Effects of heat treatment and pH-induced on some functional properties of yak casein

Effects of pH and heat treatment on the functional properties of yak casein were studied.Results showed that the functional properties of yak casein were dependent of pH and temperature.The yak casein Had a higher solubility,emulsibility,thermal stability and hydrophobicity when pH reached 6.6 and far from denaturation temperature(140 ℃).When the acidity reached 6.8,the temperature close to its denaturation temperature,due to the aggregation of casein and the degree of denaturation of the yak casein increased,the functional properties(solubility,emulsibility,thermal stability and hydrophobicity) of casein had a lowest values.