Химия

Sol-gel materials with immobilized triphenylmethane dyes (Pyrocatechol Violet and Bromphenolic Blue) based on sol-gel technique with tetraethoxysilane were produced. Protolytic properties of the immobilized indicators were investigated. It was shown that these sol-gel films could be use as sensitive elements of pH optical sensors with dynamic range from 1 to 8 pH units. 

A generalized scheme of topological transformation of the phase diagrams of ternary delaminating salt – binary solvent systems with salting-out at changing temperature and under constant pressure has been developed for the cases of the binary liquid constituent system being delaminating with an UCST, LCST, or not delaminating over the whole temperature range of its li

The biological activity of chitosan oligomers of various molecular masses was examined on E.coli (АТСС 25922), S.aureus (АТСС 25923), and fungus Candida albicans (АТСС 10231). All the samples under study inhibited the growth of these microorganisms, especially S.aureus. The dependence of the biological activity of chitosan oligomers on their concentration, exposure time, and molecular mass has been established.

The sorption and bactericide properties of chitosan films with various humidity and preparation temperature were studied. Film chitosan samples have been found to possess high transport properties to water and hydrochloric acid vapors and to show bactericide activity. The temperature of film preparation practically does not influence the sorption properties. The swelling degree, sorption rate, and bactericide effect increase with the film’s humidity. Clinical tests of our film samples have shown their high efficiency at burn treatment.

The viscometric properties of diluted solutions of cellulose diacetate in dimethylsulfoxide in a temperature range 25-65°С were studied. The concentration dependence of the reduced specific viscosity is linear. The limiting viscosity [η] value regularly decreases as temperature grows and the viscosity-average molecular weight of the polymer decreases. The Mark – Kuhn – Howink constants have been determined.

Phase equilibria and critical phenomena in cut 1 of the quaternary system water - pyridine - butyric acid - potassium chloride whose constituent ternary liquid system had a closed binodal curve were studied by means of the visual-polythermal method within 5-80°C. The volumes of two monotectic states in the composition tetrahedron have been found to be in contact via critical tie lines with increasing temperature.

Results of studying thermal destruction some L-α-aminoacids are resulted. Typical stages and speed thermal destruction depending on character of a radical of aminoacids are shown and characterised. Temperatures of thermal decomposition of the studied aminoacids are resulted.

Information about test-methods discovering and quality determination pesticides, polycyclic aromatic hydrocarbons, hydrocarbons of oil, phenol and it’s derivative, halogen- and nitrogen-containing organic substances, surfactants in water environment. There are different methods indication analytical signal for appreciation of containing analyzing components and ranges and low levels determining containing. Different test ways are presented used for express test indicated mentioned organic substances in some object.

There were considered and analysed main scientific and pedagogical problems which were described in investigations of Professor Isaac Mustafin in Saratov State University in the fields of organic, analytical, physical, biological, caustibiolite's chemistry and of the history of science. Also there was given review of the works of different investigators of I.S. Mustafin's scientific inheritance.