'Sweet' solution to kill bacteria in drinking water developed

A team of Indian origin researchers in Canada has developed paper strips laced with sugar that can be used to kill harmful E coli bacteria in contaminated water in remote villages of India and around the world.
According to researcher Sushanta Mitra from York University, the "DipTreat" discovery will be key to developing a new generation of inexpensive and portable water treatment devices, with human health benefits around the world.
DipTreat is the latest innovation by researchers at York's Lassonde School's Micro and Nano-scale Transport (MNT) Lab, who had previously discovered new ways to detect E coli in contaminated water using a Mobile Water Kit.

"Now with DipTreat, we have learned it will take less than two hours to fish, trap and kill E coli in water," said Mitra, who heads the lab.
"We were able to efficiently remove almost 90 per cent of bacteria by dipping the special paper strip, DipTreat, in contaminated water samples," Mitra said.
DipTreat may have an impact on the global health scenario, from the far north of Canada to the remote villages of India, and around the world, researchers said.

While using porous paper strips to trap the bacterial cells, for killing, the researchers used an antimicrobial agent extracted from the seeds of moringa - commonly known as drumstick or horseradish tree.

As a result, the DipTreat solution for water treatment uses only naturally available antimicrobial substances and sugar, with minimal environmental and health impact.
Currently, popular water treatment systems use silver nanoparticles and clays, whose long term impact on human health is yet to be fully understood, according Mitra. So far, DipTreat is effective for small quantities of water.
For example, someone who is hiking can collect a glass of water and then dip the paper strips to purify it before drinking. Researchers believe that the invention could lead to a much greater impact.
"We expect this new approach to 'fish', 'trap' and 'kill' E coli will seamlessly eliminate the harmful bacteria from water," said Mitra.

Recognising the global importance of water purification technology, UNICEF has invited Mitra to showcase his team's work at a stakeholder meeting in Copenhagen on November 22.
The study, co-authored by Mitra, Saumyadeb Dasgupta and Naga Siva Gunda was published in the journal Environmental Science Water Research & Technology.