1. Department of Pharmaceutical Technology and Biopharmacy, Institute of Pharmacy, Martin Luther University, Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle/Saale, Germany, Department of Physical Chemistry, Institute of Chemistry, Martin Luther University, Halle-Wittenberg, 06099 Halle/Saale, Germany, and Institute of Physiological Chemistry, Faculty of Medicine, Martin Luther University, Halle-Wittenberg, Hollystrasse 1, 06114 Halle/Saale, Germany