Surface Plasmon Resonance Studies of Pullulan and Pullulan Cinnamate Adsorption onto Cellulose

Abstract

Surface plasmon resonance studies showed pullulan cinnamates (PCs) with varying degrees of substitution (DS) adsorbed onto regenerated cellulose surfaces from aqueous solutions below their critical aggregation concentrations. Results on cellulose were compared to PC adsorption onto hydrophilic and hydrophobic self-assembled thiol monolayers (SAMs) on gold to probe how different interactions affected PC adsorption. PC adsorbed onto methyl-terminated SAMs (SAM-CH(3)) > cellulose > hydroxyl-terminated SAMs (SAM-OH) for high DS and increased with DS for each surface. Data for PC adsorption onto cellulose and SAM-OH surfaces were effectively fit by Langmuir isotherms; however, Freundlich isotherms were required to fit PC adsorption isotherms for SAM-CH(3) surfaces. Atomic force microscopy images from the solid/liquid interfaces revealed PC coatings were uniform with surface roughnesses <2 nm for all surfaces. This study revealed hydrogen bonding alone could not explain PC adsorption onto cellulose and hydrophobic modification of water-soluble polysaccharides was a facile strategy for their conversion into surface modifying agents.

Correlation between cellulose thin film supramolecular structures and interactions with water

“…21 On the other hand the herein exploited spin coating procedure generates highly amorphous and unoriented regenerated cellulose films. 38,39 Therefore, chemically identical pure cellulose films with different structural features were obtained, and the influence of crystallinity, surface roughness and film porosity on the water interactions at molecular level can be systematically and directly investigated with nanoscale sensitivity. The effect of film formation method on morphology and surface roughness of the cellulose films was determined using AFM.…”

Characterisation of amino acid modified cellulose surfaces using ToF-SIMS and XPS

“…The technique has been subsequently applied to a large range of lignocellulosics (Maximova et al 2001;Koljonen et al 2003;Gustafsson et al 2003;Johansson et al 1999). Other applications of XPS to cellulose have been the monitoring of the extent of modification/regeneration (Buchholz et al 1997;Cunha et al 2007;Yuan et al 2006;Bagheri et al 2008), quantification of cellulosic content in thin films (Kontturi et al 2005(Kontturi et al , 2007(Kontturi et al , 2009) and quantification of adsorbed species on cellulosic substrates (Maximova et al 2001;Rojas et al 2000;Kaya et al 2009;Kontturi et al 2008). In the present work we are mostly concerned with detecting the presence of amino acids on the cellulosic surface.…”

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

“…There is a dearth of cell wall models and the few available can be categorized as blends of polymer materials and regenerated cellulose or bacterial cellulose 14 , enzymatically polymerized lignin-polysaccharide composites [15][16][17] , or model surfaces [18][19][20][21] . Some models that begin to resemble the cell wall are the samples that contain lignin precursors or analogs polymerized enzymatically in the presence of cellulose in its microfibrillar form.…”