Recombinant Amebocyte Factor Cartridge for Stable Endotoxin Detection

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Solution Overview

Problem

Current assays for detecting microbial endotoxin rely on amebocyte lysates from horseshoe crabs, raising ecological sustainability concerns, and fully synthetic or recombinant reagents lack the sensitivity and accuracy of native lysates.

Innovation Solution

Stabilize recombinant Factor C (rFC) and Factor B (rFB) by maintaining them separately until use, using cartridges with distinct regions for each, allowing mixing only in the presence of a test sample, and incorporating recombinant pro-clotting enzyme and chromogenic substrates for accurate endotoxin detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If recombinant Factor C and Factor B are mixed together in advance, then the assay can be performed conveniently, but the composition becomes unstable and loses activity

Engineering Contradiction:

Improveconvenience of assay preparationVSAvoidstability of recombinant factor composition

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The cartridge is divided into distinct first and second regions that are spatially separated. The first region contains Factor C while the second region contains Factor B, preventing premature mixing. This segmentation maintains stability while allowing convenient single-step mixing upon sample addition.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The factors are pre-positioned in their respective regions within the cartridge before use, but kept separated. This preliminary arrangement allows the factors to be ready for immediate mixing when the sample is added, combining preparation convenience with stability maintenance.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If horseshoe crab blood is harvested for amebocyte lysate, then high sensitivity and accuracy for endotoxin detection is achieved, but ecological sustainability is compromised

Engineering Contradiction:

Improvesensitivity and accuracy of endotoxin detectionVSAvoidecological sustainability impact

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

Instead of using native horseshoe crab amebocyte lysate, the patent uses recombinant factors (Factor C and Factor B) produced through genetic engineering in alternative host systems. These recombinant copies replicate the endotoxin-detecting functionality without requiring harvesting from living horseshoe crabs, thus maintaining measurement precision while eliminating ecological harm.

Inventive Principle:

Principle #26Copying

3Object-affected harmful factors

If recombinant factors are used instead of native amebocyte lysate, then ecological sustainability is improved, but sensitivity and accuracy of detection deteriorates

Engineering Contradiction:

Improveecological sustainabilityVSAvoidsensitivity and accuracy of endotoxin detection

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The patent optimizes various parameters including the purification state of recombinant factors (providing highly pure forms), the formulation conditions (buffers, pH, temperature control), and the spatial arrangement in the cartridge to ensure that recombinant factors achieve detection sensitivity and accuracy comparable to native lysates while maintaining ecological sustainability.

Inventive Principle:

Principle #35Parameter changes

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

Provides a stable and sensitive method for detecting bacterial endotoxin without relying on horseshoe crab-derived materials, maintaining assay accuracy and ecological sustainability.

Implementation Method 1

These assays typically exploit, in one way or another, a clotting cascade that occurs when the hemocyte lysate is exposed to an endotoxin

Methodology Applied

Scientific EffectClotting cascade: Coagulation

Implementation Method 2

incorporating recombinant pro-clotting enzyme and chromogenic substrates for accurate endotoxin detection

Methodology Applied

Scientific EffectChromogenic reaction:

Data Source

PatentUS12540944B2Recombinant amebocyte clotting factors and uses thereof

Publication Date: 2026.02.03 CHARLES RIVER LABORATORIES INC

AI summary

Provided are recombinant amebocyte clotting factors, their formulation and use in determining the presence and/or amount of a microbial endotoxin in a sample. Also provided is a cartridge containing the recombinant amebocyte clotting factors for determining the presence and/or amount of a microbial endotoxin in a sample.