TEMPO-Mediated Oxidation of Hemp Bast Holocellulose to Prepare Cellulose Nanofibrils Dispersed in Water

Puangsin, Buapan; Fujisawa, Shuji; Kuramae, Ryota; Saito, Tsuguyuki; Isogai, Akira

doi:10.1007/s10924-012-0548-9

Cited by 33 publications

(24 citation statements)

References 37 publications

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“…It occurs due to the presence of sodium hypochlorite in the system, which causes 2,3-scissions of glucose units, forming dialdehyde and dicarboxyl groups [40], which leads to further cellulose chain depolymerization. The CI of ox-TEMPO was not much influenced, which is also in agreement with the other works [33,41].…”

Section: Resultssupporting

confidence: 92%

Morphological properties of nanofibrillated cellulose produced using wet grinding as an ultimate fibrillation process

2014

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Nanofibrillated cellulose (NFC) aqueous suspensions were produced from once-dried bisulfite softwood pulp using enzymatic or 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation pretreatments, followed by wet grinding, as an ultimate fibrillation technique. Two commercial enzyme solutions: cellulase, with the major activity of endoglucanase and exoglucanase, and monocomponent endoglucanase, were compared to facilitate the nanofibrils isolation from cellulose fibers. The influence of their concentrations, as well as the other processing conditions, was analyzed. The morphology of the produced NFC was characterized using optical microscopy, atomic force microscopy (AFM), field emission gun-scanning electron microscopy (FEG-SEM), and morphological fiber analyzer (MorFi). Nanofibrils with a wide size distribution were produced. The average lateral dimensions of 12 ± 7 nm for the most disintegrated enzymatically hydrolyzed NFC and 4 ± 2 nm for TEMPO-oxidized NFC were determined from the AFM height images. The degree of polymerization (DP) decreased and the crystallinity index (CI) increased with an increase of the concentration of both enzyme solutions. TEMPO-oxidation did not have a significant impact on the cellulose CI; however, the DP was strongly affected. The monocomponent endoglucanase solution was found to have a better effect on the nanofibrils isolation rather than their depolymerization.

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Section: Resultssupporting

confidence: 92%

Morphological properties of nanofibrillated cellulose produced using wet grinding as an ultimate fibrillation process

2014

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“…A high-performance liquid chromatography system with a Shodex Asahipak NH2P-50 4E column (ψ 4.6 mm × 250 mm) and a refractive index detector (Optilab T-rEx, Shodex, Wyatt Technology, USA) was used for the sugar composition analysis; acetonitrile/ 250 mM H 3 PO 4 (3:1 v/v) was used as the mobile phase, at flow rate of 1.0 mL/min, at 30°C [20].…”

Section: Analysesmentioning

confidence: 99%

“…Scans were obtained from 2θ values of 4°to 40°and a scanning speed of 1°/min. The crystallinity index and (2 0 0) crystal size of cellulose I were calculated from the XRD patterns using conventional methods [20,26].…”

Section: Analysesmentioning

confidence: 99%

“…However, for environmental reasons, sulfur-free pulping of, and cellulose-isolation from Japanese cedar wood is necessary, because the odor of methyl mercaptan is a serious problem [17][18][19]. Puangsin et al [20] and Kuramae et al [21] used various wood and non-wood holocelluloses containing significant amounts of hemicelluloses for the preparation of TOCNs.…”

Section: Introductionmentioning

confidence: 99%

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Creation of a new material stream from Japanese cedar resources to cellulose nanofibrils

Shi

Yang

Ono

et al. 2015

Reactive and Functional Polymers

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a b s t r a c tJapanese cedar is one of the most abundant plantation softwoods in Japan, although it is not effectively utilized as a wood resource. Japanese cedar cellulose was isolated and subjected to one-pot catalytic oxidation and reduction with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and NaBH 4 , respectively. The TEMPO-oxidized and NaBH 4 -reduced Japanese cedar celluloses (TOCs-NaBH 4 ) had carboxylate content of up to 1.4 mmol/g and viscosity-average degrees of polymerization from 2000 to 3000. The X-ray diffraction patterns of the TOCsNaBH 4 showed that the crystal widths were~3 nm, indicating that the C6-OH groups present on the crystalline cellulose microfibril surfaces were selectively oxidized to C6-carboxylate groups. When the TOCs-NaBH 4 with carboxylate content of 0.9-1.4 mmol/g were mechanically disintegrated in water, transparent TEMPO-oxidized cellulose nanofibril (TOCN) dispersions were obtained. The lengths of the TOCNs, determined from their atomic force microscopy images, varied from 800 to 1500 nm, depending on the oxidation conditions. The TOCNs prepared from Japanese cedar cellulose have an average of high aspect ratios (N300), which is greater than that (~150) prepared from wood pulp and thus advantageous.

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“…Potential applications of CNF included tissue engineering , efficient catalysts , electro‐optical films , biodegradable packaging materials , nanofiber‐reinforced composites , gas‐barrier films , cosmetics , ionic capture , and other high‐technology and high‐performance materials made the exploration of CNF from different natural materials has becoming a hot research topic. CNF could be extracted from natural materials, such as wood , bamboo , pine needle , wheat straw , sugar beet , hemp , flax, potato tuber cells , banana , prickly pear fruits , lemon and maize , soybean , sisal and seaweed . Moreover, the extracting methods of CNF from these natural plants wall cell mainly concentrated on mechanical process , chemical treatment , or biological technique .…”

Section: Introductionmentioning

confidence: 99%

Natural cellulose nanofiber extracted from cell wall of bamboo leaf and its derived multifunctional aerogel

et al. 2017

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In the current research, high‐purity natural cellulose nanofiber (CNF) from bamboo leaf (BL) was successfully obtained via a combination of chemical pretreatment and ultrasonic technique. The as‐prepared CNF was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), thermogravimetric and differential thermal analysis (TGA−DTG). The as‐obtained CNF had an average diameter of 53.2 nm and a high aspect ratio of about 5600. The crystallinity of CNF was 55%, which increased by 27% compared to that of the raw BL. With further modification by methyltrimethoxysilane (MTMS), the aerogel derived from the obtained CNF through a freeze‐drying process showed superior multifunctions of superabsorbent performance, thermal insulation, and sound absorption. The study might provide a new family of nature‐based nanocellulose. POLYM. COMPOS., 39:3869–3876, 2018. © 2017 Society of Plastics Engineers

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TEMPO-Mediated Oxidation of Hemp Bast Holocellulose to Prepare Cellulose Nanofibrils Dispersed in Water

Cited by 33 publications

References 37 publications

Morphological properties of nanofibrillated cellulose produced using wet grinding as an ultimate fibrillation process

Morphological properties of nanofibrillated cellulose produced using wet grinding as an ultimate fibrillation process

Creation of a new material stream from Japanese cedar resources to cellulose nanofibrils

Natural cellulose nanofiber extracted from cell wall of bamboo leaf and its derived multifunctional aerogel

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