Soon there might be yet another substitute to the aching finger-prick blood glucose tests that people with diabetes have to undertake every day. Researchers in Saudi Arabia have designed a paper-strip sensor that computes blood glucose through the saliva of a patient. The study is being directed by electrical engineer Khaled Salama, materials scientist Derya Baran, and bioscientist Sahika Inal, everyone from the King Abdullah University of Science and Technology.
They began by filling a commercial ink entailing electrically conductive polymers within an inkjet printer and then went on to print microscale electrode prototypes onto lustrous paper strips, utilizing that ink. Subsequently, they printed a film of an enzyme called glucose oxidase over the electrodes’ top. At last, they covered the entire object with a Nafion polymer membrane.
Consequently, when saliva was supplied to the sensor, the glucose existing in the body fluid interacted with the glucose oxidase, producing an electrical signal. This signal was taken up by the electrodes and can be interpreted by a distinct tool—the signal’s strength matched to the levels of blood glucose of the individual who provided the saliva.
Saliva of enclose substances such as ascorbic acid that usually would electrically meddle with the conducting polymers. Nevertheless, it was prevented from happening by the Nafion membrane as it resisted the negative electrical charges generated by such substances. Also, that membrane enhanced the sensor’s shelf life, enabling the glucose oxidase to remain active even after being hoarded for a month in a closed bag.
Likewise, to assist kids born with cognitive developmental and neuromotor disabilities, scientists from the Harvard University have designed a non-toxic, soft wearable sensor that fastens to the hand and computes the force of a clutch and the motion of the fingers and hand. One novel constituent of the sensor is a highly conductive, non-toxic liquid solution.