Abstract
With the aim of adapting a method for removal of acetyl groups from xanthan, reactions of chemical deacetylation were carried out with natural xanthan (Jungbunzlauer®) with variations on the following parameters: biopolymer and alkali concentration (sodium and potassium hydroxide). The deacetylation reaction was performed at 25 oC for three hours. The proposed methodology was efficient to promote the deacetylation reaction. The viscosity of xanthan increased when the alkali concentration was higher in the deacetylation reaction. Xanthan concentration in the solution used in the deacetylation reaction did not influence the solutions viscosity, as similar results in both tested biopolymer concentrations (0.5 and 1%) were obtained for all experiments in different shear rates. Deacetylation reactions at 25 oC for three hours with sodium and potassium hydroxide in 0.01 mol.L-1 showed a viscosity of 410 and 420 mPa.s at 10 s-1 and acetylation degree 1.3 e 1.4%, respectively.
Highlights
Polysaccharides are the most abundant organic polymers research is needed to elucidate the true role of theseN obtained by biosynthesis and available worldwide from different groups in the xanthan rheological properties, in order to identify sources and with a variety of structures
Bacteria of the methodologies for the xanthan deacetylation, it would be genus Xanthomonas are responsible for the biosynthesis of the interesting to carry out an evaluation of the parameters for this extracellular polysaccharide denominated xanthan
Similar results were found by Bradshaw and collaborators[15], who used potassium hydroxide (0.015 mol.L–1) for 3 hours at room temperature under nitrogen for removing the acetyl groups from the commercial xanthan (Keltrol®) similar to the methodology used in this experiment
Summary
Polysaccharides are the most abundant organic polymers research is needed to elucidate the true role of theseN obtained by biosynthesis and available worldwide from different groups in the xanthan rheological properties, in order to identify sources and with a variety of structures. The samples of the deacetylated xanthan with sodium and potassium hydroxide were dialyzed following chemical deacetylation as it was previously described, in order to verify a possible salts influence on the deacetylated biopolymers final viscosities.
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