Lithium Salt Precipitation for High-Purity Protected Peptides
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Solution Overview
Problem
Existing methods struggle to achieve high-purity purification of salts of amino acids and peptide compounds due to the presence of impurities such as β-alanine and its derivatives, which are difficult to remove effectively.
Innovation Solution
A method involving the use of a lithium-containing substance to precipitate a lithium salt of the purification target, which includes amino acids or peptide compounds with protective groups at the N terminus, thereby separating and removing impurities through a lithium salt formation and precipitation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods are used to remove impurities such as β-alanine, then the purification process becomes complex and time-consuming, but the purity of the amino acid salt cannot be effectively improved
Solution Approach 1:
The invention changes the chemical parameter by converting the amino acid salt to a lithium salt form, which has different solubility characteristics. This parameter change enables selective precipitation of the lithium salt while leaving impurities like β-alanine in solution, achieving high purity without complex purification steps
Solution Approach 2:
The invention utilizes phase transition by precipitating the lithium salt from the aqueous solution through controlled crystallization. The lithium salt transitions from dissolved state to solid crystalline form, while impurities remain in the liquid phase, enabling effective separation and purification
2Manufacturing precision
If conventional purification methods are used to remove impurities such as β-alanine, then the purification process becomes time-consuming, but the purity of the amino acid salt cannot be effectively improved
Solution Approach 1:
By changing the salt form to lithium salt, the invention creates a system where purification occurs through simple precipitation rather than multiple sequential purification steps. This parameter change dramatically reduces the time required while achieving the desired high purity level
Solution Approach 2:
The invention extracts the purification function into a single step by forming the lithium salt, which naturally separates from impurities through precipitation. This extraction of the purification mechanism into a focused chemical transformation eliminates the need for time-consuming conventional purification sequences
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 achieves high-purity salts of amino acids and peptide compounds by effectively reducing the content of impurities to 5% or less, enhancing their suitability for use in drug discovery and synthetic intermediates.
Implementation Method 1
a step of contacting a lithium-containing substance with a mixture to be purified which is a mixture of the following purification target (i) and the following impurities (ii): (i) the amino acid having a protective group at the N terminus or the peptide compound having a protective group at the N terminus
Implementation Method 2
a step of precipitating a lithium salt of the purification target
Data Source
AI summary
One aspect of the present invention relates to a method for producing a salt of an amino acid or a salt of a peptide compound or a solvate thereof, comprising the following steps (A) and (B): step (A); a step of contacting a lithium-containing substance with a mixture to be purified which is a mixture of the following purification target (i) and the following impurities (ii): (i) the amino acid having a protective group at the N terminus or the peptide compound having a protective group at the N terminus, and (ii) compounds other than the purification target, and step (B); a step of precipitating a lithium salt of the purification target.