Novel Polypeptide Enzyme for Polyester Degradation
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Solution Overview
Problem
Current methods for recycling polyester-containing plastics are inefficient and costly, particularly due to the limited ability of existing enzymes to degrade polyesters in film or pellet form, and the high energy requirements of mechanical and chemical recycling processes.
Innovation Solution
A novel polypeptide with polyester-degrading activity, isolated from Micromonospora bacteria, which can efficiently break down polyesters at lower temperatures, and an auxiliary polypeptide that optimizes the activity range of degrading enzymes, allowing for effective degradation of polyesters in various forms, including film and pellet forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical recycling processes are used to reprocess plastic material, then plastic can be recycled into new products, but huge amounts of electricity are consumed and equipment costs are high
Solution Approach 1:
The patent replaces mechanical recycling processes with an enzymatic system. The polypeptide enzyme catalyzes the hydrolysis of polyester bonds, breaking down plastic materials into monomers and oligomers through biochemical reactions rather than mechanical processing. This substitution eliminates the need for energy-intensive mechanical extrusion and processing equipment.
Solution Approach 2:
The patent changes the operating parameters from mechanical processing conditions to enzymatic reaction conditions. By using a polypeptide enzyme that functions effectively at lower temperatures and neutral to slightly alkaline pH, the process avoids the high energy consumption associated with mechanical recycling while maintaining effective degradation capability.
2Productivity
If chemical recycling processes are used to recover chemical constituents, then monomers can be recovered for re-manufacturing, but the process is expensive and non-competitive compared to virgin monomers
Solution Approach 1:
The patent replaces expensive chemical recycling processes with a biological enzymatic system. The polypeptide enzyme facilitates hydrolysis under mild conditions, producing monomers and oligomers that can be recovered and reused. This biological approach is less expensive than chemical methods while maintaining effective monomer recovery.
Solution Approach 2:
The enzymatic system enables self-service degradation and monomer recovery. The polypeptide enzyme catalyzes the breakdown of polyester bonds, and the resulting monomers and oligomers are directly available for re-manufacturing without requiring complex chemical processing steps. This self-service approach reduces overall process costs.
3Adaptability or versatility
If existing polypeptides are used for polyester degradation, then degradation can occur, but the polypeptides show poor degrading ability and only work on polymer in emulsion form
Solution Approach 1:
The patent modifies the enzyme's operational parameters to achieve superior performance. The new polypeptide is engineered or selected to function effectively on solid polyester substrates in film or pellet form, not just emulsion form. The enzyme displays enhanced catalytic activity and substrate binding affinity, enabling direct degradation of solid plastics at practical rates.
Solution Approach 2:
The patent creates a composite enzymatic system that combines the polypeptide enzyme with appropriate carriers or supports to enhance its capability. This composite approach allows the enzyme to effectively degrade solid polyester substrates while maintaining stability and activity, overcoming the limitations of previous polypeptide systems.
4Productivity
If existing polypeptides are used for polyester degradation, then degradation can occur at elevated temperature, but the process cost increases due to thermal degradation requirements
Solution Approach 1:
The patent changes the temperature parameter of the degradation process. The new polypeptide enzyme is designed to function optimally at lower temperatures, eliminating the need for thermal degradation conditions. This temperature reduction decreases process costs while maintaining effective degradation activity through enhanced enzymatic catalysis at ambient or mildly elevated temperatures.
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 novel polypeptide enables efficient degradation of polyesters at lower temperatures, reducing energy costs and improving the recycling efficiency of polyester-containing materials, making the process more economically viable and environmentally friendly.
Implementation Method 1
enzymes can accelerate hydrolysis of plastics
Implementation Method 2
enzymatic degradation is looked as an ideal waste treatment method because enzymes can accelerate hydrolysis of plastics
Data Source
AI summary
The present invention relates to a new isolated polypeptide comprising an amino acid sequence having at least 75%, 80%, 85%, 90%, 95%, 99% or 100% identity to the full length amino acid sequence set forth in SEQ ID NO:1, and having a polyester degrading activity, and uses thereof.