Rapid Mold Detection Using Cold-Water-Soluble Gel and Chromogenic Reagents
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Solution Overview
Problem
Current methods for detecting mold species like Aspergillus niger and Aspergillus carbonarius are slow, costly, and lack differentiation capabilities, particularly in the viticulture industry where rapid and cost-effective discrimination is needed to identify ochratoxin-producing fungi.
Innovation Solution
A method using a thin film culture device with a cold-water-soluble gelling agent, culture medium, and a hydrogen peroxide indicating reagent comprising horseradish peroxidase and chromogenic substrates to detect glucose oxidase-producing microorganisms within 24 to 48 hours, enabling differentiation and enumeration of Aspergillus species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional growth media methods (3M PETRIFILM, acidified potato dextrose agar) are used to detect mold species, then detection accuracy is maintained, but detection time increases to 3-7 days
Solution Approach 1:
The culture medium is pre-formulated with specific nutrients and selective agents (antibiotics, acidifiers) optimized for mold growth before the detection process begins. This preliminary preparation enables rapid colony development without requiring extended incubation periods, achieving detection in 24-48 hours while maintaining accuracy
Solution Approach 2:
The invention modifies critical parameters of the culture medium including pH levels (acidified conditions), nutrient composition, and antibiotic concentrations to create optimal growth conditions that accelerate mold colony development rate while preserving species-specific detection capabilities
2Loss of time
If advanced technologies (fluorescence microscopy, flow cytometry) are used to reduce detection time, then detection speed increases, but cost increases significantly
Solution Approach 1:
The invention employs disposable, pre-prepared culture medium packs containing all necessary nutrients, selective agents, and indicators in a single-use format. These inexpensive, single-use units eliminate the need for expensive, complex instrumentation while enabling rapid detection through simple incubation and visual reading
Solution Approach 2:
The culture medium system is designed to be self-contained and self-differentiating, where the medium itself provides selective pressure and visual indicators of mold growth and species identification without requiring expensive external analytical equipment or specialized operator expertise
3Ease of operation
If conventional culture methods are used without selective agents, then ease of operation is maintained, but ability to differentiate mold species is lost
Solution Approach 1:
The culture medium incorporates spatially distributed selective agents and pH indicators that create distinct local chemical environments. Different mold species respond differently to these localized conditions, producing characteristic growth patterns and color changes that enable differentiation while maintaining simple overall operation
Solution Approach 2:
The medium includes pH-sensitive indicators and chromogenic substrates that undergo visible color changes in response to species-specific metabolic activities. This provides automatic visual differentiation of mold species based on their biochemical characteristics, eliminating the need for complex microscopy or expert morphological analysis
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 allows for rapid and cost-effective detection and discrimination of Aspergillus species, including Aspergillus niger and Aspergillus carbonarius, within a shorter timeframe compared to traditional methods, facilitating quicker identification and reducing operational costs.
Implementation Method 1
providing a thin film culture device comprising a cold-water-soluble gelling agent
Implementation Method 2
a hydrogen peroxide indicating reagent comprising horseradish peroxidase and at least one chromogenic substrate
Implementation Method 3
detecting a reaction of the chromogenic substrate
Implementation Method 4
detecting microorganisms that produce glucose oxidase
Data Source
AI summary
Methods and kits are disclosed for detecting microorganisms that produce glucose oxidase. The method includes providing a culture medium and a hydrogen peroxide indicating reagent comprising a chromogenic substrate that can provide a detectable chromogenic reaction indicating the presence of a microorganism that produces glucose oxidase, and additional methods are disclosed for differentiating microorganisms by the detection of an additional chromogenic reaction.