Mycobacterium Culture Medium with Alpha-Ketoglutarate
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Solution Overview
Problem
Current methods for detecting Mycobacterium species, such as M. tuberculosis, are slow and time-consuming due to the slow growth rate of these bacteria, often requiring several weeks for detection, which delays patient treatment and is hindered by overgrowth from faster-growing bacteria in culture media.
Innovation Solution
A novel culture medium formulation incorporating α-ketoglutarate as a nutrient supplement and an improved antimicrobial supplement, along with fatty acid-free bovine serum albumin and specific antimicrobial agents like fosfomycin, to enhance mycobacterial growth and inhibit contaminating organisms, reducing the time to detection by at least 2 days.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional culture media are used to detect Mycobacterium species, then the detection method is simple and requires standard laboratory equipment, but the time to detection is extended (several weeks) due to slow bacterial growth
Solution Approach 1:
The patent modifies the chemical composition parameters of the culture medium by incorporating α-ketoglutarate (5-50 g/L), fatty acid-free bovine serum albumin (0.1-10%), and specific antimicrobial agents (polymyxin B, amphotericin B, nalidixic acid, trimethoprim, fosfomycin) to optimize mycobacterial growth conditions and reduce detection time
Solution Approach 2:
The patent introduces α-ketoglutarate as a metabolic intermediary that serves as a carbon and energy source for mycobacteria, enhancing their growth rate and enabling faster detection while the antimicrobial agents act as intermediaries to suppress contaminating flora
2Reliability
If standard culture media are used, then the medium formulation is simple and easy to prepare, but faster-growing contaminating bacteria overgrow the slow-growing Mycobacterium species
Solution Approach 1:
The patent extracts and removes harmful factors by incorporating specific antimicrobial agents (polymyxin B against gram-negative bacteria, amphotericin B against fungi, nalidixic acid and trimethoprim against gram-positive bacteria, and fosfomycin as a broad-spectrum agent) that selectively suppress contaminating flora while preserving mycobacterial growth
Solution Approach 2:
The patent applies local quality by creating a selective environment where the culture medium supports mycobacterial growth through α-ketoglutarate and fatty acid-free BSA while simultaneously inhibiting contaminating organisms through strategically selected antimicrobial agents with specific spectra of activity
3Productivity
If conventional detection methods are used, then the methodology is straightforward and requires standard laboratory procedures, but the diagnostic process is time-consuming and delays patient treatment
Solution Approach 1:
The patent changes the nutritional and antimicrobial parameters of the culture medium to accelerate mycobacterial growth and enable faster detection, reducing the diagnostic timeline from several weeks to a significantly shorter period while maintaining diagnostic accuracy
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 culture medium significantly reduces the time to detect Mycobacterium growth, improving diagnostic efficiency and accuracy by accelerating the detection process while minimizing false positives and inhibiting contaminating flora.
Implementation Method 1
The culture medium may be supplemented with one or more substrates or intermediates of metabolic pathways, including, but not limited to, α-ketoglutarate, iso-citrate, L-malate, oxaloacetic acid, lactate and L-arginine
Implementation Method 2
The culture medium may further comprise one or more saturated or unsaturated long chain fatty acids, or salts thereof
Implementation Method 3
The culture medium may be supplemented with one or more antimicrobial agents or substances. Useful antimicrobial agents include, but are not limited to, polymyxin B, vancomycin, azlocillin, amphotericin B, nalidixic acid, trimethoprim and fosfomycin
Data Source
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Figure 1C
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AI summary
The present invention relates to an improved culture medium and method for the enhanced growth and detection of Mycobacterium growth. The invention further relates to an improved mycobacterial reagent system or kit that can be used for the enhanced growth and detection of Mycobacterium.