1. Mines ParisTech, Centre de Mise en Forme des Matèriaux - CEMEF, UMR CNRS/Ecole des Mines de Paris 7635, BP 207, 06904 Sophia-Antipolis, France, Centre of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstraβe 10, D-07743 Jena, Germany, and Research Centre for Medical Technology and Biotechnology GmbH, Geranienweg 7, D-99947 Bad Langensalza, Germany