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Details for article 3 of 9 found articles
| Title: |
EFFECTS OF ADDITIVES AND INERT GAS BUBBLING ON THE DEACETYLATION OF CHITOSAN |
| Author: |
Campana-Filho, Sergio Paulo Signini, Roberta |
| Appeared in: |
International journal of polymeric materials |
| Paging: | Volume 51 (2002) nr. 8 pages 701-709 |
| Year: |
2002-08 |
| Contents: |
Commercial chitosan was purified, dissolved in 1.5% acetic acid and then submitted to deacetylation in aqueous sodium hydroxide solution at 110°C during 3 h. Different conditions were employed to minimize the simultaneous occurrence of depolymerization, including the bubbling of nitrogen through the reaction medium and/or the addition of sodium borohydride or anthraquinone. Severe depolymerization occurred except when some measure was taken to minimize it. However more acetylated products resulted in these conditions. Adding anthraquinone and/or bubbling nitrogen through the reaction medium resulted in less degraded chitosans but the addition of sodium borohydride was not so effective. The more deacetylated and less degraded products were obtained when purified chitosan acetate was submitted to deacetylation in the presence of anthraquinone and simultaneous bubbling of nitrogen. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 3 of 9 found articles
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