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Chitosan dichloro acetic acid salts

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Wojtasz-Pająk A.
Progress on Chemistry and Application of Chitin and its Derivatives
|
2010
|
vol. 15
55 - 62
EN
The salts of dichloroacetic acid were obtained from chitosans of different deacetylation degrees (69÷97%) and viscosity-average molecular weights (61÷327 kDa). The mole ratio of dichloroacetic acid to amine groups was 1. The chemical and physical properties of the salts were evaluated by determining the dry weight, the content of ash, acid, insoluble substances, kinematic viscosity, and pH. The studied salts had a low contents of water (<10%), inorganic pollutants (<0.2%), and a low insoluble substances fraction (<0.15%). The determined acid content was similar to the theoretical content. The physical properties of the chitosan influenced the kinematic viscosity of the salt solutions. The kinematic viscosity decreased when the viscosity-average molecular weights of the chitosan decreased. The properties of chitosan did not significantly impact the pH of the salt solutions. This depended on the pKa of the acid. The chemical and physical properties of the salts can be altered by neutralizing the dichloroacetate solutions to a pH at which no distinct change in clarity occurs.
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