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USDA statistics from 1998 showed that more than 1.02 billion kilograms of mozzarella cheese and 621 million kilograms of yogurt were produced from S. thermophilus. [10] Although its genus, Streptococcus , includes some pathogenic species, food industries consider S. thermophilus a safer bacterium than many other Streptococcus species.
Yogurt production involves preparing warm milk to a temperature (30–45 °C (86–113 °F)) that will not kill the live microorganisms that turn the milk into yogurt, inoculating certain bacteria (starter culture), usually Streptococcus thermophilus and Lactobacillus bulgaricus, into the milk, and finally keeping it warm for several hours (4 ...
Lactobacillus acidophilus image taken with a scanning electron microscope (SEM). A Lactobacillus acidophilus culture. Lactobacillus acidophilus is an immobile rod-shaped (bacillus), gram-positive organism that ranges in size from 2-10 μm in size.
Both species produce lactic acid, [8] which gives yogurt its tart flavor and acts as a preservative. The resulting decrease in pH also partially coagulates the milk proteins, such as casein, resulting in yogurt's thickness. [9] [10] While fermenting milk, L. d. bulgaricus produces acetaldehyde, one of the main yogurt aroma components. [10]
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After that, the mix is cooled at a temperature of 0 to 4 °C (32 to 39 °F). Once it has reached the desired temperature and viscosity, the yogurt is allowed to sit in aging tanks for up to four hours. Sweeteners, flavorings, and colorings are then mixed in, and the yogurt mixture is cooled at a temperature of −6 to −2 °C (28 °F).
Greek yogurt is a source of magnesium, potassium and calcium — three nutrients emphasized in the Dietary Approach to Stop Hypertension (DASH) diet, which is a dietary pattern designed to stop ...
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