Sulfation of arabinogalactan with ammonium sulfamate

Kazachenko, Аleksandr S.; Vasilieva, Natalya; Malyar, Yuriy N.; Karacharov, Anton; Kondrasenko, Alexandеr A.; Levdanskiy, Aleksandr V.; Borovkova, Valentina S.; Miroshnikova, Angelina V.; Issaoui, Noureddine; Aldossary, Omar M.; Wójcik, Marek J.

doi:10.1007/s13399-021-02250-x

Cited by 18 publications

(11 citation statements)

References 49 publications

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“…The irregularity of the BG microstructure, in turn, indicates the amorphous nature of the product, which is confirmed by the BG XRD standard ( Figure 5 d), which presented a small peak at 2θ = 21.34°, followed by a broad plateau without peaks, a characteristic of amorphous materials. This pattern is similar to that observed for almond gum, gum arabic, and arabinogalactan [ 72 , 73 ].…”

Section: Resultssupporting

confidence: 87%

Structural and Thermal Characteristics of Buriti Tree Gum (Mauritia flexuosa)

et al. 2023

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A polysaccharide was isolated from the exudate of a buriti tree trunk (Mauritia flexuosa). The molecular structure, thermal stability, morphology, crystallinity, and elemental composition of the product were investigated through spectroscopic techniques, such as Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR 1H and 13C), and energy-dispersive X-ray spectroscopy (EDS); thermogravimetric analysis (TG), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and X-ray diffraction (XRD). In addition to NMR molecular modeling studies, were performed to confirm the 1H and 13C chemical shifts to Gal and Xyl conformers. Buriti tree gum (BG) is an arabinogalactan, containing Rha, Ara, Xyl, and Gal, and degrades almost completely (98.5%) at 550 °C and has a maximum degradation peak at 291.97 °C, with a mass loss of 56.33%. In the temperature range of 255–290 °C, the energy involved in the BG degradation process was approximately 17 J/g. DSC indicated a glass transition temperature of 27.2 °C for BG, which had an irregular and heterogeneous morphology, with smooth or crumbling scaly regions, demonstrating the amorphous nature of BG that was confirmed by the XRD standard. EDS revealed the presence of carbon and oxygen, as well as calcium, magnesium, aluminum, silicon, chlorine, and potassium, in the BG composition.

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Section: Resultssupporting

confidence: 87%

Structural and Thermal Characteristics of Buriti Tree Gum (Mauritia flexuosa)

et al. 2023

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“…In contrast, although the Na-LS comprises several OH groups that may potentially form hydrogen bonds with lignin polymers, the excess of negative charges in Na-LS inhibits aggregation due to electrostatic repulsion, giving the Na-LS a lighter color. It has been reported that incorporating a sulfonate or sulfate group can cause polymer aggregation owing to an increase in inter and intramolecular interactions [ 24 ].…”

Section: Resultsmentioning

confidence: 99%

Chemical and Thermal Characteristics of Ion-Exchanged Lignosulfonate

Wibowo

Park

2023

Molecules

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Lignosulfonate features sulfonate groups, which makes it soluble in water and hence, suitable for a wide range of applications. However, its characterization is challenging because of its limited solubility in organic solvents. Thus, this study investigated the chemical and thermal characteristics of ion-exchanged sodium lignosulfonate (Na-LS) and compared it with those of industrial kraft lignin derived from softwood and hardwood. The results demonstrated that the ion exchange successfully converted Na-LS to lignosulfonic acid (H-LS), as proven by the Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and elemental analysis. H-LS has a greater apparent molecular weight than those of Na-LS and softwood and hardwood kraft lignin (SKL and HKL). According to 31P nuclear magnetic resonance (NMR) analysis, H-LS has less phenolic OH than SKL and HKL, indicating that it has more polymeric chains. Furthermore, H-LS has substantially more native side chains, such as β-O-4 units, than SKL and HKL. Thermal analysis revealed that H-LS has a greater glass temperature (Tg) than SKL and HKL, although Na-LS has a lower Tg than SKL and HKL. In addition, H-LS degraded faster than Na-LS did because the acid condition accelerated degradation reaction.

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“…At the same time, the length of this bond in aqueous ammonium sulfamate clusters [ 22 ] ranges from 1.6851 to 1.6975 Å, while with an increase in the number of water molecules from one to four, the S–N bond extends. Despite the data obtained, it has not been explained by a quantum-chemical approach yet why urea is a less efficient activator when arabinogalactan is sulfated with ammonium sulfamate [ 37 ] than when it is sulfated with sulfamic acid [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Study of the Ammonium Sulfamate–Urea Binary System

et al. 2023

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The physicochemical properties of binary systems are of great importance for the application of the latter. We report on the investigation of an ammonium sulfamate–urea binary system with different component ratios using a combination of experimental (FTIR, XRD, TGA/DSC, and melting point) and theoretical (DFT, QTAIM, ELF, RDG, ADMP, etc.) techniques. It is shown that, at a temperature of 100 °C, the system under study remains thermally and chemically stable for up to 30 min. It was established using X-ray diffraction analysis that the heating time barely affects the X-ray characteristics of the system. Data on the aggregate states in specified temperature ranges were obtained with thermal analysis and determination of the melting point. The structures of the ammonium sulfamate–urea system with different component ratios were optimized within the density functional theory. The atom-centered density matrix propagation calculation of the ammonium sulfamate–urea system with different component ratios was performed at temperatures of 100, 300, and 500 K. Regardless of the component ratio, a regular increase in the potential energy variation (curve amplitude) with an increase in temperature from 100 to 500 K was found.

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Sulfation of arabinogalactan with ammonium sulfamate

Cited by 18 publications

References 49 publications

Structural and Thermal Characteristics of Buriti Tree Gum (Mauritia flexuosa)

Structural and Thermal Characteristics of Buriti Tree Gum (Mauritia flexuosa)

Chemical and Thermal Characteristics of Ion-Exchanged Lignosulfonate

Comprehensive Study of the Ammonium Sulfamate–Urea Binary System

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