1. Department of Biochemistry and Microbiology University of Chemistry and Technology Prague Technická 3 Prague 16625Czech Republic
2. Ecole Nationale Supérieure de Chimie de Rennes CNRS ISCR‐UMR 6226 Univ Rennes 35000Rennes France
3. Department of Carbohydrates and Cerials University of Chemistry and Technology Prague Technická 3 Prague 16625Czech Republic
4. Centre Mondial de l’Innovation Roullier Laboratoire de Nutrition Végétal 18 Avenue Franklin Roosevelt Saint‐Malo 35400 France