Testing the Viability of Probiotic Microorganisms in Different Dairy Products-

Live microorganisms that, when given in sufficient quantities, provide health advantages are known as probiotics. Because milk components including lactose, proteins, and fat provide a suitable environment, they are frequently added to dairy products. But it's still quite difficult to keep them viable during manufacturing, storage, and gastrointestinal transit.

Because they offer nutrients and buffering capacity that improve bacterial survival, dairy products like yogurt, kefir, and fermented milk are thought to be ideal probiotic carriers. Dairy matrices can greatly shield probiotic microorganisms, particularly during digestion and storage, according to studies. At the time of intake, a minimum therapeutic level of 10–10 CFU/g is often need.

2. Objectives-      

To assess probiotic bacteria' survival in various dairy products

Comparing the rates of survival during storage

To investigate how physicochemical characteristics affect the stability of probiotics

3. MATERIALS AND METHODS-  

3.1 Materials- 

 Lactobacillus acidophilus, Lactobacillus casei, and Bifidobacterium animalis are probiotic microorganisms.

Dairy items include ice cream, yogurt, fermented milk, and milk.

Media for culture: MRS agar

3.2 Sample Preparation-

Standardized probiotic bacteria were added to each dairy product, and it was then incubated under ideal circumstances.

3.3 Storage Requirements -

Samples were examined at intervals of 0, 7, 14, 21, and 28 days while being kept at 4°C.

3.4 Testing for Viability-

Method of serial dilution-

Method of plate counting (CFU/mL or CFU/g)

3.5  Physicochemicals Analysis-

pH measurement

Acidity that is titratable

Sensory assessment

4. RESULT AND DIACUSSION-

4.1 Different Dairy Products' Viability-

Because of the acidic environment and the presence of starter cultures, yogurt and fermented milk have the highest survival rates.

Milk: Moderate survivability; protection is limited by absence of fermentation

Ice cream: Stress from chilling reduces survival

Compared to ice cream and pills, fermented milk offers superior probiotic survival, according to research.

4.2 Effect of storage Time-

During storage, viability steadily declines.

Certain strains, such as L. acidophilus, exhibit more stability than others.

Microbial decrease is slowed but not stopped by refrigeration.

Research indicates that when yogurt is refrigerated, probiotic counts can stay above therapeutic levels (10? CFU/g) for up to 28 days.

4.3 Effect of pH and Acidity-  

Probiotic viability is decreased by lower pH.

Survival is adversely affected by excessive acid generation during storage.

Acidity balance is essential.

4.4  Effect of Dairy Matrix-

Bacterial survival is enhanced by fat and protein content.

Fermented goods offer a microclimate that is protective.

Fruit or prebiotics improve viability.

For instance, compared to plain yogurt, fruit yogurt had more probiotic survival.

4.5  Strain- Specefic Behavior-

The survival rates of different strains vary; L. acidophilus is typically more stable than L. casei or L. reuteri.

Growth and survival are impacted by interactions with starting cultures

CONCLUSION

The kind of dairy product, storage conditions, and bacterial strain all have a major impact on the survivability of probiotic microorganisms. The best conditions for preserving probiotic viability are found in fermented dairy products like yogurt and fermented milk. For the user to receive enough live cells for therapeutic advantages, proper formulation and storage are crucial.

FUTURE SCOPE

The development of techniques for microencapsulation

Use of synbiotics (prebiotics and probiotics)

Examination of non-dairy probiotic carriers.

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