Sorption isotherm of saponin Quillaja Saponaria Molina on polymer super-crosslinked sorbent MN-200
Abstract
Traditionally extracted from plant material fraction of natural glycosides triterpene saponins extraction method contain a mixture close to the structure of the saponins, and used solvents and process conditions may cause the destruction of their structure. Unique physical properties and well-developed porous structure of the polymer MN-200 allow you to optimize technological processes of obtaining and separation of natural compounds class of terpenes.
The aim of this work was to study equilibrium sorption of triterpene saponin Quillaja Saponaria Molina on polymer sorbent MN-200, and the analysis of the isotherm with the use of classical models.
The object of the study was a sample of the saponin Quillaja Saponaria Molina production Belgium. Styrosorb MN-200 belongs to the group of organic polymer sorbents – supersewn polymer materials based on styrene and divinylbenzene with a high surface area and macroporous structure. Sorption equilibrium in the system saponin - sorbent MN-200 was studied at a temperature of 295±2 K under static conditions by the method of variable concentrations.
The obtained isotherm sorption of saponin according to the classification of Giles meets 4L-type. The linear dependence of the sorption parameter and the formation of a plateau on isotherme in the region of low concentrations correspond to the formation of a monolayer of saponin on the surface of the sorbent. The formation of this inflection is caused primarily by interaction of free saponin molecules with the matrix of the sorbent.
The increase in sorption parameter once in solution, the concentration of saponin will exceed the critical concentration of micelle formation (CCM) by the association of glycoside molecules coming to the surface section of phases, existing in the adsorption layer of the associates.
For the quantitative description of sorption in the interval of concentrations used linearizable equations of the theories of Langmuir, Freundlich and BET.
The high value of the correlation coefficient, as well as the comparability of the values of the constants KL and KS with the literature data allows the use of a BET equation to describe multi-molecular sorption of saponin on the surface of the sorbent MN-200.
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References
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