Lateral Flow Blotting Assay Substrate Design

Solution Overview

Problem

Traditional blotting techniques for detecting immobilized analytes are time-consuming and prone to errors due to multiple washing and blocking steps, which consume reagents and lead to irreproducibility.

Innovation Solution

A porous substrate with a reagent reservoir region and a lateral flow region separated by hydrophobic or impermeable barriers, allowing for controlled lateral flow of binding reagents to contact immobilized analytes, reducing the need for extensive washing and blocking steps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional blotting techniques are used with multiple washing and blocking steps, then detection sensitivity can be maintained, but time consumption and reagent consumption increase significantly

Engineering Contradiction:

Improvedetection sensitivityVSAvoidtime consumption

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The substrate is divided into distinct regions: a first region for capturing analytes and a second region for detecting bound ligands. This spatial segmentation allows simultaneous capture and detection without requiring sequential washing steps between operations, thereby reducing time consumption while maintaining detection sensitivity through dedicated functional zones.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Capture reagents are pre-immobilized on the first region of the substrate before sample application. This preliminary preparation eliminates the need for post-capture washing steps, as the capture function is already established. The system is ready for immediate detection once the sample is applied, significantly reducing overall procedure time while preserving detection sensitivity.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If traditional blotting techniques are used with multiple washing and blocking steps, then detection sensitivity can be maintained, but reagent consumption increases

Engineering Contradiction:

Improvedetection sensitivityVSAvoidreagent consumption

Core Design Contradiction:

Measurement precisionVSLoss of substance

Solution Approach 1:

The substrate is divided into distinct regions: a first region for capturing analytes and a second region for detecting bound ligands. This spatial segmentation allows simultaneous capture and detection without requiring sequential washing steps between operations, thereby reducing time consumption while maintaining detection sensitivity through dedicated functional zones.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The detection function is extracted and separated from the capture function, placed in a distinct second region. This extraction eliminates the need for extensive washing and blocking steps that would otherwise be required to prevent cross-interference, thereby reducing reagent consumption while preserving detection sensitivity through spatial isolation of functions.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If traditional blotting techniques are used, then detection can be performed, but procedural complexity and source of error increase

Engineering Contradiction:

ImprovereproducibilityVSAvoidprocedural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The substrate is divided into distinct regions: a first region for capturing analytes and a second region for detecting bound ligands. This spatial segmentation allows simultaneous capture and detection without requiring sequential washing steps between operations, thereby reducing time consumption while maintaining detection sensitivity through dedicated functional zones.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The capture and detection functions are merged into a single substrate structure with spatially separated regions. This integration eliminates the need for separate washing and blocking steps between capture and detection operations, reducing procedural complexity and minimizing sources of error while maintaining reliability through the structured design.

Inventive Principle:

Principle #5Merging (Combining)

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 method enhances the efficiency and reproducibility of analyte detection by minimizing reagent consumption and error, enabling multiplex detection of analytes on a membrane with improved precision and reduced procedural complexity.

Implementation Method 1

an impermeable or hydrophobic barrier, said impermeable or hydrophobic barrier substantially blocking flow of a liquid from the reagent reservoir region into the lateral flow region until lateral flow is initiated

Methodology Applied

Scientific EffectHydrophobic barrier: Hydrophobe