nanoparticles

Reuse of a purified solution of cetyltrimethylammonium bromide for the synthesis of gold nanorods

Authors: Gudova Y. D., Kochubey V. I., Skaptsov A. A.

We investigate the possibility of reusing CTAB solutions for repeated synthesis of gold nanorods. Three tasks have been solved. The first task is to clean the growth solutions from gold nanorods. The second task is to develop a method using a purified cetyltrimethylammonium bromide solution for repeated synthesis of gold nanorods with the same optical properties as in the initial synthesis. The third task is to test the possibility of management of the optical properties of nanorods during repeated synthesis.

Photocatalytic effect of led radiation (405 nm) and new Al2O3 3D-nanocomposites on the growth of Staphylococcus aureus

Authors: Svetlakova A. V., Tuchina E. S.

The progressive growth of bacterial resistance to antibiotic drugs requires the creation of highly efficient nanomaterials. Aluminum oxide is a stable non-toxic semiconductor material; however, the photocatalytic properties of its modifications in relation to microorganisms are not well understood. In this study, we used new 3D composites of aluminum oxyhydroxide (Al2O3 × nH2O) in three modifications (γ, α and θ), which are a mesh of 150 nm nanofibrils. The assessment of the photocatalytic antibacterial properties of the composites was carried out on the museum strain S. aureus 209 P.

The influence of nature of active components and modifiers on electroanalytic properties of planar cefalexine-selective sensors

Authors: Kulapina E. G., Kulapina O. I., Ankina V. D.

The 1st generation cefalexine-cephalosporine antibiotic is used in the treatment of various infectious diseases. Spectrophotometry, kinetic spectrophotometry, spectrofluorimetry are proposed to determination of cefalexine in medicine and biological environment. Planar screenprinted sensors allow analyzing the micro-volumes of samples, which is important for the analysis of biological objects without preliminary samplepreparation. Depending on the active material and modifiers, you can create planar sensors for the determination of different organic compounds.

Chromatographical Analysis of Meldonium with Preliminary Concentration by Solid-Phase Extraction on Magnetite Nanoparticles

Authors: Sumina E. G., Reshetnikova I. S., Uglanova V. Z., Yurasov N. A.

A comprehensive method for meldonium analysis, based on a combination of magnetic solid-phase concentration of the analyte on magnetite nanoparticles modified with cetylammonium bromide (CTAB) cations and its subsequent analysis by thin-layer chromatography (TLC) were developed in the process of study. The influence of a number of factors on meldonium sorption was studied, namely: pH, sorbent mass, sorption and mixing times; optimal extraction conditions were determined. It was found that quantitative sorption proceeded in 20 min with a meldonium extraction degree of 88%.

New Gypsum-Titanium Composites for Antimicrobial Photocatalytic Action on Staphylococcus aureus

Authors: Tuchina E. S., Korchenova M. V., Svetlakova A. V., Kordas K., Tuchin V. V.

The last decade has allowed the creation of new composite photocatalytic materials with a wide range of applications. Antimicrobial coatings based on photocatalytic materials are environmentally friendly and effective for use in health care, the food industry, enterprises and service facilities. This study is devoted to the study of the antibacterial activity of gypsum-titanium nanocomposites.

Modified Potentiometric Sensors of Various Types for Ceftriaxone Determination

Authors: Kulapina E. G., Chanina V. V.

The planar unmodified and modified by polyaniline, nanoparticles and their binary mixtures potentiometric sensors of various types were manufactured on the basis of tetradecylammonium associates (TDA) with complex connections silver (I) – ceftriaxone (Ag (I) – Ceftr). In sensors of I type electroactive components (EAC) and modifiers were brought in carboniferous ink. The polyvinylchloride plasticized unmodified and modified membranes on the basis [Ag2 (Ceftr)2] 2- · 2TDA were used in the sensors of II type; C (EAC) = 1,2,3%.

Total Charge of Chitosan and Chitosan Succinyl Macromolecules Effect on the Stability of Particles of Silver Iodide Sols in Polymer-Colloidal Based Dispersions

Authors: Bazunova M. V., Bazunova A. A., Khlobystova E. S., Kulish E. I.

Obtaining stable polymer-colloidal dispersions based on watersoluble polymers and inorganic colloidal particles, such as silver iodide sol, followed by removal of the dispersion medium is one of the ways to create hybrid biomedical materials (e.g. films, threedimensional matrices). The current work is devoted to studying the possibility of increasing the stability of polymer-colloidal systems based on silver iodide sols, succinyl chitosan and chitosan polysaccharides by reducing the total charge of macromolecules.

Antimicrobial Photodynamic Effects Using Coatings Based on Metal Nanoparticles (Ag, Au)

Authors: Tuchina E. S., Gvozdev G. A., Kosobudskiy I. D., Shih W., Tuchin V. V.

The combined effect of coatings based on nanoparticles of metals Ag, Au, ultraviolet (365 nm, UVR) and infrared (808 nm, IRR) radiation on Staphylococcus aureus 209 P was studied. Decrease in numbers was shown by 2% in the case of silver coatings and by 8% in the case of gold coatings after 1 h incubation. However, exposure of the IRR to bacterial suspensions caused the death of 43% of the population after 5 min, 86% of the population after 30 min.

Express Method for Cefazolin Determination in Small Samples Sensors Planar Potentiometric

Authors: Kulapina E. G., Chanina V. V.

The unmodified and modified by polyaniline and nanoparticles planar potentiometric sensors on the basis of tetradecylammonium associates with a complex silver (I) – cefazolin are created. Optimum ratios of components in carbon-containing ink are established: 30–32% carbon powder, 16–18% polyvinylchloride, 48–50% dibutylphthalate and 1–3% of electrode active compound (EAC). Planar sensors of two types are examined: electrode active compounds, electrode active compound and modifiers were added into in carbon-сontaining ink.

The Study of Antibacterial Properties of Coatins Based on Metal (Ag, Zn) Nanoparticles in Silicon Dioxide Matrix

Authors: Tuchina E. S., Gvozdev G. A., Kosobudskiy I. D.

The influence of coatings on the basis of Ag and Zn metal nanoparticles in a silica matrix in combination with ultraviolet (365 nm) radiation on Staphylococcus aureus 209 P bacteria was studied. It was shown that the investigated coatings without access to light inhibit the growth of microorganisms by 45% after 3 hours of incubation and 55–70% after 5 hours of incubation. Enhancement of antibacterial properties of nanocoatings was achieved by exposure to UV (365 nm) radiation. The decrease in the number of studied microorganisms was noted by 75% after 30 min of exposure.

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