Degradation of TEMPO-oxidized cellulose fibers and nanofibrils by crude cellulase

Homma, Ikue; Isogai, Takuya; Saito, Tsuguyuki; Isogai, Akira

doi:10.1007/s10570-013-9872-z

Cited by 23 publications

(10 citation statements)

References 32 publications

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“…The biodegradability of fibrous TOC-COOM (M: proton or metal ion) and TOCN-COOM films can be controlled on the basis of the counterions. 32 , 33 ) Cast-dried TOCN-COONa films are disrupted in water because of their highly hydrophilic properties. However, when TOCN-COONa films are soaked in aqueous CaCl 2 , MgCl 2 , AlCl 3 , and FeCl 3 solutions, followed by washing with water and drying, the obtained TOCN-COOM films have sufficient wet-strengths, depending on the metal counterions (Fig.…”

Section: Surface Modifications Of Tocns Through Ion-exchange In Watermentioning

confidence: 99%

Development of completely dispersed cellulose nanofibers

Isogai

2018

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Plant cellulose fibers of width and length ∼0.03 mm and ∼3 mm, respectively, can be completely converted to individual cellulose nanofibers of width and length ∼3 nm and ∼1 µm, respectively, by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation under aqueous conditions and subsequent gentle mechanical disintegration of the oxidized cellulose in water. The obtained TEMPO-oxidized cellulose nanofibers (TOCNs) are new bio-based, crystalline nanomaterials with applications in the high-tech and commodity product industries. Sodium carboxylate groups, which are densely, regularly, and position-selectively present on the crystalline TOCN surfaces, can be efficiently ion-exchanged with other metal and alkylammonium carboxylate groups in water to control the biodegradable/stable and hydrophilic/hydrophobic properties of the TOCNs. TOCNs are therefore promising nanomaterials that can be prepared from the abundant wood biomass resources present in Japan. Increased production and use of TOCNs would stimulate a new material stream from forestry to industries, helping to establish a sustainable society based on wood biomass resources.

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Section: Surface Modifications Of Tocns Through Ion-exchange In Watermentioning

confidence: 99%

Development of completely dispersed cellulose nanofibers

Isogai

2018

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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“…The MALLS cells and refractive index detector were kept at room temperature and 40 °C, respectively. Detailed operation and measurement conditions of the SEC-MALLS are described elsewhere (Hirota et al, 2009;Fujisawa, Isogai & Isogai, 2010;Homma, Isogai, Saito, & Isogai, 2013;Watanabe, Habu, & Isogai, 2013;Watanabe, Tamura, Fujisawa, Saito, Habu, & Isogai, 2013;Hiraoki, Fukuzumi, Ono, Saito, & Isogai, 2013;Watanabe, Tamura, Saito, Habu, & Isogai, 2014). The specific refractive index increment (dn/dc) of the AZADO-oxidized product prepared from regenerated cellulose, which was dried by freeze drying and the successive vacuum drying, was determined in a 0.1 M NaCl solution using an interferometric refractometer (Wyatt Technologies, USA), and the obtained value was 0.137 mL/g.…”

Section: Analysesmentioning

confidence: 99%

One-step preparation of 2,3,6-tricarboxy cellulose

Takaichi

Hiraoki

Inamochi

et al. 2014

Carbohydrate Polymers

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Water-soluble sodium 2,3,6-tricarboxylate cellulose (NaTCC) or sodium mesotartarate/monohydrated glyoxilate alternating co-polyacetal was prepared from regenerated cellulose in a yield of 82% by one-step oxidation with catalytic amounts of 2-azaadamantane N-oxyl (AZADO), NaBr, and excess NaOCl in water at room temperature under alkaline conditions. The AZADO-oxidized product was shown to have an almost homogeneous NaTCC chemical structure by its 1H and 13C NMR spectra. The weight- and number-average molecular masses of the obtained NaTCC were 10,700 and 7000. When AZADO-mediated oxidation was applied to softwood bleached kraft pulp, a water-soluble oxidized product was obtained. However, it had a more heterogeneous chemical structure showing that the complete oxidation of the C2, C3, and C6 hydroxyls to carboxyls is difficult to achieve in native cellulose.

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“…Similarly, comparison of the other scattering patterns, e.g. of increasing clay concentration with a fixed OCNF concentration, or increasing the OCNF concentration at a fixed clay concentration reveal no significant changes in scattering (see Supporting information, pages [19][20][21][22][23][24][25] or interactions at the measured length scales. Scattering continues to meet expectations for additive scattering for all samples tested, including mixtures of Laponite and montmorillonite.…”

Section: Plos Onementioning

confidence: 90%

“…OCNF was chosen over cellulose nanocrystals because the functionalisation method of OCNF is more environmentally benign and more atom efficient than production of CNCs [ 20 ]. Furthermore, OCNF has been shown to be biodegradable [ 22 ]. OCNF was combined with two different clays, namely Laponite and montmorillonite, to explore interactions and to understand the effect of those interactions on rheological behaviour.…”

Section: Introductionmentioning

confidence: 99%

Rheological modification of partially oxidised cellulose nanofibril gels with inorganic clays

et al. 2021

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This study aimed to quantify the influence of clays and partially oxidised cellulose nanofibrils (OCNF) on gelation as well as characterise their physical and chemical interactions. Mixtures of Laponite and montmorillonite clays with OCNF form shear-thinning gels that are more viscous across the entire shear range than OCNF on its own. Viscosity and other rheological properties can be fine-tuned using different types of clay at different concentrations (0.5–2 wt%). Laponite particles are an order of magnitude smaller than those of montmorillonite (radii of 150 Å compared to 2000 Å) and are therefore able to facilitate networking of the cellulose fibrils, resulting in stronger effects on rheological properties including greater viscosity. This work presents a mechanism for modifying rheological properties using renewable and environmentally-friendly nanocellulose and clays which could be used in a variety of industrial products including home and personal care formulations.

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Degradation of TEMPO-oxidized cellulose fibers and nanofibrils by crude cellulase

Cited by 23 publications

References 32 publications

Development of completely dispersed cellulose nanofibers

Development of completely dispersed cellulose nanofibers

One-step preparation of 2,3,6-tricarboxy cellulose

Rheological modification of partially oxidised cellulose nanofibril gels with inorganic clays

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