Researchers in Brazil have made a significant advancement in agricultural safety by creating a biodegradable sensor that can be attached to plants to detect the presence of pesticides on vegetables. This novel sensor is crafted from cellulose acetate – a compound derived from wood pulp – and carbon, materials that are not only inexpensive and simple to produce but also safe for food contact and the environment.
The development of the sensor is a collaboration between experts at the Federal University of Viçosa and the University of São Paulo. It stands out for its sustainability, scoring high on the Green Analytic Chemistry (GAC) AGREE and AES metrics, highlighting its eco-friendliness.
Pesticides, while essential in modern agriculture for controlling various pests and diseases, can pose significant health risks when present in high concentrations. With increased agricultural pesticide use, the risk of these chemicals accidentally spreading through wind and contaminating nearby crops also rises, making it crucial to ensure safe levels for human consumption.
The sensor’s performance was rigorously evaluated using two commonly used pesticides: carbendazim, an antifungal sprayed on citrus crops, and paraquat, a potent herbicide. Both chemicals are known for their adverse effects, with carbendazim being linked to male reproductive issues and paraquat being highly toxic if inhaled or ingested.
Tests were conducted on pesticide concentrations ranging from 0.1 to 1.0 μM (0.1 to 1 ppm) on lettuce and tomatoes, which is within the lower limit of the US FDA’s acceptable levels for food crops. Remarkably, the sensors maintained their high detection capability even after enduring multiple bends, demonstrating their durability and practicality. They also proved effective in tracking the levels of pesticides during both contamination events and decontamination through washing.
These findings suggest that such sensors could play a critical role in ensuring the safety of vegetables before they reach consumers. In the meantime, using a high-quality vegetable wash can be a practical interim measure for reducing pesticide residues.
The invention of this biodegradable, plant-wearable sensor marks a promising step toward improved food safety and environmental sustainability, providing a reliable method for detecting harmful pesticides and potentially reducing the risks associated with their use on food crops.
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