Osmotolerant Yeast Detection Medium
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Solution Overview
Problem
Current methods for detecting osmotolerant yeasts in food products with low water activity are not sufficiently selective and require extended incubation times, leading to delayed detection of spoilage and increased costs due to unreliable gas formation detection and verification issues.
Innovation Solution
A nutrient medium comprising specific compositions of glucose, fructose, yeast extract, malt extract, glycerol, and other components that optimize fermentation metabolism, allowing for accelerated and sensitive identification of osmotolerant yeasts, with an adjusted water activity level between 0.86 and 0.95, enabling quicker detection of gas formation and spoilage potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard yeast culture media (YGC, YPD, TGYC) are used with high water activity (>0.95), then general yeast growth is supported, but osmotolerant yeasts are not specifically detected and selectivity is lost
Solution Approach 1:
The patent changes the water activity parameter from >0.95 in standard media to 0.88-0.92 in the new medium by adjusting glucose (15-30%), glycerol (5-15%), and salt concentrations. This parameter change creates selective pressure that allows osmotolerant yeasts to grow while inhibiting non-osmotolerant organisms, thereby achieving specific detection of osmotolerant strains without sacrificing detection reliability
2Adaptability or versatility
If selective media with lower water activity (0.88-0.92) are used to detect osmotolerant yeasts, then detection selectivity is improved, but incubation times increase to 21 days
Solution Approach 1:
The patent performs preliminary enrichment cultivation in the selective medium (0.88-0.92 water activity) before final detection. This preliminary action allows osmotolerant yeasts to adapt and multiply in the selective environment, reducing the subsequent incubation time needed for detection from 21 days to just 3-7 days while maintaining the selectivity benefits of the lower water activity medium
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: water activity (0.88-0.92), glucose concentration (15-30%), glycerol (5-15%), and adds specific nutrients (yeast extract 0.2-0.8%, peptone 0.2-0.8%, thiamine 0.00003-0.0002%). These coordinated parameter changes create optimal conditions for osmotolerant yeast growth that reduce incubation time while preserving selectivity
3Reliability
If existing culture media are used, then basic yeast cultivation is possible, but fermentation metabolism is not optimized and gas formation detection is unreliable
Solution Approach 1:
The patent changes the chemical composition parameters by adding specific fermentation substrates (glucose 15-30%, fructose 0.7-2.0%) and cofactors (thiamine 0.00003-0.0002%, ammonium salts). These parameter changes optimize the medium for fermentation metabolism, enabling reliable gas formation detection within 3-7 days and significantly improving both detection reliability and productivity compared to conventional media
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 nutrient medium enables faster and more reliable detection of osmotolerant yeasts, reducing detection times to 3-7 days and enhancing the sensitivity of identifying spoilage potential, thereby minimizing financial losses and improving product quality control.
Implementation Method 1
an accelerated and increased fermentation activity and CO2 transfer rate can be detected for all species of osmotolerant yeasts examined in a nutrient medium containing the composition according to the invention described here
Data Source
Figure 1A~1B
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AI summary
The invention relates to a nutrient medium for cultivating osmotolerant microorganisms and the use thereof. The invention further relates to a method for isolating and/or enhancing the growth of osmotolerant microorganisms. The invention also relates to a kit for analyzing osmotolerant microorganisms.