Solid Luciferase Agar Medium for Rapid Cell Viability Detection
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Solution Overview
Problem
Conventional methods for assessing cell viability and antibiotic susceptibility testing are time-consuming, require multiple steps, and can be difficult to reproduce, limiting their efficiency and reliability.
Innovation Solution
A solid composition comprising luciferase, D-luciferin, nutrients, and agar is used to prepare a solid agar growth medium, which can be mixed with an aqueous solution for the detection of ATP from cell cultures, facilitating real-time monitoring of cell viability and antibiotic susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cell viability assessment methods are used, then measurement accuracy is achieved, but test time is excessive and procedure complexity increases
Solution Approach 1:
The invention combines cell culture medium and luciferase detection reagents into a single integrated solid composition. The medium contains both nutrients for cell growth and luciferase substrate for ATP detection, eliminating the need for separate medium preparation and separate addition of detection reagents. This merging of functions directly reduces test time while maintaining detection accuracy.
Solution Approach 2:
The luciferase and D-luciferin are pre-incorporated into the solid culture medium before cells are added. This preliminary preparation ensures that the detection system is ready immediately when cells are introduced, eliminating delays associated with adding reagents after cell culture establishment. The medium is prepared in advance with all necessary components for both growth and detection.
2Measurement precision
If conventional ATP detection methods are used, then detection sensitivity is achieved, but procedure complexity increases due to multiple steps including cell lysis
Solution Approach 1:
The invention extracts and eliminates the cell lysis step from the conventional ATP detection procedure. By using a solid medium containing luciferase and substrate that works directly with intact cells, the complex lysis procedure is removed while maintaining ATP detection sensitivity. This simplifies the assay to a single-step process where cells are simply added to the pre-prepared solid medium.
Solution Approach 2:
The solid medium formulation allows cells to contribute their own ATP for detection without requiring external lysis treatment. The luciferase system in the medium directly detects ATP released from viable cells during normal metabolic activity, eliminating the need for manual lysis intervention while maintaining detection sensitivity.
3Measurement precision
If conventional cell lysis methods are used, then ATP release is achieved, but reproducibility decreases
Solution Approach 1:
Viable cells naturally release ATP through their metabolic processes when grown in the luciferase-containing medium. This self-service mechanism eliminates the need for standardized lysis procedures, which are a major source of variability. Each cell population releases ATP according to its own metabolic rate, providing a more reliable and reproducible measure of cell viability that reflects biological reality rather than mechanical processing variability.
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 method allows for the rapid and efficient assessment of cell viability and antibiotic susceptibility by simplifying the assay process, reducing test time, and eliminating the need for cell lysis, thereby improving reproducibility and cost-effectiveness.
Implementation Method 1
Luciferases are a class of oxidative enzymes, which are able to generate bioluminescent light by means of a chemical reaction with oxygen and a substrate. The most commonly used luciferases are the firefly luciferases. Firefly luciferase catalyzes a two-step oxidation reaction of its specific substrate, D-luciferin, in the presence of Mg2+
Implementation Method 2
Luciferin-luciferase bioluminescence is a highly sensitive detection method used for numerous clinical, diagnostic and research applications
Data Source
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AI summary
The present invention relates to a method for assessing cell viability of bacterial and fungal cells and to a method for the detection of bacterial and fungal cells with specific enzyme activities. The methods of the present invention rely on the real-time measurement of the level of luminescence signal from a luciferase enzyme directly from a growing culture of bacterial or fungal cells. Furthermore, the present invention relates to a method for assessing susceptibility of bacterial cells to antibiotics by measuring ATP levels using a luciferase assay system.