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Preparation of arabinoxylans and its sorption on bacterial cellulose during cultivation

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Winter, Heiko | Barakat, Abdellatif | Cathala, Bernard | Saake, Bodo

Edité par CCSD ; Wiley-VCH Verlag -

International audience. The sorption of arabinoxylan (AX) on bacterial cellulose was investigated by adding AX to the culture medium of Gluconacetobacter xylinus. The starting AX material was produced by alkaline extraction of oat spelts. To investigate the impact of varying AX quality, the residual lignin was reduced by ClO2 bleaching. Furthermore, bleached and unbleached xylans were subjected to xylanase hydrolysis in order to produce fractions of varying molar mass. of all samples only the water soluble fractions were used for sorption experiments. A reduced molar mass resulted in a lower sorption of AX to the cellulose, while the lignin content increased the sorption of AX on bacterial cellulose. The sorption of AX resulted in a reduction of bacterial cellulose crystallinity and cellulose lot content. In combined treatments of AX with xyloglucan and P-glucan no synergistic effect of those polysaccharides on the AX sorption was found.

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