Study of polysaccharides of common raspberry shoots and their sorption activity

Abstract

A comparative study of the water-soluble polysaccharide complex and pectin substances of first and second year shoots of common raspberry. Objective - comparative study and sorption activity of polysaccharides of common raspberry shoots. Materials and methods. The samples for the research were collected in a dark coniferous forest on the territory of the Ilyinsky district of Perm Region. The content of polysaccharide fractions was determined by the modified Dreywood anthrone- sulfurous method. A water-soluble polysaccharide complex and pectin substances were sequentially obtained from different parts of the shoots. The sorption activity was determined by the ability of the substances to bind methylene blue, which is a marker for most medical sorbents. The acute toxicity of the obtained polysaccharide fractions was examined according to Prozorovsky V.V. Results. The shoots of the first and second year of common raspberry accumulate more pectin substances than water-soluble polysaccharides. Leaves of raspberry contain more polysaccharides compared to leafless parts. As a result of acute toxicity study, it was found that all studied substances can be classified as low-toxic (LD50>5,000 mg/kg). It was found that water-soluble polysaccharide complex obtained from leafless parts of the shoot of the first and second year shows sorption activity reliably higher than that of the reference preparation (Polyphepan). Sorption activity of pectin substances obtained from leaves of the first and second year shoots also exceeds that of the reference preparation. The highest sorption activity is shown by pectin substances of the second year, and the lowest sorption activity by pectin substances of leafless raspberry shoots. Conclusion. The obtained substances are promising for creating modern sorbents based on polysaccharide fractions of the first and second year shoots of common raspberry. Taking into account the simplicity in harvesting and high sorption activity of polysaccharides of the leafless part of the raspberry shoot, not only leaves but also leafless parts of the shoot should be harvested.