Mass Spectrometry Reaction Chamber Heating for Stable Radical Dissociation
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Solution Overview
Problem
The temperature change in the reaction chamber during radical supply in mass spectrometry methods leads to a decrease in kinetic energy of precursor ions, reducing the generation efficiency of desired product ions, as unreacted material gas with a lower temperature is introduced along with radicals, causing unintended dissociation at positions other than intended functional groups.
Innovation Solution
A method and apparatus where electric power corresponding to the radical generation condition is supplied to a temperature control part in the reaction chamber, using a heater or both heating and cooling elements, to maintain optimal temperature, ensuring precursor ions react efficiently with radicals, thereby stabilizing the reaction chamber temperature and enhancing product ion generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If material gas is introduced into the radical generation chamber to generate radicals, then radicals are successfully generated and introduced into the reaction chamber, but the unreacted material gas with lower temperature cools the reaction chamber, decreasing the kinetic energy of precursor ions and reducing product ion generation efficiency
Solution Approach 1:
The reaction chamber is pre-heated to a higher temperature before introducing the material gas and radicals. This preliminary heating action ensures that even when the cold material gas is introduced, the reaction chamber maintains sufficient temperature to preserve precursor ion kinetic energy and product ion generation efficiency
Solution Approach 2:
The cooling effect of the introduced material gas is counteracted in advance by heating the reaction chamber to a higher temperature. This preliminary anti-action compensates for the expected temperature drop, maintaining the thermal conditions necessary for efficient radical-precursor ion reactions
2Productivity
If the reaction chamber is heated to maintain temperature during radical supply, then precursor ion kinetic energy is preserved and product ion generation efficiency is improved, but energy consumption increases
Solution Approach 1:
The temperature parameter of the reaction chamber is dynamically adjusted based on the radical generation conditions. By changing the heating power level according to the specific material gas flow rate and radical generation requirements, the system optimizes energy consumption while maintaining sufficient temperature for efficient reactions
3Object-affected harmful factors
If the reaction chamber temperature is reduced by introducing cold material gas, then contamination by sample component attachment is inhibited, but precursor ion kinetic energy decreases leading to unintended dissociation at positions other than intended functional groups
Solution Approach 1:
The reaction chamber temperature is maintained at an optimal level by adjusting heating power in response to material gas introduction. This parameter control ensures that the temperature remains high enough to preserve precursor ion kinetic energy for specific dissociation, while the continuous flow of material gas still provides contamination inhibition benefits
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 reduces temperature fluctuations in the reaction chamber, maintaining the kinetic energy of precursor ions and improving the generation efficiency of desired product ions by compensating for temperature changes caused by the introduction of material gas, ensuring precise and efficient radical attachment reactions.
Implementation Method 1
an amount of electric power corresponding to a generation condition of the radical is supplied to a temperature control part provided in the reaction chamber
Implementation Method 2
radicals generated by introducing a material gas into a radical generation chamber to generate plasma of the material gas
Implementation Method 3
a hydrogen gas is introduced into a tungsten capillary heated to a high temperature of 2000° C. and thermally decomposed to generate hydrogen radicals
Implementation Method 4
a radical attachment dissociation method has been proposed in which radicals are attached to precursor ions derived from a sample component such as a protein or a peptide to dissociate the precursor ions at the position of specific functional groups
Data Source
AI summary
A method for performing mass spectrometry by causing a precursor ion derived from a sample component and a radical to react in a reaction chamber 132 to generate products ion from the precursor ion, the method including: a step 6 of generating a radical from a material gas; a step 8 of introducing the radical and the precursor ion into the reaction chamber 132 in a state where an amount of electric power corresponding to a generation condition of the radical is supplied to a temperature control part 1331 provided in the reaction chamber 132; and a step 9 of separating and detecting product ions generated from the precursor ion in the reaction chamber 132 according to a mass-to-charge ratio.