Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks.

The topological structure of the macromolecules of lignins isolated from oat husk and fir wood was studied by means of macromolecular hydrodynamic methods. The macromolecular properties were analyzed by evaluating the intrinsic viscosity and coefficients of the translational diffusion and the sedimentation velocity of the lignins in dilute dimethylformamide solutions. The average molecular weights (M) and polydispersity parameters were calculated based on the results of the fractionation, as follows: M = 14.

Effects of Plasma Treatment on the Surface and Photocatalytic Properties of Nanostructured SnO-SiO Films.

In this work, we study the effects of treating nanostructured SnO-SiO films derived by a sol-gel method with nitrogen and oxygen plasma. The structural and chemical properties of the films are closely investigated. To quantify surface site activity in the films following treatment, we employed a photocatalytic UV degradation test with brilliant green.

Control over the Surface Properties of Zinc Oxide Powders via Combining Mechanical, Electron Beam, and Thermal Processing.

The surface properties of zinc oxide powders prepared using mechanical activation, electron beam irradiation, and vacuum annealing, as well using combinations of these types of treatments, were studied using X-ray photoelectron spectroscopy. The structure of the obtained materials was studied by an X-ray diffraction technique and by scanning electron microscopy. We found that over five hours of grinding in an attritor, the size of nanocrystals decreases from 37 to 21 nm, and microdeformations increase from 0.

Water stable colloidal lignin-PVP particles prepared by electrospray.

In this study, electrospray deposition has been used as a method to prepare lignin submicron spherical particles. Regularities of electrospraying of lignin solutions in DMSO were revealed. The influence of voltage, distance between electrodes, feed rate, temperature and concentration of lignin solution on the morphology, size and polydispersity of the obtained particles was determined.

In vitro adsorption-desorption of aflatoxin B1 on Pepper's lignins isolated from grassy plants.

The aflatoxin B1 (AFB1) adsorption properties of several lignins isolated by the Pepper's method from grassy plants: Helianthus tuberosus (LS-1), Atriplex patula (LS-2), Rhododendron tomentosum (LS-3), Althaea officinalis (LS-4), Lavatera (LS-5), and from wood of spruce Pícea (LS-6) were studied. The adsorption was conducted in vitro in the modeled conditions of the gastrointestinal tract. The correlations between the values of adsorption-desorption and the parameters of surface-porous structure and chemical structure of the lignins were established.

Comparative study of chemical and topological structure of macromolecules of lignins of birch (Betula verrucosa) and apple (Malus domestica) wood.

Recent advances in investigations of chemical structure of lignin give rise to questions about relationship between chemical structure and topology of the macromolecules. In this paper, we made a comparison of results of the studies of chemical and topological structures of lignins. The features of topological structure of lignins of birch and apple wood were identified on the basis of the study of dilute solutions of the lignins by the sedimentation-diffusion analysis and viscometry.

[Lignins of Rhodiola rosea and Serratula coronata: peculiarities of chemical structure and antioxidant properties].

Data on comparative investigations of chemical structure of lignins from medical grassy plants Rhodiola rosea and Serratula coronata lignins were obtained. The NMR and ESR spectroscopy, and functional and element analysis were used. The high antioxidant activity of lignins was shown.

[Food lignins as natural geroprotectors].

Antioxidant properties of different botanic origin water soluble lignins are considered. Possibility to develop onco- and geroprotectors on the base of natural lignins is shown.