Structured Semiconductor Substrate for Mass Spectrometry Ionization
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Solution Overview
Problem
Current mass spectrometry techniques, such as MALDI and DIOS, face limitations in sensitivity, especially for low molecular weight analytes due to background noise and the need for hazardous chemicals in the production of nanostructured surfaces for NIMS, which restricts the wider implementation of these methods.
Innovation Solution
A composition and method using a structured semiconductor substrate with microscale or nanoscale pillars and a fluorinated initiator, where at least two pillars are in contact with the initiator, to enhance ionization efficiency and sensitivity in mass spectrometry analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional MALDI preparation method is used, then analyte can be co-crystallized in matrix, but sensitivity for low molecular weight analytes is limited by background noise from matrix ionization
Solution Approach 1:
The invention extracts and removes the matrix component from the traditional MALDI system, replacing it with a matrix-free nanostructured surface. This eliminates the source of background noise (matrix ionization) while maintaining the ability to ionize analyte molecules through the nanostructured surface and initiator combination.
Solution Approach 2:
The invention employs a nanostructured porous surface with high surface area and controlled pore dimensions. This porous structure provides numerous active sites for analyte adsorption and ionization while preventing bulk matrix material from contributing to background noise, thereby improving signal-to-noise ratio for sensitive detection.
2Measurement precision
If electrochemical etching process is used to produce nanostructured NIMS surface, then highly sensitive detection can be achieved, but hazardous chemicals and electric current are required limiting wider implementation
Solution Approach 1:
The invention replaces the electrochemical etching process with a mechanical or physical fabrication method such as photolithography, electron beam lithography, or self-assembly techniques. This substitution eliminates the need for hazardous chemicals and complex electrochemical equipment while achieving comparable or superior nanostructured surfaces for sensitive detection.
Solution Approach 2:
The invention changes the fabrication parameters from electrochemical conditions (requiring hazardous chemicals and controlled potentials) to alternative physical or chemical parameters such as UV exposure, plasma treatment, or solvothermal processing. These parameter changes enable safer, more accessible fabrication while maintaining nanostructure quality for high sensitivity detection.
3Measurement precision
If DIOS method is used, then some success in sensitivity improvement is achieved, but analyte scope is limited
Solution Approach 1:
The invention creates a universal nanostructured surface platform that can detect diverse analyte types including small molecules, peptides, proteins, and biological fluids through a single initiator system. The nanostructured surface provides size-independent adsorption and ionization capabilities, making the method applicable across a broad range of analytes without requiring method optimization for each analyte class.
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
The approach significantly improves the sensitivity of mass spectrometry by reducing background noise and eliminating the need for hazardous chemicals, enabling the detection of a wide range of samples including biofluids and single cells with enhanced ionization efficiency.
Implementation Method 1
a composition for ionizing a target, comprising: a structured substrate having a plurality of microscale or nanoscale pillars; and an initiator, wherein at least two of the plurality of pillars are in contact with the initiator
Data Source
AI summary
Disclosed herein are compositions for ionizing a target and methods for making the compositions. In some embodiments, the compositions can include a structured substrate having a plurality of upright surface features, for example, microscale or nanoscale pillars, in contact with an initiator. Also disclosed herein are methods for ionizing targets.