Examination of the extract from lichen (<i>Cetraria islandica</i>) after an ultrasonic impact

Abstract

An integral part of human healthy nutrition is intake of biologically active substances. Extraction is an important stage of isolation of different bioactive substances from plants and effectiveness of their extraction increases with the use of ultrasonic treatment. The aim of this research was to study an effect of different types of aqueous media and treatment methods on Cetraria islandica, including the use of principles of ultrasonic treatment and maceration methods (infusion). The experimental studies consisted in detecting an effect of the active acidity of the aqueous medium (solvent) and method of impact upon extraction on several physicochemical and rheological indicators. The experimental samples of extracts were examined by the following indicators: active acidity and redox potential detected by the ionometric technique; dynamic viscosity and the depth of output of polymeric forms of phenolic substances determined by measuring the optical density and transmission coefficient. Mathematical processing of data using the regression analysis was carried out. The results are presented as graphs, tables and regression equations. It has been established that transfer of substances from Cetraria islandica to its extracts had high results at pH = 7.0 and рН = 9.0 of the solvent. When obtaining extracts by the infusion method, the quantity of polymeric compounds in the transition process was 1.3 times higher than the quantity of monomeric forms of phenolic compounds. The highest value of the dynamic viscosity was revealed in the extract sample obtained by the infusion method in the alkaline medium. The extracts obtained can be used in food system modeling.

Keywords

• cetraria islandica
• redox potential
• viscosity
• optical density
• active acidity