Antibiotic levels can be measured in breath for first time
A team of engineers and biotechnologists at the University of Freiburg has for the first time shown in mammals that the concentration of antibiotics in the body can be determined using breath samples. The breath measurements also corresponded to the antibiotic concentrations in the blood. The team’s biosensor—a multiplex chip that allows simultaneous measurement of several specimens and test substances—will in future enable personalized dosing of medicines against infectious diseases on-site and help to minimize the development of resistant strains of bacteria.
The sensor developed by the research group headed by Dr. Can Dincer and H. Ceren Ates, FIT Freiburg Center for Interactive Materials and Bioinspired Technologies, and Prof. Dr. Wilfried Weber, Professor of Synthetic Biology and a member of the team of speakers at the Cluster of Excellence CIBSS—Centre for Integrative Biological Signaling Studies, is based on synthetic proteins that react to antibiotics and thus generate a current change. The researchers’ results are now being published in the journal Advanced Materials.
Previously researchers could only detect traces of antibiotics in the breath
The researchers tested the biosensor on the blood, plasma, urine, saliva and breath samples of pigs who had received antibiotics. They were able to show that the result achieved with biosensors in the pigs’ plasma were as accurate as the standard medical laboratory process. Previously, measurement of antibiotic levels in exhaled breath samples was not possible: “Until now researchers could only detect traces of antibiotics in the breath. With our synthetic proteins on a microfluidic chip, we can determine the smallest concentrations in the breath condensate and they correlate with the blood values,” explains Dincer.
Sensor will help to keep antibiotic level stable in severely ill
Physicians need to keep the antibiotics level within a personalized therapeutic range for patients suffering severe infections, at the risk of threats such as sepsis and organ failure or even the death of the patient. Inadequate administration of antibiotics could allow bacteria to mutate so that the medicines no longer work: they become resistant. “Rapid monitoring of antibiotic levels would be a huge advantage in hospital,” says Ates, “it might be possible to fit the method into a conventional face mask.” In another project at the University of Freiburg, Dincer is developing wearable paper sensors for the continuous measurement of biomarkers from exhaled breath. Clinical trials to validate the antibiotic biosensor by testing the system with human samples are planned.
Bacterial proteins as sensor
Source: Read Full Article