Polypeptide Polymer Coupling with Controlled Michael Addition
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Solution Overview
Problem
Conventional methods for introducing functional groups into polypeptides using Michael addition reactions face challenges such as unpredictable polymer compound formation, low raw material conversion ratios, and difficulty in controlling reaction conditions, leading to inefficiencies in producing polymer compounds suitable for industrial applications.
Innovation Solution
A polymer compound production method involving a heating reaction of a polypeptide with compounds like polyether or polycarbonate in dimethyl sulfoxide, using a base and reducing agent to promote the Michael addition reaction while inhibiting disulfide bond formation, thereby enhancing reaction efficiency and raw material conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a maleimide group is used as the Michael addition receptor to introduce functional groups into polypeptide, then various functional groups can be introduced, but the reaction system becomes difficult to control due to high reactivity, leading to unexpected polymer compound formation, increased viscosity, and decreased raw material conversion ratio
Solution Approach 1:
The patent introduces a base (such as triethylamine or diisopropylethylamine) as an intermediary substance to mediate the Michael addition reaction between mercapto groups and maleimide groups. The base facilitates the reaction by deprotonating the mercapto group to enhance its nucleophilicity, while also buffering the reaction system to prevent uncontrolled polymerization and maintain controllable reaction conditions.
Solution Approach 2:
The patent optimizes reaction parameters including maintaining a specific pH range (7-9) through base addition, controlling reaction temperature (25-60°C), and adjusting the molar ratio of reactants. These parameter changes enable better control over the reaction system while maintaining high functional group introduction efficiency and improving raw material conversion ratio.
2Productivity
If heating is applied to promote the Michael addition reaction, then reaction efficiency increases, but disulfide bond formation between mercapto groups is promoted, reducing the desired polymer compound production
Solution Approach 1:
The base acts as a mediator that enables the Michael addition reaction to proceed efficiently at lower temperatures (25-60°C) without requiring harsh heating conditions. By catalyzing the reaction through deprotonation, the base allows the desired reaction pathway to dominate, suppressing competing disulfide bond formation that would otherwise occur at higher temperatures.
Solution Approach 2:
The patent changes the temperature parameter from conventional high-temperature heating to a moderate range (25-60°C), combined with pH control through base addition. This parameter change shifts the reaction selectivity toward the desired Michael addition product while minimizing unwanted disulfide bond formation, thereby improving both productivity and reliability.
3Manufacturing precision
If reaction conditions are strictly controlled to prevent unwanted polymerization, then product quality improves, but production time and process complexity increase
Solution Approach 1:
The base serves as a controlling intermediary that simultaneously achieves multiple objectives: it promotes the desired Michael addition reaction, buffers the pH to prevent uncontrolled polymerization, and allows the reaction to proceed at moderate temperatures. This single intermediary substance simplifies the control strategy while maintaining high product quality.
Solution Approach 2:
The base performs multiple functions simultaneously: it acts as a catalyst for the Michael addition, a pH buffer to control reaction conditions, and a means to suppress unwanted side reactions. This multi-functionality reduces the number of separate control steps needed, thereby improving manufacturing precision without significantly increasing production time or process complexity.
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 method significantly increases the raw material conversion ratio and produces polymer compounds with improved mechanical properties, such as high elongation and breaking strength, suitable for applications in films and fibers.
Implementation Method 1
a Michael addition reaction between a mercapto group of cysteine constituting a polypeptide skeleton and a carbon-carbon double bond of maleimide or a maleic acid derivative
Implementation Method 2
formation of a disulfide bond between mercapto groups of the polypeptide is promoted by heating
Implementation Method 3
subjecting a polypeptide having at least one mercapto group and at least one compound selected from the group consisting of a polyether, a polyester, and a polycarbonate to a heating reaction in dimethyl sulfoxide
Implementation Method 4
subjecting a polypeptide having at least one mercapto group and at least one compound selected from the group consisting of a polyether, a polyester, and a polycarbonate to a heating reaction
Data Source
AI summary
One aspect of the present disclosure provides a polymer compound production method including subjecting a polypeptide having at least one mercapto group and at least one compound selected from the group consisting of a polyether, a polyester, and a polycarbonate and having two structures represented by the following general formula (1) to a heating reaction in dimethyl sulfoxide in the presence of a base and a reducing agent. [In general formula (1), M represents any one of H, Na, K, NHEt3, and NHEtiPr2]