The potential of TEMPO-oxidized cellulose nanofibrils as rheology modifiers in food systems

Aaen, Ragnhild; Simon, Sébastien; Brodin, Fredrik Wernersson; Syverud, Kristin

doi:10.1007/s10570-019-02448-3

Cited by 43 publications

(20 citation statements)

References 49 publications

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“…The resultant curve for neat TOCNF (Fig. 11 purple triangles) shows characteristics of shear-thinning behavior, as observed in other TOCNF suspensions (Pääkko et al 2007;Lasseuguette et al 2008;Naderi et al 2014;Aaen et al 2019). In the work performed by Lundahl et al (2018) polarized imaging con rmed that the shear behavior at rates < 100 s − 1 are caused by wall depletion, whereas at higher shear rates (i.e.…”

Section: Rheologysupporting

confidence: 55%

Mechanical enhancement of cellulose nanofibril (CNF) films through the addition of water-soluble polymers

Forti

Azrak

et al. 2021

Cellulose

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In this work, water-soluble polymers were screened through solution casting and polyvinyl alcohol (PVA) and poly(2-ethyl-2-oxazoline) (PEOX) were found as reinforcement agents for cellulose nano brils (CNFs) lms. Mechanical property increases of 99% in elastic modulus, 93% in the ultimate tensile strength (UTS) and 134% in the work of failure (WOF) were reported for TEMPO-oxidized cellulose nano brils (TOCNF) with 0.44 mmol/g carboxylate groups and 15 wt.% PVA. PEOX had a higher elastic modulus increase of 113%, yet lower UTS and WOF increases were found at 63% and 28%, respectively.Additionally, increases in UTS and elastic modulus were also seen in mechanically brillated CNF and TOCNFs with higher carboxylate contents (1.5 mmol/g). The toughening mechanism was attributed to the formation of strong hydrogen bonding between the CNFs and the hydrophilic polymers added. The presence of such mechanisms was indirectly con rmed by tensile testing, zeta potential and rheology.

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Section: Rheologysupporting

confidence: 55%

Mechanical enhancement of cellulose nanofibril (CNF) films through the addition of water-soluble polymers

Forti

Azrak

et al. 2021

Cellulose

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“…NFC has long been recognized as a valuable nanomaterial for food-related applications [11]. It has been proposed as stabilizer for food oils and foams, as an additive capable of improving the appearance and sensory properties of food and as a dietary fiber [11,[29][30][31]. More recently, scientists have started to investigate the effect of NFC materials in various aspects of the digestion process, such as the intestinal digestion and adsorption of fat [32,33], starch and milk digestion, as well as glucose and mineral adsorption [34,35].…”

Section: Resultsmentioning

confidence: 99%

In Vitro Biological Impact of Nanocellulose Fibers on Human Gut Bacteria and Gastrointestinal Cells

2020

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Wood-derived nanofibrillated cellulose (NFC) has long been recognized as a valuable nanomaterial for food-related applications. However, the safety of NFC cannot be predicted just from the chemical nature of cellulose, and there is a need to establish the effect of the nanofibers on the gastrointestinal tract, to reassure the safe use of NFC in food-related products. The present work selected the intestinal cells Caco-2 and the gut bacteria Escherichia coli and Lactobacillus reuteri to evaluate the in vitro biological response to NFC. NFC materials with different surface modifications (carboxymethylation, hydroxypropyltrimethylammonium substitution, phosphorylation and sulfoethylation) and unmodified NFC were investigated. The materials were characterized in terms of surface functional group content, fiber morphology, zeta potential and degree of crystallinity. The Caco-2 cell response to the materials was evaluated by assessing metabolic activity and cell membrane integrity. The effects of the NFC materials on the model bacteria were evaluated by measuring bacterial growth (optical density at 600 nm) and by determining colony forming units counts after NFC exposure. Results showed no sign of cytotoxicity in Caco-2 cells exposed to the NFC materials, and NFC surface functionalization did not impact the cell response. Interestingly, a bacteriostatic effect on E. coli was observed while the materials did not affect the growth of L. reuteri. The present findings are foreseen to contribute to increase the knowledge about the potential oral toxicity of NFC and, in turn, add to the development of safe NFC-based food products.

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“…Currently, there is high interest from academia and industry on technological discoveries and developments about nanocellulose, being its extraction from biomass and its possible applications in various fields commonly addressed (Phanthong et al 2018;Ribeiro et al 2019). There is a growing number of publications describing the preparation of various forms of nanocellulose such as suspensions, water-dispersible powders, films or nanopapers, hydrogels, and aerogels (Kargarzadeh et al 2018) and their applications in hybrid composite materials (Islam et al 2018), as drug delivery systems (Ching et al 2019;Li et al 2019), as food additives (Aaen et al 2019;Alzate-Arbeláez et al 2019), in biocompatible scaffolds for cell culture (Ojansivu et al 2019; and in tissue engineering (Luo et al 2019;Zhao et al 2019) among others.…”

Section: Overview Of Nanocellulose Production and Applicationsmentioning

confidence: 99%

On the toxicity of cellulose nanocrystals and nanofibrils in animal and cellular models

et al. 2020

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The need for reaching environmental sustainability encourages research on new cellulosebased materials for a broad range of applications across many sectors of industry. Cellulosic nanomaterials obtained from different sources and with different functionalization are being developed with the purpose of its use in many applications, in pure and composite forms, from consumer products to pharmaceutics and healthcare products. Based on previous knowledge about the possible adverse health effects of other nanomaterials with high aspect ratio and biopersistency in body fluids, e.g., carbon nanotubes, it is expected that the nanometric size of nanocellulose will increase its toxicity as compared to that of bulk cellulose. Several toxicological studies have been performed, in vitro or in vivo, with the aim of predicting the health effects caused by exposure to nanocellulose. Ultimately, their goal is to reduce the risk to humans associated with unintentional environmental or occupational exposure, and the design of safe nanocellulose materials to be used, e.g., as carriers for drug delivery or other biomedical applications, as in wound dressing materials. This review intends to identify the toxicological effects that are elicited by nanocelluloses produced through a topdown approach from vegetal biomass, namely, cellulose nanocrystals and nanofibrils, and relate them with the physicochemical characteristics of nanocellulose. For this purpose, the article provides: (i) a brief review of the types and applications of cellulose nanomaterials; (ii) a comprehensive review of the literature reporting their biological impact, alongside to their specific physicochemical characteristics, in order to draw conclusions about their effects on human health.Célia Ventura and Fátima Pinto have contributed equally to this work.

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The potential of TEMPO-oxidized cellulose nanofibrils as rheology modifiers in food systems

Cited by 43 publications

References 49 publications

Mechanical enhancement of cellulose nanofibril (CNF) films through the addition of water-soluble polymers

Mechanical enhancement of cellulose nanofibril (CNF) films through the addition of water-soluble polymers

In Vitro Biological Impact of Nanocellulose Fibers on Human Gut Bacteria and Gastrointestinal Cells

On the toxicity of cellulose nanocrystals and nanofibrils in animal and cellular models

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