Glutamine Biosensor Medium for Nitrogen Quantification
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Solution Overview
Problem
Current methods for detecting glutamine in plants and soils are indirect, expensive, time-consuming, and require technical expertise, limiting the ability to efficiently quantify nitrogen status and nitrogen fixation.
Innovation Solution
A glutamine biosensor medium comprising a glutamine auxotrophic E. coli strain, such as GlnLux, that expresses a reporter gene like lux, is used to detect glutamine levels in plants, soils, or microbes, providing a simple, inexpensive, and high-throughput method for identifying nitrogen fixation and nitrogen content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HPLC-based analysis is used to quantify glutamine, then measurement precision is improved, but loss of time and productivity deteriorate
Solution Approach 1:
The patent replaces the mechanical HPLC system with a biological sensing system using glutamine auxotrophic bacteria. These bacteria naturally respond to glutamine presence through metabolic pathways, eliminating the need for complex mechanical chromatography equipment and significantly reducing analysis time while maintaining detection capability.
Solution Approach 2:
The glutamine auxotrophic bacteria perform the detection function autonomously through their natural metabolic response to glutamine. The bacteria's growth or metabolic activity directly indicates glutamine presence and concentration, eliminating the need for operator intervention in sample preparation, separation, and detection steps required by HPLC.
2Measurement precision
If HPLC-based analysis is used to quantify glutamine, then measurement precision is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The complex HPLC mechanical system is replaced with a simple biological assay using glutamine auxotrophic bacteria. The detection relies on natural bacterial metabolic responses rather than complex separation mechanics, dramatically simplifying the device while preserving measurement capability.
Solution Approach 2:
The patent changes the detection parameter from physical-chemical separation (HPLC retention time) to biological response (bacterial growth or metabolic activity). This parameter change simplifies the detection system by utilizing natural biological processes instead of complex mechanical separation.
3Measurement precision
If conventional glutamine detection methods are used, then measurement precision is improved, but ease of operation and productivity deteriorate
Solution Approach 1:
The patent replaces conventional complex detection methods with a simple bacterial assay that can be performed using basic microbiology techniques. This substitution makes the operation accessible to personnel with minimal training while maintaining detection accuracy through the bacteria's specific metabolic response to glutamine.
Solution Approach 2:
The glutamine auxotrophic bacteria autonomously perform the detection function through their natural metabolic response to glutamine. The bacteria's growth or metabolic activity directly indicates glutamine presence and concentration, eliminating the need for operator intervention in sample preparation, separation, and detection steps required by HPLC.
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 biosensor medium allows for rapid, accurate, and cost-effective detection of glutamine, enabling improved crop production, efficient nitrogen fertilizer management, and reduced dependence on nitrogen fertilizers by quantifying nitrogen levels in plants and soils.
Implementation Method 1
A glutamine biosensor medium comprising a glutamine auxotrophic E. coli strain, such as GlnLux, that expresses a reporter gene like lux
Data Source
AI summary
An essentially glutamine-free medium comprising a whole-cell glutamine biosensor, comprising a glutamine auxotrophic E. coli and a Lux reporter gene, for detecting glutamine in an analyte. The medium is useful in methods to detecting, screening, identifying and selecting nitrogen-fixing microbes and in methods of determining the nitrogen state of plants, plant products and soil.