Sequential Charge Detection Mass Analysis for >1 MDa Ions
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Solution Overview
Problem
Current mass spectrometry instruments struggle to accurately measure large biomolecules and particles in the range of 10's to 100's of MDa due to limited dynamic range and heterogeneity, with existing charge detection mass spectrometry systems being inadequate for analytes larger than 1 MDa.
Innovation Solution
A sequential pass express charge (SPEeD) mass analyzer that utilizes efficient upstream optics for thermalization and ion acceleration, combined with a unique data analysis methodology, enabling high-throughput and sensitive mass measurements of ions up to 10,000 per second by kinematically compressing ion energies and using interweaved detector electrodes for precise mass determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass spectrometry instruments are used to measure large biomolecules, then measurement capability is limited to smaller analytes, but dynamic range and heterogeneity cause measurement failures for analytes in the range of 10's to 100's of MDa
Solution Approach 1:
The patent changes the fundamental measurement parameters by using charge detection instead of traditional mass-to-charge ratio measurement. By detecting the charge state of individual ions and combining it with time-of-flight information, the system achieves accurate mass measurements for extremely large analytes (10's to 100's of MDa) that are beyond the capability of conventional MS instruments. This parameter change enables the system to handle the full dynamic range from small to extremely large biomolecules.
2Productivity
If single pass charge detection mass spectrometry is used, then measurement speed is limited, but throughput remains insufficient for high-speed analysis
Solution Approach 1:
The patent implements continuous ion detection by maintaining a steady stream of ions passing through the time-of-flight tube with continuous detection. The system processes ions continuously rather than in discrete batches, achieving throughput exceeding 10,000 ions per second. This continuous operation eliminates idle time between measurements and maximizes the productive use of the detection system.
3Measurement precision
If measurements are made for MDa-sized analytes, then mass measurement accuracy can be achieved, but dynamic range suffers due to increased heterogeneity and broadened peaks
Solution Approach 1:
The patent segments the measurement process into distinct components: time-of-flight measurement for velocity determination, charge detection for charge state identification, and computational combination of these parameters for mass calculation. This segmentation allows each measurement component to be optimized independently, maintaining high precision for individual measurements while simultaneously handling a broad dynamic range through the flexible combination of parameters.
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 accurate mass measurements of ions greater than 1 MDa at rates exceeding 10,000 ions per second, overcoming measurement errors and achieving sufficient resolution for heterogeneous samples, allowing rapid quantification of pathogen content in aerosols and other macromolecular complexes.
Implementation Method 1
an ion accelerator stage downstream of the inlet, the ion accelerator stage configured for kinematic compression of the ionized analytes
Implementation Method 2
a SPEeD mass analyzer stage downstream of the ion accelerator stage, the SPEeD mass analyzer stage configured for high-speed characterization of the ionized analytes
Data Source
AI summary
A sequential pass express charge (e) detection (SPEeD) mass analyzer designed for highly sensitive, rapid mass measurements of high mass (>1 MDa) analytes. A SPEeD analyzer enables high throughput and sensitivity because ions merely need to pass through the series of detectors a single time for a mass measurement to be made.