A research team from City University of Hong Kong has engineered a novel MoS₂-coated membrane that significantly enhances the detection of environmental DNA (eDNA) in seawater.

  • Developed a functionalised membrane using 2D Molybdenum Disulphide (MoS₂).
  • Significantly improves sensitivity in detecting trace genetic material in seawater.
  • Enables non-invasive monitoring of marine ecosystems and fish populations.

HONG KONG: In a major leap for marine conservation, a research team from the City University of Hong Kong (CityUHK) has successfully developed a novel functionalised membrane designed to enhance the collection and detection of environmental DNA (eDNA). This innovation provides a highly sensitive technical tool for monitoring marine biodiversity, addressing a long-standing challenge in aquatic science.

Environmental DNA (eDNA) refers to trace genetic material—such as skin cells, mucus, and excreta—that organisms naturally release into their environment. By analyzing these traces in water samples, scientists can identify species present without the need for physical capture. However, the extremely low concentration of DNA in seawater has traditionally made effective collection difficult using standard membranes.

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The Science Behind the Innovation

Led by Professor Kenneth Leung Mei-yee and Professor Zeng Zhiyuan, the research team utilized advanced materials science to solve this problem. As detailed in the journal National Science Review, the researchers coated a standard membrane with an ultra-thin layer of molybdenum disulphide (MoS₂), a 2D material. This coating grants the membrane a superior DNA-binding capability, allowing it to capture genetic material far more effectively than previous iterations.

The membrane is simple to prepare and cost-effective, and can be directly integrated into existing water sampling filtration processes.

Proven Success in Lab and Field Tests

The efficacy of the new membrane was demonstrated through rigorous testing. In laboratory settings, the team successfully identified various tropical coral reef fish, including Acanthurus dussumieri and Paracanthurus hepatus. Moving from the lab to the real world, field tests conducted at the Hoi Ha Wan Marine Park showed that the membrane could detect a wider array of species, including anchovies and carangid fish, without disrupting the community assessment.

Why This Matters

BozokMedia analysis shows that as global marine ecosystems face unprecedented threats from climate change and overfishing, the ability to conduct rapid, non-invasive, and highly accurate biodiversity surveys is critical. This technology offers a scalable solution for long-term environmental monitoring, especially in resource-rich but hard-to-survey marine areas.

Historical Background

While eDNA metabarcoding has revolutionized biology, the 'dilution effect' in large bodies of water like oceans has always been its Achilles' heel. Traditional filtration methods often missed the subtle genetic signatures of rare or elusive species. The integration of 2D materials like MoS₂ marks a new era in bio-sensing technology.

Did You Know?: eDNA-based monitoring allows scientists to detect the presence of endangered species even if they are only swimming in the area for a few minutes.

Frequently Asked Questions

1. How does eDNA help in conservation?
It allows scientists to map species distribution and ecosystem health without disturbing the animals or their habitats.

2. What makes the MoS₂ membrane unique?
The 2D molybdenum disulphide layer provides a high surface area and specific chemical affinity for DNA, making it much more sensitive than regular filters.