Matrix Dot Laser Enclosure for MALDI Quantitation
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Solution Overview
Problem
In MALDI mass spectrometry, the variability in sample preparation techniques and matrix application leads to inconsistent results, making precise quantitative analysis challenging due to dependence on operator skill and uneven matrix crystal diameters, which affects sensitivity and precision.
Innovation Solution
The method involves applying a laser beam to a matrix dot on a measurement sample in a manner where either the laser spot is completely enclosed within the matrix dot or vice versa, ensuring consistent ionization and precise quantitation by controlling the relationship between the matrix dots and the laser beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If various methods for applying a matrix to a sample are used in MALDI mass spectrometry, then ionization can be performed even with a very small amount of sample, but the obtained results greatly change depending on the skills of persons who prepare samples, making precise quantitative analysis difficult
Solution Approach 1:
The patent applies parameter changes by controlling the laser beam parameters (spot size, energy density, pulse duration) and matrix dot parameters (diameter, distribution density, uniformity) to achieve consistent ionization conditions. By standardizing these parameters, the method enables precise quantitative analysis while maintaining sensitivity for small sample amounts.
Solution Approach 2:
The patent employs preliminary action by pre-forming matrix dots with controlled diameters and uniform distributions on the sample surface before laser irradiation. This preliminary structuring of the matrix ensures that subsequent laser irradiation produces consistent ionization results, eliminating variability introduced by manual matrix application techniques.
2Ease of manufacture
If manual matrix application methods are used in MALDI mass spectrometry, then the process is simple and easy to perform, but the matrix crystal diameters become uneven, affecting sensitivity and precision
Solution Approach 1:
The patent replaces manual mechanical matrix application with a controlled matrix dot formation process. Instead of relying on operator skill to apply matrix uniformly, the method uses controlled deposition techniques to create matrix dots with predetermined diameters and uniform distributions, thereby achieving high precision while maintaining operational simplicity.
Solution Approach 2:
The patent introduces matrix dots as an intermediary structure between the sample and the laser beam. These pre-formed dots serve as standardized intermediaries that ensure uniform matrix distribution and consistent laser-matrix interaction, eliminating the need for skilled manual application while maintaining ease of operation.
3Productivity
If the laser spot is not completely enclosed in the matrix dot or vice versa, then the analysis can be performed quickly, but the ionization consistency deteriorates, reducing measurement precision
Solution Approach 1:
The patent applies parameter changes by optimizing the relationship between laser spot diameter and matrix dot diameter. By controlling these parameters so that one is completely enclosed within the other, the method achieves both rapid analysis and consistent ionization, resolving the contradiction between productivity and measurement precision.
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 highly precise and quantifiable mass spectrometry by ensuring consistent matrix application and ionization, reducing variability and improving sensitivity, especially when analyzing multiple components in a single sample.
Implementation Method 1
a laser beam irradiation step of applying a laser beam to a matrix dot disposed on a surface of a measurement sample
Implementation Method 2
Mass spectrometry is an analytical method where a sample containing a target molecule is ionized to separate and detect ions
Data Source
AI summary
Provided is mass spectrometry including applying a laser beam to a matrix dot disposed on a surface of a measurement sample. One of: a laser spot appearing in the measurement sample when the laser beam is applied to the matrix dot; and the matrix dot, is completely enclosed in the other.