Positively and negatively charged xylan films

Simkovic, I; Gedeon, Ondrej; Uhliariková, Iveta; Mendichi, Raniero; Kirschnerová, Soňa

doi:10.1016/j.carbpol.2010.08.047

Cited by 26 publications

(4 citation statements)

References 13 publications

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“…The higher resolution AFM image (Figure a) reveals that the nodules with diameters of 10–70 nm were tightly connected to each other, forming a nodular structure. Similar nodular structure was also reported for other hemicellulose-based films , as well as films from other polymers such as cellulose, cellulose acetate, and starch . Great efforts have been made to investigate the nodule formation mechanism, and several theories have been developed.…”

Section: Resultssupporting

confidence: 84%

Nanocomposite Films Based on Xylan-Rich Hemicelluloses and Cellulose Nanofibers with Enhanced Mechanical Properties

et al. 2011

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Interest in xylan-rich hemicelluloses (XH) film is growing, and efforts have been made to prepare XH films with improved mechanical properties. This work described an effective approach to produce nanocomposite films with enhanced mechanical properties by incorporation of cellulose nanofibers (CNFs) into XH. Aqueous dispersions of XH (64-75 wt %), sorbitol (16-25 wt %), and CNF (0-20 wt %) were cast at a temperature of 23 °C and 50% relative humidity. The surface morphology of the films was revealed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The thermal properties and crystal structure of the films were evaluated by thermal analysis (TG) and X-ray diffraction (XRD). The surface of XH films with and without CNF was composed primarily of nanonodules, and CNFs were embedded in the XH matrix. Freeze-dried XH powder was amorphous, whereas the films with and without CNF showed a distinct peak at around 2θ = 18°, which suggested that XH molecules aggregated or reordered in the casting solution or during water evaporation. Furthermore, the nanocomposite films had improved thermal stability. XH film with 25 wt % plasticizer (sorbitol, based on dry XH weight) showed poor mechanical properties, whereas incorporation of CNF (5-20 wt %, based on the total dry mixture) into the film resulted in enhanced mechanical properties due to the high aspect ratio and mechanical strength of CNF and strong interactions between CNF and XH matrix. This effective method makes it possible to produce hemicellulose-based biomaterials of high quality.

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Section: Resultssupporting

confidence: 84%

Nanocomposite Films Based on Xylan-Rich Hemicelluloses and Cellulose Nanofibers with Enhanced Mechanical Properties

et al. 2011

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“…Mixtures of arabinogalactans and rhamnogalacturonans from sugar beet pulp were cationized and fractionated by the same research group in classical alkaline medium [115] and even in acidic conditions (at pH 1.5 adjusted with trifluoroacetic acid, H 3 PO 4 or HCl) [116]. Xylans from beech holocellulose were the polysaccharide most recently cationized by this group and their film properties were studied [117].…”

Section: Cellulose Hydroxyethylcellulose and Carboxymethylcellulosementioning

confidence: 99%

Cationization of polysaccharides: A path to greener derivatives with many industrial applications

Prado

Matulewicz

2014

European Polymer Journal

176

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“…31 Some researchers have discussed films made from xylans, especially their mechanical properties, as well as oxygen and moisture barrier properties. 32,33 Different chemical derivatizations of xylans from various sources have been performed and evaluated in order to introduce specific functions, such as water solubility 34 and antithrombotic or antimicrobial properties. 35 For cationic xylan derivatives a wide range of applications are proposed, such as flocculation agents, paper strength improvers, antimicrobial agents, etc.…”

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confidence: 99%

Adsorption of cationized xylans onto polyethylene terephthalate fabrics for antimicrobial medical textiles

Velkova

Zemljič

Saake

et al. 2017

Textile Research Journal

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The main aim of this research was development of thin functional xylan layers on polyethylene terephthalate (PET) fabric surfaces. Xylans, derived from hard wood and oat spelt, were modified chemically in order to introduce cationic functional groups. Cationization of xylans was proved by elemental analysis, total bound nitrogen determination, and Raman techniques, as well as by polyelectrolyte titrations. The antimicrobial activity of xylans was investigated by the determination of Minimal Inhibitory Concentration against bacteria S. aureus and E. coli, and fungi C. albicans. Xylan solutions were then applied onto PET fabric using the spray coating technique. Charging behavior of the treated PET fabric samples was evaluated by potentiometric titration supported by X-ray electron spectroscopy. Hydrophilicity was examined by the water contact angle determination. The morphology of coated fabrics was analyzed using Scanning Electron Microscopy. The results of microbial testing showed that PET fabrics functionalized by cationic xylans act antimicrobially against S. aureus and E. coli. The presented work suggests that cationized xylans, originally derived from hard wood and/or oat spelt, could be applied successfully as a coating material for PET fabrics in order to introduce hydrophilicity and antimicrobial properties.

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Positively and negatively charged xylan films

Cited by 26 publications

References 13 publications

Nanocomposite Films Based on Xylan-Rich Hemicelluloses and Cellulose Nanofibers with Enhanced Mechanical Properties

Nanocomposite Films Based on Xylan-Rich Hemicelluloses and Cellulose Nanofibers with Enhanced Mechanical Properties

Cationization of polysaccharides: A path to greener derivatives with many industrial applications

Adsorption of cationized xylans onto polyethylene terephthalate fabrics for antimicrobial medical textiles

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