Sofia Martinez
Plastic is a threat to the environment due to its slow degradation, which can take decades. Synthetic plastics are particularly harmful, and their biodegradation is a slow process influenced by environmental factors and wild microbial species. Fungi play a crucial role in breaking down these synthetic polymers by secreting degrading enzymes. This process improves the hydrophilicity of polymers, facilitating their degradation. Recent studies have identified several fungal strains capable of biodegrading synthetic plastics, including polyethylene and polypropylene. These findings offer hope for developing disruptive recycling technologies to enhance plastic circularity. While the specific biochemical processes remain unknown, the potential of fungi in plastic degradation is undeniable, and further research aims to enhance efficiency and develop small-scale prototypes.
| Characteristics | Values |
|---|---|
| Fungi plastic | Biodegradation of plastic polymers by fungi |
| Plastic polymers | Non-degradable solid wastes |
| Synthetic plastics | A slow process involving environmental factors and wild microbial species |
| Fungi | Play a pivotal role in plastic biodegradation by secreting degrading enzymes |
| Synthetic plastics | Polyethylene constitutes 64% of total synthetic plastics |
| Polyethylene | Used for manufacturing bottles, carry bags, disposable articles, garbage containers, etc. |
| Annual global usage of polythene | 500 billion to 1 trillion polythene bags |
| Increase in polythene usage | 12% per annum |
| Annual global production of synthetic plastic polymers | Approximately 140 million tonnes |
| Fungal species that degrade high molecular weight polyethylene | Phanerochaete chrysosporium |
| Polypropylene | A hard-to-recycle plastic that has been successfully biodegraded by two strains of fungi |
| Strains of fungi that can degrade polypropylene | Aspergillus terreus and Engyodontium album |
| Biodegradation of synthetic and natural plastic | Demonstrated by microorganisms |
| Fungal strains | Able to attach to and colonize different plastic polymers without pretreatment |
| Strains of fungi with high bioremediation potential | Fusarium, Penicillium, Botryotinia, Trichoderma |
| Bio-based plastics | Only about half are biodegradable |
| Plastic-degrading microbes | Over 400 records, including over 200 records of plastic-degrading fungi species |
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What You'll Learn
- Fungi can break down plastic polymers into simpler molecules
- The biodegradation process is eco-friendly, non-polluting, and cost-effective
- Some fungi can degrade 'forever chemicals' like PFAS
- Strains of Fusarium, Penicillium, Botryotinia, and Trichoderma can degrade plastic
- Polypropylene, a hard-to-recycle plastic, was broken down by two strains of fungi
Fungi can break down plastic polymers into simpler molecules
Plastic polymers are non-degradable solid wastes that pose a significant threat to the environment. They are often resistant to microbial degradation and can persist in the environment for decades. However, fungi have emerged as promising agents for the bioremediation of plastic polymers.
Fungi possess the unique ability to break down complex polymers into simpler molecules. This capability is attributed to their production of powerful enzymes, which they excrete to decompose substrates into smaller molecules that can be absorbed by fungal cells. This process, known as biodegradation, is considered the most effective and environmentally friendly method for plastic degradation due to its non-polluting, eco-friendly, and cost-effective nature.
During biodegradation, fungi secrete degrading enzymes such as cutinase, lipase, proteases, lignocellulolytic enzymes, and pro-oxidant ions. These enzymes facilitate the oxidation or hydrolysis of polymers, enhancing their hydrophilicity and leading to the degradation of high molecular weight polymers into low molecular weight compounds. This breakdown is essential as high molecular weight polymers cannot be transported across the cellular membrane of fungi, so they must be depolymerized into smaller monomers.
Several fungal strains have demonstrated exceptional potential in degrading different types of plastic polymers. Strains of Fusarium, Penicillium, Botryotinia, and Trichoderma have shown high bioremediation capabilities for polyurethane (PU), polyethylene (PE), and rubber. Additionally, Aspergillus terreus and Engyodontium album, two common strains of fungi, successfully biodegraded polypropylene, a challenging plastic to recycle, reducing it by 21-27% over 30 to 90 days.
While the specific biochemical processes involved in plastic degradation by fungi require further research, the potential of fungi in breaking down plastic polymers into simpler molecules offers promising solutions for addressing the global issue of plastic waste.
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The biodegradation process is eco-friendly, non-polluting, and cost-effective
Plastic polymers are non-degradable solid wastes that pose a significant threat to the environment. The degradation of plastics would take a few decades, and their increasing leakage into the environment poses a threat to environmental, animal, and human health.
Fungi play a pivotal role in the biodegradation of plastics. They act on plastics by secreting degrading enzymes, such as cutinase, lipase, and proteases, and lignocellulolytic enzymes. The presence of some pro-oxidant ions can also cause effective degradation. The oxidation or hydrolysis by the enzyme creates functional groups that improve the hydrophilicity of polymers, and consequently degrade the high molecular weight polymer into low molecular weight. This process is initiated by microorganisms, such as bacteria and fungi, which attach to the plastic film and inject enzymes, growing on it by utilizing it as a substrate and source of nutrition. The polymers slowly get depolymerized, and the degradation is compiled by a mineralization process, where H2O (water), CO2 (carbon dioxide), and CH2 (methane) are end products.
Fungi can also produce surface-active proteins, such as hydrophobins, to coat hyphae to hydrophobic substrates. The growth of many fungi can cause small-scale swelling and bursting as they penetrate the polymer solids. The degradation of plastics by fungi occurs through intracellular and extracellular enzymatic systems.
Compared to other degradation processes, the biodegradation of plastics is the most effective and ideal method due to its non-polluting mechanism, eco-friendly nature, and cost-effectiveness. It is a slow process that involves environmental factors and the action of wild microbial species. Additionally, the ability of fungi to use synthetic polymers as their primary or only source of energy further highlights the eco-friendly nature of the biodegradation process.
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Some fungi can degrade 'forever chemicals' like PFAS
Fungi are being studied for their potential to biodegrade plastics. They have been shown to be able to degrade complex polymers and are considered good candidates for bioremediation (biological pollutant reduction) of plastics. Some strains of fungi, such as Fusarium, Penicillium, Botryotinia, and Trichoderma, have demonstrated a high potential to degrade polyurethane (PU), polyethylene (PE), and tire rubber.
Fungi have also been found to degrade "forever chemicals" like PFAS (per- and polyfluoroalkyl substances). PFAS are synthetic fluoroorganic compounds that are extremely difficult to degrade due to the strength of the carbon-fluorine bond. They are pervasive in the environment and have been linked to adverse health effects in humans and wildlife. While the process of fungal degradation of PFAS is slow and not yet fully understood, studies have shown that certain types of fungi, such as white rot fungus and edible mushrooms, have the potential to break down these compounds.
One approach to PFAS remediation combines plants and fungi in constructed wetland technology. In one study, an abundant and renewable component of dry plant matter called lignocellulose was used to create a porous framework called Renewable Artificial Plant for In-Situ Microbial Environmental Remediation (RAPIMER). The fungus grows on this framework and degrades the PFAS adsorbed by the plant material. This method has been shown to successfully remove more than 98% and 99% of PFOA and PFOS, respectively, in a two-week period.
Another study investigated the uptake of PFAS in edible mushrooms (Agaricus spp.) grown in a polluted substrate. The accumulation of PFAS in mushrooms was found to be low and dependent on the chain length of the PFAS. While the mushrooms did not completely degrade the PFAS, they have potential as a mycoremediation tool due to their ability to absorb and remediate different types of pollutants.
Overall, while the process is still being studied and optimized, some fungi have shown promise in degrading PFAS, providing a potential solution to address the environmental and health concerns associated with these "forever chemicals."
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Strains of Fusarium, Penicillium, Botryotinia, and Trichoderma can degrade plastic
Plastic polymers are non-degradable solid wastes that pose a significant threat to the environment. They are often resistant to microbial degradation and can persist in the environment for decades. This has spurred research into finding sustainable ways to treat plastic waste, with a focus on the potential of fungi to break down these complex polymers.
Fungi have been shown to effectively degrade plastic polymers, and certain strains possess a high potential for bioremediation. Notably, strains of Fusarium, Penicillium, Botryotinia, and Trichoderma have demonstrated a remarkable ability to degrade plastics. These fungi can colonize and break down various plastic polymers, including polyurethane (PU), polyethylene (PE), and tyre rubber, without the need for any pretreatment of the plastics.
The degradation process involves the secretion of degrading enzymes by the fungi. These enzymes, such as cutinase, lipase, proteases, and lignocellulolytic enzymes, facilitate the breakdown of the complex polymer structures. The production of these enzymes is a "superpower" of fungi, enabling them to break down a wide range of substrates. This versatility allows them to target man-made materials, such as plastics, and convert them into simpler molecules that can be absorbed by fungal cells.
The ability of these fungal strains to degrade plastics offers promising prospects for bioremediation and the reduction of plastic pollution. By utilizing their degradative capabilities, we can explore sustainable solutions to address the global issue of plastic waste accumulation and its detrimental impact on the environment, animal health, and human health.
Further research is being conducted to enhance the efficiency of plastic degradation by fungi and to understand the underlying biochemical processes. This includes exploring the role of biological processes and naturally occurring conditions that can accelerate plastic degradation, with the ultimate goal of developing innovative recycling technologies driven by fungal bioremediation.
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Polypropylene, a hard-to-recycle plastic, was broken down by two strains of fungi
Plastic polymers are non-degradable solid wastes that pose a significant threat to the environment. They are often resistant to microbial degradation and can persist in the environment for extended periods, ranging from tens to hundreds of years. This has led to a growing interest in exploring alternative methods for their degradation, such as biodegradation by fungi.
Polypropylene is a commonly used plastic that accounts for approximately 28% of the world's plastic waste. However, it has a very low recycling rate, with only about 1% of polypropylene being recycled. This is attributed to its short life as a packaging material and its tendency to become contaminated by other materials and plastics. As a result, polypropylene has long been a challenging puzzle for the recycling industry.
In a recent experiment conducted by researchers at the University of Sydney, two common strains of fungi, Aspergillus terreus and Engyodontium album, were found to successfully biodegrade polypropylene. These fungi, typically found in soil and plants, were able to break down polypropylene after it was pre-treated with either UV light or heat. The validity of the biodeterioration was confirmed through microscopy techniques. The treatment with UV light or heat, along with the action of the fungi, resulted in a reduction of plastic by 21% over 30 days and 25-27% over 90 days.
The ability of these fungal strains to break down polypropylene offers a promising solution to the challenge of recycling this hard-to-recycle plastic. The researchers plan to further explore the role of biological processes offered by fungi and other microorganisms in degrading plastics. They aim to enhance the efficiency of degrading polypropylene and develop a small-scale pilot prototype for commercialisation.
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Frequently asked questions
Fungi play a pivotal role in plastic biodegradation by secreting degrading enzymes like cutinase, lipase, and proteases, and producing pro-oxidant ions that effectively break down plastic polymers.
Fungi produce powerful enzymes that break down complex polymers into simpler molecules that the fungal cells can absorb. This ability to break down polymers is why fungi can grow on man-made materials.
Fungi have been shown to degrade polyurethane (PU), polyethylene (PE), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polypropylene, and tire rubber.
The rate of biodegradation varies. In one study, over 90% of oxygen was consumed in less than 14 days, with 300-500 ppm of CO2 generated. However, the process can be slow, and the specific conditions that accelerate degradation are still unknown.
Yes, fungi can break down synthetic polymers. Synthetic plastics like polyethylene and polypropylene are among the plastic types degraded by fungi.
