Study on rheological properties of potato pulp pectin
WANG Wenxia*, YANG Yue, ZHANG Huijun, LIU Bo, XU Tingting
(College of Food and Biology Engineering,Qiqihaer university,Vegetable and Grain Beverage Engineering Technology Research Center of Heilongjiang Province,Key Laboratory of Pressing Agricutural Products of Heilongjiang Province,Qiqihaer 161006,China)
Abstract: Rheological properties of potato pectin (PPCH) and the factors,such as pectin concentration,shear rate,temperature,pH value,metalions on rheological properties were investigated.The results showed that the increased pectin concentration resulted in the increase of solution viscosity.However,with the increase of shear rate,the solution viscosity was reduced.Moreover,the shear-thinning became more obvious with the increase of pectin concentration,which could be attributed to non-Newtonian fluid.The rheological behavior of PPCH solution was affected by temperature.At specific shear rates(50 s-1),the viscosity of PPCH solution decreased rapidly with the increase of temperature in range from 10 ℃ to 47 ℃.In addition,the viscosity of PPCH solution fluctuated slowly with the temperature increasing in the range from 47 ℃ to 65 ℃,and the viscosity of PPCH solution decreased slowly as the temperature increase in the range from 65 ℃ to 80 ℃.At specific shear rates(100,500 s-1),the viscosity of PPCH solution decreased slowly with the increase of temperature.In the temperature range from 10 ℃ to 47 ℃,the activation energy of PPCH solution had a greater correlation with the shear rate.In the temperature range from 47 ℃ to 80 ℃,the activation energy had a smaller correlation with the shear rate.The rheological properties of the PPCH solution were influenced greatly by pH value.Besides,the viscosity of pectin solution increased first and then decreased with the increase of pH value.And at pH 4.0,pectin solution had the lowest viscosity and the lowest fluidity.Divalent metalions obviously improved the viscosity of PPCH solution.Compared with Mg2+,Ca2+ could significantly increase PPCH solution viscosity.
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