title: Fibrillar assembly of bacterial cellulose in the presence of wood-based hemicelluloses.
abstract: Composite materials mimicking the plant cell wall structure were made by culturing cellulose-producing bacteria together with secondary-wall hemicelluloses from wood. The effects of spruce galactoglucomannan (GGM) and beech xylan on the nanoscale morphology of bacterial cellulose were studied in the original, hydrated state with small-angle X-ray scattering (SAXS). The SAXS intensities were fitted with a model covering multiple levels of the hierarchical structure. Additional information on the structure of dried samples was obtained using scanning and transmission electron microscopy and infra-red spectroscopy. Both hemicelluloses induced a partial conversion of the cellulose crystal structure from Iαto Iβand a reduction of the cross-sectional dimensions of the cellulose microfibrils, thereby affecting also their packing into bundles. The differences were more pronounced in samples with xylan instead of GGM, and they became more significant with higher hemicellulose concentrations.
authors.affiliation: Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji 611-0011, Japan.
authors.forename: Paavo A
authors.initials: PA
authors.lastname: Penttilä
authors.affiliation: Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji 611-0011, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Imai
authors.affiliation: Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji 611-0011, Japan.
authors.forename: Junji
authors.initials: J
authors.lastname: Sugiyama
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008351:Mannans / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry*; D014934:Wood / Q000737:chemistry*
chemical_list: D008351:Mannans; D011134:Polysaccharides; C443804:galactoglucomannan; C007916:hemicellulose; D002482:Cellulose
keywords: Bacterial cellulose; Hemicellulose; Hierarchical structure; Small-angle scattering