Why spoiled milk becomes bitter: When it's hard not to notice that you shouldn't drink it

19.06.2023 07:40
Updated: 13.05.2024 21:25

While in most cases, spoiled milk tastes sour, it can also suddenly become extremely bitter.

It doesn't happen too often, but when it does, then it's a great sign that you shouldn't drink it or use it while cooking.

Here are some reasons for that bitter taste.

Proteolysis

When milk spoils, bacteria can break down proteins present in the milk into smaller components. 

This process, known as proteolysis, can result in the formation of bitter-tasting peptides and amino acids.

milk
Photo:Pixabay

Lipolysis

Bacteria can also break down fats present in milk through a process called lipolysis. 

This breakdown can produce free fatty acids, which can contribute to a bitter taste.

Specific bacteria strains

Some bacterial strains that grow in spoiled milk are known to produce bitter-tasting compounds. 

For example, certain species of Pseudomonas and Alcaligenes bacteria have been associated with the production of bitter flavors in spoiled milk.

Consuming spoiled milk is generally not recommended as it can lead to foodborne illnesses and digestive discomfort. 

It's always advisable to check the freshness of milk before consumption and discard it if it appears or tastes spoiled. 

Proper storage of milk in the refrigerator at the recommended temperature can help extend its freshness and prevent spoilage.
 

Kate Yakimchuk Author: Kate Yakimchuk Editor internet resource


Content
  1. Proteolysis
  2. Lipolysis
  3. Specific bacteria strains