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Общее количество найденных документов : 38
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 1-10    11-20   21-30   31-38 
1.
Инвентарный номер: нет.
   

   
    Peptide ligands on the PEGylated nanoparticle surface and human serum composition are key factors for the interaction between immune cells and nanoparticles / A. G. Pershina, A. M. Demin, N. A. Perekucha [et al.] // Colloids and Surfaces B: Biointerfaces. - 2023. - Vol. 221. - P112981
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The architecture of a nanoparticles' surface formed due to a modification with a ligand and protein corona formation in biofluids is critical for interactions with cells in vivo. Here we studied interactions of immune cells with magnetic nanoparticles (MNPs) covalently modified with polyethylene glycol (PEG) and their counterparts conjugated with peptides: a pH (low) insertion peptide (pHLIP) and cycloRGD as a targeting ligand in human serum. The conjugation of MNPs-PEG with pHLIP, but not with cycloRGD, enhanced the association of these particles with mononuclear phagocytic cells in vitro and in vivo. We did not find a clear difference in protein corona composition between the pHLIP-modified and parental PEGylated nanoparticles. Analysis of the effect of autologous human serum on MNP uptake by monocytes showed that the efficiency of endocytosis varies among healthy donors and depends on intrinsic properties of serum. Nevertheless, using classic blood, coagulation, biochemical tests, and anti-PEG IgG serum level, we failed to identify the cause of the observed interdonor variation. These individual differences should be taken into consideration during testing of nanotherapeutics.

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2.
Инвентарный номер: нет.
   

   
    Combination of fluorescent and spin labels: a powerful method for the optimization of hydrophilic membranes for the separation of oil-in-water emulsions / R. S. Alqubelat, A. D. Kuznetsova, D. O. Antonov, M. A. Mironov // Chimica Techno Acta. - 2023. - Vol. 10, № 4. - P202310415
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
FLUORESCENT LABEL -- SPIN LABEL -- OIL-IN-WATER EMULSION
Аннотация: A new method for assessing the quality of fibre coating based on a combination of fluorescence microscopy and electron paramagnetic resonance is presented in this work. An influence of the carboxymethylcellulose/polyvinylamine gel preparation method on the mobility of the spin label was established. The mobility of the spin label changes from 3.5 ns in the case of a polyvinylamine solution to 12.8 ns in the case of a cross-linked gel on the surface of the glass fibre. A qualitative relationship was found between the mobility of the spin label in the gel applied to the glass fibre and the rate of spreading of crude oil over its surface. This method can be used to make membranes for the separation of water-in-oil emulsions.

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3.
Инвентарный номер: нет.
   

   
    Individual iron(III) glycerolate: synthesis and characterisation / T. G. Khonina, E. Y. Nikitina, D. S. Tishin [et al.] // RSC Advances. - 2022. - Vol. 12, № 7. - P4042-4046
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Iron(II) and iron(III) salts of strong acids form iron glycerolates on heating at 180 °C with glycerol in the presence of an equivalent amount of alkali. Individual iron(III) glycerolate was obtained for the first time. When Fe3O4 magnetic nanoparticles were heated with glycerol, an iron(III) glycerolate shell was formed on their surface.

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4.
Инвентарный номер: нет.
   
   F 33

   
    Features of sorption preconcentration of noble metal ions with sulfoethylated amino polymers / L. M. Alifkhanova, K. Y. Lopunova, A. A. Marchuk [и др.] // Russian journal of inorganic chemistry. - 2021. - Vol. 66, № 6. - С. 909-915
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Dependencies for the sorption of palladium(II), gold(III), and platinum(IV) chloro complexes from individual and binary solutions with sorbents based on sulfoethylated polyallylamine and poly(aminostyrene) have been obtained. It has been found that predominant sorption mechanism is complexation with functional groups of the sorbents for gold(III) and palladium(II) and ion exchange for platinum(IV). It has been shown that increase in the sulfoethylation degree of aminopolymer matrix leads to decrease of platinum(IV) sorption and therefore, to increase in palladium(II) sorption selectivity relative to this ion. This effect is the largest for the sorbents based on polyallylamine. The conditions of quantitative desorption of the studied metals from sorbent surface have been determined. The sorption of gold(III) by the sorbent based on polyallylamine has been shown to be complicated by gold(III) reduction in sorbent phase.

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5.
Инвентарный номер: нет.
   
   I-60

   
    Influence of the structure of the aminoalkyl group in polysiloxane on the selectivity of its interaction with metal ions / A. S. Kholmogorova, E. A. Fedoseeva, L. K. Neudachina [et al.] // Russian Journal of Applied Chemistry. - 2021. - Vol. 94, № 4. - P478-485
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Polysiloxanes containing nonchelating 3-aminopropyl and chelating N-(2-aminoethyl)-3-aminopropyl groups with the degree of functionalization of 28 and 24%, respectively, were prepared by sol–gel synthesis. The polysiloxanes obtained showed comparable activity in sorption of Pd(II), Pt(IV), Fe(III), Cd(II), Zn(II), Co(II), Ni(II), Cu(II), Mn(II), Pb(II), Ca(II), and Mg(II) ions from model multicomponent solutions. At pH 3,3-aminopropylpolysiloxane selectively takes up platinoid ions. The chelating structure of N-(2-aminoethyl)-3-aminopropyl groups leads to a decrease in the selectivity of the interaction with Pd(II) ions but increases the affinity for Fe(III), Ni(II), and Cu(II). Preconcentration in the dynamic mode allows quantitative sorption of Pd(II) and Pt(IV), followed by virtually quantitative elution of the metal ions from the sorbent surface.

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6.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis of Fe@C nanoparticles containing sulfo groups on their surfaces and study of their aggregation behavior in aqueous media / I. A. Bakhteeva, I. V. Medvedeva, I. V. Byzov [et al.] // Russian chemical bulletin. - 2021. - Vol. 70, № 4. - P722-731
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
MAGNETIC NANOPARTICLES -- IRON-CARBON -- BENZENESULFONIC ACID -- IR SPECTROSCOPY
Аннотация: Magnetic iron nanoparticles (MNPs) encapsulated in a carbon shells and containing sulfo groups on the surface (Fe@C-SO3H) were synthesized. The aggregative stability of aqueous suspensions of the Fe@C-SO3H nanoparticles was studied in solutions of bovine serum albumin and calcium chloride and in phosphate-buffered saline, which simulate blood plasma. It is shown that the Fe@C-SO3H particles practically do not aggregate in the phosphate buffer saline for a long time (several days). On the contrary, MNPs encapsulated in a protein shells using ultrasonic treatment form aggregates up to 110–120 nm in size under these conditions. Suspensions of the Fe@C-SO3H particles are stable in aqueous solutions of calcium chloride in the range of the solid phase concentration between 0.05 and 0.10 g L−1. The results obtained indicate the possibility of using the functionalized Fe@C-SO3H nanoparticles in vitro experiments in biological media.

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7.
Инвентарный номер: нет.
   

   
    Silica coating of Fe3O4 magnetic nanoparticles with pmida assistance to increase the surface area and enhance peptide immobilization efficiency / A. M. Demin, A. I. Maksimovskikh, A. V. Mekhaev [и др.] // Ceramics international. - 2021. - № б/н. - P1-6
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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8.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis and spectroscopic study of Si, Ti, Mg, and Zn oxides modified by L-Proline / O. V. Koryakova, M. S. Valova, Y. A. Titova [et al.] // Journal of Applied Spectroscopy. - 2021. - Vol. 88, № 3. - P519-527
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Individual and mixed oxides of Zn, Mg, Si, and Ti modified with L-proline during their solgel synthesis have been obtained. The IR spectra of these oxides studied in detail show changes in the vibrational band parameters of the siliconoxygen and metal–oxygen bonds. Enhancement of the amount of basic sites on the SiO2–TiO2 mixed oxide was found after removal of L-proline from the surface. The use of SiO2–Mg(OH)2* L-proline composite as a catalyst leads to an enhanced enantiomeric excess of some asymmetric Biginelli reaction products up to 18%.

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9.
Инвентарный номер: нет.
   
   E 27

   
    Effect of polarity of solvent on silanization of halloysite nanoclay using (3-glycidyloxy propyl) trimethoxy silane / A. M. Abu el-Soad, A. V. Pestov, N. A. Martemyanov [et al.] // Journal of inorganic and organometallic polymers and materials. - 2021. - № 31. - P2569–2578
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The grafting of silane groups on clay surfaces has been recently investigated in order to fabricate versatile compounds with new potential applications in materials science and ecological engineering. This work explored the influence of variety of solvents with variable polarity on the silanization of halloysite nanoclay (HNT) surface by (3-Glycidyloxy propyl) trimethoxy silane. To this purpose, the functionalization of HNT by 3-Glycidyloxypropyltrimethoxysilane (GOPTMS) has been conducted in Ethanol (polar protic solvent), Tetrahydrofuran (THF) and Acetonitrile (polar aprotic solvents), and Hexane, 1,4-Dioxane and Toluene (non polar solvents). The silane grafted materials were characterized by using several techniques, including Fourier Transform Infrared Spectroscopy (FT-IR), elemental analysis, Scanning Electron Microscopy (SEM), Thermogravimetry (TGA), X-ray Diffraction Analysis (XRD) and Nitrogen adsorption/desorption isotherms. The largest silane loading has been detected for the hybrid nanomaterials prepared in Hexane as a dispersing medium.

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10.
Инвентарный номер: нет.
   

    Shishmakov, A. B.
    Few-step synthesis of PdO/TiO2 and Pd/TiO2 xerogels / A. B. Shishmakov, Yu. V. Mikushina, O. V. Koryakova // Inorganic Materials. - 2021. - Vol. 57, № 2. - P164-170
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
XEROGEL -- TITANIUM DIOXIDE -- PALLADIUM
Аннотация: We demonstrate a few-step technique for the synthesis of PdO/TiO2 and Pd/TiO2 (0.1–2.0 wt % Pd) xerogels, which comprises hydrolysis of a palladium nitrate solution in titanium tetrabutoxide in the vapor atmosphere over an aqueous acetic acid solution, drying, and calcination of the material between 800 and 870°C. According to X-ray diffraction and electron microscopy characterization results, after calcination at 800°C the xerogels contained palladium in the form of PdO particles ≤3–5 nm in size. The highly dispersed palladium(II) oxide covered the surface of the rutile crystallites and filled pores in between. Throughout the range of Pd(NO3)2 concentrations studied, the PdO particles were identical in size. In the material calcined at 870°C, palladium had the form of metallic particles ranging in diameter from 55 to 420 nm. Raising the palladium nitrate concentration in titanium tetrabutoxide was shown to increase the average size of the Pd particles.

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