A combination of X-ray photoelectron spectroscopy and Raman spectroscopy has been used to confirm that bioreceptor molecules attached to a graphene biosensor can be used to detect biomarkers for cancer in samples. The biomarkers might be present in blood, saliva or urine samples. Proof of principle was done by a team from the University of Swansea, UK, using 8-hydroxydeoxyguanosine (8-OHdG), as the biomarker. "We're very interested in adapting the graphene sensor platform for a number of other disease biomarkers and for simultaneous detection of a number of biomarkers on the same chip," team member Owen Guy says. "This is very challenging, but could ultimately result in much more informative Point-of-Care, rapid diagnostics."