If you have an ACS member number, please enter it here so we can link this account to your membership. (optional)

ACS values your privacy. By submitting your information, you are gaining access to C&EN and subscribing to our weekly newsletter. We use the information you provide to make your reading experience better, and we will never sell your data to third party members.



Microbial enzyme could help clean up explosives

New way to detect and destroy the increasingly popular munition 2,4-dinitroanisole

by Ryan Cross
October 10, 2016 | A version of this story appeared in Volume 94, Issue 40

Scientists have been seeking ways to remediate soil at military testing grounds and other places that have been contaminated with explosives.

Now, a research team has devised a method for detecting and destroying the explosive compound 2,4-dinitro­anisole (DNAN) that’s inspired by bacteria. Jim Spain of the University of West Florida and coworkers previously discovered an ether hydrolase enzyme in the bacterium Nocardioides sp. JS1661, which they found in wastewater from a DNAN manufacturing plant. In a new study, Spain’s group found that the hydrolase can function outside the microbe, without any added cofactors (Environ. Sci. Technol. 2016, DOI: 10.1021/acs.est.6b03044).

The enzyme converts DNAN into 2,4-dinitrophenol, whose yellow color indicates DNAN’s presence. The researchers first immobilized the enzyme in silica to demonstrate that it could be used to detect DNAN in waste streams or used in bioreactors to destroy DNAN. They also coated cellulose filter paper with the enzyme so that it could be used in the field to signal DNAN contamination.

“Defense departments are interested in employing DNAN in their arsenal because it is safer to handle and is less sensitive than TNT and other traditional explosives,” says Jalal Hawari of Montreal Polytechnic who also studies microbes for cleaning up explosives. “This work came at a perfect time,” he says.

Spain hopes to avoid the land and groundwater contamination that’s happened with other explosives. He says: “For the first time, we are being proactive” about finding ways to biodegrade explosives before they’re widely used.


This article has been sent to the following recipient:

Chemistry matters. Join us to get the news you need.