Key Development

Researchers from IIT Madras and Panjab University have developed a portable, automated device that detects ultra-low concentrations of pesticides in water, food, and the environment—substances that threaten human and environmental health. Conventional lab methods, especially for organophosphates like Malathion, remain costly, slow, and require trained personnel.

Smart MDD: How the Device Works

Supported by the Department of Science and Technology under its ‘Technology Development and Transfer’ Programme, the team designed a field-ready, user-friendly device delivering real-time, ultra-sensitive detection. The Smart MDD (Malathion Detection Device) uses a colourimetric system with gold nanoparticles (AuNPs) and an aptamer molecule engineered to recognise Malathion specifically. When Malathion is present, the solution shifts from red to blue, and the device’s built-in optical system measures the change automatically, eliminating manual handling and enabling quick, reliable results. The research appears in the Review of Scientific Instruments.

Real-World Impact

Prof. Sujatha Narayanan Unni of IIT Madras explains that the device allows farmers, food safety authorities, and environmental regulators to monitor pesticide contamination on-site, whether in irrigation water, produce, or soil. It ensures compliance with safety standards and helps reduce public health risks. The device can also track pesticide runoff into water bodies, addressing a key environmental concern.

High Sensitivity and Future Plans

The team demonstrated a detection limit of 250 picomolar, with results closely matching lab spectrophotometers—an impressive feat for a portable system. After successful lab tests, the team will validate the device with real-world samples, including fruits, vegetables, and field water sources.

Dr Rohit Kumar Sharma of Panjab University says the platform will expand to detect a broader range of pesticides, strengthening its role in sustainable agriculture and environmental monitoring.

Source: MSN