1. Interdisciplinary Research Center for BioSystems, Land Use and Nutrition (IFZ), Department of Food Sciences, Institute of Nutritional ScienceJustus-Liebig University of Giessen Heinrich-Buff-Ring 26–32 35392 Giessen Germany
2. Institute of Chemistry, Department of Bioinorganic ChemistryUniversity of Hohenheim Garbenstr. 30 70599 Stuttgart Germany
3. Present address: Institute of Insect Biotechnology, Department of Applied Entomology, IFZJustus-Liebig University Giessen Heinrich-Buff-Ring 26–32 Giessen Germany