This paper deals with the use of tetrabutylammonium fluoride/dimethylsulfoxide (TBAF/DMSO) to characterize the molar mass distribution of non-derivatized cellulosic samples by size exclusion chromatography (SEC). Different cellulose samples with various average degree of polymerization (DP) were first solubilized in this solvent system, with increasing TBAF rates, and then analyzed by SEC coupl...

Abstract The thermal analysis methods were used for the description of adsorption behaviour selected proteins differing in internal stability (ovalbumin (OVA) and lysozyme (LSZ)). These immobilised on surface activated biocarbon obtained from horsetail herb precursor. values hydrodynamic radius both biopolymer macromolecules solution determined by use viscosimetry method. This parameter is impo...

We present an experimental study of the rheology and structure a confined suspension deformable particles flowing in quasi-two-dimensional Poiseuille flow. Thanks to precise microfluidic viscosimetry technique combined with measurements concentration profiles, our provides first confirmation {with three-dimensional particles} strong relationship between structuring effects rheology, previously ...

Two microbial lipases from Burkholderia cepacia and Pseudomonas fluorescens were evaluated as catalysts for the enzymatic transesterification of beef tallow with ethanol and the most efficient lipase source was selected by taking into account the properties of the product to be used as fuel. Both lipases were immobilized on an epoxy silica-polyvinyl alcohol composite by covalent immobilization ...

The observation of Boman and Kaletta (I, 2) that venom phosphodiesterase is capable of hydrolyzing the so called native thymus deoxyribonucleic acid has been confirmed in several laboratories (3-5). Boman (6) noticed that under appropriate conditions the reaction may be carried almost to completion. All these experiments were performed with comparatively crude preparations of phosphodiesterase....

Particle tracking has been shown to be a powerful technique for measuring bulk and interfacial rheology of fluids. The Brownian motion of microparticles trapped at interfaces is very sensitive to the viscosity of the subphase, and to the contact angle of the particles. The Stokes-Einstein relation is fulfilled if the friction factor is properly taken into account. The diffusion coefficient of t...

The copper-PMMA conductive composites were manufactured using different copper concentrations dispersed into the polymeric matrix by hot compression molding in inert atmosphere. The PMMA matrix was analyzed using dilute solution viscosimetry analysis and it did not evidence degradation in its molecular weight. The microstructure was examined by means of SEM and the electric conductivity was mea...

The influence of solution pH (in the range 3-9) on the adsorption of polyacrylic acid (PAA) on the mixed silica-alumina surface (SA-3: SiO2 97 %-Al2O3 3 % and SA-96: SiO2 4 %-Al2O3 96 %) was investigated. The following methods were applied in experiments: spectrophotometry, viscosimetry, potentiometric titration, and microelectrophoresis, which enable determination of adsorbed amount of the pol...

Abstract This study aim was to explore the laser backscattering imaging technique's capacity model curdling phase in cheese processing. To do so, three different formulas were studied by modifying solute concentration. Textural modifications matrix during characterised viscosimetry and texture measurements depending on samples' liquid or solid state. state changed determining gelation establish...