Metabolite Quantification via Derivatization and Mass Spectrometry
Solution Overview
Problem
Current methods for quantifying metabolites in cell cultures are not robust or high-throughput enough to effectively monitor and optimize fed-batch cultures, leading to issues with growth inhibition and productivity due to the accumulation of toxic metabolic waste products like lactate and ammonia, as well as other inhibitory metabolites.
Innovation Solution
A method involving the addition of a stable isotope labelled internal standard, derivatization with a reagent containing a carbonyl reactive group and a masking group, followed by chromatographic separation and full scan accurate mass high resolution mass spectrometry to quantify metabolites, allowing for both absolute and relative quantification and monitoring of metabolite levels over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metabolite quantification methods are used, then the analysis can be performed with simple equipment, but the method lacks robustness and high-throughput capability to effectively monitor and optimize fed-batch cultures
Solution Approach 1:
The patent employs comprehensive derivatization reactions that modify multiple metabolite parameters simultaneously, converting them into forms suitable for high-resolution mass spectrometry detection. This enables rapid quantification of numerous metabolites in parallel, achieving high-throughput capability while maintaining method robustness for monitoring fed-batch cultures
Solution Approach 2:
The patent introduces stable isotope-labeled internal standards as intermediary substances to facilitate accurate quantification. These intermediaries co-elute with target metabolites and provide reference signals for mass spectrometry, enabling robust and reproducible high-throughput metabolite analysis even in complex culture media
2Measurement precision
If comprehensive metabolite analysis is performed to identify all inhibitory metabolites, then the monitoring capability is improved, but the analysis time and resource requirements increase
Solution Approach 1:
The patent segments the metabolite analysis into distinct categories based on derivatization behavior and mass spectrometry detection characteristics. By grouping metabolites with similar properties and using targeted derivatization strategies, the method achieves comprehensive coverage of inhibitory metabolites while reducing overall analysis time through efficient parallel processing
Solution Approach 2:
The patent performs preliminary derivatization of all metabolites before analysis, converting them into volatile, thermally stable forms that can be rapidly analyzed by gas chromatography-mass spectrometry. This preliminary chemical transformation enables simultaneous detection of multiple metabolite classes without requiring sequential analysis methods, thereby reducing total analysis time while maintaining detection 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
Enables rapid and reliable determination of metabolite levels, enabling timely adjustments to cell culture conditions, thereby improving productivity and product quality by effectively managing inhibitory metabolites and optimizing cell culture conditions.
Implementation Method 1
contacting the sample with a reagent comprising a carbonyl reactive group and a masking group, thereby derivatising the carbonyl group of each metabolite with the masking group
Implementation Method 2
subjecting the derivatised sample to chromatographic separation
Implementation Method 3
full scan accurate mass high resolution mass spectrometry to quantify metabolites
Data Source
AI summary
Provided herein are methods for quantifying the concentration of multiple metabolites in a sample. Also provided are methods for relative quantification of multiple metabolites in a sample, methods for monitoring the course of a cell culture, and methods for optimising a cell culture.