1. Department of Food Processing Engineering, Institute of Food Science and Biotechnology; Hohenheim University; D-70599 Stuttgart Germany
2. Apicultural State Institute; Hohenheim University; August-v.Hartmann-Str. 13 D-70599 Stuttgart Germany
3. Department of Food Physics and Meat Science, Institute of Food Science and Biotechnology; Hohenheim University; D-70599 Stuttgart Germany