1. Groningen Biomolecular Sciences and Biotechnology Institute & Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, Groningen Biomolecular Sciences and Biotechnology Institute (GBB), Centre for Carbohydrate Bioprocessing, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands, and Laboratorium für Physikalische Chemie, ETH Zürich, CH-8093 Zürich, Switzerland