Sporulation-Negative Bacillus Strains for Fermented Dairy Texture
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Solution Overview
Problem
The dairy industry faces challenges in improving the texture of fermented dairy products without using undesirable additives and in utilizing Bacillus strains due to their sporulation, which is undesirable in industrial production.
Innovation Solution
The method involves fermenting a milk substrate with a lactic acid bacterium starter culture in the presence of sporulation-negative Bacillus subtilis subsp. natto or Bacillus coagulans strains, which do not form spores, thereby enhancing the texture of both thermophilic and mesophilic dairy products by increasing shear stress and gel stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Bacillus strains are used for fermentation to improve texture, then texturizing characteristics are enhanced, but spore formation occurs which is undesirable in industrial production
Solution Approach 1:
The patent extracts and eliminates the spore-forming capability from the Bacillus strain through genetic modification, creating a sporulation-negative mutant that retains texturizing properties without the harmful spore formation. This directly resolves the contradiction by removing the unwanted characteristic while preserving the beneficial one.
Solution Approach 2:
The patent changes the physiological parameter of the Bacillus strain by inducing mutations that prevent sporulation. The sporulation-negative mutant exhibits altered spore formation parameters (complete suppression) while maintaining or enhancing polysaccharide production capabilities, thus improving texture without spore contamination.
2Strength
If additives are added to improve texture, then texturizing characteristics are enhanced, but consumer acceptance decreases due to desire for clean label products
Solution Approach 1:
The patent enables the fermentation system to produce its own texturizing agents through the Bacillus strain's endogenous polysaccharide production capability. The sporulation-negative mutant naturally synthesizes exopolysaccharides during fermentation, eliminating the need for external additives and satisfying clean label requirements while achieving desired texture.
Solution Approach 2:
The patent changes the functional parameters of the fermentation process by introducing a Bacillus strain with enhanced or modified polysaccharide production capabilities. This biological parameter change replaces chemical additives with biologically-produced texturizing agents, resolving the contradiction between texture improvement and consumer acceptance.
3Strength
If genetically modified LAB strains with increased galactokinase activity are used, then texture is improved, but consumer preference for naturally occurring strains decreases
Solution Approach 1:
The patent employs a Bacillus strain that serves multiple functions: it produces texturizing polysaccharides, tolerates the low pH environment during fermentation, and can be positioned as a natural culture addition rather than a genetically modified organism. This multi-functionality allows achieving texture improvement while maintaining consumer acceptance through the use of what is perceived as a natural culture.
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
This approach significantly improves the texture of dairy products, with shear stress and gel stiffness increased by up to fourfold, and reduces acidification time, making the production process more efficient and cost-effective.
Implementation Method 1
LAB produce high amounts of lactic acid during fermentation which results in a considerable reduction of the pH to 4-5 during fermentation
Implementation Method 2
a sporulation-negative strain is a strain, which forms no spores when subjected to the following method
Implementation Method 3
The ability of the strains used for fermentation to confer texture to dairy products is to some extent linked to the production of polysaccharides
Data Source
AI summary
The invention relates to a method for producing a fermented dairy product, comprising: (a) providing a milk substrate, (b) fermenting said milk substrate with a lactic acid bacterium starter culture, wherein step (b) is conducted in the presence of at least one Bacillus strain selected from the group consisting of a sporulation-negative Bacillus subtilis subsp. natto strain, a sporulation-negative Bacillus coagulans strain, wherein a sporulation-negative strain is a strain, which forms no spores when subjected to the following method: i) inoculating 1% of a culture of the strain to be tested, grown over night in Veal Infusion Broth (VIB) at 37° C., 180 rpm, into 50 ml of a standard sporulation inducing medium contained in a 500 ml baffled shake flask, ii) allowing the inoculated medium to grow overnight at 37° C. while subjecting it to shaking at 0rpm, and iii) testing for spores the next day.