INVESTIGATION OF THE ADSORPTION PROCESS OF PECTIC SUBSTANCES FROM GARDEN GOOSEBERRY (GROSSULARIA RECLINATA) LEAVES AT TWO INTERFACES

DOI: https://doi.org/10.29296/25419218-2018-08-06
Issue: 
8
Year: 
2018

S.L. Adzhiakhmetova, L.P. Mykots, N.M. Chervonnaya, I.I. Kharchenko, N.A. Tukhovskaya, E.T. Oganesyan Pyatigorsk Medical Pharmaceutical Institute, Branch, Volgograd State Medical University, 11, Kalinin Pr., Pyatigorsk, 357532, Russian Federation

Introduction. Pectin substances contained in various plants are widely used as detoxifiers (enterosorbents). The sorption ability of pectic substances was studied in the flowers of Korean chrysanthemum (Dendranthema zawadsii), the leaves of black mulberry (Morus nigra), white mulberry (Morus alba), bear’s onion/ramsons (Allium ursinum), and garden gooseberry (Grossularia reclinata). The pectic substances are characterized by sorption properties with respect to radioactive isotopes of metals. Objective: to identify the relationship of the content of pectic substances to the phase of vegetation, by using the leaves of garden gooseberries as an example, and to determine their complexing ability and surface activity Material and methods. Pectic substances were isolated from garden gooseberry leaves and were assigned to surfactants by the magnitude of surface tension at the liquid/gas interface with the maximum bubble pressure method. Adsorption was calculated using the Gibbs equation; the sizes of the adsorbed molecules of pectic substances were determined. The sorption ability (complexing activity and sorption capacity) for the obtained pectin was studied with respect to lead ions. Results. The yield of pectic substances obtained from gooseberry leaves was significantly higher than that of water-soluble polysaccharides. Their highest content gravimetrically estimated was observed in July and August. The surface activity of pectic substances from gooseberries was 0.166 h∙m2∙kmol-1. The parameters of the adsorption layer formed by the molecules of pectic substances were calculated: the cross-sectional area of a molecule was 6.23A2; the thickness and volume of the surface layer was 4584 A and 28558 A3, respectively. Most (87.5%) lead ions were bound by pectin isolated from garden gooseberry leaves collected in August, which corresponds to 10.4 mg of lead ions per g of sorbent. Conclusion. The study of the sorption ability and surface activity of pectic substances from gooseberry leaves makes it possible to assign them to a group of surfactants. The maximum yield of pectic substances from gooseberry leaves is seen in the July-August period. The functional relationship of the adsorption value to the equilibrium concentration to Pb2+ ions can be expressed by the Langmuir equation. The maximum binding of lead ions was 87.5%, which suggests that pectic substances obtained from gooseberry leaves can be used as biological detoxifiers.

Keywords: 
garden gooseberries
Grossularia reclinata (L.) Mill.
leaves
pectic substances
adsorption
surface activity
complexing ability

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