Investigation of the Dependence of Biological Activity on the Structural Parameters of Native and Modified Humic Acids from Brown Coal
S. I. ZHEREBTSOV, N. V. MALYSHENKO, K. S. VOTOLIN, K. M. SHPAKODRAEV, Z. R. ISMAGILOV
Institute of Coal Chemistry and Materials Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, Kemerovo, Russia
Keywords: гуминовые кислоты, модифицирование, биологическая активность, индекс фитоактивности, humic acids, modification, biological activity, phytoactivity index
Pages: 148-154
Abstract
The samples of humic acids (HA) isolated from brown coal, both native and modified with hydrogen peroxide and n- butanol, were obtained and studied by means of elemental and technical analysis. The changes of structural parameters and the concentration of paramagnetic centres (PMC) of modified HA were revealed by means of 13C NMR, IR, EPR spectroscopy. The biological activity of native and modified HA was evaluated by means of phytotesting with the seeds of Iren wheat as an example. A trend to a decrease in the biological activity of HA with a decrease in PMC content was discovered. An increase in biological activity is connected with an increase in parameter F1 depicting the relations between hydrophilic and hydrophobic elements in HA structure.
DOI: 10.15372/CSD2020213
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