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1 Northeast Dairy Foods Research Center, Department of Food Science, Cornell University, Ithaca, NY 14853
The effect of milk preacidification with acetic or citric acid on the composition and yield of low fat Mozzarella cheese was determined. Two cheese manufacturing trials were conducted. In trial 1, three vats (230 kg of milk per vat) of cheese were made in 1 d using no preacidification (control) and preacidification to pH 6.0 and pH 5.8 with citric acid. In trial 2, four vats (230 kg of milk per vat) of cheese were made in 1 d using no preacidification (control), preacidification to pH 6.0 and 5.8 with acetic acid, and preacidification to pH 5.8 with citric acid. Cheese manufacture was repeated on three different days in trial 1 and four different days in trial 2 using a randomized-complete block design. Preacidification to pH 5.8 with citric acid decreased cheese calcium more than preacidification to pH 5.8 with acetic acid. Preacidification with citric acid in trial 1 decreased protein recovery in the cheese, and there was a trend for decreased protein recovery in the cheese for trial 2. Differences in fat recovery due to preacidification varied, sometimes being lower than the control other times being higher than the control. The reduction in calcium and protein recovery in the cheese caused by preacidification lowered composition adjusted cheese yield and yield efficiency. Yield efficiency was reduced by about 2.5 and 5.5%, respectively, with preacidification to pH 6.0 and 5.8 with citric acid. Yield efficiency was reduced by about 2.2 and 3.4%, respectively, with preacidification to pH 6.0 and pH 5.8 with acetic acid.
Key Words: low fat • Mozzarella cheese • preacidification • yield
Submitted on December 12, 1998
Accepted on November 11, 1999
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