The influence of acidity on formation process of whey drink structures

The article introduces the research results of active and titratable acidity's influence on the limit tension of shift of whey drink depending on the mass fraction of pear puree, made from fruit grown up in the territory of the southern districts of the Amur region. It has been established that there is a growth of active and titratable acidity at introduction of puree from fruits pears in whey, which is associated with a high content of substances having acidic properties in this raw materials. The increase in acidity has occurred in proportion to the content of the pear puree in the product, accompanied by the increase in the values of the limiting shear stress. On the basis of the study results, it is found that the whey drink with fruit puree has a higher value of the maximum shear stress in comparison with whey and consequently it has higher strength of the product structure.