Ion Guide Transient DC Voltage for Ion-Ion Reaction Efficiency
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Solution Overview
Problem
Current methods for performing Electron Transfer Dissociation (ETD) and Proton Transfer Reaction (PTR) face challenges in optimizing ion-ion reactions and charge state reduction, particularly due to limitations in confining ions with different mass-to-charge ratios and kinetic energy mismatches, which affect the efficiency of these processes in mainstream mass spectrometers.
Innovation Solution
An ion guide with a plurality of electrodes applies transient DC voltages to drive ions along its axial length, allowing for controlled interaction between analyte and reagent ions, and varying the amplitude and rate of these voltages to optimize ion-ion reactions and reduce charge states, enabling efficient ETD and PTR processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transient DC voltages are applied to drive ions along the axial length of the ion guide, then ion-ion reaction efficiency is improved, but device complexity increases due to the need for precise voltage control and electrode configuration
Solution Approach 1:
The patent applies transient DC voltages that are dynamically adjusted in amplitude and rate to optimize ion-ion reactions. The voltages are not static but are modulated to match kinetic energies of ions and enhance reaction efficiency at different stages of the process, embodying the dynamics principle of making the system adaptable and changeable.
Solution Approach 2:
The patent systematically varies key parameters including voltage amplitude, voltage application rate, ion guide pressure, and ion density to optimize the ion-ion reaction process. By changing these parameters, the system achieves enhanced reaction efficiency while managing the complexity through controlled parameter optimization.
2Productivity
If kinetic energies of ions are matched to optimize reactions, then reaction efficiency is improved, but the range of applicable ion types is reduced due to specific energy requirements
Solution Approach 1:
The system dynamically adjusts voltage parameters to match the kinetic energies of different ion types. By making the voltage application rate and amplitude adaptive rather than fixed, the system can optimize reactions for various ion species while maintaining high efficiency, thus resolving the contradiction between efficiency and versatility.
Solution Approach 2:
The patent employs parameter changes by adjusting voltage amplitude and application rate based on the specific ion types being analyzed. This allows the system to adapt to different ion species while maintaining optimized reaction conditions, effectively balancing efficiency and adaptability through systematic parameter optimization.
3Measurement precision
If charge state reduction is optimized through Proton Transfer Reaction, then analyte characterization is improved, but reaction time increases due to the sequential nature of charge reduction
Solution Approach 1:
The patent applies transient DC voltages continuously during the Proton Transfer Reaction process to maintain optimal reaction conditions throughout. This continuous application of controlled voltages ensures that charge state reduction proceeds efficiently without interruption, reducing overall reaction time while maintaining high measurement precision through sustained optimized conditions.
Solution Approach 2:
The system employs periodic modulation of DC voltages during the charge reduction process, applying voltages in optimized cycles that enhance proton transfer efficiency. This periodic action allows for more rapid charge state reduction compared to continuous static conditions, thereby reducing reaction time while maintaining analytical precision.
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 enhances the efficiency of ion-ion reactions and charge state reduction by matching kinetic energies and optimizing reaction conditions, making ETD and PTR more effective on commercial mass spectrometers without the need for expensive FT-ICR instruments.
Implementation Method 1
A first device is arranged and adapted to apply one or more first transient DC voltages or potentials... to drive or urge at least some first ions along and/or through at least a portion of the axial length of the ion guide
Implementation Method 2
transient DC voltages or potentials... in order to drive or urge at least some first ions along and/or through at least a portion of the axial length of the ion guide in a first direction
Implementation Method 3
The process of reacting positively charged analyte ions with negatively charged reagent ions has been referred to as Electron Transfer Dissociation ('ETD'). Electron Transfer Dissociation is a mechanism wherein electrons are transferred from negatively charged reagent ions to positively charged analyte ions
Implementation Method 4
The cations and anions are simultaneously trapped within the 2D linear ion trap by applying an auxiliary axially confining RF pseudo-potential barrier at both ends of the 2D linear quadrupole ion trap
Implementation Method 5
Analyte ions may be fragmented either by ion-ion reactions or by ion-neutral gas reactions. Analyte ions and/or fragment ions may also be charge reduced by Proton Transfer Reaction
Data Source
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AI summary
An ion-ion reaction cell is provided comprising a plurality of electrodes (1) forming an ion guide ()2. A transient DC voltage wave is applied to the electrodes (2) in order to load reagent anions into the ion guide (2). Analyte cations are then subsequently transmitted through the ion-ion reaction cell by a subsequent transient DC voltage wave. Ion are arranged to undergo ion-ion reactions within the reaction cell and the resulting fragment ions which are formed within the reaction cell are then subsequently translated out of the reaction cell by means of a transient DC voltage wave.