Metabolic Enzyme-Induced Micro-Nano Plastic Biodegradation
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Solution Overview
Problem
Micro-nano plastics are considered inert and non-biodegradable, posing environmental and health risks due to their accumulation in organisms and ecosystems, with existing methods lacking effective analytical tools for monitoring their degradation and fate.
Innovation Solution
A method involving the use of metabolic enzymes, specifically glutathione S-transferase, to degrade micro-nano plastics through a process that includes ball milling, dispersion in water, mixing with the enzyme, and incubation, followed by mass spectrometry analysis to characterize and quantify degradation products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metabolic enzymes are used to degrade micro-nano plastics, then biodegradation efficiency is improved, but the complexity of the degradation system increases
Solution Approach 1:
The patent introduces metabolic enzymes as intermediary substances that mediate the degradation of micro-nano plastics. The enzymes act as catalysts that facilitate the breakdown of plastic particles into smaller fragments and eventually into biodegradable compounds, thereby improving biodegradation efficiency without requiring complex industrial-scale treatment systems
Solution Approach 2:
The patent employs ball milling to physically alter the parameters of plastic particles (size, surface area, morphology) before enzymatic degradation. This pre-treatment changes the physical state of the plastics to make them more susceptible to enzymatic action, enhancing the overall biodegradation efficiency while keeping the process relatively simple
2Measurement precision
If mass spectrometry analysis is used to characterize degradation products, then measurement precision is improved, but the complexity of analysis operations increases
Solution Approach 1:
The patent extracts and isolates degradation products from the complex mixture generated during enzymatic degradation of micro-nano plastics. By separating the degradation products from the original plastic particles and other contaminants, the analysis focuses on specific compounds of interest, thereby improving measurement precision while managing operational complexity through targeted analysis
Solution Approach 2:
The patent uses MALDI-TOF MS with matrix-assisted laser desorption ionization to create a spectral fingerprint copy of the degradation products. This technique generates mass spectra that serve as characteristic copies of the molecular structure, enabling precise identification and quantification of degradation products without requiring complex multi-step analysis procedures
3Manufacturing precision
If ball milling is used to prepare plastic samples, then manufacturing precision is improved, but energy consumption increases
Solution Approach 1:
The patent applies ball milling as a preliminary treatment step before enzymatic degradation to achieve uniform particle size and increase surface area. This pre-processing action prepares the plastic samples in advance to enhance their susceptibility to enzymatic breakdown, improving manufacturing precision of particle characteristics while the energy input is justified by the subsequent enhanced biodegradation efficiency
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 efficiently degrades micro-nano plastics under mild conditions, identifying multiple degradation products and pathways, and enables high-sensitive, matrix-free mass spectrometry testing, simplifying operations and improving analysis efficiency and accuracy.
Implementation Method 1
mixing the micro-nano plastic dispersion with a metabolic enzyme solution... the metabolic enzyme includes glutathione S-transferase
Implementation Method 2
metabolic enzyme-induced micro-nano plastic particle biodegradation method... confirms that metabolic enzymes may induce the degradation of micro-nano plastics
Implementation Method 3
placing the plastic products in a ball mill tank and milling the plastic products in vacuum in a ball mill
Implementation Method 4
placing the mixed solution in a vortex oscillator for mixing well
Implementation Method 5
incubating the mixed solution in a waterproof incubator
Implementation Method 6
MALDI-TOF MS with soft ionization and wide mass range provides an effective tool for their characterization
Implementation Method 7
placing the target plate on a target holder of MALDI-TOF MS, and directly performing mass spectrometry test
Data Source
AI summary
A metabolic enzyme-induced micro-nano plastic particle biodegradation method and a product analysis method therefor are disclosed. The biodegradation method includes the following steps: step (1), cutting an appropriate quantity of plastic products into small pieces; step (2), placing the plastic products in a ball mill tank and milling the plastic products in vacuum in a ball mill; step (3), weighing and dispersing the milled plastic sample with water to prepare a dispersion with a concentration; step (4), mixing the micro-nano plastic dispersion with a metabolic enzyme solution, and placing the mixed solution in a vortex oscillator for mixing well; and step (5), incubating the mixed solution in a waterproof incubator. The present invention provides for the first time a method for biodegradation and metabolism of micro-nano plastics under mild conditions and under the induction of a metabolic enzyme, namely, glutathione S-transferase.