Scientists at the Institute of Nano Science and Technology (INST) have developed a fluorescent “turn-on” sensor capable of rapidly detecting nicotine and its metabolite, cotinine, in biological and aqueous environments.
The sensor is based on an iron metal-organic framework (Fe-III-MOF), which uses porous nanospheres to trap target molecules and produce a measurable fluorescence signal. When nicotine or cotinine enters the structure, the material emits a stronger blue fluorescence, enabling quick visual detection without complex instrumentation.
Unlike conventional methods such as chromatography-based testing, which require specialised equipment and processing, the new sensor is low-cost, easy to operate, and works in real-time conditions. The study also confirms biocompatibility and low cytotoxicity, allowing use in living cells and supporting applications such as intracellular imaging.
The development expands the scope for rapid screening of tobacco exposure, including environmental monitoring and biological testing, with potential use in both laboratory and field settings.
Key Features of the Fe-MOF Sensor
Rapid Detection: Offers an immediate "turn-on" fluorescent signal upon contact with nicotine or cotinine.
Biocompatibility: The iron-based structure is safe for biological applications, allowing for intracellular imaging and confocal microscopy.
Selective & Recyclable: Specifically targets smoking biomarkers and can be reused, increasing its cost-effectiveness.
Simplified Operation: Eliminates the need for complex sample preparation or expensive laboratory equipment required by traditional methods.
Public Health Utility: Ideal for monitoring second-hand smoke exposure and research into addiction and metabolism.
What is an "Iron Metal-Organic Framework (Fe-III-MOF)"?
An iron metal-organic framework (MOF) is a microscopic, sponge-like structure made by linking iron ions with organic molecules.
These structures are full of tiny, uniform pores that act like "molecular traps." In this specific sensor, the pores are designed to perfectly fit nicotine and cotinine molecules. When these "guest" molecules enter the "host" pores, they trigger an electron transfer that causes the iron framework to emit a stronger, brighter light (fluorescence).
Because iron is abundant and safe, these MOFs are a preferred choice for medical and biological sensors compared to more toxic heavy-metal alternatives.
Policy Relevance
Expands Low-Cost Diagnostic Tools: Simplified detection methods enable wider access to tobacco exposure screening beyond specialised labs.
Supports Tobacco Control Enforcement: Rapid environmental and biomarker testing can strengthen monitoring of smoke-free regulations and public spaces.
Enables Non-Invasive Health Monitoring: Detection of cotinine in biological samples supports routine screening without invasive procedures.
Strengthens Public Health Surveillance: Scalable sensing technologies improve data collection on exposure patterns and health risks.
Builds Indigenous Deep-Tech Capacity: Development within a DST-supported institute highlights progress in nanotechnology-driven diagnostics.
Relevant Question for Policy Stakeholders: How can the Ministry of Health integrate these fluorescent nano-spheres into portable 'Nicotine Breathalyzers' to provide real-time data for anti-addiction counselling and public health surveys?
Follow the Full News Here: PIB: A Glowing Alert for Nicotine