Gold-Cored Nanoplastics Reveal How Plants Absorb Pollution

Nanoplastics are notoriously difficult to detect in biological systems, leaving us in the dark about their precise movement and health risks. To solve this, researchers synthesised a clever 'dual-detectable' model particle: a gold nanoparticle core wrapped in a polystyrene shell. This design allows for two distinct tracking methods to be used simultaneously.

First, Surface-Enhanced Raman Spectroscopy (SERS)—a technique that uses light scattering to identify molecules—enables the visualisation of individual particles within tissue. Second, Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) allows scientists to precisely measure the quantity of gold, and thus the plastic.

Testing this on garlic plants (Allium sativum), the team found that roots act as a reservoir, trapping the nanoplastics. Over a 30-day period, the roots accumulated significant amounts of plastic, with uptake rising strictly in line with environmental concentration and exposure time. Crucially, the analysis confirmed the particles remained in the roots rather than travelling up to the plant's upper parts. This stable, trackable model provides a robust new tool for accurately mapping how pervasive plastic pollution interacts with living biota.