FERMENTED MILK (BUTTERMILK)

 

FERMENTED MILK (BUTTERMILK)



Introduction

Fermented milk products are obtained by the controlled fermentation of milk using specific microorganisms that convert lactose into lactic acid. Buttermilk is a popular fermented milk product known for its low fat content, mild acidity, refreshing taste, and high digestibility. Traditionally, buttermilk was the liquid residue left after churning butter from cream. Modern buttermilk, however, is produced by fermenting low-fat or skim milk with selected starter cultures and is widely consumed as a nutritious probiotic beverage.

History of Buttermilk

The origin of buttermilk dates back to ancient times when milk was stored at ambient temperatures. Natural fermentation occurred due to the presence of lactic acid bacteria. Traditionally, after butter was churned from fermented cream, the remaining watery liquid was called buttermilk. This traditional buttermilk was commonly consumed in rural communities for its cooling and digestive properties. With advancements in dairy technology, modern cultured buttermilk is now produced under hygienic and controlled conditions using defined starter cultures.

3. Types of Buttermilk

Traditional Buttermilk

By-product of butter making

Slightly acidic and watery

Contains minimal fat

Cultured (Modern) Buttermilk

  • Prepared from low-fat or skim milk
  • Fat content less than 2%
  • Also called cultured low-fat milk or cultured non-fat milk
  • Uniform texture and consistent flavour

Methodology / Preparation of Fermented Milk (Buttermilk)

Fresh, good-quality low-fat or skim milk is selected.

Milk is pasteurized by:

82–88°C for 30 minutes, or

90°C for 2–3 minutes

Purpose:

Destroys all naturally occurring microorganisms

Denatures milk proteins

Prevents wheying off (separation of liquid from solids)

Pasteurized milk is cooled to 22°C (72°F).

Starter cultures of desirable lactic acid bacteria are added.

Incubation for 12–14 hours (overnight)

Development of acidity and characteristic flavour

Breaking of Curd and Cooling

Curd is gently stirred

Product cooled to 7.2°C (45°F) to stop fermentation

Packaging and Storage

Hygienic packaging

Stored under refrigeration

 

5. Starter Cultures Used

Starter cultures are essential for the manufacture of fermented dairy products.

Common starter organisms:

  • Streptococcus lactis
  • Streptococcus cremoris
  • Leuconostoc citrovorum
  • Leuconostoc dextranicum

 

6. Role of Microorganisms in Buttermilk

Streptococcus lactis & Streptococcus cremoris

- Convert lactose into lactic acid

- Increase acidity

- Cause coagulation of milk proteins

- Improve shelf life

Leuconostoc species

- Produce diacetyl, responsible for buttery flavour

- Enhance aroma and taste

- Improve texture

Combined Action

  • Rapid acid production
  • Development of pleasant flavour
  • Uniform fermentation and product stability

 

Applications of Buttermilk

Nutritional Applications

  • Low fat and easily digestible
  • Rich in calcium, proteins, and vitamins
  • Suitable for lactose-intolerant individuals

Health Benefits

  • Improves digestion
  • Maintains healthy gut microflora
  • Acts as a natural probiotic drink

Culinary and Industrial Uses

  • Consumed as a refreshing beverage
  • Used in bakery and traditional foods
  • Base for other fermented dairy products

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