MALDI Sample Holder with TiO2 Nanoparticles for Analyte Concentration
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Solution Overview
Problem
Current sample holders for MALDI analysis lack controlled wettability, containment structures, and compatibility with biological sample treatments, leading to reduced analyte concentration, sensitivity, and cross-contamination issues, particularly in MALDI Imaging techniques.
Innovation Solution
A sample holder with a non-metallic, antistatic, and hydrophobic support coated with metallic oxide nanoparticles, which are treated with UV radiation to create a super-hydrophilic surface for effective drop containment and in situ sample treatment, allowing for improved analyte concentration and compatibility with biological samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-metallic hydrophobic support is used, then cross-contamination is reduced and compatibility with biological treatments is improved, but analyte concentration and sensitivity are reduced
Solution Approach 1:
The support surface is divided into two distinct zones with opposite wettability properties: a hydrophobic outer region for containment and a hydrophilic central region (functionalized with TiO2 nanoparticles) for analyte concentration. This local differentiation allows simultaneous achievement of both containment reliability and analyte concentration.
Solution Approach 2:
The support combines non-metallic hydrophobic material with metallic oxide nanoparticles (TiO2) to create a composite surface structure. This composite material exhibits dual wettability characteristics, merging the advantages of both material types: hydrophobicity for containment and hydrophilicity for analyte concentration.
2Quantity of substance
If metallic oxide nanoparticles are added to create hydrophilic surface, then analyte concentration is improved, but device complexity increases
Solution Approach 1:
The wettability parameter of the support surface is changed by introducing TiO2 nanoparticles, transforming it from uniformly hydrophobic to having a hydrophilic central region. This parameter change enables analyte concentration without requiring complex structural modifications.
3Reliability
If UV radiation treatment is applied to create super-hydrophilic surface, then drop containment and in situ treatment are improved, but manufacturing complexity increases
Solution Approach 1:
The support is pre-functionalized with TiO2 nanoparticles during manufacturing, creating a latent hydrophilic surface that can be activated by UV radiation. This preliminary action simplifies the overall process by preparing the surface in advance rather than requiring complex post-processing treatments.
Solution Approach 2:
UV radiation induces a phase transition in the TiO2 nanoparticle surface from a less hydrophilic state to a super-hydrophilic state. This phase transition enables effective drop containment and in situ treatment capabilities without requiring complex structural modifications.
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 sample holder enhances analyte concentration, sensitivity, and compatibility with biological treatments, reducing cross-contamination and sample loss, while maintaining hydrophobicity of the support, and enabling precise MALDI Imaging without tissue movement or detachment.
Implementation Method 1
the same treatment with UV radiation does not alter the hydrophobicity of the support in case a) or of the material of said layer in case b)
Implementation Method 2
a non-metallic, antistatic and hydrophobic material, having a volume resistivity lower than 1012Ω×cm and a contact angle in a water wettability measurement at least equal to 90°
Implementation Method 3
the drop of the initial solution is positioned and spreads in non-repeatable manner on its surface
Implementation Method 4
The part of the charge generated in the ionization and not transferred to the analyte is dissipated through the sample holder, which must be made (or have the surface covered) with a conductive material.
Data Source
AI summary
There are described a new type of sample holder for performing analyses of biological samples with mass spectrometry in MALDI mode, the process for its production and some protocols for the use of the sample holder in said technique. The sample holder, in its simplest embodiment (10), consists of a support (11) on a face (12) of which there is at least one porous deposit (13) consisting of nanoparticles of an oxide of a Group 4 metal.