Farmers handling pesticides and soldiers facing chemical weapons share a specific hazard: organophosphorus compounds, a class of chemicals that includes both common insecticides and military-grade nerve agents. Researchers at Northwestern University have developed a nanoparticle compound, described in ACS Nano, that can be mixed into the dyes used on fabric to help neutralize these chemicals before they do damage — a material its developers see eventually built into farmers’ masks and gloves or soldiers’ uniforms and tactical gear.

The team, led by Nathan Gianneschi and Omar Farha, took its inspiration from natural chemistry that already counteracts these compounds. They built their material around allomelanin, a renewable, biodegradable pigment found in plants and fungi, whose natural pores trap harmful molecules. Paired with a zirconium metal cluster that accelerates chemical reactions, the allomelanin breaks the trapped compounds down.

That breakdown reaction normally needs a strongly basic environment to proceed. Rather than requiring a separate basic chemical to be added at the time of use, the researchers attached basic chemical groups directly to the particle’s surface, so that water alone — sweat, rain, or a sprayed-on solution — activates it. The reaction yields two byproducts: one harmless, and one that blocks an enzyme the body needs to break down acetylcholine, a key neurotransmitter, causing it to build up and disrupt nerve signaling. The team’s material removed the harmful byproduct while leaving the harmless one untouched, cutting the toxic compound by 50 percent within 10 minutes — a reduction that sped up further with more melanin and with exposure to sunlight.

The researchers also found that allomelanin’s specific pore structure mattered: other melanin-like materials they tested performed worse, suggesting the effect isn’t just about chemistry in the abstract but about this particular pigment’s architecture. The team describes the work as a proof of concept for future protective coatings and fabrics rather than a finished product. Gianneschi described the material as non-toxic and suitable as an additive in clothing, facemasks, and other protective gear. The work was supported by the Air Force Office of Scientific Research, the Army Synthetic Biology Centre for Predictive Materials Design, and the Catalyst Design for Decarbonization Center.

Journal: ACS Nano
Article Title: Catalytic Porous Metallized Melanin for the Remediation of Organophosphorus Agents
DOI: 10.1021/acsnano.6c06991
Publication Date: August 25, 2026

Source: EurekAlert