Stability of (1→3)-β-polyglucuronic acid under various pH and temperature conditions

Watanabe, Erika; Tamura, Naoyuki; Fujisawa, Shuji; Saito, Tsuguyuki; Habu, Naoto; Isogai, Akira

doi:10.1016/j.carbpol.2013.05.016

Cited by 4 publications

(2 citation statements)

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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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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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“…These results suggest that the removal of fines during the extraction pretreatment is favorable in order to avoid overconsumption of chemicals. It may also reduce cellulose depolymerization from limited stability of glycoside bonds at high pH and with the presence of NaClO (Watanabe et al 2013). …”

Section: Total Charge Determinationmentioning

confidence: 99%

Preparation and evaluation of high-lignin content cellulose nanofibrils from eucalyptus pulp

et al. 2018

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High Klason lignin content (23 wt%) cellulose nanofibrils (LCNF) were successfully isolated from eucalyptus pulp through catalyzed chemical oxidation, followed by high-pressure homogenization. LCNFs had a diameter of ca. 13 nm according to AFM evaluation. Dense films were obtained through vacuum filtration (nanopaper) and subjected to different drying methods. When drying under heat and mild vacuum (93°C, 95 kPa) a higher water contact angle, lower roughness and oxygen transmission rate were observed, compared to those drying at room temperature under compression conditions. DSC experiments showed difference in signals associated to T g of LCNF compared to CNF produced from spruce bleached pulp through enzymatic pre-treatment. The LCNF-based nanopaper showed mechanical properties slightly lower than for those made from cellulose nanofibrils, yet with increased hydrophobicity. In summary, the high-lignin content cellulose nanofibrils proved to be a suitable material for the production of low oxygen permeability nanopaper, with chemical composition close to native wood.

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