Biodegradable 'Plant-Wearable' Sensor To Detect Pesticides on Fruits and Vegetables: Study

Scientists at the University of São Paulo (USP) and the Federal University of Viçosa (UFV) in Brazil have introduced a 'plant-wearable' sensor made from biodegradable cellulose acetate. This device, detailed in the journal Biomaterials Advances, is designed to be placed directly on fruits or vegetables to detect the presence of pesticides. The environmentally friendly sensor not only aids in ensuring food safety but also addresses the escalating issues associated with agrochemical use, offering a sustainable solution to the challenges faced by the food industry.

Cellulose Innovation for Safer Produce

The 'plant-wearable' sensor developed by Brazilian researchers is crafted from cellulose acetate, a plant-derived material with minimal environmental impact. This eco-friendly substrate disintegrates completely within 340 days, addressing concerns of sustainability.

Electrochemical Efficiency

Unlike traditional methods that rely on chromatographic techniques, the electrochemical sensor combines affordability, rapid detection, and in situ pesticide monitoring. Its unique feature lies in conducting analysis directly on the surface of fruits, vegetables, or leaves, providing an effective solution for real-world scenarios.

Laboratory Trials and Results

Laboratory tests simulated real-world conditions by spraying a solution containing fungicide and herbicide on lettuce and tomatoes. The sensor, attached directly to the product, demonstrated a detection capability comparable to commonly used materials.

Biodegradable Advantage

The cellulose acetate substrate, produced through a casting method, presents an eco-friendly alternative to traditional materials. The researchers showcased the sensor's ability to function optimally while embracing biodegradability.

Ineffectiveness of Washing

The study also explored the efficacy of washing and immersing vegetables in water for pesticide residue removal. The results revealed that these methods were insufficient, leaving at least 10 percent of residues on the leaves or peel.

Broad Applications

The novel sensor holds promise for global sanitary surveillance agencies and organic produce sellers, providing a tool to certify the absence of pesticides. Additionally, farmers can utilize the technology to monitor pesticide levels in the field, optimizing dosage and potentially reducing overall pesticide use.