Shielded Gas Compartment for MALDI Sample Integrity
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Solution Overview
Problem
Sensitive sample substances can be chemically altered by exposure to atmospheric oxygen during mass spectrometric analysis, leading to falsified results due to the lack of effective protective gas systems in existing sample preparation methods.
Innovation Solution
A device with a sample support assembly and a cover forming a shielded gas compartment, where a protective gas is introduced to create an inert atmosphere around the sample sites, preventing oxidation and ensuring accurate analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective gas system is implemented to prevent chemical alteration of sensitive sample substances, then the reliability of mass spectrometric analysis is improved, but the device complexity increases
Solution Approach 1:
The device is divided into a sample support assembly and a separate cover that forms a shielded gas compartment. This segmentation allows the protective gas system to be implemented only where needed (over the sample sites) rather than requiring a complete system overhaul, thus improving reliability while limiting the increase in device complexity to specific modular components.
Solution Approach 2:
A protective gas atmosphere is generated locally only over the sample sites where substances are applied, rather than throughout the entire device. The cover with apertures creates a localized shielded gas compartment that protects only the necessary areas, reducing the overall gas system complexity while ensuring protection where it is most critical for analysis reliability.
2Stability of the object's composition
If a shielded gas compartment is formed with a cover and apertures to protect sample sites, then the chemical integrity of substances is maintained, but the device structure becomes more complex
Solution Approach 1:
The cover serves multiple functions: it forms the shielded gas compartment, provides structural support for the apertures, and acts as a barrier between the sample sites and the external environment. This multi-functionality reduces the need for additional separate components, maintaining chemical integrity while minimizing the increase in overall device structural complexity.
Solution Approach 2:
The apertures are integrated into the cover structure itself, with the cover nesting over the sample support assembly. This nested configuration allows the protective gas compartment to be formed within the existing device architecture rather than requiring separate external structures, thus maintaining chemical integrity with minimal additional structural complexity.
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 device effectively shields sensitive substances from atmospheric influences, maintaining their chemical integrity and facilitating reliable mass spectrometric measurements by maintaining a protective gas atmosphere around the sample sites.
Implementation Method 1
certain sensitive sample substances can be chemically changed when exposed to the atmosphere. For example, a protein-containing liquid sample can react with oxygen in the air, thus oxidizing the proteins.
Data Source
AI summary
Presented is a device for the preparation of samples for ionization by laser desorption, especially MALDI, that comprises a sample support assembly with a surface which has an array of sites for holding substances, and an outer contour surrounding the sample site array, and a flat cover which can be placed flush on or over the surrounding outer contour such that a shielded gas compartment is formed between the cover and the surface, said cover having an array of apertures arranged such that each aperture comes to rest over a corresponding sample site. A gas transport system is also provided on the assembly and cover, which serves to introduce a protective gas into the shielded gas compartment between cover and surface so that a protective gas atmosphere is generated in the gas compartment to protect the substances on the sample sites against atmospheric influences. An associated method is also described.