Xylan sulphate films

Simkovic, I; Gedeon, Ondrej; Uhliariková, Iveta; Mendichi, Raniero; Kirschnerová, Soňa

doi:10.1016/j.carbpol.2011.04.034

Cited by 22 publications

(5 citation statements)

References 8 publications

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“…However, at this temperature (500°C) more than 40 wt.% of sulfated xylan was left. This analysis confirmed that sulfated xylan was more thermally stable than unmodified xylan, and the higher thermal stability was related to the attachment of sulfate groups to xylan in sulfated xylan . Figure also showed that sulfated xylan had a more rapid weight loss at 650°C, which is ascribed to the degradation of the sodium sulfate groups in sulfated xylan …”

Section: Resultsmentioning

confidence: 54%

“…As reported earlier, the unmodified xylan also contained 4‐O‐methyl‐d‐glucuronic acid units attached to C 2 (peak at 3.47 ppm for CH 3 –O–, peak at 2.64 ppm for carboxyl group in glucuronic acid unit). In comparison with the spectrum of xylan, the sulfated xylan had peaks at 3.64 ppm for C 2 ‐H, 4.34 ppm for C 3 ‐H, 3.97 ppm for C 4 ‐H, 3.42 ppm for C 5 ‐H 2 , 4.24 ppm for H ax of CH 2 with H eq of CH 2 in C 5 , and 4.68 ppm for C 1 ‐H . The peaks shifted for sulfated xylan compared to those of unmodified xylan accounting for the existence of sodium sulfate groups in sulfated xylan.…”

Section: Resultsmentioning

confidence: 98%

“…The peaks shifted for sulfated xylan compared to those of unmodified xylan accounting for the existence of sodium sulfate groups in sulfated xylan. This method was used for confirming the success of sulfation reaction in the past …”

Section: Resultsmentioning

confidence: 99%

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Preparation and application of sulfated xylan as a flocculant for dye solution

Kong

et al. 2018

Biotechnology Progress

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The main purpose of this study is to explore the sulfation of xylan to produce an anionic flocculant, sulfated xylan, for removing ethyl violet dye from simulated dye solutions. In this work, xylan was sulfated with chlorosulfonic acid in N, N-dimethylformamide solvent and the reaction conditions were optimized using a response surface methodology. It was observed that the maximum degree of substitution of 1.1 was obtained for sulfated xylan under the conditions of 3.71 chlorosulfonic acid/xylan molar ratio, 70°C and 7 h reaction time. The resulting sulfated xylan had a charge density of -3.12 mmol/g and molecular weight (M ) of 22,300 g/mol. Furthermore, elemental and thermogravimetric analyses, Fourier transform infrared spectroscopy and proton nuclear magnetic resonance ( H-NMR) confirmed the sulfation of xylan. The application of sulfated xylan as a flocculant for decolorizing the simulated ethyl violet dye wastewater was studied. The results indicated that 97% of dye was removed from 50 mg/L dye solution at the sulfated concentration of 175 mg/L and pH 9, but unmodified xylan was ineffective in flocculating and removing dye segments. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 34:529-536, 2018.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 98%

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Preparation and application of sulfated xylan as a flocculant for dye solution

Kong

et al. 2018

Biotechnology Progress

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“…It is possible that this characteristic inorganic peak is due to sulfated residues. Simkovic et al (2011) showed that sulfation of xylan had sulfur incorporated into the residual C leading to a peak of ;7908C under pyrolysis. Sulfation of polysaccharides is a common adaptation for marine plants, normally absent in terrestrial and freshwater plants, to aid in ionic balance (Kloareg and Quatrano 1988) and allelochemical interactions (McMillan et al 1980; see also Discussion: Variability in macroalgae).…”

Section: Variability In Vascular Plantsmentioning

confidence: 99%

Comparison of marine macrophytes for their contributions to blue carbon sequestration

Trevathan-Tackett

Kelleway

Macreadie

et al. 2015

Ecology

193

134

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Many marine ecosystems have the capacity for long-term storage of organic carbon (C) in what are termed "blue carbon" systems. While blue carbon systems (saltmarsh, mangrove, and seagrass) are efficient at long-term sequestration of organic carbon (C), much of their sequestered C may originate from other (allochthonous) habitats. Macroalgae, due to their high rates of production, fragmentation, and ability to be transported, would also appear to be able to make a significant contribution as C donors to blue C habitats. In order to assess the stability of macroalgal tissues and their likely contribution to long-term pools of C, we applied thermogravimetric analysis (TGA) to 14 taxa of marine macroalgae and coastal vascular plants. We assessed the structural complexity of multiple lineages of plant and tissue types with differing cell wall structures and found that decomposition dynamics varied significantly according to differences in cell wall structure and composition among taxonomic groups and tissue function (photosynthetic vs. attachment). Vascular plant tissues generally exhibited greater stability with a greater proportion of mass loss at temperatures > 300 degrees C (peak mass loss -320 degrees C) than macroalgae (peak mass loss between 175-300 degrees C), consistent with the lignocellulose matrix of vascular plants. Greater variation in thermogravimetric signatures within and among macroalgal taxa, relative to vascular plants, was also consistent with the diversity of cell wall structure and composition among groups. Significant degradation above 600 degrees C for some macroalgae, as well as some belowground seagrass tissues, is likely due to the presence of taxon-specific compounds. The results of this study highlight the importance of the lignocellulose matrix to the stability of vascular plant sources and the potentially significant role of refractory, taxon-specific compounds (carbonates, long-chain lipids, alginates, xylans, and sulfated polysaccharides) from macroalgae and seagrasses for their long-term sedimentary C storage. This study shows that marine macroalgae do contain refractory compounds and thus may be more valuable to long-term carbon sequestration than we previously have considered.

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“…In this approach, hemicelluloses represent many promising properties for the manufacture of value-added polymeric composites and blends, which could replace materials currently manufactured from fossil resources or even metals, such as aluminum (Alekhina et al 2014). Natural biopolymers are considered to have many advantageous properties when compared to their synthetic counterparts, as they are abundant, low-cost, biocompatible, nontoxic, biodegradable, and environmentally safe (Peng et al 2011b;Šimkovic et al 2011). Of the several possible hemicelluloses-derived polymeric applications, the manufacture of various polymeric films and hydrogels has garnered the most interest.…”

Section: Polysaccharide-based Biodegradable Films and Hydrogelsmentioning

confidence: 99%

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

Lehto

Alén

2015

BioResources

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The chemical industry is being forced to evaluate new strategies for more effective utilization of renewable feedstocks to diminish the use of fossil resources. In this literature review, the integration of both acidic and alkaline pretreatment phases of hardwood and softwood chips with chemical pulping is discussed. Depending on the pretreatment conditions, high-volume sulfur-free fractions with varying chemical compositions can be produced. In case of acidic pretreatments, the major products include carbohydrates (mono-, oligo-, and polysaccharides), whereas under alkaline (i.e., aqueous NaOH) pretreatment conditions, the sulfur-free fractions of aliphatic carboxylic acids, lignin, and extractives are primarily obtained. All these fractions are potentially interesting groups of compounds and can be used in a number of applications. Finally, the effects of pretreatments on pulping are also considered. Although it is believed that there are important advantages to be gained by integrating this type of renewable raw material-based production, in particular, with kraft pulping, sulfur-free pulping methods such as soda-AQ and oxygen/alkali delignification processes are also briefly discussed.

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Xylan sulphate films

Cited by 22 publications

References 8 publications

Preparation and application of sulfated xylan as a flocculant for dye solution

Preparation and application of sulfated xylan as a flocculant for dye solution

Comparison of marine macrophytes for their contributions to blue carbon sequestration

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

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