client
Kefir Drink
Our Role
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Today’s Task
What We did Today?
Event: Clean Label Milk Beverage – Kefir Fermentation and Fortification
Today’s task involved the development of a probiotic-rich kefir beverage using a clean-label and fortification approach. Kefir is a traditional fermented drink produced by inoculating milk with a diverse culture of beneficial bacteria and yeasts. Though it provides a slightly sour flavor and creamy mouthfeel, it is an extremely popular beverage for its health benefits. The diverse microbial population of kefir (Lactobacilli, Lactococci, Leuconostoc spp., and yeasts) makes it a functional beverage that appeals most to modern-day consumers.
So, today we aim to formulate fortified kefir using natural ingredients and omitting synthetic stabilizers, flavors, or preservatives. We paid particular attention to high probiotic viability while developing the kefir and attempting to keep the final product aligned with clean label nutrition and regulatory requirements.
How I Felt Before Starting – Fermenting and Fortifying a Functional Milk Beverage
Formulating a naturally flavored, fortified, probiotic dairy beverage posed various challenges, including live culture viability, texture and taste stability, and a clean label approach. The additional challenge involves the fortification of fermented beverages with micronutrients like vitamin D by manipulating the timing and processing of the bioactivity and sensory profile. Regardless, I was thrilled that I could use evidence-based formulation techniques and food science to develop functional and consumer-friendly products.
🧪 What We Did Today
Our Product Development Plan – Fortified Kefir Beverage
We planned to develop kefir through three major phases:
- To create a standardized kefir base using pasteurized milk and a defined probiotic culture for controlled fermentation.
- To perform nutritional fortification and natural flavor enhancement while ensuring microbial viability and clean-label principles.
- To verify product quality and sensory performance through pH, acidity, texture, and flavor stability assessment.
Key Steps Followed Today:
The milk was collected, pasteurized, cooled, and standardized to ensure an optimum total solids content (TDS). This step is crucial for maintaining consistent fermentation/texture.
A direct vat inoculation (DVI) kefir culture was added to the pasteurized milk. The milk was incubated at a specific time/temperature for active fermentation. Once fermentation was complete, the kefir samples were sieved from the starter culture into a separate vessel.
The fermented beverage was fortified with various concentrations of vitamin D and incorporated with natural flavours. Extra precautions were taken to ensure that the live culture continued to be active and enhance sensory perception through this process.
A mild thermal stabilization was performed to ensure extended shelf-life and functionality of the product, while maintaining the live culture in its natural state. This was carefully monitored to limit probiotic viability losses or volatile flavour losses.
The product was bottled in an aseptic manner and refrigerated before quality assessment. Samples will be analysed for microbial stability, pH, ethanol content, organic acid, flavour retention, TDS, and overall product stability.
📚 What I Learned
- Impact of Fermentation Time: I have observed that the length of incubation period resulted in differences in thickness, acidity, and aroma.
- Flavor Stability and Instability: I have noticed that some flavors interacted and blended more positively with the kefir base because of their organic acid profile.
- Fortification Insight: I observed that adding vitamin D to kefir post-fermentation helped to preserve microbial activity, without affecting ethanol content and the balance of bacteria and yeast.
Outcome:
The fortified and flavored kefir exhibited solid probiotic activity, smooth mouth feel, and good taste. Some of the variants were better integrated than others; however, some will need further optimization to achieve consistency in quality and sensory activity.
✅ What Went Well
- The fermented kefir base was stable and yielded a desirable viscosity and acidity level.
- Natural flavors were mostly compatible and did not alter the microbial functioning of the product.
- The fortification and storage temperature did not alter the product’s sensory characteristics and microbial quality.
⚠️ What Could I Have Done Better
- Should have assessed the impact of adding vitamin D at various points during fermentation. Though fortifying post-fermentation kept microbial viability, evaluating the pre- and mid-fermentation addition could have provided better insights into metabolic activity and strain performance.
- I could have more accurately assessed the incubation endpoint by systemically recording the pH, titratable acidity, and redox potential of the fermentations, especially in balancing the production of both ethanol and organic acid.
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Project Code:24FRL-BEV-NPD 4577-01
Name:Mohammad Hassan
Project Code:24-FRL-FOD-NPD-2462-02
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Name: Harshad
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