Glucagon Fragment Coupling Process for Higher Purity and Yield
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Solution Overview
Problem
Existing methods for glucagon synthesis are characterized by numerous synthetic steps, long synthesis cycles, low purity, low yield, and high production costs, making them unsuitable for large-scale production.
Innovation Solution
A process involving solid phase peptide synthesis that includes coupling appropriate fragments in a specific sequence, followed by deprotection and purification using RP-HPLC, to obtain pure glucagon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional liquid phase peptide synthesis methods are used for glucagon preparation, then the synthesis can be performed with standard procedures, but the process requires numerous synthetic steps, long synthesis cycles, and results in low purity and yield
Solution Approach 1:
The glucagon peptide is divided into two fragments (aa 1-6 and aa 7-29) that are synthesized separately using solid phase peptide synthesis, then coupled together. This segmentation allows parallel synthesis of fragments, reducing overall synthesis time while maintaining high purity through controlled coupling conditions
Solution Approach 2:
A solid phase support (resin) is used as an intermediary carrier during peptide synthesis. The resin allows for easy washing of excess reagents and solvents, simplifies purification steps, and enables automated synthesis, thereby reducing synthesis time and improving purity without requiring numerous manual purification steps
2Reliability
If conventional peptide synthesis methods with multiple protection and deprotection steps are used, then complete peptide assembly can be achieved, but the number of synthetic steps increases and production cost rises
Solution Approach 1:
Amino acids are pre-protected with appropriate protecting groups (Fmoc or Boc) before incorporation into the peptide chain. This preliminary protection strategy ensures that side chains remain inert during synthesis, allowing for reliable peptide assembly without requiring repeated protection/deprotection cycles, thus reducing the total number of synthetic steps
Solution Approach 2:
The final deprotection step is extracted and performed separately after the peptide assembly is complete on the solid phase support. This allows all coupling and assembly steps to proceed with protecting groups in place, simplifying the overall process by consolidating deprotection to a single final step rather than requiring multiple intermediate deprotection cycles
3Manufacturing precision
If traditional purification methods are used after peptide synthesis, then crude peptide can be obtained, but the purity is low and requires extensive purification steps
Solution Approach 1:
The solid phase support acts as an intermediary that facilitates purification during synthesis. Excess reagents and byproducts can be simply washed away from the resin-bound peptide, achieving high purity at each synthesis stage. This eliminates the need for extensive post-synthesis purification steps and minimizes yield loss
Solution Approach 2:
By dividing the peptide into fragments that are synthesized and purified separately before coupling, each fragment can be purified to high purity independently. The final coupling step produces the complete glucagon peptide with high overall purity, reducing the need for extensive re-purification and minimizing yield loss during purification
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 significantly reduces synthesis steps, enhances purity, and increases yield, making it suitable for large-scale production of glucagon.
Implementation Method 1
condensing a fragment-1 with a fragment-2 in the presence of coupling agent to obtain protected glucagon
Implementation Method 2
deprotecting the protected glucagon with a cocktail mixture to afford crude glucagon
Implementation Method 3
purifying by RP-HPLC to isolate pure glucagon
Data Source
AI summary
The present invention relates to a process for preparation of glucagon comprising condensing a fragment-1 (24 mer providing amino acid residues 6-29 of glucagon) with a fragment-2 (5-mer providing amino acid residues 1-5 of glucagon) in the presence of a coupling agent to obtain a protected glucagon, deprotecting the protected glucagon with a cocktail mixture to afford crude glucagon followed by RP-HPLC purification to isolate pure glucagon.