Chemical deacetylation natural xanthan (Jungbunzlauer®)

Pinto, Ellen P.; Furlan, Lígia; Vendruscolo, Claire Tondo

doi:10.1590/s0104-14282011005000005

Cited by 18 publications

(8 citation statements)

References 26 publications

(43 reference statements)

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“…FucoPol deacetylation and desuccinylation studies under alkaline conditions were based on the procedures described by Pinto et al [ 22 ] and Lima et al [ 24 ], by subjecting the polysaccharide to different NaOH concentrations (0.005, 0.01, 0.02, and 0.05 M), temperatures (40 and 60 °C), and reaction times (15, 30 and 60 min). Briefly, the FucoPol samples (5 mg) were dissolved in deionized water (5 mL) and contacted with NaOH, under a controlled temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Depyruvylation studies were undertaken on the deacetylated/desuccinylated FucoPol by its hydrolysis with hydrochloric or oxalic acids, following the procedures described by Pinto et al [ 22 ] and Herasimenka et al [ 25 ], respectively. Hydrolysis was achieved using FucoPol solution (1.0 wt%) in hydrochloric acid (2.0 M) at 80 °C for 16 h. The hydrolysis with oxalic acid (0.5 M) was performed using FucoPol solution (0.1 wt%) at 100 °C for 2 h. The samples were dialysed and freeze-dried as described above.…”

Section: Methodsmentioning

confidence: 99%

“…For chitin deacetylation, Kjartansson et al [ 20 ] used 12.5 M NaOH treatment for 4 h at 100 °C. Pinto et al [ 22 ] used NaOH and KOH 0.01 M at 25 °C for 3 h to obtain deacetylated xanthan gum.…”

Section: Introductionmentioning

confidence: 99%

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Deacetylation and Desuccinylation of the Fucose-Rich Polysaccharide Fucopol: Impact on Biopolymer Physical and Chemical Properties

Baptista¹,

Araújo

Concórdio‐Reis³

et al. 2022

Molecules

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FucoPol is an acylated polysaccharide with demonstrated valuable functional properties that include a shear thinning fluid behaviour, a film-forming capacity, and an emulsion forming and stabilizing capacity. In this study, the different conditions (concentration, temperature, and time) for alkaline treatment were investigated to deacylate FucoPol. Complete deacetylation and desuccinylation was achieved with 0.02 M NaOH, at 60 °C for 15 min, with no significant impact on the biopolymer’s sugar composition, pyruvate content, and molecular mass distribution. FucoPol depyruvylation by acid hydrolysis was attempted, but it resulted in a very low polymer recovery. The effect of the ionic strength, pH, and temperature on the deacetylated/desuccinylated polysaccharide, d-FucoPol, was evaluated, as well as its emulsion and film-forming capacity. d-FucoPol aqueous solutions maintained the shear thinning behaviour characteristic of FucoPol, but the apparent viscosity decreased significantly. Moreover, contrary to FucoPol, whose solutions were not affected by the media’s ionic strength, the d-FucoPol solutions had a significantly higher apparent viscosity for a higher ionic strength. On the other hand, the d-FucoPol solutions were not affected by the pH in the range of 3.6–11.5, while FucoPol had a decreased viscosity for acidic pH values and for a pH above 10.5. Although d-FucoPol displayed an emulsification activity for olive oil similar to that of FucoPol (98 ± 0%) for an oil-to-water ratio of 2:3, the emulsions were less viscous. The d-FucoPol films were flexible, with a higher Young′s modulus (798 ± 152 MPa), a stress at the break (22.5 ± 2.5 MPa), and an elongation at the break (9.3 ± 0.7%) than FucoPol (458 ± 32 MPa, 15.5 ± 0.3 MPa and 8.1 ± 1.0%, respectively). Given these findings, d-FucoPol arises as a promising novel biopolymer, with distinctive properties that may render it useful for utilization as a suspending or emulsifier agent, and as a barrier in coatings and packaging films.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Deacetylation and Desuccinylation of the Fucose-Rich Polysaccharide Fucopol: Impact on Biopolymer Physical and Chemical Properties

Baptista¹,

Araújo

Concórdio‐Reis³

et al. 2022

Molecules

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“…First order degradation rate-constants were 0.023 ± 0.017 and 0.036 ± 0.021 h -1 for 1,2,3-TCB and 1,2,4-TCB, respectively, and the calculated half-lives amounted to 25h. Even if the mechanism of TCBs degradation is unclear, deacetylation of xanthan 22 which takes place at pH > 9, may produce an e-donor compound, required for the reductive hydrogenolysis of the chlorobenzenes [76][77][78]. Furthermore, air-sparging is also effective to remove TCBs from the contaminated GW, given their Henry constants and vapor pressures [79].…”

Section: Kinetics and Mechanisms Of Contaminants Degradationmentioning

confidence: 99%

Controlled treatment of a high velocity anisotropic aquifer model contaminated by hexachlorocyclohexanes

Bouzid

Maire

Laurent

et al. 2021

Environmental Pollution

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“…Among the well-known xanthan derivatives we distinguish: O-carboxymethyl XG [6], cationic [7,8] and amphoteric XG [9], hexadecyl XG [10], deacetylated XG [11], octyl XG [12], butyl XG [13], succinoyl XG [14], various forms of oxidized XG [2,[15][16][17], and others. Modification of xanthan leads to the production of derivatives with specified characteristics of hydrophilic-hydrophobic properties for use in various fields.…”

Section: Introductionmentioning

confidence: 99%

Food Xanthan Polysaccharide Sulfation Process with Sulfamic Acid

Kazachenko

Vasilieva

Borovkova

et al. 2021

Foods

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Xanthan is an important polysaccharide with many beneficial properties. Sulfated xanthan derivatives have anticoagulant and antithrombotic activity. This work proposes a new method for the synthesis of xanthan sulfates using sulfamic acid. Various N-substituted ureas have been investigated as process activators. It was found that urea has the greatest activating ability. BBD of xanthan sulfation process with sulfamic acid in 1,4-dioxane has been carried out. It was shown that the optimal conditions for the sulfation of xanthan (13.1 wt% sulfur content) are: the amount of sulfating complex per 1 g of xanthan is 3.5 mmol, temperature 90 °C, duration 2.3 h. Sulfated xanthan with the maximum sulfur content was analyzed by physicochemical methods. Thus, in the FTIR spectrum of xanthan sulfate, in comparison with the initial xanthanum, absorption bands appear at 1247 cm−1, which corresponds to the vibrations of the sulfate group. It was shown by GPC chromatography that the starting xanthan gum has a bimodal molecular weight distribution of particles, including a high molecular weight fraction with Mw > 1000 kDa and an LMW fraction with Mw < 600 kDa. It was found that the Mw of sulfated xanthan gum has a lower value (~612 kDa) in comparison with the original xanthan gum, and a narrower molecular weight distribution and is characterized by lower PD values. It was shown by thermal analysis that the main decomposition of xanthan sulfate, in contrast to the initial xanthan, occurs in two stages. The DTG curve has two pronounced peaks, with maxima at 226 and 286 °C.

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Chemical deacetylation natural xanthan (Jungbunzlauer®)

Cited by 18 publications

References 26 publications

Deacetylation and Desuccinylation of the Fucose-Rich Polysaccharide Fucopol: Impact on Biopolymer Physical and Chemical Properties

Deacetylation and Desuccinylation of the Fucose-Rich Polysaccharide Fucopol: Impact on Biopolymer Physical and Chemical Properties

Controlled treatment of a high velocity anisotropic aquifer model contaminated by hexachlorocyclohexanes

Food Xanthan Polysaccharide Sulfation Process with Sulfamic Acid

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