Molecular structure of humus acids in soils

Безуглова, О. С.

doi:10.1002/jpln.201900043

Cited by 12 publications

(4 citation statements)

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“… 35 , 54 HAs are organized in sopramolecular soft and permeable clusters, exposing hydrophilic groups, whereas hydrophobic species are shielded in the interior. 55 , 56 These chemical features make HAs highly reactive with proteins. 57 Accordingly, they can interact with gelatin through noncovalent interaction, such as hydrophobic and electrostatic interactions, as well as H-bonds.…”

Section: Resultsmentioning

confidence: 99%

“…HAs are mixtures of relatively low molecular weight compounds, characterized by a great variety of functional groups, including quinone, phenol, carboxyl, and hydroxyl moieties. , HAs are organized in sopramolecular soft and permeable clusters, exposing hydrophilic groups, whereas hydrophobic species are shielded in the interior. , These chemical features make HAs highly reactive with proteins . Accordingly, they can interact with gelatin through noncovalent interaction, such as hydrophobic and electrostatic interactions, as well as H-bonds.…”

Section: Resultsmentioning

confidence: 99%

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Adding Humic Acids to Gelatin Hydrogels: A Way to Tune Gelation

et al. 2021

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Exploring the chance to convert biowaste into a valuable resource, this study tests the potential role of humic acids (HA), a class of multifunctional compounds obtained by oxidative decomposition of biomass, as physical agents to improve gelatin’s mechanical and thermal properties. To this purpose, gelatin–HA aqueous samples were prepared at increasing HA content. HA/gelatin concentrations changed in the range 2.67–26.67 (wt/wt)%. Multiple techniques were employed to assess the influence of HA content on the gel properties and to unveil the underlying mechanisms. HAs increased gel strength up to a concentration of 13.33 (wt/wt)% and led to a weaker gel at higher concentrations. FT-IR and DSC results proved that HAs can establish noncovalent interactions through H-bonding with gelatin. Coagulation phenomena occur because of HA–gelatin interactions, and at concentrations greater than 13.33 (wt/wt)%, HAs established preferential bonds with water molecules, preventing them from coordinating with gelatin chains. These features were accompanied by a change in the secondary structure of gelatin, which lost the triple helix structure and exhibited an increase in the random coil conformation. Besides, higher HA weight content caused swelling phenomena due to HA water absorption, contributing to a weaker gel. The current findings may be useful to enable a better control of gelatin structures modified with composted biowaste, extending their exploitation for a large set of technological applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Adding Humic Acids to Gelatin Hydrogels: A Way to Tune Gelation

et al. 2021

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“…Essential components of this process are plant lignin, its transformation products, polysaccharides, melanin, cutin, proteins, lipids, nucleic acids and fine coal particles (Bezuglova, 2019).…”

Section: Introductionmentioning

confidence: 99%

Energy Profile in Broiler Chickens Fed with Different Levels of Humates

Marcïn

Naď

Gancarčíková

et al. 2023

AJAFS

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The objective of the study was the evaluation the effects of the peroral intake of humates (HS) added into feed mixtures on the energy metabolism of broiler chickens (Cobb 500). The selected parameters are concentrations of glucose, triglycerides and cholesterol analysed in the blood serum. There were used four groups of birds (A, B, C, negative control; n=120) in the experiment. Chickens were fed with ground diets (starter HYD1, grower HYD2, finisher HYD3) with supplements of HS from day 1 to 37 as follows A: Humac nature (HN) 7 g/kg, B: Humac nature monogastric (HNM) 7 g/kg, C: HNM 5 g/kg feed (Humac Ltd., Slovak Republic). The diets had the following content of crude protein: HYD1 230.20, HYD2 222.20, HYD3 209.40 g CP /kg dry matter). The statistical evaluation of results was performed by one-way analysis of variance and means were compared by the Student-Newman-Keuls test and correlation analysis. Higher concentrations (P<0.05) of triglycerides in blood serum were analyzed in groups A or B by 0.24 and 0.26 mmol/l, respectively, in comparison to the control group (y = 0.35830x + 0.58324). The values of cholesterol were at a lower level (P<0.05) in all 3 experimental groups by 1.07, 0.54 and 0.84 mmol/l (y = - 1.18073x + 2.75772). The positive effect of the intake of HS on glucose concentration was not confirmed when a higher concentration (P<0.05) was analyzed in the blood serum of the control group compared with groups A or C by 3.31 and 4.56 mmol/l (y = - 4.06420x + 13.37519), respectively.

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“…In fact, humus compounds are a humus matrix of complex multilevel organization (Fedotov and Dobrovolskiy, 2012). It was also found that the supramolecular organization of HAs in Chernozems and Kastanozems can be described as a spatial structure composed of 2-4 layers of condensed aromatic systems supplemented by a network of chain fragments with different degrees of regularity and lengths (Bezuglova, 2019). The purpose of this work is to study the identification features of humus in the process of long-term transformation through successive stages of the extraction of specific humic substances from a typical organogenic substrate (greenhouse soils) using alkaline and acid reagents.…”

Section: Introductionmentioning

confidence: 99%

Identification of humic substances on the transformation of an organic substrate

Безуглова¹,

Komarov²,

Komarov³

2022

Eurasian Journal of Soil Science (Ejss)

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The organic matter of the soil and humus are heterogeneous in composition. That is why the nature of soil organic matter has not yet been fully understood and causes many discussions. The purpose of this work is to study the identification features of humus in the process of peat's transformation. The results of a fiveyear experiment studying the processes of organic matter transformation in organic-mineral substrate based on peat growing coniferous seedlings in greenhouses are presented. In the dynamics of the group and fractional composition of humus for several years the biochemical essence of the humification process is revealed. To extract specific humic substances from the organogenic substrate, we used the method of fractioning humus into groups and fractions, which is a stepwise sequential extraction using solutions of sodium hydroxide and sulfuric acid. It was found that the organic matter of the substrate passes through three stages of transformation: hydrolysis of organic products → initial transformation → humification of lignin structures. There is a significant change in the ratio of the three main groups of humus in favor of humic acids at the third stage. In general, the system is tends to its most stable state: aromatic structures are copolymerized, the core of humic substances is densified, and humus gradually "matures".

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Molecular structure of humus acids in soils

Cited by 12 publications

References 13 publications

Adding Humic Acids to Gelatin Hydrogels: A Way to Tune Gelation

Adding Humic Acids to Gelatin Hydrogels: A Way to Tune Gelation

Energy Profile in Broiler Chickens Fed with Different Levels of Humates

Identification of humic substances on the transformation of an organic substrate

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