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Nature-Inspired Breakthrough: Artificial “Worm Gut” Devours Plastic Waste

March 13, 2024
in Science
Nature-Inspired Breakthrough: Artificial “Worm Gut” Devours Plastic Waste
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Scientists Develop Artificial ‘Worm Gut’ To Break Down Plastics

The NTU scientists fed the worms with different plastic diets and extracted the microbiomes from their gut, incubating them in flasks to form an artificial ‘worm gut’. Credit: NTU Singapore

A group of researchers at Nanyang Technological University, Singapore (NTU Singapore), has created a artificial ‘worm gut’ capable of decomposing plastics. This innovation presents a promising nature-inspired solution for addressing the worldwide issue of plastic pollution.

By feeding worms with plastics and cultivating microbes found in their guts, researchers from NTU’s School of Civil and Environmental Engineering (CEE) and Singapore Centre for Environmental Life Sciences Engineering (SCELSE) have demonstrated a new method to accelerate plastic biodegradation.

Previous studies have shown that Zophobas atratus worms – the larvae of the darkling beetle commonly sold as pet food and known as ‘superworms’ for their nutritional value – can survive on a diet of plastic because its gut contains bacteria capable of breaking down common types of plastic. However, their use in plastics processing has been impractical due to the slow rate of feeding and worm maintenance.

NTU scientists have now demonstrated a way to overcome these challenges by isolating the worm’s gut bacteria and using them to do the job without the need for large-scale worm breeding.

Sakcham Bairoliya, Cao Bin and Liu Yinan

(L-R) Members of the NTU research team include Dr Sakcham Bairoliya, Research Fellow; Associate Professor Cao Bin; and Dr Liu Yinan, Research Fellow. Credit: NTU Singapore

NTU Associate Professor Cao Bin at the School of CEE and Principal Investigator at SCELSE said, “A single worm can only consume about a couple of milligrams of plastic in its lifetime, so imagine the number of worms that would be needed if we were to rely on them to process our plastic waste. Our method eliminates this need by removing the worm from the equation. We focus on boosting the useful microbes in the worm gut and building an artificial ‘worm gut’ that can efficiently break down plastics.”

The study, recently published in Environment International, is aligned with the University’s commitment to fostering innovation and translating research into practical solutions that benefit society under its NTU2025 five-year strategic plan.

Developing an artificial worm gut

To develop their method, the NTU scientists fed three groups of superworms different plastic diets – High-density polyethylene (HDPE), Polypropylene (PP), and Polystyrene (PS) – over 30 days. The control group was fed a diet of oatmeal.

The NTU scientists selected the plastics as they are among the most common plastics in the world, used in everyday items like food boxes and detergent bottles. HDPE is a type of plastic known for its high-impact resistance, making it difficult to break down.

Bacteria found in the guts of these worms can break down plastics. Credit: Nanyang Technological University

After feeding the worms plastic, scientists extracted the microbiomes from their gut and incubated them in flasks containing synthetic nutrients and different types of plastics, forming an artificial ‘worm gut’. Over six weeks, the microbiomes were left to grow in the flasks at room temperature.

Increase in plastic-degrading bacteria

The scientists found that compared to the control group, the flasks that contained the gut microbiomes from the plastic-fed worms showed a significant increase in plastic-degrading bacteria.

Furthermore, the microbial communities colonizing the plastics in the flasks were simpler and more tailored to the specific type of plastic than the microbes found on plastics that had been fed directly to the worms. When the microbial communities are simpler and targeted to a specific type of plastic, this translates to the potential for more efficient plastic degradation when used in real-life applications.

First author of the study Dr Liu Yinan, Research Fellow at the School of CEE and SCELSE, said, “Our study represents the first reported successful attempt to develop plastic-associated bacterial communities from gut microbiomes of plastic-fed worms. Through exposing the gut microbiomes to specific conditions, we were able to boost the abundance of plastic-degrading bacteria present in our artificial ‘worm gut,’ suggesting that our method is stable and replicable at scale.”

The researchers say their proof-of-concept lays the foundation for developing biotechnological approaches that use worms’ gut microbiomes to process plastic waste.

For their next steps, the researchers want to understand how the bacteria in the superworm’s gut break down the plastics at the molecular level. Understanding the mechanism will help scientists engineer plastic-degrading bacterial communities to break down plastics efficiently in the future.

Reference: “Establishment of plastic-associated microbial community from superworm gut microbiome” by Yi-Nan Liu, Sakcham Bairoliya, Norazean Zaiden and Bin Cao, 23 November 2023, Environment International.
DOI: 10.1016/j.envint.2023.108349

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/nature-inspired-breakthrough-artificial-worm-gut-devours-plastic-waste/

Tags: BreakthroughNature-Inspiredscience
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