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Northeast Dairy Foods Research Center Department of Food Science, Cornell University, Ithaca, NY 14853
Corresponding author:
D. M. Barbano; e-mail:
dmb37{at}cornell.edu.
The effect of microfiltration (MF) on the composition of Cheddar cheese, fat, crude protein (CP), calcium, total solids recovery, and Cheddar cheese yield efficiency (i.e., composition adjusted yield divided by theoretical yield) was determined. Raw skim milk was microfiltered twofold using a 0.1-µm ceramic membrane at 50°C. Four vats of cheese were made in one day using milk at 1x, 1.26x, 1.51x, and 1.82x concentration factor (CF). An appropriate amount of cream was added to achieve a constant casein (CN)-to-fat ratio across treatments. Cheese manufacture was repeated on four different days using a randomized complete block design. The composition of the cheese was affected by MF. Moisture content of the cheese decreased with increasing MF CF. Standardization of milk to a constant CN-to-fat ratio did not eliminate the effect of MF on cheese moisture content. Fat recovery in cheese was not changed by MF. Separation of cream prior to MF, followed by the recombination of skim or MF retentate with cream resulted in lower fat recovery in cheese for control and all treatments and higher fat loss in whey when compared to previous yield experiments, when control Cheddar cheese was made from unseparated milk. Crude protein, calcium, and total solids recovery in cheese increased with increasing MF CF, due to partial removal of these components prior to cheese making. Calcium and calcium as a percentage of protein increased in the cheese, suggesting an increase in calcium retention in the cheese with increasing CF. While the actual and composition adjusted cheese yields increased with increasing MF CF, as expected, there was no effect of MF CF on cheese yield efficiency.
Key Words: Cheddar cheese • microfiltration • concentration factor • yield
Abbreviation key: CF = concentration factor, FDB = fat on a dry basis, HCF = high concentration factor, LCF = low concentration factor, MCF = medium concentration factor, MF = microfiltration, MNFS = moisture in the nonfat substance, PDB = protein on a dry basis, SEF = solute exclusion factor, SM = standardized milk, TN = total nitrogen
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