Plecanatide Fragment Coupling and Buffer-Based Purification
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Solution Overview
Problem
Existing methods for synthesizing and purifying Plecanatide are inefficient, costly, and result in high impurity content, lacking robustness and purity.
Innovation Solution
A process involving the coupling of peptide fragments in both solid and solution phases, followed by specific purification steps using Tris hydrochloride and acetonitrile or Triethylammonium phosphate buffers in preparative HPLC, achieving high purity (>99%) and reducing impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional purification methods (preparative C18-HPLC with TFA buffers) are used, then Plecanatide can be purified, but the process is complex and costly with lower purity outcomes
Solution Approach 1:
The patent changes the buffer system parameters from traditional TFA-based buffers to Tris hydrochloride and Triethylammonium phosphate buffers at controlled pH levels (6.5-7.5). This parameter change in the purification medium enables superior separation of Plecanatide from impurities while simplifying the overall process and achieving >99% purity
Solution Approach 2:
The patent employs cost-effective buffer systems (Tris hydrochloride and Triethylammonium phosphate) that are simpler and less expensive than traditional TFA-based buffers. These buffers provide adequate purification performance without the complexity and cost associated with conventional methods, making the process more economically viable
2Ease of manufacture
If traditional synthesis and purification protocols are followed, then Plecanatide can be produced, but the process is costly and results in impurity content
Solution Approach 1:
The patent performs preliminary purification steps using the optimized Tris/Triethylammonium phosphate buffer system before final product isolation. This preliminary action removes impurities early in the process, preventing their carryover into the final product and eliminating the need for multiple costly purification cycles
Solution Approach 2:
The patent converts the challenge of impurity removal into a benefit by using the specific pH properties of Tris and Triethylammonium phosphate buffers. These buffers create optimal conditions for selective retention and elution of Plecanatide, turning the purification challenge into an efficient separation process that simultaneously removes impurities and isolates the pure product
3Reliability
If conventional HPLC buffer systems are used, then purification can be achieved, but the process lacks robustness and high purity
Solution Approach 1:
The patent employs buffer systems (Tris hydrochloride and Triethylammonium phosphate) that serve multiple functions: they provide optimal pH control for peptide stability, enable selective chromatographic separation, and facilitate efficient elution. This multi-functionality enhances process robustness while simultaneously achieving >99% purity in a single purification step
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 achieves high purity (>99%) Plecanatide with reduced impurities, ensuring a cost-effective and robust synthesis method.
Implementation Method 1
purification on preparative HPLC column with Tris hydrochloride (buffer A) and acetonitrile (buffer B)
Implementation Method 2
oxidizing the linear 1-16 peptide to obtain Plecanatide
Data Source
AI summary
The present invention relates to a process for the preparation of Plecanatide, which comprises preparation of three fragments such as Fragment A (7 amino acids). Fragment B (3 amino acids). Fragment D (6 amino acids) and coupling the fragments to provide Plecanatide followed by purification using buffer system comprising Tris hydrochloride (or) Triethylammonium phosphate.