Parylene-Coated MALDI Sample Plate for Low Mass Analysis
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Solution Overview
Problem
MALDI-TOF mass spectrometry faces challenges in analyzing compounds with molecular weights similar to those of typical matrix materials, leading to interference from decomposed matrix components, and the use of metal nanowires for ionization is difficult to scale due to high manufacturing costs and complexity.
Innovation Solution
A sample plate with an organic matrix coated in a Parylene thin film is used, where the Parylene film entirely covers the matrix, preventing matrix components from reaching the detector and allowing accurate analysis of compounds with molecular weights of several hundred Da.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical organic matrix material is used for MALDI-TOF mass spectrometry, then ionization efficiency is improved, but mass spectrum interference occurs when the compound's molecular weight is similar to the matrix material's molecular weight
Solution Approach 1:
The patent extracts and removes the harmful matrix decomposition components from reaching the detector by introducing a Parylene thin film barrier layer between the matrix and the detector, while maintaining the ionization function of the matrix
Solution Approach 2:
The Parylene thin film acts as an intermediary barrier that allows ion transmission from the matrix region to the detector while blocking larger matrix decomposition components, enabling accurate mass measurement of compounds with molecular weights similar to the matrix
2Measurement precision
If metal nanowires are used instead of matrix for ionization, then mass spectrum interference is eliminated, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent replaces the complex, expensive metal nanowire structures with a simple, inexpensive organic matrix combined with a thin Parylene film that can be easily manufactured and disposed of, achieving the same analytical function without the manufacturing complexity
Solution Approach 2:
The patent changes the approach from using inorganic nanowire structures to using organic matrix materials with a polymer thin film barrier, fundamentally altering the material parameters while achieving the desired ionization and filtration functions
3Reliability
If VLS synthesis is used to grow nanowires on metal catalysts, then ionization performance is improved, but the high-temperature and high-pressure process increases manufacturing cost and complexity
Solution Approach 1:
The patent replaces the complex mechanical VLS synthesis process requiring high-temperature and high-pressure equipment with a simple coating process using spin-coating or drop-casting to form the Parylene thin film on the matrix, dramatically simplifying manufacturing
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 accurate mass spectrometry of compounds with molecular weights between 100 and 1000 Da by ensuring that only the ions of the analyte reach the detector, avoiding interference from the matrix, and simplifies the manufacturing process compared to nanowire-based methods.
Implementation Method 1
a Parylene thin film formed on the target plate on which the organic matrix is formed, the Parylene thin film entirely covering the organic matrix
Implementation Method 2
mixing an ionization-assisting matrix with a compound (sample), forming a target including the mixture, and radiating a laser beam onto the target. This method ionizes the sample using the characteristics of the sample in that it is easily ionized with the assistance of the matrix
Data Source
AI summary
A sample plate in use with a MALDI-TOF (matrix-assisted laser desorption ionization time-of-flight) mass spectrometer. The sample plate is usable for the mass spectrometry of a polymeric material on the order of several hundreds of Da and a method of manufacturing the same sample plate. The sample plate including a target plate, an organic matrix formed on one surface of the target plate, and a Parylene thin film formed on the target plate on which the organic matrix is formed, the Parylene thin film entirely covering the organic matrix.