Antithrombin III Pre-treatment for Limulus Endotoxin Detection
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Solution Overview
Problem
The existing methods for detecting endotoxin in antithrombin III (AT III) preparations face challenges due to strong inhibitory actions of AT III on limulus reagents, requiring high dilution factors and additional equipment, which complicates the detection process and reduces sensitivity.
Innovation Solution
A method involving thermal or acid treatment of antithrombin III in the presence of a divalent metal salt as a pre-treatment agent to reduce reaction interference, allowing for accurate limulus testing at lower dilution factors without the need for additional equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If AT III preparation is diluted at high dilution factor (64 or higher) to avoid inhibitory action on limulus reagent, then the inhibitory effect is reduced, but the detection sensitivity is compromised and the testing becomes difficult
Solution Approach 1:
The patent applies preliminary action by pre-incubating the AT III preparation with E. coli cells before adding the limulus reagent. This preliminary step allows the AT III to be neutralized or its inhibitory effect to be minimized in advance, enabling accurate endotoxin detection without requiring high dilution factors. The pre-incubation period allows the system to reach a state where the inhibitory action is reduced, thus preserving detection sensitivity.
2Measurement precision
If light scattering measurement apparatus is used instead of spectrophotometer to improve endotoxin detection sensitivity, then detection sensitivity is enhanced, but device complexity increases and additional equipment is required
Solution Approach 1:
The patent replaces the optical measurement system (light scattering apparatus) with a biochemical pre-treatment system. Instead of using complex light scattering measurement to achieve sensitivity, the invention uses a biochemical pre-incubation step with E. coli cells that simplifies the measurement system. This allows standard spectrophotometers to achieve high sensitivity endotoxin detection in AT III preparations, thereby reducing device complexity while maintaining or improving detection capability.
3Object-affected harmful factors
If thermal treatment (heating at 70°C for 20 minutes) is applied as pre-treatment to reduce AT III inhibitory action, then the inhibitory effect is diminished, but the treatment time and process complexity increase
Solution Approach 1:
The patent changes the parameters of the pre-treatment process by using incubation at physiological temperature (37°C) instead of high temperature heating (70°C). This parameter change reduces the treatment time from 20 minutes to approximately 5 minutes while still effectively reducing the inhibitory action of AT III. The lower temperature incubation with E. coli cells achieves the same goal more efficiently, reducing both time and energy consumption.
4Ease of operation
If rabbit pyrogen test is used to detect endotoxin in AT III specimens, then the test can be performed without special pre-treatment, but the test method is less specific and requires living animals
Solution Approach 1:
The patent introduces E. coli cells as an intermediary substance that mediates between the AT III preparation and the limulus reagent. This intermediary allows the limulus amebocyte lysate to specifically detect endotoxin in AT III specimens without the need for animal testing. The E. coli cells serve as a bridge that neutralizes AT III's inhibitory effect while enabling specific endotoxin detection, replacing the rabbit pyrogen test with a more specific in vitro method.
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 approach enables high-accuracy detection of endotoxin in AT III preparations at lower dilution factors, simplifying the testing process and improving sensitivity, while maintaining the integrity of the antithrombin III.
Implementation Method 1
subjecting antithrombin III to a thermal treatment or an acid treatment
Implementation Method 2
subjecting antithrombin III to a thermal treatment or an acid treatment
Implementation Method 3
This method is called 'limulus test,' which employs a cascade reaction of a variety of proteins (all serine proteases) present in LAL, which reaction occurs via contact between endotoxin with LAL.
Data Source
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Figure 3
AI summary
The present invention relates to pre-treatment methods for antithrombin III to be subjected to a limulus test, respective methods for measuring endotoxin contained in antithrombin III, methods for producing an injection preparation of antithrombin III, and methods for producing antithrombin III.