Chemical deacetylation natural xanthan (Jungbunzlauer®)
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...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Polímeros
2011-01-01
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| Series: | Polímeros |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282011000100011 |
| _version_ | 1818456769587838976 |
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| author | Ellen P. Pinto Lígia Furlan Claire T. Vendruscolo |
| author_facet | Ellen P. Pinto Lígia Furlan Claire T. Vendruscolo |
| author_sort | Ellen P. Pinto |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-14T22:31:56Z |
| format | Article |
| id | doaj.art-19542e2d70f540e38ceaa9a3ab3c8834 |
| institution | Directory Open Access Journal |
| issn | 0104-1428 1678-5169 |
| language | English |
| last_indexed | 2024-12-14T22:31:56Z |
| publishDate | 2011-01-01 |
| publisher | Associação Brasileira de Polímeros |
| record_format | Article |
| series | Polímeros |
| spelling | doaj.art-19542e2d70f540e38ceaa9a3ab3c88342022-12-21T22:45:14ZengAssociação Brasileira de PolímerosPolímeros0104-14281678-51692011-01-012114752Chemical deacetylation natural xanthan (Jungbunzlauer®)Ellen P. PintoLígia FurlanClaire T. VendruscoloWith 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282011000100011Natural xanthandeacetylationreaction parameters |
| spellingShingle | Ellen P. Pinto Lígia Furlan Claire T. Vendruscolo Chemical deacetylation natural xanthan (Jungbunzlauer®) Polímeros Natural xanthan deacetylation reaction parameters |
| title | Chemical deacetylation natural xanthan (Jungbunzlauer®) |
| title_full | Chemical deacetylation natural xanthan (Jungbunzlauer®) |
| title_fullStr | Chemical deacetylation natural xanthan (Jungbunzlauer®) |
| title_full_unstemmed | Chemical deacetylation natural xanthan (Jungbunzlauer®) |
| title_short | Chemical deacetylation natural xanthan (Jungbunzlauer®) |
| title_sort | chemical deacetylation natural xanthan jungbunzlauer r |
| topic | Natural xanthan deacetylation reaction parameters |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282011000100011 |
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