1. Institute of Analytical and Bioanalytical Chemistry; Ulm University; Albert-Einstein-Allee 11 89081 Ulm Germany
2. Department of Bioresources and Polymer Science University; Politehnica of Bucharest; 1-7 Polizu Street 011061 Bucharest Romania
3. Analytical Chemistry - Center for Electrochemical Sciences (CES); Ruhr University Bochum; Universitätsstr. 150 44780 Bochum Germany