Types of bacteria found in milk and milk products

1. The acid producing: –

• It is responsible for conversion of lactose into lactic acid.

• Streptococcus lactis
• Streptococcus cremoris
• Lactobacillus acidophillus
• Lactobacillus bulgaricus
• Lactobacillus thermophillus

2. Aroma producing bacteria: –

• They are responsible for the production of desirable aroma and flavor in milk product.

• Streptococcus citrovorus
• Streptococcus paracitrovorus
• Streptococcus diacetilactis

3. Gas producing bacteria: –

• These are undesirable type of bacteria ferment lactose and produce acid & gas.

• Eschericha coli
• Aerobacter acrogenes

4. Peptonizing type of bacteria: –

• The bacteria, which show a tendency to break down the casein by a process known as proteolysis or peptonization.

• Bacillus subtilis
• Bacillus mesentericus
• Bacillus cereces
• Bacillus mycoides
• Bacillus noves
• Bacillus magatherium

5. Ropiness type of bacteria: –

• These are a number of bacteria, which are able to bring about a peculiar change in milk, or these organisms form gum-like substance.

• Alligenes viscosus
• Alcaligenes viscolactis

6. Toxins producing bacteria: –

• These bacteria are producing poisonous compounds in the dairy products known as toxins.