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📘 Milk starts with lactose and proteins

Milk is a water-based mixture carrying lactose, minerals, fat, and proteins.

3
lessons
~15 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Starting the cultureIdentify milk components, starter bacteria, and preparation steps.Yogurt begins with milk, heat treatment, cooling, and a living culture ready to ferment lactose.
  2. Acid and gel formationTrace lactose metabolism, pH decline, and casein coagulation.Bacteria convert lactose to acid, changing proteins from a liquid suspension into a gel with flavor compounds.
  3. Taste and storageConnect flavor development, cooling, and the complete transformation.Time and temperature set tartness and texture; refrigeration stabilizes the finished yogurt.

Questions this course answers

What milk sugar do yogurt bacteria mainly ferment?

Lactose is the characteristic sugar in milk that the starter converts into lactic acid.

Why is milk cooled before starter is added?

The starter needs a warm growth range, while excessive heat can injure or kill its bacteria.

What happens to pH as lactic acid accumulates?

More acid makes the milk more acidic, which means a lower pH.

What creates yogurt's gel network?

Acidification changes casein interactions so the proteins assemble into a water-holding network.

Why can yogurt become more tart during longer incubation?

Longer warm fermentation can allow more acid production before cooling slows the culture.

What is the main effect of refrigeration after yogurt sets?

Cold storage slows the starter and helps preserve the chosen acidity and texture.

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