Study on viscosity properties of morus alba polysaccharide

The morus alba polysaccharide viscosity were measured using Brookfield viscometer, the effect of temperature, shear rate and pH value on the viscosity of morus alba polysaccharide were investigated. The results showed that morus alba polysaccharide solution was a pseudoplastic fluid, as the temperature increase the viscosity decreased gradually, and the relationship between temperature and viscosity was in line with Arrhenius model. The available mathematical model of temperature and concentration on the comprehensive effect of morus alba polysaccharides solution viscosity could predict by using η=-5.924 5exp(2.48/RT-0.1238C+3.421×10^-4C²), the scope of application was temperature 20~80℃, concentration 1%~8%; the effects of shear rate on viscosity could be fitting by Power law model η=Mγⁿ, viscosity decreased with increasing shear rate; The morus alba polysaccharide was a neutral polysaccharide when viscosity decreased under overly acid or alkali and the highest viscosity under neutral condition.