As environmental concerns around microplastics intensify, a novel solution involving genetically modified cyanobacteria offers a new way to tackle these pollutants. The secret lies in a fragrant molecule, limonene, which effectively captures microplastics, presenting a promising method for their removal.
Microplastics have permeated almost every corner of our environment, including our bodies, oceans, and drinking water. Although the health risks remain ambiguous, advancements in analytical techniques have heightened their detectability. Current removal methods are often costly and challenging to implement on a large scale, prompting researchers to seek innovative solutions.
A recent study introduces a groundbreaking approach that merges genetic engineering with chemistry to potentially reduce microplastic pollution. This method could be pivotal whether microplastics are a serious health hazard or merely the latest environmental concern.
Genetically Engineered Algae: A Fresh Approach
Researchers led by Professor Susie Dai at Texas A&M University have developed a method to genetically alter algae, enabling them to produce limonene, a compound with a pleasant scent and the ability to absorb microplastics effectively. This breakthrough was detailed in a study published in Nature Communications.
The Genetic Engineering Process
The team successfully inserted a limonene synthase gene into the cyanobacterium’s DNA. This genetic modification allows the algae to produce significant quantities of limonene.
- The limonene-producing gene was integrated into the algae’s genetic material.
- This modification results in the algae generating substantial amounts of limonene.
Understanding Limonene’s Role
Limonene, a hydrocarbon similar to paint thinners, is slightly soluble in water but dissolves oils and plastics well. Its nonpolar nature, akin to that of turpentine, makes it particularly effective for this purpose.
The Mechanism of Microplastic Removal
The engineered cyanobacteria are cultivated in controlled environments, such as photobioreactors or ponds, where they use light and CO₂ to grow. Their limonene-coated surfaces become hydrophobic, much like microplastics themselves. This causes the microplastics to adhere to the algae, forming aggregates that eventually settle as sediment.
Once the microplastics settle, they can be harvested along with the algal biomass. This innovative method bypasses the need for expensive filtration systems by using the natural settling process to separate microplastics from water.
This approach, combining surface chemistry and synthetic biology, provides a practical solution to the microplastic problem.
Source: Remediation and upcycling of microplastics by algae with wastewater nutrient removal and bioproduction potential. Nature Communications DOI:10.1038/s41467-025-67543-5
Original Story at www.acsh.org