How Milk Becomes Yogurt

This is the first post of the blog, I’m going to touch base with you to talk about how milk becomes yogurt.

First, what is yogurt? FDA says:

Yogurt is the food produced by culturing one or more of the optional dairy ingredients with a characterizing bacterial culture that contains the lactic acid-producing bacteria, Lactobacillus bulgaricus and Streptococcus thermophilus.

Lactobacillus bulgaricusand and Streptococcus thermophilus are not yummy, but they are probiotics that get along with human body and help our organs to do a better job. Some probiotics live in stomach, they decompose glucose and lactose, make it more digestible for human body, they are called lactic acid bacteria. The major group of lactic acid bacteria is lactobacillus. Some Lactobacillus can be used to produce ferment food, they are the little magicians that transform milk to yogurt.

Step1: lactase breaks the complex structure of the lactose into pairs of molecules.

B1-1

Step 2: lactobacillus convert sugar and produce lactic acid

B1-2

Step 3: lactic Acid dissolves the shell of casein.

B1-3

Step 4: casein agglomerates and precipitates into curd.

B1-4

And so milk becomes yogurt!