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Bacterial fermentation of the lactose in milk produces lactic acid, which acts on milk protein to give yogurt its texture and tang.

Steps of yogurt fermentation:

Milk is heated to denature enzymes. Starter culture and other ingredients such as sugar are added to milk and mixture is incubated at 42 degrees C. During this step, the bacteria from the culture (lactobacillus and streptococcus) start to multiply and make lactic acid. The yoghurt is then cooled and refrigerated.

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11y ago

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