Protrusion Sample Plate for Uniform MALDI Specimens
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
MALDI-TOF mass spectrometry faces challenges in accurately analyzing poorly water-soluble materials due to heterogeneous crystal formation and laser shot-to-shot variability, leading to poor reproducibility and stability of ion signals, especially when preparing specimens with commercial equipment.
Innovation Solution
A method involving a sample plate with protrusions is used to create a uniform specimen of poorly water-soluble materials by mixing the material with a matrix and a volatile solvent, filling it into a pellet cup, and pressing it onto the sample plate's protrusions to form a homogeneous specimen, preventing crushing and bending, and allowing for reproducible MALDI spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pellet cup is pressed directly onto a commercial sample plate to prepare a specimen of poorly water-soluble material, then the specimen can be formed, but the sample plate bends and the specimen edges are crushed or detach during pressing
Solution Approach 1:
The sample plate is segmented into multiple protrusions, each capable of supporting a pellet cup independently. This segmentation distributes the pressing force across multiple localized points rather than requiring the entire plate to bear the load, preventing plate bending while maintaining specimen formation quality.
Solution Approach 2:
The protrusions act as intermediaries between the pressing force and the sample plate substrate. They concentrate and transmit the pressing force locally to form specimens while protecting the overall plate structure from bending, thus mediating between the need for firm pressing and plate integrity.
2Manufacturing precision
If a pellet cup is pressed directly onto a commercial sample plate, then a specimen can be formed, but the specimen may detach from the plate during pressing
Solution Approach 1:
By providing multiple protrusions instead of a single pressing surface, the system creates multiple independent specimen formation zones. Each protrusion-stabilized pellet cup assembly forms specimens reliably without interfering with adjacent specimens, improving overall specimen stability and preventing detachment.
Solution Approach 2:
The protrusions provide localized support and stability exactly where specimens are formed, while the rest of the plate remains unaffected. This local quality enhancement ensures reliable specimen formation and stability at the critical interaction points without compromising the entire system.
3Manufacturing precision
If the sample plate bends during pressing, then specimen formation may be affected, but it becomes difficult to maintain the position of the specimen relative to the irradiated laser during MALDI mass spectrometry
Solution Approach 1:
The segmented protrusion structure allows each protrusion to independently support a pellet cup and formed specimen, isolating the specimen position from plate-level bending. This ensures that laser positioning remains accurate during MALDI mass spectrometry while still achieving uniform specimen thickness through controlled local pressing.
4Ease of manufacture
If a commercial sample plate is used with direct pressing, then the process is simple, but the plate cannot be reused due to bending and distortion
Solution Approach 1:
The segmented protrusion design allows the sample plate to withstand repeated pressing cycles without cumulative bending or distortion. Each protrusion acts as an independent load-bearing element that returns to its original position after pressing, enabling the plate to be reused multiple times while maintaining specimen preparation quality.
Solution Approach 2:
The protrusions are pre-formed on the sample plate before use, providing built-in structural reinforcement at the pressing locations. This preliminary structural preparation prevents bending during operation and enables repeated use without degradation, eliminating the need for plate replacement after single use.
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 ensures the production of specimens with low thickness deviation and reproducible MALDI spectra, enabling quantitative analysis of poorly water-soluble materials using commercial MALDI-TOF MS equipment, while preventing specimen detachment and maintaining the sample plate's integrity for reuse.
Implementation Method 1
introducing a volatile solvent to disperse the poorly water-soluble material and the matrix until the volatile solvent is evaporated
Implementation Method 2
dissolving the pellet cup with water to form a specimen of the poorly water-soluble material
Data Source
AI summary
The present disclosure relates to a method of manufacturing a specimen of a poorly water-soluble material having a uniform thickness by using a sample plate comprising a substrate and a plurality of protrusions located on one surface of the substrate, the protrusion having a flat surface for receiving a force when pressed from the top, and a method for quantitative analysis of a poorly water-soluble material through MALDI mass spectrometry for the specimen.