Beta-Galactosidase Stability Across pH and Heat in Dairy Processing
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Solution Overview
Problem
Existing lactases are not suitable for lactose hydrolysis in dairy products at high temperatures or during pH changes, limiting their use in processes like ultra-heat treated milk production and requiring separate enzyme treatments, which are costly and inefficient.
Innovation Solution
Development of beta-galactosidases with enhanced stability and activity at a broad range of temperatures and pH values, allowing their use in lactose hydrolysis before pasteurization or UHT treatment, and enabling production of lactose-free or low-lactose products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional neutral lactases are used in dairy products, then they can hydrolyze lactose at neutral pH, but they lose activity when pH decreases during fermentation or when high temperature is applied
Solution Approach 1:
The patent applies parameter changes by modifying the enzyme's operational parameters - specifically achieving activity at low pH (3.0-6.0) and high temperature (40-70°C) through protein engineering or selection of extremophile sources, fundamentally changing the pH-temperature stability profile from conventional neutral lactases
2Productivity
If separate enzyme treatment steps are used before fermentation, then lactose can be reduced, but the process becomes more complex and costly
Solution Approach 1:
The patent merges the lactose hydrolysis function with the fermentation process by using acid-stable lactases that remain active at low pH, allowing simultaneous lactose reduction and fermentation in a single step rather than requiring separate pretreatment and fermentation stages
Solution Approach 2:
The acid-stable lactase enzyme serves multiple functions: it hydrolyzes lactose effectively at neutral pH before fermentation and continues to function at low pH during fermentation, making it a universal enzyme for both stages of the process
3Productivity
If high enzyme dosages are used to maintain activity at low pH, then lactose hydrolysis can be achieved, but the cost increases
Solution Approach 1:
The patent changes the enzyme's pH stability parameter to remain active at low pH conditions, eliminating the need for high dosages that would be required by conventional enzymes to compensate for their rapid deactivation in acidic environments
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 new beta-galactosidases maintain high activity under conditions not typically suitable for conventional enzymes, facilitating efficient lactose reduction in dairy products and enabling their use in various applications, including UHT milk and fermented products.
Implementation Method 1
Lactase (beta-galactosidase; EC 3.2.1.23) is the enzyme that performs the hydrolysis step of the milk sugar lactose into monosaccharides
Implementation Method 2
the enzyme that performs the hydrolysis step of the milk sugar lactose into monosaccharides
Data Source
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AI summary
The present invention relates to new improved peptide or dimeric peptides exhibiting betagalactosidase enzyme activity as well as improved methods for reducing the lactose content in compositions, such as dairy products.