Metribuzin Based on Degradable Poly(3-hydroxybutyrate)
Место публикации : J. Agric. Food Chem. - 2016. - Vol. 64, Is. 28. - С. 5625-5632. - ISSN 00218561 (ISSN) , DOI 10.1021/acs.jafc.5b05896
Ключевые слова (''Своб.индексиров.''): controlled release--degradable poly(3-hydroxybutyrate)--herbicide--metribuzin--release kinetics--polyethylene glycols--weed control--controlled release--environmental release--herbicide release--laboratory system--matrix formulation--metribuzin--poly-3-hydroxybutyrate--release kinetics--herbicides
Аннотация: Experimental formulations of herbicide metribuzin embedded in matrices of degradable natural polymer poly(3-hydroxybutyrate) (P3HB) and its composites with poly(ethylene glycol) (PEG), poly-?-caprolactone (PCL), and wood powder have been prepared in the form of pressed pellets containing 75% polymeric basis (pure P3HB or its composite with a second component at a ratio of 7:3) and 25% metribuzin. Incubation of formulations in soil laboratory systems led to the degradation of the matrix and herbicide release. The most active release of metribuzin (about 60% of the embedded herbicide over 35 days) was detected for the P3HB/PEG carrier compared to the P3HB, P3HB/wood, and P3HB/PCL forms (30-40%). Thus, the study shows that herbicide release can be controlled by the matrix formulation. Metribuzin formulations exerted a significant herbicidal effect on the plant Agrostis stolonifera, used as a weed plant model. Application of these long-term formulations will make it possible to reduce environmental release of chemicals, which will restrict the rate of their accumulation in trophic chains of ecosystems and abate their adverse effects on the biosphere. © 2016 American Chemical Society.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Stolyar S. V., Chekanova L. A., Yaroslavtsev R. N., Ladygina V. P., Tirranen L. S.
Заглавие : Effect of nanoparticles in growth of test - Bacteria
Место публикации : Journal of Physics: Conference Series: Institute of Physics Publishing, 2019. - Vol. 1399: International Scientific Conference on Applied Physics, Information Technologies and Engineering 2019, APITECH 2019 (25 September 2019 through 27 September 2019, ) Conference code: 156053, Is. 2. - Ст.022029. - , DOI 10.1088/1742-6596/1399/2/022029
Аннотация: Confident effect of five magnetic composite nanoparticles (FeP@Ag, FeP@Pd, CoP, NiP, Fe2O3@A) on growth of test bacteria colonies (Acinetobacter baumannii, scherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Staphylococcus aureus) in five replicates each is considered. Reliable inhibitors of colonies of all five test bacteria were nanoparticles FeP@Ag. CoP nanoparticles are reliable inhibitors of growth of 4 test bacteria (except for test bacteria Escherichia oli). NiP nanoparticles are reliable inhibitors of growth of 2 test bacteria: Escherichia oli and Klebsiella pneumoniae. Bacteria Escherichia oli were most sensitive to the effect of magnetic nanoparticles; and bacteria Pseudomonas aeruginosa and Staphylococcus aureus were most resistant to the effect of magnetic nanoparticles. The prospects of the method are in the possibility of multiple reuse of the magnetic particles with antimicrobial properties for bacterial decontamination of the studied sources of water and removal of magnetic nanoparticles from the treated liquids by electromagnet. The method can find use in water treatment facilities for household, Industrial and medical wastes. © Published under licence by IOP Publishing Ltd.
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10.

Вид документа : Статья из сборника (выпуск монографической серии)
Шифр издания :
Автор(ы) : Stolyar, S., V, Chekanova L. A., Yaroslavtsev R. N., Ladygina V. P., Tirranen L. S.
Заглавие : Effect of nanoparticles in growth of test - bacteria
Колич.характеристики :6 с
Место публикации : INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED PHYSICS, INFORMATION: IOP PUBLISHING LTD, 2019. - Vol. 1399: International Scientific Conference on Applied Physics, Information (SEP 25-27, 2019, Siberian Fed Univ, Polytechn Inst, Krasnoyarsk, RUSSIA). - Ст.022029. - (Journal of Physics Conference Series). - , DOI 10.1088/1742-6596/1399/2/022029
Примечания : Cited References:10
Аннотация: Confident effect of five magnetic composite nanoparticles (FeP@Ag, FeP@Pd, CoP, NiP, Fe2O3@AF) on growth of test bacteria colonies (Acinetobacter baumannii, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Staphylococcus aureus) in five replicates each is considered. Reliable inhibitors of colonies of all five test bacteria were nanoparticles FeP@Ag. CoP nanoparticles are reliable inhibitors of growth of 4 test bacteria (except for test bacteria Escherichia coli). NiP nanoparticles are reliable inhibitors of growth of 2 test bacteria: Escherichia coli and Klebsiella pneumoniae. Bacteria Escherichia coli were most sensitive to the effect of magnetic nanoparticles; and bacteria Pseudomonas aeruginosa and Staphylococcus aureus were most resistant to the effect of magnetic nanoparticles. The prospects of the method are in the possibility of multiple reuse of the magnetic particles with antimicrobial properties for bacterial decontamination of the studied sources of water and removal of magnetic nanoparticles from the treated liquids by electromagnet. The method can find use in water treatment facilities for household, Industrial and medical wastes.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Joseph, Blessy, Sam, Rubie Mavelil, Balakrishnan, Preetha, Maria, Hanna J., Gopi, Sreeraj, Volova, Tatiana, Fernandes, Susana C. M., Thomas, Sabu
Заглавие : Extraction of Nanochitin from Marine Resources and Fabrication of Polymer Nanocomposites: Recent Advances
Колич.характеристики :37 с
Коллективы : Government of the Russian Federation [074-02-2018-328, 220]; "Investissements d'Avenir" French programFrench National Research Agency (ANR) [ANR-16-IDEX-0002]; Region Nouvelle-AquitaineRegion Nouvelle-Aquitaine; Communaute d'Agglomeration du Pays Basque, France
Место публикации : Polymers: MDPI, 2020. - Vol. 12, Is. 8. - Ст.1664. - ISSN 2073-4360(eISSN), DOI 10.3390/polym12081664
Примечания : Cited References:128. - This study was financially supported by project "Agro preparations of the new generation: a strategy of construction and realization" (agreement number 074-02-2018-328) in accordance with resolution number 220 of the Government of the Russian Federation of 9 April 2010, "On measures designed to attract leading scientists to the Russian institutions of higher learning." S.C.M.F. is the recipient of an E2S UPPA Research Partnership Chair (MANTA: Marine Materials) supported by the "Investissements d'Avenir" French program managed by ANR (ANR-16-IDEX-0002), the Region Nouvelle-Aquitaine and the Communaute d'Agglomeration du Pays Basque, France.
Предметные рубрики: NATURAL-RUBBER NANOCOMPOSITES
ELECTROSPUN PVDF MEMBRANE
ALPHA-CHITIN
Аннотация: Industrial sea food residues, mainly crab and shrimp shells, are considered to be the most promising and abundant source of chitin. In-depth understanding of the biological properties of chitin and scientific advancements in the field of nanotechnology have enabled the development of high-performance chitin nanomaterials. Nanoscale chitin is of great economic value as an efficient functional and reinforcement material for a wide range of applications ranging from water purification to tissue engineering. The use of polymers and nanochitin to produce (bio) nanocomposites offers a good opportunity to prepare bioplastic materials with enhanced functional and structural properties. Most processes for nanochitin isolation rely on the use of chemical, physical or mechanical methods. Chitin-based nanocomposites are fabricated by various methods, involving electrospinning, freeze drying, etc. This review discusses the progress and new developments in the isolation and physico-chemical characterization of chitin; it also highlights the processing of nanochitin in various composite and functional materials.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karabutov A.V., Frolov V.D., Konov V.I., Ralchenko V.G., Gordeev S.K., Belobrov P.I.
Заглавие : Low-field electron emission of diamond/pyrocarbon composites
Место публикации : Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures. - 2001. - Vol. 19: 13th International Vaccum Microelectronics Conference (14 August 2000 through 17 August 2000, Guangzhou, Is. 3. - С. 965-970. - ISSN 10711023 (ISSN) , DOI 10.1116/1.1368669
Ключевые слова (''Своб.индексиров.''): carbon nanotubes--chemical bonds--chemical vapor deposition--composite materials--diamond films--electric conductivity--electron emission--electron energy levels--hysteresis--interfaces (materials)--raman scattering--semiconducting diamonds--semiconductor quantum wells--transmission electron microscopy--x ray diffraction analysis--x ray photoelectron spectroscopy--pyrocarbon composites--nanostructured materials
Аннотация: The properties of field electron emission for diamond/pyrocarbon nanocomposites produced from diamond particles surrounded by a pyrocarbon matrix were studied. Low-threshold emissions at fields of ?1 V/?m with no activation or hysterisis in the current versus voltage (I/V) behaviour were observed for the materials. Scanning tunneling-field emission microscopy was used to study the mechanisms of low-field electron emission from the composites, and a model based on quantum well effect at the diamond/graphite interface was proposed and discussed.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Surmenev R. A., Chernozem R. V., Syromotina D. S., Oehr C., Baumbach T., Krause B., Boyandin A. N., Dvoinina L. M., Volova T. G., Surmeneva M. A.
Заглавие : Low-temperature argon and ammonia plasma treatment of poly-3-hydroxybutyrate films: Surface topography and chemistry changes affect fibroblast cells in vitro
Место публикации : Eur Polym J: Elsevier Ltd, 2019. - Vol. 112. - С. 137-145. - ISSN 00143057 (ISSN) , DOI 10.1016/j.eurpolymj.2018.12.040
Ключевые слова (''Своб.индексиров.''): cell adhesion--dielectric barrier discharge--plasma treatment--surface etching--wetting behaviour--ammonia--argon--cell adhesion--cell culture--chemical modification--contact angle--dielectric materials--electric discharges--fibroblasts--mammals--nitrogen plasma--plasma applications--surface roughness--surface treatment--temperature--topography--ammonia plasma treatment--dielectric barrier discharges--different proportions--plasma treatment--poly-3-hydroxybutyrate--poly3-hydroxybutyrate (phb)--surface etching--wetting behaviour--wetting
Аннотация: Poly-3-hydroxybutyrate (PHB) films were plasma-treated using pure NH3, pure Ar or mixtures of the two different proportions (20%, 30%, 40%, 50%, 70% NH3 in Ar). Surface chemistry and surface topography changes of PHB films were observed after plasma processing in all plasma regimes. The XPS results confirmed the absence of chemical modification in the case of pure Ar plasma treatment. Nitrogen-containing groups (e.g., N–C[dbnd]O) were detected on the surfaces of P3HB films treated with NH3-containing plasma. The surfaces of the untreated P3HB films were hydrophobic, and plasma treatment turned the surfaces hydrophilic, irrespective of the treatment. A significant decrease in the contact angle and an increase in the free surface energy were observed. An insignificant surface ageing effect was observed when P3HB samples were exposed to air for 10 days. In NIH 3T3 mice fibroblast cells, cell adhesion was significantly improved after plasma treatment in an Ar atmosphere, which is likely related to the fact that there was a surface ? potential of 88.6 mV at neutral pH, causing a cleavage of the polymer chains and an increase in surface roughness. © 2018 Elsevier Ltd
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shershneva, Anna, Murueva, Anastasiya, Nikolaeva, Elena, Shishatskaya, Ekaterina, Volova, Tatiana
Заглавие : Novel spray-dried PHA microparticles for antitumor drug release
Колич.характеристики :12 с
Коллективы : Russian Academy of Sciences [AAAA-A17- 117013050028-8]
Место публикации : Dry. Technol.: TAYLOR & FRANCIS INC, 2018. - Vol. 36, Is. 11. - С. 1387-1398. - ISSN 0737-3937, DOI 10.1080/07373937.2017.1407940. - ISSN 1532-2300(eISSN)
Примечания : Cited References:67. - This work was supported by the state budget allocated to the fundamental research at the Russian Academy of Sciences: [Project no. AAAA-A17- 117013050028-8].
Предметные рубрики: DRYING METHOD
IN-VITRO
BIODEGRADABLE NANOPARTICLES
ORAL
Ключевые слова (''Своб.индексиров.''): 5-fluorouracil--efficiency--microparticles--paclitaxel--polyhydroxyalkanoates--spray-drying
Аннотация: The production of poly-3-hydroxybutyrate (P3HB) and poly-3-hydroxybutyrate/polyethylene glycol (PEG)-based microparticles, loaded with antitumor drugs paclitaxel (PTX) and 5-Fluorouracil (5-FU) by spray-drying technique, was investigated. The average diameter of microparticles was found to be 3.4 +/- 0.5 pm and zeta potential was about -44 mV. The addition of surfactant PEG did not show any effect on the morphological characteristics of the particles. But the chemical structure of drug influenced on the properties. Microparticles had heterogeneous pores on the surface when the hydrophobic PTX was encapsulated. It was established that the addition of surfactant positively influenced on the properties of particles and led to the loading of 5-FU directly into the matrix. This is confirmed by the results of electron microscopy and dynamics of drug release in vitro. As a whole, the release profiles of PTX and 5-FU from composite P3HB/PEG microparticles were less than from P3HB microparticles. The results of the morphological evaluation of Hela cells demonstrated that the use of cytostatic drugs loaded in P3HB microparticles induces morphological changes associated with apoptosis (chromatin condensation, core fragmentation, margination of nucleus). Thus, the obtained results can serve as the basis for the development of new antitumor drugs of prolonged action, intended for various modes of administration.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhanova A. A., Murzova A. E., Boyandin A. N., Kiselev E. G., Sukovatyi A. G., Kuzmin A. P., Shabanov, A., V
Заглавие : Poly-3-hydroxybutyrate/chitosan composite films and nonwoven mats
Колич.характеристики :10 с
Коллективы : Ministry of Education and Science of the Russian FederationMinistry of Education and Science, Russian Federation [FEFE-2020-0015]
Место публикации : Int. J. Biol. Macromol.: ELSEVIER, 2020. - Vol. 165. - С. 2947-2956. - ISSN 0141-8130, DOI 10.1016/j.ijbiomac.2020.10.177. - ISSN 1879-0003(eISSN)
Примечания : Cited References:54. - This study was carried out as part of the State Assignment of the Ministry of Education and Science of the Russian Federation to the team of the research laboratory "Intellectual Materials and Structures" within the project "Development of the methods for modifying polymer matrices containing particulate and fibrous fillers of various origins for creating smart multifunctional materials" (subject number FEFE-2020-0015).
Предметные рубрики: BIODEGRADABLE POLY-3-HYDROXYBUTYRATE
BIOMEDICAL APPLICATIONS
BACTERIAL
Аннотация: Composite films and nonwoven mats of the poly-3-hydroxybutyrate and chitosan natural polymers were prepared and investigated. DSC and FTIR techniques were used to confirm that P(3HB) blending with chitosan resulted in a decrease in P(3HB) crystallinity to 47% and 62% in the films and nonwoven mats, respectively. Scanning electron microscopy showed that addition of chitosan induced changes in the surface morphology of the composite films and a reduction in the diameter of ultrafine fibers in the nonwoven mats from 800 nm to 460 nm. The values of water contact angle for films (53 degrees) and nonwoven mats (50.6 degrees) suggested that chitosan enhanced hydrophilic properties and moisture absorption capacity of the composite materials. On the other hand, P(3HB) showed its reinforcing ability and improved the physical/mechanical properties of chitosan. The work included studies of in vitro biodegradation of the composite specimens and their ability to maintain cell growth and attachment in NIH 3T3 fibroblast culture. (c) 2020 Published by Elsevier B.V.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhanova A. A., Murzova A. E., Boyandin A. N., Kiselev E. G., Sukovatyi A. G., Kuzmin A. P., Shabanov A. V.
Заглавие : Poly-3-hydroxybutyrate/chitosan composite films and nonwoven mats
Место публикации : Int. J. Biol. Macromol.: Elsevier B.V., 2020. - Vol. 165. - С. 2947-2956. - ISSN 01418130 (ISSN), DOI 10.1016/j.ijbiomac.2020.10.177
Аннотация: Composite films and nonwoven mats of the poly-3-hydroxybutyrate and chitosan natural polymers were prepared and investigated. DSC and FTIR techniques were used to confirm that P(3HB) blending with chitosan resulted in a decrease in P(3HB) crystallinity to 47% and 62% in the films and nonwoven mats, respectively. Scanning electron microscopy showed that addition of chitosan induced changes in the surface morphology of the composite films and a reduction in the diameter of ultrafine fibers in the nonwoven mats from 800 nm to 460 nm. The values of water contact angle for films (53°) and nonwoven mats (50.6°) suggested that chitosan enhanced hydrophilic properties and moisture absorption capacity of the composite materials. On the other hand, P(3HB) showed its reinforcing ability and improved the physical/mechanical properties of chitosan. The work included studies of in vitro biodegradation of the composite specimens and their ability to maintain cell growth and attachment in NIH 3T3 fibroblast culture. © 2020
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ronzhin N. O., Posokhina E. D., Mikhlina E. V., Simunin M. M., Nemtsev I. V., Ryzhkov I. I., Bondar V. S.
Заглавие : Production of a Composite Based on Alumina Nanofibers and Detonation Nanodiamonds for Creating Phenol Indication Systems
Место публикации : Dokl. Chem.: Pleiades Publishing, 2019. - Vol. 489, Is. 1. - С. 267-271. - ISSN 00125008 (ISSN), DOI 10.1134/S001250081911003X
Аннотация: Abstract: A composite of alumina nanofibers (ANF) and modified detonation nanodiamonds (MDND) was produced by mixing aqueous suspensions of the components in a weight ratio of 5 : 1 with subsequent incubation of the mixture for 15 min at 32°C. It was assumed that the formation of the composite is ensured by the difference of the zeta potentials of the components, which is negative for MDND and positive for ANF. Vacuum filtration of the mixture through a fluoroplastic filter (pore diameter 0.6 ?m) formed disks 40 mm in diameter, which were then heat-treated at 300°C to impart structural stability to the composite. Scanning electron microscopy detected that the obtained composite has a network structure, in which MDND particles are distributed over the surface of ANF. It was determined that the MDND particles incorporated in the composite catalyze the phenol–4-aminoantipyrine–H2O2 oxidative azo coupling reaction to form a colored product (quinoneimine). The applicability of the composite to repeated phenol detection in aqueous samples was demonstrated. © 2019, Pleiades Publishing, Ltd.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ronzhin N. O., Posokhina E. D., Mikhlina E. V., Simunin M. M., Nemtsev I. V., Ryzhkov I. I., Bondar V. S.
Заглавие : Production of a Composite Based on Alumina Nanofibers and Detonation Nanodiamonds for Creating Phenol Indication Systems
Колич.характеристики :5 с
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-29-19078 mk]
Место публикации : Dokl. Chem.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2019. - Vol. 489. - С. 267-271. - ISSN 0012-5008, DOI 10.1134/S001250081911003X. - ISSN 1608-3113(eISSN)
Примечания : Cited References:13. - This work was supported by the Russian Foundation for Basic Research (project no. 18-29-19078 mk).
Предметные рубрики: NANOPARTICLES
GRAPHENE
Аннотация: A composite of alumina nanofibers (ANF) and modified detonation nanodiamonds (MDND) was produced by mixing aqueous suspensions of the components in a weight ratio of 5 : 1 with subsequent incubation of the mixture for 15 min at 32 degrees C. It was assumed that the formation of the composite is ensured by the difference of the zeta potentials of the components, which is negative for MDND and positive for ANF. Vacuum filtration of the mixture through a fluoroplastic filter (pore diameter 0.6 mu m) formed disks 40 mm in diameter, which were then heat-treated at 300 degrees C to impart structural stability to the composite. Scanning electron microscopy detected that the obtained composite has a network structure, in which MDND particles are distributed over the surface of ANF. It was determined that the MDND particles incorporated in the composite catalyze the phenol-4-aminoantipyrine-H2O2 oxidative azo coupling reaction to form a colored product (quinoneimine). The applicability of the composite to repeated phenol detection in aqueous samples was demonstrated.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shidlovskiy I. P., Shumilova A. A., Shishatskaya E. I., Volova T. G.
Заглавие : Properties of Bacterial Cellulose Composites with Silver Nanoparticles
Место публикации : Biophysics: Pleiades Publishing, 2018. - Vol. 63, Is. 4. - С. 519-525. - ISSN 00063509 (ISSN) , DOI 10.1134/S0006350918040188
Ключевые слова (''Своб.индексиров.''): :bacterial cellulose--antibacterial activity--composites--hydrothermal synthesis--silver nanoparticles
Аннотация: Abstract: Composites of bacterial cellulose, which were synthesized in a culture of the strain of acetic acid bacteria Komagataeibacter xylinus VKPM B-12068, with silver nanoparticles were produced hydrothermally by varying the concentrations of AgNO3 in the medium. The presence of silver in the composites was confirmed by elemental analysis. An increase in the number of silver nanoparticles in the composite from 1.08 to 9.1 wt % (from 0.044 to 0.370 mg/cm2) was shown under increasing AgNO3 concentration in the medium from 0.0001 to 0.01 M. The structure, properties of the surface, and the physicochemical properties of the composites depending on the silver content were investigated using scanning electron microscopy, differential scanning calorimetry, X-ray diffraction, and a water contact-angle measurement system. Using the disk-diffusion method, it was shown that the resulting composites have a pronounced antibacterial activity against pathogenic microflora E. coli, Ps. eruginosa, and St. aureus. © 2018, Pleiades Publishing, Inc.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gordeev S.K., Konopleva R.F., Chekanov V.A., Korchagina S.B., Belyaev S.P., Golosovskii I.V., Denisov I.A., Belobrov P.I.
Заглавие : Specific features in the change of electrical resistivity of carbon nanocomposites based on nanodiamonds under neutron irradiation
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2013. - Vol. 55, Is. 7. - С. 1480-1486. - 7. - ISSN 1063-7834, DOI 10.1134/S1063783413070147
Примечания : Cited References: 24. - This study was supported by the Ministry of Education and Science of the Russian Federation (state contract nos. 14.518.11.7028 and 16.518.11.7034) and the Russian Foundation for Basic Research (project no. 10-02-00576).
Предметные рубрики: NANOPARTICLES
Аннотация: The physical properties of bulk composite materials consisting of nanodiamond, pyrolytic carbon, and nanopores were investigated. Samples were irradiated in a channel of the reactor by fast neutrons (E 0.5MeV) in ampoules with helium and in an aqueous medium. The dependences of the electrical transport properties of materials with different compositions on the dose of irradiation with fast neutrons were studied. A nonmonotonic change in the electrical resistivity with an increase in the neutron fluence was revealed. Possible explanations were offered for the observed dependence of the electrical resistivity on the neutron fluence, in particular, those related to the physical processes occurring in surface states of the three-phase system of the nanocomposite.
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