Study on rheological properties and application of chitosan solution
Rheological properties and application of chitosan solutions, in which the effects of internal factors ( molecular weight and degree of deacetylation) and external factors ( concentration, shear rate, temperature, pH and ionic strength)on viscosities of chitosan solution were studied. Results showed that viscosity increased with the increase of molecular weight and initially decreased and then increased with the increase of degree of deacetylation and pH, reached the minimum at 70.8％ within the range 60.5％ to 86.1％ and at pH 4.9 between 3.9 and 5.9 respectively. Viscosities of chitosan solution decreased with the increase of ionic strength excessively.Furthermore,chitosan solution exhibited shear thinning behavior following the power law model. Viscosity increased with the increase of concentration, and decreased with the increase of temperature. The decrease in viscosity (within 0～80℃)followed an Arrhenius temperature dependence, and the activation energy was 32.60kJ/mol. As food thickener, it is suitable to choose chitosan with higher molecular weight and higher degree of deacetylation and add into the acidic food systems containing low salt.
国家科技期刊平台
NSTL
万方数据
维普
