Multilayers of cellulose derivatives and chitosan on nanofibrillated cellulose

Junka, Karoliina; Sundman, Ola; Salmi, Jani; Österberg, Monika; Laine, Janne

doi:10.1016/j.carbpol.2014.02.061

Cited by 15 publications

(8 citation statements)

References 42 publications

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“…[18][19][20][21] On the other hand, more research interest is evoked towards the use of sustainable materials, such as polysaccharides. [22][23][24][25][26] Polysaccharides as biopolymers have several advantageous features, such as abundance, renewability, nontoxicity, biocompatibility and biodegradability. 14,27 Among them, cellulose is the most abundant natural polysaccharide, which consists of β-(1 → 4)-linked anhydroglucose units (AGUs).…”

Section: Introductionmentioning

confidence: 99%

Stimuli-responsive nanoparticles from ionic cellulose derivatives

2016

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Stimuli-responsive nanoparticles (NPs) based on sustainable polymeric feedstock still need more exploration in comparison with NPs based on synthetic polymers. In this report, stimuli-responsive NPs from novel ionic cellulose derivatives were prepared via a facile nanoprecipitation. Cellulose 10-undecenoyl ester (CUE) with a degree of substitution (DS) of 3 was synthesized by esterification of cellulose with 10-undecenoyl chloride. Then, CUE was modified by photo-induced thiol-ene reactions, in order to obtain organo-soluble ionic cellulose derivatives with DSs of ∼3, namely cellulose 11-((3-carboxyl)ethylthio)undecanoate (CUE-MPA), cellulose 11-((2-aminoethyl)thio)undecanoate (CUE-CA), cellulose 11-(2-(2-(diethylamino)ethyl)thio)undecanoate (CUE-DEAET) and cellulose 11-(2-(2-(dimethylamino)ethyl)thio)undecanoate (CUE-DMAET). CUE-MPA could be transformed into NPs with average diameters in the range of 80-330 nm, but these NPs did not show particular stimuli-responsive properties. Moreover, the dropping technique resulted in smaller NPs than a dialysis technique. Stable NPs with average diameters in the range of 90-180 nm showing pH-responsive and switchable sizes were obtained from CUE-DEAET and CUE-DMAET possessing tertiary amines using nanoprecipitation. Thus, altering the terminal functional groups will be a new approach to prepare stimuli-responsive cellulose-derived polymeric NPs.

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Section: Introductionmentioning

confidence: 99%

Stimuli-responsive nanoparticles from ionic cellulose derivatives

2016

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“…The impact of nonelectrostatic interactions on the deposition of multilayer systems of cellulose and chitosan have been recently described in detail by other authors. 27 Moreover, the formation of multilayers from low charge polyelectrolytes have been reported, attributing this fact to the presence of synergistic nonelectrostatic interactions that contribute to the layer formation. 28,29 After the consecutive addition of new layers of the oppositely charged biopolymers, the SZP of the subsequent layer presented a positive charge (CHI layers) or negative charge (ALG layers).…”

Section: ■ Results and Discusionmentioning

confidence: 99%

Modulating Biopolymer Electrical Charge to Optimize the Assembly of Edible Multilayer Nanofilms by the Layer-by-Layer Technique

et al. 2015

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The aim of this work was to study the influence of biopolymer (alginate, ALG; chitosan, CHI) charge on the formation of multilayer nanofilms by the layer-by-layer (LbL) technique. The electrical charge of ALG and CHI (high, medium, or low) was modulated by adjusting the pH of biopolymer solutions. The amount of biopolymer deposited in multilayers depended on the charge of ALG and CHI solutions. The lower the charge the higher the deposition rate due to the higher number of biopolymer molecules needed to neutralize the previous layer. Medium and low charge biopolymers led to a drastic change in the wettability of multilayers, with ALG layers being strongly hydrophilic and CHI layers strongly hydrophobic. The surface ζ-potential alternatively changed from negative to positive using ALG or CHI. This effect was more pronounced using highly charged biopolymers. Results obtained in this study evidenced that the multilayers properties can be tuned by controlling the biopolymer electrical charge.

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“…NaCl was purchased from Fisher Scientific (Fair Lawn, NJ). Cationic polyelectrolyte quaternized hydroxyethylcellulose ethoxylate (QHEC) was purchased from Sigma-Aldrich (St. Louis, MO, USA), with a molecular weight between 400,000 and 500,000, cationic substitution of about 5 wt% and charge density of 1.2 mEq g −1 (Dalvi & Dave, 2009;Junka, Sundman, Salmi, Österberg, & Laine, 2014;Frenzel, Swaboda, Petzold, Emmler, & Simon, 2011;Regismond, Heng, Goddard, & Winnik, 1999). All materials were used without further purification.…”

Section: Methodsmentioning

confidence: 99%