ROSALIND: Ultra-Sensitive Water Sensor Revolutionizes Safety Testing
New sensor is 10x more sensitive, detects contaminants in water.
Top Summary
- What happened: Northwestern University researchers enhanced ROSALIND, a fluorescent RNA sensor, making it 10 times more sensitive for water safety testing.
- Why it matters: Improved sensitivity allows for the detection of contaminants at extremely low concentrations, exceeding EPA safety thresholds.
- What changes for people: Easier and more reliable water testing is now possible, even without specialized lab equipment or trained microbiologists.
- Who is affected: Households, communities with contaminated water sources, and field researchers benefit from rapid, on-site contaminant detection.
Borrowing from Nature
Julius Lucks, a chemical and biological engineer at Northwestern University, developed ROSALIND.
The platform mimics microbial contaminant detectors, repurposing them in a cell-free system.
This system contains DNA, RNA, and proteins, enabling biological reactions outside living organisms.
How ROSALIND Works
When ROSALIND detects a target chemical, it triggers the production of a fluorescent RNA molecule.
The sample then glows, indicating contamination.
Minimal laboratory equipment is required for operation.
Turning Up the Volume
The initial version of ROSALIND screened for 17 contaminants from a single water drop.
Lucks's team published in Nature Chemical Biology a signal amplification circuit.
This new version utilizes an enzyme to recycle detection signals, increasing sensitivity.
Enhanced Sensitivity
The latest ROSALIND iteration is now 10 times more sensitive than before.
It can detect DNA fragments and RNA, expanding beyond small molecules and metals.
This marks a significant advancement in water safety monitoring capabilities.
Field Testing and Impact
ROSALIND is currently being used in the field.
Chicago households test their tap water for lead using the platform.
In rural Kenya, trials measure fluoride levels, a major health concern in East Africa.
Real-World Applications
CRISPR-based crop pathogen detectors, developed in Lucks’s lab, are also being tested in Kenya and Uganda.
Taking the technology out of the lab and into the field is critical...Partnering with social scientists in this work has changed our perspective to think about co-developing this technology with the people that need it the most.
Lucks emphasizes the importance of field testing and community collaboration.
What to Watch Next
Future developments will likely focus on expanding the range of detectable contaminants and further simplifying the testing process for widespread adoption. Continued field trials and community partnerships will be crucial in refining and deploying this technology to address global water safety challenges.