Bioplastic Extraction Using Bacillus pumilus Lytic Enzymes
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Solution Overview
Problem
Current methods for extracting bioplastics from microbial cells are costly and environmentally impactful due to the use of chemicals like organic solvents, detergents, acid, and alkali, and often result in low-purity products with inefficient processes.
Innovation Solution
A bio-based process using Bacillus pumilus bacterial cells to lyse bioplastic-producing microbial cells without chemicals, followed by depolymerization using microbial cells producing thermostable extracellular PHA depolymerase to obtain high-purity monomers and biopolymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical extraction methods (organic solvents, detergents, acid, alkali) are used to extract bioplastic from microbial cells, then extraction efficiency is improved, but environmental impact increases and cost increases
Solution Approach 1:
The patent uses lytic enzymes (cell wall degrading enzymes) as intermediary substances to break down the microbial cell walls and release bioplastic granules. These enzymes act as mediators between the extraction process and the cellular structure, enabling chemical-free extraction while maintaining efficiency and reducing environmental impact compared to direct chemical methods.
2Productivity
If chemical extraction methods are used to extract bioplastic from microbial cells, then extraction efficiency is improved, but production cost increases
Solution Approach 1:
The patent employs lytic enzymes that can be produced by microorganisms themselves, creating a self-service system where the extracting agents are generated through biological processes rather than requiring expensive chemical purchases and handling infrastructure. This biological self-service approach reduces production costs while maintaining extraction efficiency.
3Quantity of substance
If drying and grinding steps are used in extraction process, then bioplastic can be recovered, but processing time increases and product purity decreases
Solution Approach 1:
The patent replaces the mechanical drying and grinding system with a biochemical system using lytic enzymes. Instead of mechanically breaking down cells through drying and grinding, the enzymes chemically degrade the cell wall components, directly releasing the bioplastic granules in a liquid medium, thereby eliminating time-consuming mechanical steps while improving product purity.
4Quantity of substance
If mechanical drying and grinding steps are used in extraction process, then bioplastic can be recovered, but product purity decreases
Solution Approach 1:
The lytic enzymes serve as selective intermediaries that specifically target and degrade cell wall components without affecting the bioplastic granules. This selective action allows for high-purity bioplastic recovery, as the enzymes break down only the unwanted cellular material while leaving the bioplastic intact, unlike mechanical methods that co-process both desired and unwanted materials.
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 method achieves chemical-free, cost-efficient extraction and depolymerization of bioplastics, producing high-purity biopolymers and monomers with minimal environmental impact, suitable for various industrial and medical applications.
Implementation Method 1
extracting the bioplastic by admixing the bioplastic-producing microbial cells of step A and the bacterial cells of step B and allowing reaction without interacting with or consuming bioplastic from the bioplastic-producing microbial cells
Implementation Method 2
depolymerization using microbial cells producing thermostable extracellular PHA depolymerase to obtain high-purity monomers and biopolymers
Data Source
Figure 1
Figure 2A~2B
Figure 3(A)~3(C)
AI summary
The present invention relates to a process for extraction of bioplastic from bioplastic-producing microbial cells, comprising the steps of: A. providing bioplastic producing microbial cells comprising bioplastic; B. providing bacterial cells selected from the species Bacillus pumilus; C. extracting the bioplastic by admixing the bioplastic-producing microbial cells of step A and the bacterial cells of step B and allowing reaction. The present invention further relates to the process of producing monomers from said bioplastics by depolymerization.