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    Equilibrium Water Contents of Cellulose Films Determined via Solvent Exchange and Quartz Crystal Microbalance with Dissipation Monitoring

    Year: 2011

    Journal: Biomacromolecules, 2011, 12 (8), pp 2881–2887, 20110906

    Authors: Kittle J.D. †, Du X. †, Jiang F. ‡, Qian C. ‡, Heinze T. §,  Roman M. ‡, Esker A.R.*†

    Last authors: Alan R. Esker

    Organizations: †Department of Chemistry and ‡Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, Virginia 24061, United States Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstrasse 10, Jena, 07743 Germany

    Country: Germany, USA, US, United States, United States of America, America

    Model cellulose surfaces have attracted increasing attention for studying interactions with cell wall matrix polymers and as substrates for enzymatic degradation studies. Quartz crystal microbalance with dissipation monitoring (QCM-D) solvent exchange studies showed that the water content of regenerated cellulose (RC) films was proportional to the film thickness (d) and was consistent with about five water molecules per anhydroglucose unit. Sulfated nanocrystalline cellulose (SNC) and desulfated nanocrystalline cellulose (DNC) films had comparable water contents and contained about five times more water than RC films. A cellulase mixture served as a probe for studies of substrate accessibility and degradation. Cellulase adsorption onto RC films was independent of d, whereas degradation times increased with d. However, adsorption onto SNC and DNC films increased with d, whereas cellulase degradation times for DNC films were independent of studied d. Enhanced access to guest molecules for SNC and DNC films revealed they are more porous than RC films.