1. Department of Food Chemistry, Institute of Biochemistry and Technical Biochemistry, University of Stuttgart, Allmandring 5b, 70569 Stuttgart, Germany
2. Department of Chemistry, Institute of Food Chemistry, Hamburg University, Martin-Luther-King Platz 6, 20146 Hamburg, Germany
3. Lake of Constance Research Centre for Fruit Cultivation (KOB), Schuhmacherhof 6, 88213 Ravensburg, Germany