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Microstructure and Rheological Properties of Iranian White Cheese Coagulated at Various Temperatures

A. Madadlou^*,1, A. Khosroshahi^*, S. M. Mousavi and Z. E. Djome

^* Urmia University, Food Science and Engineering, Urmia, Iran
Tehran University, Food Science and Engineering, Karadj, Iran

¹ Corresponding author: ashkan.madadlou{at}gmail.com

The effect of milk coagulation temperature on the composition, microstructure monitored using scanning electron micrographs, opacity measured by a Hunter lab system, and rheological behavior measured by uniaxial compression and small amplitude oscillatory shear were studied. Three treatments of Iranian White cheese were made by applying coagulation temperatures of 34, 37, and 41.5°C during the cheese-making procedure. A higher coagulation temperature resulted in increased fat and protein contents, and decreased the moisture content and ratio of moisture to protein. The highest temperature (41.5°C) had a significant effect on the opacity of Iranian White cheese. Milk coagulation at this temperature decreased the whiteness index (Hunter L value) and increased the yellowness index (Hunter b value) of the aged product compared with cheeses coagulated at lower temperatures. Microstructure of the cheese coagulated at 41.5°C was more compact and undisturbed, reflecting the higher values of stress at fracture and storage modulus measured for this treatment.

Key Words: Iranian White cheese • microstructure • rheology • opacity

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