Ambient Ionization Matrix Effect Reduction via Sample Volume Control
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Solution Overview
Problem
Ambient ionization in chemical analysis is hindered by matrix effects due to background chemicals, which suppress the detection of molecules of interest by competing for ionization and overwhelming the spectrometer signals.
Innovation Solution
Reducing the sample volume and diluting with a non-interfering solvent like water, or adding specific background chemicals to suppress other background ions, allowing for more efficient ionization and detection of target molecules in the ambient ionization process, particularly in plasma-based systems like mass and ion mobility spectroscopy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ambient ionization is performed in laboratory or field setting, then molecules of interest can be detected, but background chemicals suppress detection by competing for ionization and overwhelming spectrometer signals
Solution Approach 1:
The patent extracts and removes background chemicals from the ionization region prior to ambient ionization of the sample. This is achieved by selectively eliminating interfering substances that would otherwise compete for ionization and suppress the detection of molecules of interest, thereby resolving the contradiction between maintaining ambient detection capability and eliminating matrix effects.
Solution Approach 2:
The patent performs preliminary removal of background chemicals before the ambient ionization process occurs. By pre-cleaning the ionization region and eliminating interfering substances in advance, the system ensures that when ambient ionization takes place, there are minimal matrix effects to suppress the detection of target molecules.
2Object-affected harmful factors
If sample volume is reduced, then background chemical ions are decreased, but detection sensitivity for molecules of interest may be compromised
Solution Approach 1:
The patent changes the parameter of sample volume to a reduced level, which directly decreases the amount of background chemicals present in the ionization region. This parameter change effectively reduces background chemical interference while the system maintains adequate detection sensitivity through the selective removal of interfering substances rather than through signal amplification.
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 sensitivity and specificity of detecting molecules of interest by minimizing the impact of background chemicals, thereby improving the signal-to-noise ratio and enabling the detection of analytes that were previously obscured.
Implementation Method 1
an ionizing gas to convert the molecules of interest to ions
Implementation Method 2
plasma-based ambient ionization
Data Source
AI summary
In an embodiment of the present ambient ionization experiment, the abundance of background chemicals relative to ions of interest is decreased by reducing the overall abundance of background chemicals introduced into the ionizing region. In an embodiment of the present invention, the reduction of unwanted background chemicals in the ionization region can be effected by limiting the area which the sample volume is deposited. In an embodiment of the present invention, the reduction of unwanted background chemicals in the ionization region can be effected by decreasing the duration of time that the sample is exposed to the atmospheric pressure ionization source. In an embodiment of the present invention, the reduction of unwanted background chemicals in the ionization region can be effected by limiting the sample volume. In an embodiment of the present invention dilution of the sample with water can be used to reduce the contribution of the background chemicals. In an embodiment of the present ambient ionization experiment, an ion intensifier is used to suppress ionization of background chemicals to permit more efficient ionization and detection of the molecules of interest.