Tacrolimus Extraction Using Aqueous Detergents
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Solution Overview
Problem
Current tacrolimus quantification methods rely on organic solvents, which are hazardous, volatile, and require manual, labor-intensive sample preparation, limiting automation and accuracy due to evaporation issues and human error.
Innovation Solution
A fully automated method using non-precipitating, non-denaturing aqueous solutions with bile salts or zwitterionic detergents like CHAPS to extract tacrolimus from blood samples, eliminating the need for organic solvents and centrifugation, and allowing for complete automation of the quantification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If organic solvents are used to extract tacrolimus from blood samples, then extraction efficiency is improved, but safety hazards and volatility increase
Solution Approach 1:
The patent changes the chemical parameter of the extraction medium from organic solvents (methylene chloride, ethyl acetate, methanol) to aqueous solutions containing non-ionic detergents (Triton X-100, Tween 80, Brij 35). This parameter change maintains extraction efficiency while eliminating the harmful properties of organic solvents including flammability, toxicity, and excessive volatility.
2Measurement precision
If organic solvents are used for tacrolimus extraction, then extraction effectiveness is improved, but automation is limited due to evaporation interference
Solution Approach 1:
The patent changes the physical parameter of the extraction medium from volatile organic solvents to non-volatile aqueous solutions. This eliminates evaporation interference during automated processing steps, allowing complete automation of the tacrolimus quantification assay without manual intervention for solvent handling or evaporation control.
3Ease of manufacture
If manual sample preparation procedures are used, then extraction can be performed, but labor intensity and time consumption increase
Solution Approach 1:
The patent merges multiple separate manual steps (denaturation, extraction, centrifugation, decantation) into a single automated liquid handling process using aqueous detergent solutions. This consolidation enables complete automation, dramatically increasing analytical throughput and eliminating manual labor while maintaining extraction capability.
4Measurement precision
If centrifugation and decantation steps are included, then separation of extracted sample is achieved, but process complexity increases
Solution Approach 1:
The patent extracts and removes the need for centrifugation and decantation steps by using aqueous detergent-based extraction that is compatible with automated liquid handling systems. The extraction process itself enables direct transfer of the supernatant without requiring separate separation steps, thereby reducing procedural complexity while maintaining sample separation 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
This method provides accurate and reproducible tacrolimus quantification with reduced costs and improved safety by eliminating manual handling and volatile solvents, achieving results comparable to traditional methods while ensuring automation and minimizing interference with the quantification process.
Implementation Method 1
In order to determine the presence of Tacrolimus and its concentration in a human blood sample, RBC's present in the sample must be lysed to release the tacrolimus/protein complexes
Implementation Method 2
A fully automated method using non-precipitating, non-denaturing aqueous solutions with bile salts or zwitterionic detergents like CHAPS to extract tacrolimus from blood samples
Data Source
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AI summary
The present invention relates to a method of extracting tacrolimus in a test blood sample to use in a tacrolimus quantification assay. The method of the present invention extracts tacrolimus in non-precipitating, non-denaturing aqueous environment, avoiding cumbersome manual pretreatment procedures or the use of organic solvents. The method of the present invention permits full automation of tacrolimus quantification assays.