Lactase Enzyme Dynamics for Fermented Milk Taste Stability
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Solution Overview
Problem
Fermented milk products like yogurt often experience flavor changes, particularly sourness, due to disruptions in cold chains or the addition of live bacteria after pasteurization, leading to inconsistent taste profiles and consumer dissatisfaction.
Innovation Solution
A method involving the use of a low concentration of lactase, specifically less than 200 g/ton of milk-based substrate, added at the start, during, or after the fermentation step, to slowly and continuously hydrolyze lactose over the shelf life of fermented milk products, thereby maintaining a consistent taste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high concentration of lactase is added to hydrolyze lactose quickly, then lactose is rapidly converted to glucose and galactose, but the product develops excessive sweetness too early and loses the characteristic yogurt flavor profile
Solution Approach 1:
The patent applies dynamics by using a low concentration of lactase that allows the enzyme activity to dynamically adapt to changing pH conditions during storage. As the yogurt pH naturally increases over time, the lactase gradually becomes more active, creating a dynamic hydrolysis process that matches the product's aging profile rather than operating at constant high rate
Solution Approach 2:
The invention exploits parameter changes by leveraging the pH-dependent activity of lactase. The low concentration of enzyme combined with pH changes during storage and transport creates optimal hydrolysis conditions at different time points, transforming the static enzyme concentration into a functionally variable system that maintains taste consistency
2Reliability
If the cold chain is disrupted during storage, then lactic acid bacteria continue to produce lactic acid, but the product becomes excessively sour and develops inconsistent flavor
Solution Approach 1:
The patent converts the harmful effect of cold chain disruption into a benefit by utilizing the pH increase that occurs during warm storage. This pH increase naturally activates the low-concentration lactase, turning the harmful condition (temperature abuse) into a beneficial effect (enhanced lactose hydrolysis that counteracts excessive sourness)
Solution Approach 2:
The invention introduces lactase as an intermediary substance that mediates between the harmful lactic acid production and the desired taste profile. The enzyme acts as a chemical mediator that continuously converts lactose to sweeter sugars, balancing the sourness generated by cold chain disruptions
3Quantity of substance
If live bacteria are added after pasteurization to extend shelf life, then probiotic content is enhanced, but the product becomes more acidic and sour over time
Solution Approach 1:
The patent applies continuity of useful action by maintaining low-level lactase activity throughout the entire shelf life of the product. This continuous, low-intensity hydrolysis of lactose provides a steady supply of sweeter sugars that continuously counteract the acidification caused by probiotic bacteria, rather than applying a single high-dose treatment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively maintains a constant taste profile of fermented milk products over their shelf life, even under conditions of temperature instability or post-pasteurization supplementation with live bacteria, by gradually increasing sweetness and reducing sourness.
Implementation Method 1
lactase... slowly and continuously hydrolyzed over the shelf life of the fermented milk product... glucose and galactose are sweeter than lactose
Data Source
AI summary
The present invention is in the field of dairy technology. It relates to methods for producing fermented milk products such that the sourness of said product is prevented during its shelf life.