Electrochemical synthesis and biological activity of iron lignosulfonate

Khabarov, Yu. G.; Veshnyakov, V. A.; Shergin, A. E.

doi:10.1007/s11172-019-2523-2

Cited by 3 publications

(4 citation statements)

References 26 publications

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“…The CaAc-Fe 3+ films started to disassemble earlier, with slow degradation in the beginning and then faster degradation after 24 h. The LS-Fe 3+ film showed typical degradation behavior, and the absorbance at 320 nm was reduced by 95% after 44 h. The different disassembly behavior of the LS-Fe 3+ films may be caused by different functional groups in LS associated with complex formation, including carboxyl, hydroxyl, and sulfonate groups. 13,33 The color of the CaAc-Fe 3+ complex was strongly pHdependent. At pH 1, the complex appeared almost colorless with a slight yellow tone (Figure 6a).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In contrast to lignin, they are water-soluble, which makes them easier to use for MPN formation . LS-Fe 3+ complexes have been examined for the prevention of iron chlorosis in plants, but not yet for the formation of MPN films. − By comparing MPNs made from these new phenols with MPNs formed with tannic acid, we found noticeable differences. They can be disassembled under slightly different conditions and exhibit different colors, opening new fields of use.…”

Section: Introductionmentioning

confidence: 93%

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Exploring Caffeic Acid and Lignosulfonate as Key Phenolic Ligands for Metal-Phenolic Network Assembly

Tomasetig,

Wang,

Hondl

et al. 2024

ACS Omega

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Films formed by metals and phenols through a coordinative interaction have been extensively studied in previous years. We report the successful formation of MPN films from the phenolic compounds caffeic acid and lignosulfonate using Fe 3+ ions for complexation. The likewise examined p-coumaryl alcohol showed some MPN film formation tendency, while for coniferyl alcohol and sinapyl alcohol, no successful film buildup could be observed. These newly formed films were compared to tannic acid-Fe 3+ films as a reference. Film growth and degradation were tracked by using UV−vis absorption spectroscopy. The films were degradable under different conditions such as alkaline environments or in the presence of a strong chelator. Small hollow capsules with a diameter of 3 μm and thicknesses in the nanometer range were produced. Additionally, the prepared films showed varying colors and levels of wettability. By utilizing the films' coating properties, we successfully dyed human hair in various colors.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Exploring Caffeic Acid and Lignosulfonate as Key Phenolic Ligands for Metal-Phenolic Network Assembly

Tomasetig,

Wang,

Hondl

et al. 2024

ACS Omega

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“…Humic substances in soils are natural chelates that increase metal nutrient bioavailability and contribute to avoiding metal nutrient deficiency phenotypes of plants 17 . Lignosulfonate has also been used to synthesize lignosulfonate-iron 18 . Taken together, this indicates that lignin-derived materials have the potential to be used as metal chelators and improve nutrient bioavailability.…”

Section: Introductionmentioning

confidence: 99%

A lignin-derived material improves plant nutrient bioavailability and growth through its metal chelating capacity

et al. 2023

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The lignocellulosic biorefinery industry can be an important contributor to achieving global carbon net zero goals. However, low valorization of the waste lignin severely limits the sustainability of biorefineries. Using a hydrothermal reaction, we have converted sulfuric acid lignin (SAL) into a water-soluble hydrothermal SAL (HSAL). Here, we show the improvement of HSAL on plant nutrient bioavailability and growth through its metal chelating capacity. We characterize HSAL’s high ratio of phenolic hydroxyl groups to methoxy groups and its capacity to chelate metal ions. Application of HSAL significantly promotes root length and plant growth of both monocot and dicot plant species due to improving nutrient bioavailability. The HSAL-mediated increase in iron bioavailability is comparable to the well-known metal chelator ethylenediaminetetraacetic acid. Therefore, HSAL promises to be a sustainable nutrient chelator to provide an attractive avenue for sustainable utilization of the waste lignin from the biorefinery industry.

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“…Особыми свойствами обладают нитрозированные LSA, которые приобретают свойства пептизатора [28,39]. Их применение позволяет осуществлять синтез МЖ на основе солей железа(II) [27].…”

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Nitration of Hydrolysis Lignin in Water-Aprotic Solvent Mixtures

Lakhmanov¹,

Хабаров²,

Вешняков³

et al. 2020

Lesnoy Zhurnal (Forestry Journal)

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Industrial lignins are formed from native lignins during chemical or biochemical processing of plant raw materials. Lignins can be modified to produce valuable products, including monomers, polymeric materials, and composites. The article presents the results of a study of hydrolysis lignin nitration under various conditions. The aim of the study was to obtain a nitrated hydrolysis lignin with a maximum yield and maximum nitrogen content. Therefore, the nitration was carried out using nitric acid in a water-aprotic solvent binary mixtures (1,4-dioxane, dimethyl sulfoxide, tetrahydrofuran, dimethylformamide, acetonitrile). Acetyl nitrate, which is a mixed anhydride of nitric and acetic acids, was also used as a nitrating agent. In this regard, the consumption of acetic anhydride in the synthesis of acetyl nitrate was used taking into account the water present in concentrated nitric acid. Acetyl nitrate was obtained by the reaction of acetic anhydride and concentrated nitric acid at room temperature for 30 min. Acetyl nitrate is a mild nitrating agent opposed to nitric acid. Nitration was carried out under reflux in a boiling water bath for 2–5 min (with nitric acid) or 1–60 min (with acetyl nitrate). Upon completion of the nitration reaction, the products were filtered, washed with distilled water and dried to constant weight without heating. When nitration was performed with nitric acid, the maximum yield of nitrated hydrolysis lignin (83–101 %) was achieved using 1,4-dioxane, acetonitrile, and tetrahydrofuran; and the maximum nitrogen content (4.3–4.5 %) was achieved using 1,4-dioxane or acetonitrile. The use of dimethyl sulfoxide and dimethylformamide leads to a decrease in the product yield to 23–35 %, to a lower nitrogen content of 1.3–3.9 % and an increased oxygen content, which indicates the occurrence of not only nitration, but also depolymerization and oxidative transformations. When nitration with acetyl nitrate, the reaction takes place for 1–3 min, herewith the product contains up to 4.7 % of nitrogen. On the IR spectra of nitrated hydrolysis lignins, new absorption bands appear at 1555 and 1710 cm–1 due to the appearance of carboxyl and nitro groups.

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Electrochemical synthesis and biological activity of iron lignosulfonate

Cited by 3 publications

References 26 publications

Exploring Caffeic Acid and Lignosulfonate as Key Phenolic Ligands for Metal-Phenolic Network Assembly

Exploring Caffeic Acid and Lignosulfonate as Key Phenolic Ligands for Metal-Phenolic Network Assembly

A lignin-derived material improves plant nutrient bioavailability and growth through its metal chelating capacity

Nitration of Hydrolysis Lignin in Water-Aprotic Solvent Mixtures

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