Influence of curd particles washing on the composition of curd made of milk in which coaggregates were formed
2004
Jovanovic, S. | Macej, O. | Denin-Djurdjevic, J. (Faculty of Agriculture, Belgrade - Zemun (Serbia and Montenegro). Department of Food Technology and Biochemistry)
The composition of curd A and curd B was investigated as influenced by the technological process known as curd washing after removing 1/3 or 1/2 of whey and replacing by the same volume of water at the drying temperatures of 42 deg C and 45 deg C, respectively. Milk used for experiments was heat-treated at 87 deg C/10 min, during which the chemical complex between casein and whey proteins (milk protein coaggregates) was formed. It is shown that the applied drying temperatures of 42 deg C (curd A) and 45 deg C (curd B) do not have significant influence on the curd composition. The curd A and B gained without washing of the curd had 50.91% and 50.60% of moisture, respectively. If the curd washing process is applied after removing 1/3 of whey, the resulting curd has higher moisture content, 52.27% and 52.63%, respectively, for the curd A and B. The highest moisture content in the curd is noted in the curd gained when 1/2 of whey is replaced by water during washing treatment. The same tendency is noted for the moisture in fat-free basis (MFFB), the parameter used for cheese classification. Also, it is observed that fat, protein and ash content are lower in the curd A and B when the curd washing process is applied than in the curd produced without the curd washing process. However, regardless of the increased moisture content of the curd gained by washing process, it is possible (even from heat-treated milk in which coaggregates are formed) to achieve the average MFFB typical for semi-hard cheeses of Dutch type, by further technological processes, such as molding, pressing, salting and ripening.
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