Liquid Crystal Microdomains for Endotoxin Detection

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Solution Overview

Problem

Current methods for detecting and quantifying endotoxin lipopolysaccharide (LPS) are complex, require skilled technicians, and have limitations such as interference from substances and variable enzyme activity, necessitating a more sensitive, rapid, and cost-effective assay.

Innovation Solution

A liquid crystal-based sensor using micrometer-sized droplets with curved interfaces and topological defects that change anchoring configurations in response to LPS, allowing for detection and quantification within minutes at concentrations as low as 0.1-1000 pg/mL.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If LAL-based assays are used for endotoxin detection, then sensitivity can reach pg/mL range, but the assay complexity increases requiring skilled technicians and standardized procedures

Engineering Contradiction:

Improvedetection sensitivityVSAvoidassay complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the complex biochemical LAL assay system with a physical liquid crystal-based detection system. Liquid crystal droplets undergo anchoring transitions in response to endotoxin binding, which can be detected through optical methods, eliminating the need for complex enzymatic reactions and standardized procedures

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention utilizes changes in liquid crystal anchoring parameters (from planar to homeotropic anchoring) in response to endotoxin binding. This parameter change is detectable through optical properties, providing a simplified yet sensitive detection method that avoids the complexity of maintaining enzyme activity standards

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If LAL-based assays are used for endotoxin detection, then quantification can be achieved, but the assay time and resource requirements increase

Engineering Contradiction:

Improvequantification capabilityVSAvoidassay time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The liquid crystal droplets are pre-prepared with specific anchoring configurations that are ready to respond immediately upon endotoxin exposure. This eliminates the need for complex assay setup and incubation times required by LAL methods, enabling rapid detection within minutes

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces time-consuming enzymatic reactions with immediate physical binding events that cause rapid anchoring transitions in liquid crystals. The optical detection of these transitions provides quick quantification without the extended incubation and measurement steps of LAL assays

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If LAL reagents are used for endotoxin detection, then sensitivity is achieved, but reagent cost and storage requirements increase

Engineering Contradiction:

Improvedetection sensitivityVSAvoidreagent cost and storage

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The liquid crystal droplets can be prepared as disposable, stable formulations that do not require expensive animal-derived reagents. The droplets maintain their detection capability without complex storage conditions, reducing both material costs and infrastructure requirements for reagent storage and handling

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Reliability

If LAL-based assays are used for endotoxin detection, then detection capability is maintained, but interference from substances reduces reliability

Engineering Contradiction:

Improvedetection reliabilityVSAvoidsubstance interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The liquid crystal droplets are designed with specific local properties at their interfaces that enable selective binding of endotoxin. The anchoring transitions occur locally at the droplet interface where endotoxin binds, providing a detection mechanism that is less susceptible to interference from bulk solution substances compared to LAL assays

Inventive Principle:

Principle #3Local quality

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 sensor achieves high sensitivity and specificity for LPS detection, outperforming existing methods by enabling rapid quantification of LPS in aqueous samples with minimal interference, using a non-biological, low-cost approach.

Implementation Method 1

micrometer-sized domains of liquid crystals to detect analytes such as endotoxin lipopolysaccharide (LPS) in an aqueous solution

Methodology Applied

Scientific EffectLiquid crystal anchoring configuration transition: Liquid Crystals

Implementation Method 2

LPS isolated from different species of bacteria do not activate LAL equally

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS9547018B2Analyte detection using liquid crystals

Publication Date: 2017.01.17 WISCONSIN ALUMNI RES FOUND

AI summary

Devices and methods for using changes in the defects in micrometer sized dispersed liquid crystal domains to detect or quantify analytes in a test sample, including endotoxin lipopolysaccharide (LPS), are disclosed. The dispersed liquid crystal microdomains are exposed to the test sample, and any changes in the number of defects in the liquid crystal microdomains are detected by detecting changes in the anchoring configuration of the microdomains. Such changes in anchoring configuration indicate the presence of analyte in the test sample.