Contact-active antibacterial aerogels from cellulose nanofibrils

Henschen, Jonatan; Illergård, Josefin; Larsson, Per Tomas; Ek, Monica; Wågberg, Lars

doi:10.1016/j.colsurfb.2016.06.031

Cited by 39 publications

(34 citation statements)

References 40 publications

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“…The particular interest of polysaccharide-based aerogels lies in their high water sorption capacity (Mallepally, Bernard, Marin, Ward, & McHugh, 2013;Salam, Venditti, Pawlak, & El-Tahlawy, 2011), edibility, renewability, sustainability and low cost. In particular, cellulosic materials have demonstrated to be optimum for the development of aerogels with excellent mechanical properties (Gnanaseelan et al, 2018;Henschen, Illergård, Larsson, Ek, & Wågberg, 2016;Wang et al, 2016;Lin et al, 2014). Although these aerogels present promising properties, they are typically obtained by means of a complex synthesis method involving multiple steps: a first stage in which cellulose is dissolved (i.e.…”

Section: Introductionmentioning

confidence: 99%

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

et al. 2019

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This study presents the valorization of the Gelidium sesquipedale seaweed for the development of bioactive aerogels with interest in food packaging applications. The raw seaweed was used to extract cellulose, highly crystalline (Xc∼70%) and high aspect ratio (∼40) nanocellulose and an agarbased extract, rich in polyphenols and with antioxidant capacity. Subsequently, pure PVA and hybrid aerogels containing cellulose and nanocellulose were produced by a physical cross-linking method. The presence of hydroxyl groups provided by the high aspect ratio of nanocellulose promoted the interactions with water and facilitated the accessibility of moisture towards the interior of the aerogels, hence generating high water sorption capacity materials. The agar-based extract was then incorporated into selected formulations and the release in hydrophobic and hydrophilic food simulant media was investigated. Pure PVA aerogels dissolved in aqueous media, resulting in an immediate release of the bioactive. Interestingly, the hybrid aerogels containing cellulose and nanocellulose preserved their integrity and provided a more gradual release. Although the hybrid aerogels presented similar release profiles during the first 48 h, the presence of nanocellulose led to greater release values after more prolonged times. This shows the promising properties of hybrid PVA/cellulose/nanocellulose aerogels as matrices for the controlled release of bioactive compounds in food systems, which could be of interest for the development of bioactive packaging structures.

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Section: Introductionmentioning

confidence: 99%

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

et al. 2019

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“…15 Wetstable aerogels made from highly charged CNFs have been developed into advanced functional materials by applying water-based modication methods such as the layer-by-layer technique, 16 and a variety of functional aerogels have been produced, including non-leaching antibacterial sponges, highly ame-retardant materials and 3-D interdigitated batteries and supercapacitors. 9,10,17 A signicant improvement in the resistance of cellulosic materials to moisture and water can be achieved by crosslinking induced by periodate oxidation. This oxidation selectively cleaves the C2-C3 bond in the 1,4-glucan unit 18 introducing aldehyde groups that can form crosslinks through intermolecular and inter-particle hemiacetals by reacting with adjacent cellulose hydroxyls.…”

Section: Introductionmentioning

confidence: 99%

On the mechanism behind freezing-induced chemical crosslinking in ice-templated cellulose nanofibril aerogels

et al. 2018

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“…Polyvinylamine (PVAm) is a cationic polymer that is used in the paper industry to increase the strength of paper (BASF 2010). PVAm has good antibacterial properties, due to its primary amine groups, and has been used in several studies to create contact-active antibacterial cellulose using Layer-by-Layer (LbL) modification (Chen et al 2017;Henschen et al 2016;Illergård et al 2011Illergård et al , 2015Westman et al 2009). Chitosan is a cationic polysaccharide derived from naturally occurring chitin through deacetylation, and it is used in cosmetic, food and pharmaceutical products because of its antimicrobial properties (Rinaudo 2006;Sebti et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Water-stable cellulose fiber foam with antimicrobial properties for bio based low-density materials

Ottenhall

Seppänen

2018

Cellulose

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New bio-based packaging materials are highly interesting for replacing conventional fossil based products for a more sustainable society. Waterstable cellulose fiber foams have been produced in a simple one-batch foam-forming process with drying under ambient conditions. The cellulose fiber foams have a low density (33-66 kg/m 3 ) and can inhibit microbial growth; two highly valuable features for insulating packaging materials, especially in combination with stability in water. Cationic chitosan and/or polyvinylamine have been added during the foamforming process to give the foams water-stability and antimicrobial properties. The structural and mechanical properties of the cellulose fiber foams have been studied and the antimicrobial properties have been evaluated with respect to both Escherichia coli, a common model bacteria and Aspergillus brasiliensis, a sporulating mold. The cellulose foams containing chitosan had both good water-stability and good antibacterial and antifungal properties, while the foams containing PVAm did disintegrate in water and did not inhibit fungal growth when nutrients were added to the foam, showing that it is possible to produce a bio-based foam material with the desired characters. This can be an interesting low-density packaging material for protection from both mechanical and microbial damage without using any toxic compounds.

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Contact-active antibacterial aerogels from cellulose nanofibrils

Cited by 39 publications

References 40 publications

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

On the mechanism behind freezing-induced chemical crosslinking in ice-templated cellulose nanofibril aerogels

Water-stable cellulose fiber foam with antimicrobial properties for bio based low-density materials

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