In this study the mathematical model of the extraction process from plant material is developed, taking into account the anatomical structure of plant material, namely the presence of cellular and intercellular spaces. The solution of the model enables to determine its kinetic coefficients Dc, Dt, process conditions, and predict the kinetics of the extraction process implementation in practice.
Adequacy of mathematical model of the extraction process of cellular structure solid bodies (plant material) has been proved taking into account its anatomical structure, namely the presence of cellular and intercellular environment. Diffusion coefficients through the cellular membrane Dc and in intercellular environment Dт have been determined. Experimental verification of the accumulation of intracellular substances in intercellular environment during the extraction process flow has been made.
Adequacy of mathematical model of the extraction process of solid bodies of cellular structure (plant material) was proved with taking into account its anatomical structure, namely the presence of cellular and intercellular environment. Experimental verification of the mechanism of extracting of intracellular substance during extraction process flow was made. An order of diffusion coefficients through cellular membrane – Dc and in intercellular environment Dт was confirmed.
A mathematical model of mass transfer from lamina (plant leaf) into the extractant is constructed considering its anatomical organization in particular the existence of cellular and intercellular space. Its solution allows to predict kinetics of the extraction process of the whole leaves at its implementation in practice.
We present results of development of mathematical models of external mass exchange in extraction of desired products from vegetable raw materials and mathematical models for the determination of the minimum time of achievement of the equilibrium state of the system and the current concentration of a soluble substance for their using in the optimization of operation of solid-phase extraction equipment.
The kinetics of controlled release of medicinal substances from chitosan films has been investigated. Correlation between values of diffusion coefficients and the sedate indicator characterizing diffusion of medicinal substance from a film and shares of medicinal substance connected with a polymeric chain has been established. With the increase in amount of the entered medicinal substance the rate of release of medicines decreases.
The structure of extruded films based on blends of polyvinyl alcohol and poly(3-hydroxybutyrate) (PHB) was studied for various compositions. The methods of DSC and X-ray analysis were used. As the phase-sensitive characteristics of the composite films, diffusion and water vapor permeability were also investigated. In addition, the tensile modulus and relative elongation-at-break were measured. Changes in the glass transition temperature of the blends and constant melting points of the components show their partial compatibility in intercrystallite regions.