A multiwavelength spectrophotometric titration method was applied to study the protolytic constants of 4-(2-pyridylazo) resorcinol(PAR), in binary DMF+water mixtures. UV-vis absorption spectra of PAR solution were recorded in the course of pH-metric titration of acidic solutions of PAR with standard base solution. The protolytic equilibrium constants, spectral profiles, concentration diagrams a...

The dairy industry uses enzymes to make cheese, alter product flavor, and eliminate lactose. activities of these have been measured in clear buffered solutions, but because the limitations spectrophotometric methods, enzyme not opaque or colored products where they are used. Isothermal titration calorimetry (ITC) can be used determine reaction kinetics solutions by measuring heat rate (thermal ...

The pH titration behavior of E . coli rRNA in the acid range has been analyzed by combining spectrophotometric and potentiometric titration data. The “simplest” model for the system, which considers as possible reactions the protonation of adenine (A), cytosine (C), and guanine (G) residues along with the opening of A-U and G . C base pairs, does not adequately account for the titration propert...

Introduction. According to the World Health Organization, number of patients with diseases nervous system in world is increasing every year. The use phytopreparations a promising direction pharmacotherapy; preparations from medicinal plant materials have advantages treatment chronic diseases. Aim. Qualitative analysis and quantitative determination main groups biologically active substances col...