1 Technische Universität Berlin, Institute of Food Technology and Food Chemistry, Department of Food Chemistry and Analysis, Gustav-Meyer-Allee 25, D-13355 Berlin, Germany; Suez Canal University, Agriculture Faculty, Food Technology Department, 41522 Ismailia, Egypt.
3 Technische Universität Berlin, Institute of Food Technology and Food Chemistry, Department of Food Chemistry and Analysis, Gustav-Meyer-Allee 25, D-13355 Berlin, Germany.
4 University of Hamburg, Hamburg School of Food Science, Institute of Food Chemistry, Grindelallee 117, D-20146 Hamburg, Germany. Electronic address: rohn@chemie-uni-hamburg.de.