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* Dairy Products Technology Center,
Statistics Department, California Polytechnic State University, San Luis Obispo 93407;
Southeast Dairy Research Center, Department of Food Science, North Carolina State University, Raleigh 27695
Corresponding author: N. Y. Farkye; e-mail:
nfarkye{at}calpoly.edu.
Commercial milk protein concentrate (MPC) was used to standardize whole milk for reduced-fat Cheddar cheesemaking. Four replicate cheesemaking trials of three treatments (control, MPC1, and MPC2) were conducted. The control cheese (CC) was made from standardized milk (casein-to-fat ratio, C/F ~1.7) obtained by mixing skim milk and whole milk (WM); MPC1 and MPC2 cheeses were made from standardized milk (C/F ~1.8) obtained from mixing WM and MPC, except that commercial mesophilic starter was added at the rate of 1% to the CC and MPC1 and 2% to MPC2 vats. The addition of MPC doubled cheese yields and had insignificant effects on fat recoveries (~94% in MPC1 and MPC2 vs. ~92% in CC) but increased significantly total solids recoveries (~63% in CC vs. 63% in MPC1 and MPC2). Although minor differences were noted in the gross composition of the cheeses, both MPC1 and MPC2 cheeses had lower lactose contents (0.25 or 0.32%, respectively) than in CC (0.60%) 7 d post manufacture. Cheeses from all three treatments had ~109 cfu/g initial starter bacteria count. The nonstarter lactic acid bacteria (NSLAB) grew slowly in MPC1 and MPC2 cheeses during ripening compared to CC, and at the end of 6 mo of ripening, numbers of NSLAB in the CC were 1 to 2 log cycles higher than in MPC1 and MPC2 cheeses. Primary proteolysis, as noted by water-soluble N contents, was markedly slower in MPC1 and MPC2 cheeses compared to CC. The concentrations of total free amino acids were in decreasing order CC > MPC2 > MPC1 cheeses, suggesting slower secondary proteolysis in the MPC cheeses than in CC. Sensory analysis showed that MPC cheeses had lower brothy and bitter scores than CC. Increasing the amount of starter bacteria improved maturity in MPC cheese.
Key Words: Milk protein concentrate powder • proteolysis • reduced-fat Cheddar
Abbreviation key: CC = control cheese, FDM = fat in DM, MPC = milk protein concentrate, NSLAB = nonstarter lactic acid bacteria, RFC = reduced-fat cheddar, SM = skim milk, SMP= skim milk powder, WM = whole milk, WSF = water-soluble fraction
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