Concerning Findings: New Research Reveals That Washing Your Fruit Doesn’t Remove All Pesticides

A new study has introduced a technique using surface-enhanced Raman spectroscopy (SERS) to detect low levels of pesticide residues on food, suggesting that washing alone might be insufficient to remove pesticides, and peeling may be necessary.

Pesticides and herbicides are critical to ensuring food security worldwide, but these substances can present a safety risk to people who unwittingly ingest them. Protecting human health, therefore, demands sensitive analytical methods to identify even trace levels of potentially harmful substances. Now, researchers reporting in ACS’ Nano Letters have developed a high-tech imaging method to detect pesticide contamination at low levels, and its application on fruits reveals that current food safety practices may be insufficient.

The analytical method called surface-enhanced Raman spectroscopy (SERS) is gaining popularity as a nondestructive method for detecting chemicals from modern farming on produce. With SERS, metal nanoparticles or nanosheets are used to amplify the signals created by molecules when they are exposed to a Raman laser beam.