Paper strip developed to detect food and water contamination
In order to make the process of checking food and water for pesticides and contamination more efficient, cost-effective and quick, researcher John D. Brennan and his colleagues at McMaster University in Hamilton, Ontario, have developed a paper sensor, which reminds us of the litmus paper we used in lab tests back in our school days. This simple paper sensor - a “laboratory on a strip” – changes color in a very short time when it’s one end is submerged in the sample. One end of the paper strip contains enzyme while the other end contains a compound called IPA. If there are no pesticides in the sample, the paper strip turns blue; otherwise the intensity of color change would depend on the amount of pesticides present in the sample.
Via: NY Times
