Automated SP-ICP-MS Data Analysis for Nanoparticle Characterization
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Solution Overview
Problem
Current Single-Particle Inductively Coupled Plasma Mass Spectrometry (SP-ICP-MS) techniques generate large data sets that require significant processing time, often leading to inaccuracy and lack of precision due to manual data analysis and multiple sample dilutions, which introduce errors and artifacts.
Innovation Solution
An automated method for analyzing SP-ICP-MS data sets that involves accessing multiple pulse count values for each detected particle, determining a threshold to differentiate peak signals from background signals, and constructing histograms for particle mass, size, and concentration, allowing for efficient and precise determination of particle characteristics without extensive dilutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual data analysis is used for SP-ICP-MS data sets, then analysis can be performed, but processing time is excessive and accuracy/precision deteriorates
Solution Approach 1:
The patent replaces manual mechanical data analysis with an automated computer-based system that processes SP-ICP-MS data sets. The system automatically detects peaks, determines particle masses, and generates size distributions without human intervention, thereby eliminating the trade-off between processing time and accuracy that plagues manual analysis.
Solution Approach 2:
The automated analysis system performs self-service by independently processing the entire data set from raw signals to final particle size distributions. The system automatically identifies peaks, calculates particle masses using calibration curves, and generates comprehensive analysis results without requiring manual intervention at any stage, thus achieving both high speed and high precision simultaneously.
2Quantity of substance
If multiple sample dilutions are performed to analyze particle concentrations, then measurement range is expanded, but errors and artifacts are introduced
Solution Approach 1:
The patent changes the measurement parameter from requiring multiple dilution steps to using a single undiluted or minimally diluted sample. The automated analysis system can handle a wide dynamic range of particle concentrations (from 10^3 to 10^8 particles/mL) by automatically adjusting analysis parameters and using calibration curves, thereby expanding the measurable quantity range without introducing dilution-related errors.
Solution Approach 2:
The patent extracts and eliminates the problematic dilution steps from the analysis workflow. By using automated peak detection and calibration-based quantification, the system can directly analyze undiluted or minimally diluted samples, removing the source of dilution errors and artifacts while maintaining the ability to measure across a wide concentration range.
3Productivity
If fast data acquisition is used to reduce processing time, then productivity is improved, but data analysis accuracy may deteriorate
Solution Approach 1:
The patent replaces slow manual data analysis with an automated computer-based system that can process fast acquisition data sets efficiently. The automated peak detection and particle mass calculation algorithms can handle high-speed data streams without sacrificing accuracy, thereby enabling the use of fast acquisition modes to improve productivity while maintaining precise particle detection.
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 enables efficient, accurate, and precise analysis of particle mass, size, and concentration, reducing processing time and eliminating errors associated with manual data handling, while differentiating between dissolved and solid nanoparticle signals.
Implementation Method 1
an ICP torch and RF coil for generating the argon plasma that serves as the ion source
Implementation Method 2
The plasma dries the aerosol, dissociates the molecules, then removes an electron from the components, thereby forming singly-charged ions
Implementation Method 3
a mass spectrometer that acts as a mass filter to sort ions by their mass-to-charge ratio (m/z)
Implementation Method 4
Upon exiting the mass spectrometer, ions strike the first dynode of an electron multiplier, which serves as a detector. The impact of the ions releases a cascade of electrons, which are amplified until they become a measurable pulse
Data Source
AI summary
The present disclosure provides methods and systems for automated analysis of spectrometry data corresponding to particles of a sample, such as large data sets obtained during single particle mode analysis of an inductively coupled plasma mass spectrometer (SP-ICP-MS). Techniques are presented herein that provide appropriate smoothing for rapid data processing without an accompanying reduction (or with an acceptably negligible reduction) in accuracy and/or precision.