Spectral characterization of selected humic substances

Enev, Vojtěch; Pospíšilová, Lubica; Klučáková, Martina; Liptaj, Tibor; Doskočil, Leoš

doi:10.17221/39/2013-swr

Cited by 91 publications

(65 citation statements)

References 36 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Humate has ─OH stretching, aliphatic C─H stretching (3500‐2800 cm −1 ), aromatic C═C skeletal vibrations, C═O stretching of amide groups, COO − stretching (1637 cm −1 ) , aliphatic ─CH bending of CH 2 and CH 3 (1362 cm −1 ), C─O and C─O─C stretching (1024 cm −1 ) vibration of polysaccharide and/or Si─O stretching . Si─O stretching around 1020 cm −1 wavenumbers is a characteristic attribute for humate originated from clay minerals…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial activity of copper‐humate‐cellulose sheets

2020

View full text Add to dashboard Cite

During our research, cellulose‐based test sheets containing copper and potassium humate were prepared and tested against several bacterial and fungal strains. The energy dispersive X‐ray spectrometry and attenuated total reflectance (ATR) Fourier‐transform infrared spectroscopy revealed that humate contributed to increase the copper content of the test sheets. The antimicrobial impact of test sheets on various fungi (Penicillium expansum, Wallemia sebi, and Aspergillus brasiliensis) and bacteria (genera Micrococcus, Enterococcus, Bacillus, Salmonella, Staphylococcus, Listeria genera) was tested using a modified agar diffusion‐based assay. On the basis of the disc diffusion results, the sheets effectively inhibited all the tested fungi and Gram‐positive bacteria. The highest antimicrobial effect was exhibited by the copper‐containing test sheet with 1:0.1 and 1:0.25 cellulose:humate weight ratio. Deterioration test with blackberries demonstrated the shelf life extending effect of the sheets.

show abstract

Section: Resultsmentioning

confidence: 99%

Antimicrobial activity of copper‐humate‐cellulose sheets

2020

View full text Add to dashboard Cite

show abstract

“…As published by Malcolm (1990), Preston (1996), Enev (2014) and many others, 13 C NMR spectroscopy is able to characterise the types of carbon and aromaticity degree of HA samples. Subdivision of the spectrum has been made by the commonly used scheme of Malcolm (1990).…”

Section: Methodsmentioning

confidence: 97%

“…13 C NMR spectra are significant contribution to deepening structure of HA (Barančíková 2008;Enev et al 2014).…”

Section: Comparison Of Chemical Structure Of Alginite Ha Isolated Witmentioning

confidence: 99%

Comparison of Chemical Structure of Alginite Humic Acids Isolated with Two Different Procedures with Soil Humic Acids

Barančíková¹,

Litavec²

2016

Agriculture (Polnohospodárstvo)

View full text Add to dashboard Cite

The different origin of alginite and soil organic matter may be the reason of differences in their humic acids (HA) chemical structure. One of the aims of this article is to compare the chemical composition of alginite HA and HA isolated from different soil types. Another aim of this article is to compare the chemical structure of humic acids of alginite isolated with two different procedures: modified IHSS (International Humic Substances Society) method and simplified extraction method. The modified IHSS method was applied for the isolation of alginite and soil HA. To obtain sufficient amount of alginate HA for biological experiments, simplified extraction method suited for large volumes of HA was applied. The differences in elemental analysis and ash proportion in HA extracted by modified IHSS method (C = 35.4, H = 43 atomic%, ash content = 0.08%) and simplified extraction method (C = 31, H = 31 atomic%, ash content = 7.42%) can be caused by different concentration of extraction solution and also differences in purification of HA. The differences in chemical structure between alginate HA and HA isolated from different soil types according to the data of elemental analysis (C content of alginite HA = 35.4 atomic%, C content in soils HA = 38.2‒49.1 atomic%) and 13C nuclear magnetic resonance (NMR) spectra (degree of aromaticity of alginite HA = 24.4% and soil HA= 35.9‒53%) were found. Results of 13C NMR show that the content of aromatic carbon was decreasing in the following order: Haplic Chernozem HA > Andic Cambisol HA > Haplic Cambisol HA > alginite HA. Based on the obtained results, it can be concluded that the differences in the chemical structure of alginite and soil HA can be explained by the difference in the origin of organic matter in alginite and soil samples. The source of organic matter in alginite is mainly type II kerogen from algae and that of soil is lignin and cellulose (type III kerogen) of higher plants.

show abstract

“…Associated silicates were also visible, which get attached to the algae by algal cell wall interactions with silicates within their proximity. According to Dodson etal., during the interaction of the metallic ions with the algae, crystalline Al 2 O 3 and SiO 2 are present in the heterogeneous matrix of the algal cell wall [30]. The IR spectrum of blue-green algae showed the presence of proteins, amide, lipids, aliphatic carbon, amides, and carbohydrates, and the adsorption of clay minerals on the algal surface.…”

Section: Algal Characterizationmentioning

confidence: 99%

Chemical and Biochemical Onslaught of Anthropogenic Airborne Species on the Heritage Monument of the Taj Mahal

Banerjee¹,

Sarkar

2019

Heritage

View full text Add to dashboard Cite

The science on the anthropogenic airborne aerosols impacting the World Heritage marble monument, the Taj Mahal, at Agra, has been studied in the light of modern physico-chemical approaches. The study is an effort to understand unrecognized airborne species which were found on the surface of the Taj Mahal monument. These species have been analyzed in the light of current analytical methods to impart characterization features and their possible impacts on the surface of the marble. Chemical constituents of these substrates, which were incorporated over the top surface of the monument, have been identified. Interestingly, the carbon particulates which were found on the micro level, popularly called “particulate matters”, have now been identified in the nano domain entity, which is chemically more reactive, and have been found on the surface of the monument. Because of their high chemical activity, these nano carbons have a newer chemistry in the presence of air and sunlight, generating several reactive oxygen species (ROS). These ROS are capable of responding to complicated chemical reactions on the surface of the marble in association with deposited cyanophyceae and other deposits of plant origin, causing rapid degradation. This study provides the nature of the onslaught of such monuments exposed under the prevalent smoggy environmental scenario.

show abstract

Spectral characterization of selected humic substances

Cited by 91 publications

References 36 publications

Antimicrobial activity of copper‐humate‐cellulose sheets

Antimicrobial activity of copper‐humate‐cellulose sheets

Comparison of Chemical Structure of Alginite Humic Acids Isolated with Two Different Procedures with Soil Humic Acids

Chemical and Biochemical Onslaught of Anthropogenic Airborne Species on the Heritage Monument of the Taj Mahal

Contact Info

Product

Resources

About