Factor Xa Reagent Composition for Slower Anticoagulant Detection
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Solution Overview
Problem
Existing methods for detecting and measuring factor Xa inhibitors in test samples are limited by rapid coagulation rates, which can lead to inaccurate or incomplete detection, especially when using high volumes or concentrations of factor Xa.
Innovation Solution
The use of factor Xa reagents containing guanidine derivatives, such as alkylated guanidines, which modulate factor Xa activity, allowing for slower reaction rates and enabling accurate detection of factor Xa inhibitors by extending the reaction time and allowing for higher sample volumes and concentrations of factor Xa to be used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high volumes or concentrations of factor Xa are used in the detection method, then the sensitivity of detection is improved, but the coagulation rate becomes too rapid leading to inaccurate or incomplete detection
Solution Approach 1:
The patent changes the chemical composition parameters of the reaction system by introducing guanidine derivatives (such as arginine, homocitrulline, or their salts) to modify the coagulation kinetics. These additives alter the reaction environment to slow down the coagulation rate, enabling accurate measurement even when high concentrations of factor Xa are used to improve detection sensitivity.
2Measurement precision
If high volumes or concentrations of factor Xa are used to improve detection sensitivity, then measurement precision is improved, but the reaction time becomes too short for complete detection
Solution Approach 1:
By modifying the reaction environment with guanidine derivatives, the patent extends the effective reaction time window. This allows the system to maintain high factor Xa concentrations for improved sensitivity while the modified kinetics provide sufficient time for complete detection before the coagulation process terminates the reaction.
3Productivity
If the coagulation process proceeds rapidly, then productivity is improved, but measurement precision deteriorates due to inaccurate or incomplete detection
Solution Approach 1:
The patent optimizes the reaction conditions by incorporating guanidine derivatives that moderate the coagulation kinetics. This creates an ideal balance where the reaction proceeds efficiently with good productivity while maintaining measurement precision through extended reaction time and reduced coagulation rate, enabling accurate detection of factor Xa inhibitors.
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 more precise and accurate detection of factor Xa inhibitors by slowing down the coagulation process, facilitating the use of greater test sample volumes and concentrations, thereby improving the sensitivity and reliability of detection methods.
Implementation Method 1
one or more of guanidine derivatives... The composition may modulate the activity of the factor Xa in the sample, where modulation comprises reducing a rate of coagulation or substrate cleavage caused by factor Xa
Data Source
Figure 1A~1C
Figure 1D~1F
Figure 1G
AI summary
An example composition includes factor Xa, a substrate, one or more of guanidine derivatives, and, in some cases, heparin. An example method for detecting an anticoagulant in a sample includes combining or contacting the sample with the composition and measuring activity of the factor Xa based on a state of the substrate. The composition modulates the activity of the factor Xa in the sample, where modulation includes reducing a rate of coagulation of the sample caused by factor Xa. A presence of the anticoagulant is based on the activity of the factor Xa.