STRUCTURAL-GROUP COMPOSITION AND GROWTH-REGULATING ACTIVITY OF D-GLUCOSE–M-AMINODENZOIC ACID CONDENSATION PRODUCTS
UDC 547.9:661.15
Abstract
Structural-group composition is studied, mechanisms of formation are proposed and assessment of plant growth activity of condensation products in D-glucose–m-aminobenzoic acid (m-ABA) system is carried out. Solid product of complete reaction system, formed from initial components as a result of complex reaction combination is fractionated with water, nondialysable component is isolated from water-soluble fraction, studied by methods of elemental analysis, electronic and vibrational spectroscopy, as well as tested as growth regulating agent. According to IR-Fourier spectroscopy, undialysable water-soluble products are characterized by structural-group compositions close to natural humic substances: mainly aliphatic backbone including C=C, C=O, C–O, OH-functions and bounded arylamine fragments (m-ABA). The profile of the electron spectra confirms the presence of sufficiently long chromophores in the structure. Such functionalization provided the necessary ratio in the product structure of the active groups and the aromatic component for the development of humic products growth activity at low concentrations due to optimal polar-hydrophobic interactions at supramolecular association level, which was confirmed experimentally by the evaluation of cucumber seeds growth indices of the "Nezhinsky" variety. Additional spectral studies of seed seedlings allowed to justify the mumbling effect of synthesized products, the maximum effect of which was observed in the area of low (0.0008%) solutions concentrations, which is also characteristic of natural humate’s stimulating influence. Further studies are planned in the direction of studying the effect of synthesized products on individual phases of plant development, as well as estimation of their ecotoxicity and biodegradation ability. The results obtained supposed to be the basis of technological scheme for production of processed humin-like products on an industrial scale.
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