Biodegradable Absorbent Articles With Salt-Activated Enzyme Breakdown
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Solution Overview
Problem
Petroleum-based plastics used in absorbent articles are difficult to recycle and take a long time to biodegrade, contributing to environmental waste accumulation, despite the potential of biopolymers like polyhydroxyalkanoates to biodegrade faster.
Innovation Solution
Incorporating inactivated microorganisms, such as Halobacillus and Pseudomonas aeruginosa, that secrete poly[R-3-hydroxybutyrate] depolymerase enzymes into biodegradable absorbent articles, which activate upon contact with salt-containing liquids to accelerate the degradation of polyhydroxyalkanoate polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biopolymers like polyhydroxyalkanoates are used to replace petroleum-based plastics, then biodegradation capability is improved, but biodegradation rate is insufficient in landfills and soil
Solution Approach 1:
The patent incorporates dormant microorganisms and enzymes into the biopolymer structure before disposal. These biological agents are prepared in advance and remain inactive until activated by salt-containing liquids in the environment, at which point they rapidly degrade the biopolymer. This preliminary preparation resolves the contradiction by ensuring both biodegradation capability (through inclusion of biological agents) and sufficient biodegradation rate (through rapid activation and action when conditions are met).
Solution Approach 2:
The patent uses salt-containing liquids as an intermediary trigger to activate the dormant microorganisms and enzymes. The salt concentration acts as a signal that initiates the biodegradation process. This intermediary mechanism resolves the contradiction by providing a reliable activation trigger that ensures biodegradation occurs at an adequate rate when the article enters the waste stream, while maintaining biodegradation capability through the presence of the activated biological agents.
2Ease of manufacture
If petroleum-based plastics are used in absorbent articles, then manufacturing and performance are established, but recyclability is poor and environmental waste accumulation increases
Solution Approach 1:
The patent changes the chemical composition parameter of the absorbent article by replacing petroleum-based plastics with biopolymers like polyhydroxyalkanoates. This parameter change maintains the manufacturing feasibility and performance characteristics while fundamentally altering the end-of-life behavior to enable biodegradation. The inclusion of dormant microorganisms and enzymes further modifies the degradation parameter to ensure adequate biodegradation rate, thereby reducing environmental waste accumulation while preserving ease of manufacture.
3Object-affected harmful factors
If biopolymers are used instead of petroleum-based plastics, then environmental biodegradation is improved, but significant time periods are still required for decomposition
Solution Approach 1:
The patent incorporates dormant microorganisms and enzymes into the biopolymer structure before disposal. These biological agents are prepared in advance and remain inactive until activated by salt-containing liquids in the environment, at which point they rapidly degrade the biopolymer. This preliminary preparation resolves the contradiction by ensuring both biodegradation capability (through inclusion of biological agents) and sufficient biodegradation rate (through rapid activation and action when conditions are met).
Solution Approach 2:
The patent employs a two-stage biodegradation process: a dormant preparation stage followed by an active degradation stage triggered by salt-containing liquids. This periodic action pattern allows the article to maintain stability during use and transport, then rapidly biodegrade when activated in the waste stream, significantly reducing the overall decomposition time while improving environmental biodegradation effectiveness.
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 degradation process is significantly accelerated, with the articles degrading 10 to 100 times faster than conventional articles, allowing for timely disposal and reducing environmental impact.
Implementation Method 1
The inactivated microorganism product is configured to activate upon contacting a salt containing liquid having a salt concentration of 50 millimolar (±10%) or greater, where the at least one type of microorganism produces an enzyme that degrades the polyhydroxyalkanoate polymer
Implementation Method 2
the at least one type of microorganism is salt tolerant from about 100 millimolar to about 3 molar
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
An auto-biodegradable absorbent article formed at least in part from a biodegradable polymer is provided that includes an inactivated microorganism product. The absorbent article contains one or more microorganisms that are designed to secrete an enzyme that degrades the biopolymer, which can be a polyhydroxybutyrate polymer. The microorganism can naturally secrete the enzyme or can be genetically modified to secrete the enzyme. The microorganisms or bacteria incorporated into the absorbent article are particularly selected based upon their salt tolerance and enzyme production at certain salt concentrations.