Ultrapure Thiostrepton Preparation Through Staged Solvent Purification
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Solution Overview
Problem
Current methods of making and purifying thiostrepton result in material with undesirable impurities and excess residual solvent, making it unsuitable for human use.
Innovation Solution
A multi-step process involving dissolution, solvent distillation, solvent combination for precipitation, and solvent washing to produce ultrapure thiostrepton with less than 3000 ppm methanol, 600 ppm dichloromethane, 60 ppm chloroform, and 410 ppm acetonitrile, achieving greater than 98% purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current methods of making and purifying thiostrepton are used, then production is achieved, but the material contains undesirable impurities and excess residual solvent making it unsuitable for human use
Solution Approach 1:
The purification process is divided into multiple sequential steps: dissolution in first solvent, distillation to remove solvent impurities, combination with second solvent for precipitation, washing with third solvent, and drying. Each step targets specific impurities or solvent residues, segmenting the overall purification challenge into manageable stages that collectively achieve >98% purity with controlled residual solvent levels
Solution Approach 2:
The process utilizes changes in solvent properties and conditions at each step: dissolving in a first solvent suitable for thiostrepton solubility, then distilling to change solvent composition, adding a second solvent to change solubility parameters for precipitation, washing with a third solvent to remove remaining impurities, and drying to remove residual solvents. These parameter changes enable systematic purification to achieve the required purity level
2Manufacturing precision
If multiple purification steps are implemented to achieve high purity, then impurity levels are reduced, but the process complexity increases
Solution Approach 1:
The complex purification requirement is segmented into five distinct operational steps, each with a specific function: dissolution, distillation, precipitation, washing, and drying. This segmentation allows each step to be optimized independently while collectively achieving the overall purity goal, making the complex process more manageable and controllable
Solution Approach 2:
Multiple solvents act as intermediaries in the purification process: the first solvent dissolves thiostrepton, the second solvent induces precipitation, and the third solvent washes away impurities. These intermediary substances enable the transfer and separation of thiostrepton from various types of impurities and residual solvents through controlled solubility 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
The process yields thiostrepton with high purity, suitable for pharmaceutical use, reducing impurities and residual solvent levels to meet stringent quality standards.
Implementation Method 1
dissolving thiostrepton in a first solvent to generate a first thiostrepton solution
Implementation Method 2
distilling solvent impurities from the first thiostrepton solution to generate a second thiostrepton solution
Implementation Method 3
combining a second solvent with the second thiostrepton solution to precipitate thiostrepton and thus generate a first thiostrepton solid
Implementation Method 4
washing the first thiostrepton solid with a third solvent to remove impurities and thus generate a second thiostrepton solid
Implementation Method 5
drying the second thiostrepton solid to remove residual solvent
Data Source
AI summary
Disclosed are ultrapure preparations of thiostrepton, pharmaceutical composition comprising such preparations, as well as methods of preparing such preparations.