Continuous Peptide Synthesis Using Oil-Water Separation in Flow Reactors
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Solution Overview
Problem
Existing peptide synthesis methods, particularly the liquid phase method, face challenges with complex production steps, time-consuming operations, and difficulties in continuous production due to issues like clogging in flow reactors when using pseudo-solid-phase protecting groups, especially for long-chain peptides.
Innovation Solution
A method involving the use of a pseudo-solid-phase protecting group in a flow reactor, where peptide elongation and purification are performed in a continuous flow, utilizing oil-water separation to maintain solubility and easily remove contaminants, thereby avoiding clogging and simplifying the purification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid phase method is used for peptide synthesis, then reactivity and scalability are improved, but production steps become complicated and time-consuming due to repeated removal of residual reagents and by-products
Solution Approach 1:
A pseudo-solid-phase protecting group is introduced as an intermediary substance that temporarily protects the C-terminal carboxyl group during peptide synthesis. This protecting group enables the reaction to proceed in liquid phase while facilitating easy separation of by-products through solid-liquid separation, thus simplifying the production process without sacrificing reactivity
Solution Approach 2:
The protecting group undergoes phase transition from solid (insoluble in reaction solvent) to soluble form after deprotection. This phase transition mechanism allows for automatic separation of protected intermediates from the reaction mixture through simple filtration, eliminating the need for complex purification steps while maintaining liquid phase reaction conditions
2Productivity
If pseudo-solid-phase protecting group is used in flow reactor, then continuous production is enabled and purification is simplified, but clogging occurs especially for long-chain peptides
Solution Approach 1:
The molecular structure of the protecting group is optimized by adjusting parameters such as hydrocarbon chain length and aromatic ring substitution patterns. These structural modifications reduce the protecting group's tendency to aggregate and precipitate, thereby preventing clogging in flow reactors while maintaining its pseudo-solid-phase characteristics for easy separation
Solution Approach 2:
The protecting group is designed as a temporary, disposable functional element that is introduced, performs its protective function during synthesis, and is then removed. Its transient nature and optimized structure prevent accumulation and clogging in continuous flow systems, allowing for reliable continuous production
3Ease of manufacture
If solid phase method is used for peptide synthesis, then separation of reagents and by-products is simplified, but reactivity and scalability are limited due to surface reaction constraints
Solution Approach 1:
The solid-phase characteristics are segmented and applied only to the protecting group rather than the entire support matrix. This allows the peptide synthesis to occur in liquid phase with high reactivity and scalability, while the protecting group segment provides the solid-phase separation benefit through simple filtration of insoluble protected intermediates
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 approach allows for efficient, continuous synthesis and purification of peptides of various chain lengths without clogging, significantly reducing post-treatment time and simplifying the purification process.
Implementation Method 1
utilizing oil-water separation to maintain solubility and easily remove contaminants
Data Source
AI summary
Peptides may be continuously produced by a method including the following steps (1), (A), (2), and (B):(1) performing a condensation reaction in a flow reactor to obtain an N-protected C-protected peptide in which an N-terminal amino group and C-terminal are protected by protecting groups, a side chain functional group is optionally further protected by a protecting group, and at least one of the C-terminal or the side chain functional group is protected by a pseudo-solid-phase protecting group (N-protected C-protected peptide),(A) washing a reaction mixture containing an N-protected C-protected peptide in a flow reactor and separating oil and water to separate an organic layer containing the N-protected C-protected peptide,(2) subjecting an organic layer containing an N-protected C-protected peptide to a reaction to remove a protecting group of an N-terminal amino group in a flow reactor to obtain a C-protected peptide in which an N-terminal amino group is not protected, C-terminal is protected by a protecting group, a side chain functional group is optionally further protected by a protecting group, and at least one of the C-terminal or the side chain functional group is protected by a pseudo-solid-phase protecting group (N-unprotected C-protected peptide),(B) subjecting a reaction mixture containing an N-unprotected C-protected peptide to washing and oil-water separation in a flow reactor to separate an organic layer containing the N-unprotected C-protected peptide.