Cytidine Diphosphate Choline Purification Using pH-Controlled Ion Exchange
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Solution Overview
Problem
Current methods for purifying cytidine diphosphate choline (CDP-choline) fail to efficiently separate CDP-choline from nucleic acid analogues like uracil and UTP, particularly when using ion exchange resins, which limits the purification efficiency and cost-effectiveness.
Innovation Solution
A method involving a CDP-choline solution with a pH of 0.5 to 5.0 being contacted with an H-type strongly acidic cation exchange resin, followed by elution with a low-ion concentration aqueous solution, effectively separates and purifies CDP-choline by adsorbing it onto the resin while allowing nucleic acid analogues to be efficiently removed, using a biocatalyst such as a microorganism or enzyme to produce CDP-choline from UTP and choline or phosphorylcholine precursors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a strongly acidic ion exchange resin and a weakly basic ion exchange resin are used to purify CDP-choline, then CDP-choline can be separated from phosphorylcholine and CMP, but uracil and UTP cannot be separated efficiently
Solution Approach 1:
The patent changes the pH parameter of the solution to be in the range of 0.5 to 5.0, which optimizes the adsorption behavior of different nucleic acid analogues on the strongly acidic cation exchange resin. This pH control enables selective adsorption of CDP-choline while allowing uracil and UTP to remain in solution, achieving efficient separation that was not possible with conventional methods
Solution Approach 2:
The patent segments the purification process into distinct stages: first adjusting the pH to 0.5-5.0, then passing through the strongly acidic cation exchange resin, and finally eluting with water or low-ion concentration solution. This segmentation allows each nucleic acid analogue to be separated based on its specific adsorption characteristics at the controlled pH
2Manufacturing precision
If conventional ion exchange resin methods are used, then some separation can be achieved, but the purification process becomes complex and cost-effective
Solution Approach 1:
The patent extracts the pH adjustment step as a critical pre-treatment before the ion exchange process. By extracting and emphasizing this parameter control, the method simplifies the overall process design while achieving superior separation results, eliminating the need for complex multi-resin systems
Solution Approach 2:
Instead of using multiple types of ion exchange resins as conventionally done, the patent inverts the approach by using a single strongly acidic cation exchange resin with controlled pH conditions. This inversion simplifies the device complexity while maintaining or improving purification efficiency
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 allows for the low-cost production of high-purity CDP-choline and its salts by efficiently separating CDP-choline from nucleic acid analogues, achieving a significant reduction in impurities and improving the overall purification process.
Implementation Method 1
contacting a CDP-choline solution containing a nucleic acid analogue and having a pH of not less than 0.5 and not more than 5.0 with an H-type strongly acidic cation exchange resin
Implementation Method 2
a biocatalyst having an activity to produce CDP-choline from a precursor of UTP and choline or phosphorylcholine
Data Source
AI summary
A method of purifying cytidine diphosphate choline, which comprises contacting a cytidine diphosphate choline solution containing a nucleic acid analogue and having a pH of not less than 0.5 and not more than 5.0 with an H-type strongly acidic cation exchange resin, and eluting cytidine diphosphate choline adsorbed onto the resin with water or an aqueous solution having an ion concentration of not more than 0.1 mol/L to separate and purify the cytidine diphosphate choline.