TLC Plate with Segmented Permeation Layer for UV Detection

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Solution Overview

Problem

Conventional thin layer chromatography (TLC) plates with separating media containing polysaccharide derivatives and aromatic rings face challenges in detecting substances due to lack of optical responsiveness, leading to inaccurate separation and detection of target substances, especially when substances are adsorbable by the first layer and have different migration speeds between layers.

Innovation Solution

A TLC plate design featuring a substrate with a separating medium layer and a permeation layer that allows permeation of target substances, where the permeation layer has different optical responsiveness to ultraviolet rays than the separating medium layer, stacked discontinuously or in a dotted manner to enhance detection and separation accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a separating medium layer containing polysaccharide derivatives with aromatic rings is used to achieve separation of optical isomers, then separation property is improved, but optical responsiveness to ultraviolet rays deteriorates, making detection difficult

Engineering Contradiction:

Improveseparation propertyVSAvoidoptical responsiveness

Core Design Contradiction:

Stability of the object's compositionVSDifficulty of detecting and measuring

Solution Approach 1:

The TLC plate is divided into two distinct layers: a separating medium layer containing polysaccharide derivatives for chiral separation, and a permeation layer with UV-optical responsiveness for detection. This segmentation allows each layer to specialize in its function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The permeation layer acts as an intermediary between the separating medium layer and the detection system. It receives the separated substances through permeation and provides the optical responsiveness needed for UV detection, thus mediating between separation and detection functions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Difficulty of detecting and measuring

If a continuous permeation layer is stacked on the separating medium layer to enable detection, then optical responsiveness is improved, but migration speed differences cause spots to shift positions, deteriorating measurement precision

Engineering Contradiction:

Improveoptical responsivenessVSAvoidspot position accuracy

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The permeation layer is segmented into discrete dotted regions rather than being continuous. This segmentation creates multiple independent permeation zones that allow substances to migrate vertically without lateral displacement, preserving spot position accuracy while enabling UV detection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The permeation layer is applied locally at specific dotted positions on the separating medium layer rather than uniformly across the entire surface. This local quality approach ensures that permeation occurs only where needed, maintaining the relative positions of separated spots while providing detection capability at those specific locations.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If the permeation layer is applied in a dotted manner to maintain spot positions, then measurement precision is improved, but the area for permeation is reduced, potentially affecting detection sensitivity

Engineering Contradiction:

Improvespot position accuracyVSAvoidpermeation area

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The dotted permeation layer provides sufficient permeation area through multiple distributed dots rather than requiring a continuous large-area layer. The cumulative area of numerous small dots achieves the necessary permeation capacity while maintaining spot position precision, representing a partial action approach that is sufficient for the detection need.

Inventive Principle:

Principle #16Partial or excessive action

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

Enables accurate separation and detection of target substances within one plate, reducing complex procedures and improving detection accuracy by utilizing a permeation layer with distinct optical responsiveness to ultraviolet rays, addressing issues of adsorbability and migration speed differences.

Implementation Method 1

a permeation layer stacked on the separating medium layer and allowing permeation of a target substance separated in the separating medium layer

Methodology Applied

Scientific EffectPermeation: Permeation

Implementation Method 2

the permeation layer has optical responsiveness for ultraviolet rays different from that of the separating medium layer

Methodology Applied

Scientific EffectOptical responsiveness: Absorption (EM radiation)

Data Source

PatentEP2765418B1Thin-layer chromatography plate

Publication Date: 2023.03.08 DAICEL CORP

Figure 1(a)~2(b)
Figure 3~4(4)
Figure 5

AI summary

An object of the present invention is to provide a TLC plate which allows separation and detection of target substances on one plate. Provided is a TLC plate comprising a substrate, a separating medium layer stacked on the substrate, and a permeation layer stacked on the separating medium layer and allowing permeation of a target substance separated in the separating medium layer, wherein the separating medium layer has separating property for the target substance and optical responsiveness for ultraviolet rays, and the permeation layer has optical responsiveness different from that of the separating medium layer.