Explain the lukewarm and lactic acid which are present in milk with
Good explanation plzz.....

Dear student,
Your question is not clear. However, I am answering according to what I understood from the query you have put up. Please find below the answer:

Milk contains a sugar called Lactose sugar (which is made by the glycosidic linkage between glucose and galactose). Raw milk also naturally contains Lactobacillus bacteria. This bacteria can convert sugars into lactic acid by the process of fermentation.
When milk is heated to a temperature of 30-40 degrees and a small amount of old curd is added to it, the bacteria Lactobacillus which is present in that curd starts to grow, thus converting the lactose into lactic acid. Lactic acid denatures the structure of the protein (Caesin) present in milk and thus the protein coagulates, giving a thick texture to the milk, which is called curd.

Hope this information clears your doubt.
Regards.
 

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