Acetoin reductase‐modified field‐effect sensor for the detection of acetoin in beer samples. Issue 9 (28th August 2020) - Jablonski, M.; Münstermann, F.; Molinnus, D.; Muschallik, L.; Bongaerts, J.; Wagner, T.; Keusgen, M.; Siegert, P.; Schöning, M. J.